Life In 19x19

Problems from Jump Level Up! Vol. 1 now.

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[go]$$Bm1 1. Where to block White?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . X . . . . . . .
$$ | . . . . . O . . . . .
$$ | . . . X . . . X . X .
$$ | . . . X . O . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 2. Black to jump: A or B?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O O . . . . . .
$$ | . . O X . . . . . , .
$$ | . . O X . a b . . . .
$$ | . . O X . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 3. Black to jump: A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . O X . . . . . . . .
$$ | . O X . . . . . . . .
$$ | . O X O O . . . . . .
$$ | . . O X . O . . . , .
$$ | . O O X . a b . . . .
$$ | . O X X . c . . . . .
$$ | . X . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 4. Black to punish overplay
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O O . . . . . , .
$$ | . . X X O O . . . . .
$$ | . . . . X X Q . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 5. Black to punish overplay
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O O . . . . . , .
$$ | . X X X O O . . . . .
$$ | . . . . X X Q . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 6. Black's endgame: A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . X . . . . . . .
$$ | . X . X O . . . O . .
$$ | . . X O O . . . . . .
$$ | . X O O . . . . O . .
$$ | . X X O . . . . . , .
$$ | . c O a . . . . O . X
$$ | . . b . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 7. Endgame: Who retains sente after Black replies?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O , X . X . . , .
$$ | . O X X . . . . . X .
$$ | . O . . . . . . . . .
$$ | . . . . Q . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 8. Endgame: Who retains sente after Black replies?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O O X . X . . , .
$$ | . O X X X . . . . X .
$$ | . O . . . . . . . . .
$$ | . . . . Q . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 9. Endgame: Who retains sente after Black replies?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O O X . X . . , .
$$ | . O X X . X . . . X .
$$ | . O . . . . . . . . .
$$ | . . . . Q . . . . . .
$$ ----------------------[/go]

Bonus question!

Answers: Many of us have heard of the arranged game outcomes by professionals -- the intentional one point win, loss or draw. Shuei was no exception to this distinguished tradition, even in his early years. Below are a series of games Shuei played with Takasaki Taisaku, 'the 1-dan who played like a 3-dan.'

In 1872, Taisaku had come to Tokyo to request games from the iemoto families in an effort to earn a rank promotion. He scored favorably in his games against the Honinbo family, so Ito Showa arranged for him to have his promotion. However, Taisaku insisted on a 5-dan rank; but since it was too great a jump he was soon rejected. This became known as "Taisaku's unreasonable claim."

The reason for his request of 5-dan was because it was the rank at which one could live comfortably as a go professional in the post Castle Games/shogunate period. After his denial, he left the go world for seven years. The rest of his life can be found on the GoGoD database.

As for these games, in that 1872 period, Shuei manages to arrange one point victories for Black in all three of their games.

Game 1


Game 2


Game 3

Problems from Jump Level Up! Vol. 2 now.

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[go]$$Bm1 1. Black to punish White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O c . . . . . . .
$$ | . . b X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . . Q a . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 2. Black to punish White
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . c . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . b . . . . . . .
$$ | . . X O . . . . . O .
$$ | . . X O . . . . . . .
$$ | . a Q . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 3. Black A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . c . . . . . .
$$ | . . O b . . . . . . .
$$ | . . . X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . Q a . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 4. Black A, B, C or D?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . X . . . . .
$$ | . . . O a Q b . . , .
$$ | . . . . c X d O . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Bonus problem:

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[go]$$Bm1 5. Black A or B?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . a X . . . . .
$$ | . . . O X O O . . , .
$$ | . . . . b X . O . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 6. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . O . . . . . . . . .
$$ | O X O O O . . . . . .
$$ | . X X X O X . . . , .
$$ | X X O O X X . . . . .
$$ | X O O . O . . . . . .
$$ | . . . X . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 7. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . X . . . . . . .
$$ | . . . . O . . . . . .
$$ | . . X X X O O . O , .
$$ | . . X O O X X O . . .
$$ | . X O . O . . . . . .
$$ | . . . X . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 8. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . O . . O O . . .
$$ | . O O X X X . . . , .
$$ | . X X O O X O O X . .
$$ | . . . . O O X X . X .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Bonus problem

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[go]$$Bm1 9. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O . O . . X . .
$$ | . . O . . O X . . . .
$$ | . X X O O X X . X , .
$$ | . O O X X O O O X . .
$$ | . . . X . O . X X . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 10. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . X O O O . . . . . .
$$ | . X X O X X . . . , .
$$ | O O O X . . . . . . .
$$ | . X O X . X . . . . .
$$ | . O X X . . . . . . .
$$ ----------------------[/go]

I'll give them a try...

1. 2. 3. 4. and 5. 6. 7. 8. 9. 10. Good problems!

EricBackus wrote:Good problems!

Thank-you Eric : )

Answers: This game of Takagawa's is a good example of how he could whiz & flow around the board making exchanges, and a rare demonstration of his fighting strength.

For Problem 1

logan wrote: Answers:

$$Bm1 1. Solution 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . 4 . . . . . . . . .
$$ | . 3 O a . . . . . . .
$$ | . 2 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . 5 Q . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------

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[go]$$Bm1 1. Solution 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . 4 . . . . . . . . .
$$ | . 3 O a . . . . . . .
$$ | . 2 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . 5 Q . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

I guess that looks good, but black still has to worry about white pushing out into the middle at a. I was also worried about something like this:

EricBackus wrote:For Problem 1

logan wrote: Answers:

$$Bm1 1. Solution 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . 4 . . . . . . . . .
$$ | . 3 O a . . . . . . .
$$ | . 2 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . 5 Q . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------

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[go]$$Bm1 1. Solution 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . 4 . . . . . . . . .
$$ | . 3 O a . . . . . . .
$$ | . 2 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . . . . . . .
$$ | . . 5 Q . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

I guess that looks good, but black still has to worry about white pushing out into the middle at a.

If White captures, then Black gets to enlarge territory in the corner at the expense of White. (The territory is no longer balanced here.) Blocking with to is a fine way to play with there is a high stone or high position on the right.

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[go]$$Wm1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X 9 . . . . . . .
$$ | . O . . 5 7 . . . . .
$$ | 1 X O 3 4 6 8 . . . .
$$ | . O X X . . . . . . .
$$ | . . O X . . . . . X .
$$ | 3 . O X . . . . . . .
$$ | . 2 X O 4 . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

If White doesn't capture, then when she pushes out there a bad cutting point at A. Defending at B will allow Black to play C, A, E and establish a group on the left, or play the strong fighting move at F wherein Black's uncaptured stone will burden White. Defending at A directly will allow Black a powerful turn at G. White G won't do much better.

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[go]$$Wm1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . f . . . . . . .
$$ | . e X b . . . . . . .
$$ | . O c a 5 g . . . . .
$$ | d X O 3 4 6 . . . . .
$$ | . O X X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . 1 O X . . . . . . .
$$ | . . X O 2 . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

EricBackus wrote:I was also worried about something like this:

$$Bm1 1. White takes the bottom
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . 3 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . 4 . . . . .
$$ | . . . Q 2 . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------

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[go]$$Bm1 1. White takes the bottom
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . 3 1 X . . . . . . .
$$ | . . O X . . . . . X .
$$ | . . O X . 4 . . . . .
$$ | . . . Q 2 . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Black can break through, and gets strong on the left side. But white is out into the bottom area, which is larger than the left side. Isn't this better for white than the joseki?

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[go]$$Bm1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . X X X . . . . . . .
$$ | . . O X . . . . . Y .
$$ | 3 . O X . O . 4 . . .
$$ | . 1 2 O O . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

When looking at efficiency only White has broken shape. When looking at settled groups, only White is under attack. After to , White must make a narrow jump to , while is well-placed to continue pressuring from a variety of directions. Black's efficiency is very high and has gained a flexible position. The territory has simply switched.

It's a good example of being flexible with your territory -- not being too stuck on whose is whose; and making advantageous exchanges through natural movement of stones.

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[go]$$Bm1 1. Black A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . O . . . . .
$$ | . . b X c . . . X , .
$$ | . . a Q . O . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 2. Black A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . X . . . . . . .
$$ | . . . . . O . . . . .
$$ | . . . X . . c . X , .
$$ | . . X . b O . . . . .
$$ | . a O O . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 3. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . X X . . . . . .
$$ | . O X O . . . . . . .
$$ | . X O , . . . . . , .
$$ | . X O . O . . O . . .
$$ | . O X X O . . . . . .
$$ | . O . . . . . . . . .
$$ ----------------------[/go]

Is the book solution correct?

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[go]$$Bm1 4. Black to play
$$ -------------------
$$ | . . . . b O a . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]

Is the book solution correct?

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[go]$$Bm1 5. Black A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O . . . . . . .
$$ | . . . O . . . . . , .
$$ | . . O X c . . X . . .
$$ | . . . a b . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 6. Black's endgame
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O O O . . . , .
$$ | . . O X X O X X X . .
$$ | . . O X . X O O X . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 7. Black's endgame
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O . . . . X . . . .
$$ | . . O O O O X . . , .
$$ | . O X X X O X . . . .
$$ | . . . . . X O X . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Answers: This is certainly one of the most amazing opening fights I've seen. The shape that emerges from the bottom right is incredible. Takamiya Masaki & Cho Chikun push each others' reading to the limit in this Final of the 29th Judan title. Less than a week later it appeared in a Korean professional game, then again three days after. We can tell immediately who was studying this game and how influential it was. Things quickly go awry as Cho initiates a then considered trick play of 9 to 11. I hope you'll enjoy it as much as I did. You can find additional commentary over this game in Go World Iss. 68.

Problems from Jump Level Up! Vol. 3 now.

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[go]$$Wm1 A normal joseki begins...
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 . . . . . . . .
$$ | . 0 . . . . . . . . .
$$ | . 9 4 X 6 . . . . , .
$$ | . . 3 5 7 8 2 . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Wm11 1. Black to punish
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . 5 . . . . .
$$ | . . O . 3 4 . . . . .
$$ | . X 2 . . . . . . . .
$$ | . O X X X . . . . , .
$$ | . 1 O O O X X . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 2. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . O . O . . . .
$$ | . . O X X X O X . , .
$$ | . . O X O O X . X . .
$$ | . . . O . O X . . . .
$$ | . . . . . O X . . . .
$$ ----------------------[/go]

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[go]$$Bm1 3. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . O . . . . . . . . .
$$ | . X O O O . . . . . .
$$ | . X X X O X . . . , .
$$ | . X O O X . X . . . .
$$ | . O . O X . . . . . .
$$ | . . . O X . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 4. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | X X X X X . . . . . .
$$ | O O O X O O . . . . .
$$ | . . O O X O . . . , .
$$ | . O X X X O . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 5. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | X X X . . . . O . . .
$$ | O O O X X X . . . , .
$$ | . . O O O X O . . . .
$$ | . O X X X O . O . . .
$$ | . . . . . . O . . . .
$$ ----------------------[/go]

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[go]$$Bm1 6. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X X O O . . , .
$$ | . . X O O X . O . . .
$$ | . . . . O X X O . . .
$$ | . . . . O . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 7. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O O X X . . . , .
$$ | . O X X O . X . . . .
$$ | . . . X O O X . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 8. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O O O X X . . , .
$$ | . O X X X O X . X . .
$$ | . X O X O O O X . . .
$$ | . O . X . . . . . . .
$$ ----------------------[/go]

I really like those after Joseki problems or problems involving Josekis from Jump Level Up!. Sadly these books are not available from european shops (that I know of).

Answers: This game between between Jowa and Ansetsu (later Gen'nan) has been described by some as the "most confused fight on the go-board." Partly responsible is the strange way that the opening unfolds with both players establishing an unusually high number of strong shapes before either begins a single attack (this should be even more surprising considering who the players are!). Note the three two-space extensions, the symmetric shapes in both bottom-left and upper-right corners, and the three 3-4 point kosumis. Once White chooses to secure his top right group with move 26, Black takes no time to begin an attack on the bottom-left group -- and immediately both sides enter into the game's famously, complex fight. It's undoubtedly a game worth studying to test your fighting techniques and reading.

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[go]$$Wm26
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 1 . . |
$$ | . . X O . . . . . . . . O . O . . . . |
$$ | . . . X . . . . . , . . . X . , X . . |
$$ | . . . X . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . 5 . 6 . . . . . O . . . |
$$ | . . . X . 4 . . . . . . . . . . X . . |
$$ | . . X , . X 3 . . , . . . . O , . . . |
$$ | . . . 2 O . O . . X . . X . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

As suggested above, one of the game's interests to me is the unusual opening. It reminds me of another game nearly 170-years later between Kobayashi Koichi & Otake Hideo that took place in the seventh game of the 17th Meijin title match. Here's the position by move 22. In this game there are no less than seven two-space extensions!

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[go]$$Bm23
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . O . . O . . O . . X . . . . |
$$ | . . X , . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . O . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . O . . . . . , . . . . . , O . . |
$$ | . . X . . O . . O . X . . X . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

And the complete game record below for those interested.

Can you think of any other professional games like this? I'm sure there are many.

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[go]$$Bm1 1. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . O . . .
$$ | . X . . . . . . . . .
$$ | . O X X O . . . . , .
$$ | . O O O X X X . . . .
$$ | . . . . O O X . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 2. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . X O O . . . . , .
$$ | . . . X O X O . . . .
$$ | . . X . X O . . . . .
$$ | . . . X . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 3. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . X X . . . . . . . .
$$ | O O O X . . . . . , .
$$ | . . O X . . . . . . .
$$ | . . O X . X . . . . .
$$ | . . . O . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 4. Where to hane?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . X . . . .
$$ | . X X X X . . . . , .
$$ | a O O O O X . . . . .
$$ | . . . . b . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 5. Where to hane?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . , . . . . X , .
$$ | . X X X X X X . . . .
$$ | a O O O O O O X . . .
$$ | . . . . . . b . . . .
$$ ----------------------[/go]

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[go]$$Bm1 6. Black to punish White, A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . 3 . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 b 2 . . . . , .
$$ | . 5 4 c . . . . . . .
$$ | . a 6 . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Wm1 7. Black to punish White, A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . 7 . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . 3 . . . . . . .
$$ | . . b . . . . . . . .
$$ | . . 1 , 2 . . . . , .
$$ | . 5 4 6 . . . . c . .
$$ | . a . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Wm1 8. Black to punish White, A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . 3 . . . . . . .
$$ | . . c . . . . . . . .
$$ | . b 1 , 2 . . . . , .
$$ | . 5 4 6 . . . . . . .
$$ | . a 7 . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Bm1 9. Black to punish White, A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . 3 . . . . . . .
$$ | . 7 . . . b . . . . .
$$ | . . 1 , 2 . . . . , .
$$ | . 5 4 6 . . c . . . .
$$ | a 8 . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Answers: Problems from Jump Level Up! Vol. 4 now.

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[go]$$Bm1 1. Black to punish
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O b . . . . . . .
$$ | . . c a . 3 . . . . .
$$ | . . . X 6 1 2 . . , .
$$ | . . . 5 4 O . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Wm1 2. Black to punish
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . 5 . 3 . . . . .
$$ | . . . O . 1 2 . . , .
$$ | . . b a 4 X . . . . .
$$ | . . c . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Wm1 3. Black to punish
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . 8 7 3 . . . . .
$$ | . . . O 6 1 2 . . , .
$$ | . . . 5 4 X 9 c . . .
$$ | . . . a . . b . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 4. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . O O X X . . .
$$ | . . X X O X O O O , .
$$ | . O . O X X X . . . .
$$ | . . . O . X . O . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Bm1 5. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . X X X X . X . . .
$$ | . . X O O . . . . . .
$$ | . X O . O O . X . . .
$$ | . X O X X X O X . . .
$$ | . X O O O . O X . , .
$$ | . . X X . O O X . . .
$$ | . . . . X X X . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Bonus question (look after completing problem six):

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[go]$$Bm1 6. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X X X . . . . .
$$ | . X . O O X . . . . .
$$ | . X O , O . X . . , .
$$ | . X O X . O . X . . .
$$ | . X O X O O X . . . .
$$ | . . O X . O . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 7. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . O O O O O O O O O .
$$ | . O X X X X X X X O .
$$ | . X . . O O . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Bm1 8. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . O . . . . . .
$$ | . . O X O . . . . . .
$$ | . O X . X O . . . . .
$$ | . O X , X O . O . , .
$$ | . O X O X X O . . . .
$$ | . O X O . X O . . . .
$$ | . . . . . X O . . . .
$$ ----------------------[/go]

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[go]$$Bm1 9. Black's endgame
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . X X X O O . , .
$$ | . . . X O O . . O . .
$$ | . . X O O . . . . . .
$$ | . . X . . . . . . . .
$$ ----------------------[/go]

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[go]$$Bm1 10. Black's endgame
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . X . . . . . .
$$ | . . . . . O . . . . .
$$ | . . . X X X O O . , .
$$ | . . X . O O . . . O .
$$ | . . X O . . . . . . .
$$ | . . X . . . . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Bm1 11. Black's endgame, A, B or C?
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . X . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . , O . . O . , .
$$ | . X . O . . . . . O .
$$ | . . X . b . . . . . .
$$ | . . . . a c . . . . .
$$ ----------------------[/go]

Answers:In this post I would like to talk about a particular shape which can be given under the proverb two hanes gain a liberty and partly covered in Jump Level Up! Vol. 4.

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[go]$$Bm1 1. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . X X X . X . X . . .
$$ | . O . . O . . . . . .
$$ | . O X X O O X X O , .
$$ | . . O O X X O O . O .
$$ | . O . a . . b . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

If Black can gain A & B in sente, then he can increase his liberties by one. (Thus winning the capturing race in this example.)

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[go]$$Bm1 2. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . X X X . X . X . . .
$$ | . O . . O . . . . . .
$$ | . O X X O O X X O , .
$$ | . . O O X X O O O . .
$$ | . O . a . . b . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

If Black can only gain A in sente, then White can make a ko.

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[go]$$Bm1 3. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . X X X . X . X . . .
$$ | . O . . O . . . . . .
$$ | . O X X O O X X O , .
$$ | . O O O X X O O O . .
$$ | . . . a . . b . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

And if Black cannot gain either A or B in sente, then White can kill Black with a famous tesuji. (Known as the yellow oriole captures the butterfly (黄莺扑蝶) or the tanuki drums his belly (狸の腹鼓))
Shape 1 examples:

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[go]$$Bm1 4. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . X X X . . . .
$$ | . . . X . O . X X . .
$$ | . O O X . O . . . O .
$$ | . O X X O O O X X O .
$$ | . . O O X X X O O . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Click Here To Show Diagram Code

[go]$$Bm1 5. Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . X . . . . .
$$ | . . X X . . X . . . .
$$ | . X . . O O X O . . .
$$ | O O X X O X O . . , .
$$ | . . O O X X O . O . .
$$ | . O . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Bonus question: Shape 2 examples:

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[go]$$Wm1 7. White to play (Hayashi Shuei v. Kobayashi Tetsujiro, 1876-09-13)
$$ ---------------------------------------
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O X . X . . . . 0 . . 8 9 . . . |
$$ | . . O X O X . . . . O 7 4 6 O O X . . |
$$ | . . . , O X . . . , . . 5 O X , X . . |
$$ | . . . O . . . . . . . X . . X . X . . |
$$ | . . . O X . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . X . . X . . . . . |
$$ | . . O . X . X . O O O X X O O . . . . |
$$ | . . O X . 3 . . . O X O O X . O . . . |
$$ | . O X , O . O O O X X O X . . O . . . |
$$ | . . X . O 1 O X X X O O . X X O . . . |
$$ | . . . . O X X . . X O . . . O X O . . |
$$ | . . X X O X O 2 X X . O . O . X O . . |
$$ | . . . . O O X X O . X O . . O X X O . |
$$ | . . . X O X . X O . X . . . O X . O . |
$$ | . . X , O X . X O , O O O . X , . . . |
$$ | . . . . O . X . O O X X X X . X . . . |
$$ | . . X X O . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Bonus question:

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[go]$$Bm1 9. Black to play (Kim Suchang v. Yu Changhyeok, 1992-02-08)
$$ ---------------------------------------
$$ | . X . . . . . O . O X O . X X . O . . |
$$ | X . X . . . . O O X . X . O X O . O . |
$$ | . X O O . O O X X X X O . O X X O . . |
$$ | . X X O O . X O X O . X X O . X O . . |
$$ | O X X X O . X O X X . . . O X O X . . |
$$ | . O X O O . . O O X . . . . . O X . . |
$$ | . O O X X X X . O . X . . O . O X . . |
$$ | . . X O O O . X O O X O . . . X X . . |
$$ | . . X O X . . O X O X O . . X . . . . |
$$ | . . O , . . . . X O X . . X . , O O . |
$$ | . . O . . . . . . O X . X . X O O X . |
$$ | . . . O . 6 . . . . O . . . . O X . . |
$$ | . O X O X 4 5 . . . O . O . . O X . . |
$$ | . O X O X O 3 . O . . . . . . O O X . |
$$ | . O X O X O X 1 2 . . O . . . . X X . |
$$ | . X O O O X O 7 O X . . . X X X . O . |
$$ | X . X O X X O 8 9 X . . . . O X O . . |
$$ | . X X X X O . . 0 . . . . . X . X O . |
$$ | . . . . . . . . . . . . . . . X . X . |
$$ ---------------------------------------[/go]

Shape 3 examples:

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[go]$$Wm1 10. White to play (Honinbo Satsugen v. Inoue Shuntatsu Inseki, 1773-12-30)
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . O . . X . . . . . . . . . |
$$ | . X O O . . . X X O X X X . X X X . . |
$$ | . . X , O . O X O O . O . . . O X O . |
$$ | . X . X X X O O X O . . . . . . . . . |
$$ | . . O . . . O . X O . . X . . . O . . |
$$ | . . . . . O . . X . O O X . . O . . . |
$$ | . . X . . . O X X X O X X . X O . . . |
$$ | . . . . . . O O X O O X . O . X O . . |
$$ | . . . , . . O O O X X O . . . X O . . |
$$ | . . . . . . X O O X . O . . . X . . . |
$$ | . . O . . X . X X X O . . . . . X . . |
$$ | . . . . . 8 O . . X . . . . . . . . . |
$$ | . . . X . X O O O X . . . . . . . . . |
$$ | . . X O X 0 X 1 X O . O . . . . O . . |
$$ | . . O O . 9 2 3 X O . . . O . O . O . |
$$ | . . . O . 7 5 4 X O . . X X X X O X . |
$$ | . . . . . . 6 . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Click Here To Show Diagram Code

[go]$$Wm1 11. Black to play (ad lib. An Choyeong v. Chen Yaoye, 2006-02-09)
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . . X O . . . . O . X . . . X . . . . |
$$ | . . X , O . . . . , . . . . . , X . . |
$$ | . . X O . . . . O . X . . . . . . . . |
$$ | . . X O . . . . . . . . . . . . . . . |
$$ | . X X O . . . . . . . . . . . . . . . |
$$ | . O O X X . O . . . . . . . . . . . . |
$$ | . O X . . . O X . . . . . . . . . . . |
$$ | . . O , X O O X . , . . . . . , . . . |
$$ | . . . O O X X O O O O O O . O . . . . |
$$ | . . O X X X O X X X X X X X . . O . . |
$$ | . . O X X X O . X X X O . . . . . . . |
$$ | . . O O X O . O O X O . O . . O X X . |
$$ | . X X X X O O . O X O O . . . O . . . |
$$ | . . . X X X O X O O X . O . . O X . . |
$$ | . . . X X O O X X X X . O X . O X . . |
$$ | . . . . . . . 1 . . . . . . . O X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]