Shapes to remember (SDK level)

Knotwilg · **#141**

jlt · **#142**

Interesting but Black could respond with :b2:

at

.
And in fact Katago was thinking about an endgame move in the upper left quadrant.

EricBackus · **#143**

jlt · **#144**

Yes your proposition is a good move

Katago hesitated with another move, not sure which one is best.

jlt · **#145**

Position #73: White to respond to the cross-cut and find a good way to escape.

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . O O O . . | $$ | . . X O . . . . . . . . . O X O X X . | $$ | . . X O . . . . . O . . . O X X . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . X O . . . . . . . . . . . . . X . . | $$ | . X . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . O . . . . . | $$ | . . . . . . . . . . . . X . O . . . . | $$ | . . . , . . . . . , . . . . . O . . . | $$ | . . X . . . . . . . . X . X X O . . . | $$ | . . . . . . . . . . . . . . O X . . . | $$ | . . . . . . . . . . X O . . O X . . . | $$ | . . . . . . . . . . O B . . O X . . . | $$ | . . X . . . . . . . . . . . O X . . . | $$ | . . . , O . . . . , . X . . O O X . . | $$ | . . . O . . . X . . . . . X . . X . . | $$ | . . . . . . . . . . . . . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

AI's answer:

jlt · **#146**

Position #74, easy move missed again.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . . . . . . . . . X O . O . | $$ | . . . O . . . . O . . X . X . X O . . | $$ | . . O , O . . . . , O X . . . X O O . | $$ | . . X X O . . . . . O X . . . X O . O | $$ | . . . . . . . . X X X X O . O X X O O | $$ | . . . . . . . . . O O O . . . X . X O | $$ | . . X . X . . . . . . . . . . . . X O | $$ | . . . . . . . . . . . O . . . . . X X | $$ | . . . , . . . . . W O X X . . , . . . | $$ | . . O . . . . . . . X O X X . . . . . | $$ | . . . . . . . . . . . O O X . . X . . | $$ | . . . . . . . . . . . . X O X . . . . | $$ | . . O . . . . . . . . . . O . . . . . | $$ | . . . . . . . . . . . . . . O X X . . | $$ | . O . X . . . . . , . . . . O , O . . | $$ | . . X . . . X . . X . O . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer:

jlt · **#147**

Position #75, Black to play. Nothing fancy, but not at all on my radar.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . W X . . . . . . . . . . . . . | $$ | . . . O . . . . O , . . . . . X . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . O O . . | $$ | . . . . . . . . . . . . . . . O X . . | $$ | . . O O O . . . . , . . . . . , X . . | $$ | . . X X . . . . . . . . . X . X . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer

jlt · **#148**

Position #76, Black to play. Another simple shape I missed.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X , . X . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O O . . . . . , X X X X . X O . . | $$ | . . X X O O O O . . O O O O X . W . . | $$ | . . . . X X X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer:

jlt · **#149**

Position #77, Black to play.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X X X X X O . . . . . . . . . . . . | $$ | . X O O O . . . . , . . . . . X . . . | $$ | . O O . . . O . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . X . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X O . . . . . , . . . . . , . . . | $$ | . . O O . . O . . . . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

jlt · **#150**

Position #78, Black to play. From the same correspondence game against gennan. At move 144 (position below) Katago says White was leading by 1.5. In the end White won by 16.5, increasing his advantage step by step between moves 144 and 286. Black missed several important points which appear in the following position.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X O . . . X . . O X X O X . | $$ | . X X X X X O . . X O X . . O X O X . | $$ | . X O O O . . . O O O O O . . X O X . | $$ | . O O . . . O . . X O X O . O X X O . | $$ | . . X . . . . . . . O X O O X . X O . | $$ | . . . . O . . O . O X X X X X X X O . | $$ | . . . . . . X X O . O X O O X X X . . | $$ | . . O O . X . . X O . O . . O . . . . | $$ | . . . , . O X X . , O . . . . , X . . | $$ | . . O O . X O X . O X O . . . . . . . | $$ | . X X X X . . . . . X O . O . O O . . | $$ | . O . . . O . . . . . X . . . X . . . | $$ | . X X X . . . X . . X . . X . X O . . | $$ | . O X O . . O . . X . . . . . X O . . | $$ | . O X O . . . X X O . . . X O O X . . | $$ | . . O O . . O O O . . O . . X X X . . | $$ | . . . . . . . . . . . . . O . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

The first point is more complicated than it seems. Black should play :b1:

in sente.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X O . . . X . . O X X O X . | $$ | . X X X X X O . . X O X . . O X O X . | $$ | . X O O O 1 . . O O O O O . . X O X . | $$ | c O O . . 2 O . . X O X O . O X X O . | $$ | d a X b . . . . . . O X O O X . X O . | $$ | . . . . O . . O . O X X X X X X X O . | $$ | . . . . . . X X O . O X O O X X X . . | $$ | . . O O . X . . X O . O . . O . . . . | $$ | . . . , . O X X . , O . . . . , X . . | $$ | . . O O . X O X . O X O . . . . . . . | $$ | . X X X X . . . . . X O . O . O O . . | $$ | . O . . . O . . . . . X . . . X . . . |[/go]

If White doesn't answer with :w2:

then Black can play a. If White responds with c or d then Black b. The variations are a bit complicated but normally Black can threaten to capture white stones and then connect to a living group to save his three stones. So Katago prefers white to answer Black a with White b, and then Black can connect with c.

Then Black should play :b3:

in sente. If White doesn't respond with :w4:

then Black can play a.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X O . . . X . . O X X O X . | $$ | . X X X X X O . a X O X . . O X O X . | $$ | . X O O O 1 3 4 O O O O O . . X O X . | $$ | . O O . . 2 O . . X O X O . O X X O . | $$ | . . X . . . . . . . O X O O X . X O . | $$ | . . . . O . . O . O X X X X X X X O . | $$ | . . . . . . X X O . O X O O X X X . . | $$ | . . O O . X . . X O . O . . O . . . . | $$ | . . . , . O X X . , O . . . . , X . . | $$ | . . O O . X O X . O X O . . . . . . . | $$ | . X X X X . . . . . X O . O . O O . . | $$ | . O . . . O . . . . . X . . . X . . . |[/go]

Next comes this sequence:

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X O . . . X . . O X X O X . | $$ | . X X X X X O . . X O X . . O X O X . | $$ | . X O O O 1 3 4 O O O O O . . X O X . | $$ | . O O . . 2 O . . X O X O . O X X W . | $$ | . . X . . . . . . . O X O O X . X W . | $$ | . . . . O . . O . O X X X X X X X W . | $$ | . . . . . . X X O . O X O O X X X . . | $$ | . . O O . X . . X O . O . . O . . a . | $$ | . . . , . O X X . , O . . . . , X . . | $$ | . . O O . X O X . O X O . . . . . 5 . | $$ | . X X X X . . . . . X O . O . O O 6 . | $$ | . O . . . O . . . . . X . . . X 7 b . | $$ | . X X X . . . X . . X . . X . X O . . | $$ | . O X O . . O . . X . . . . . X O . . | $$ | . O X O . . . X X O . . . X O O X . . | $$ | . . O O . . O O O . . O . . X X X . . | $$ | . . . . . . . . . . . . . O . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

is very big because White playing there is sente (threatens to save the three marked stones). White responds with :w6:

(if White plays elsewhere then Black :b7:

and

is at

anyway). One reason why :w6:

is big is that, besides reducing Black's corner, it threatens the reduction move a. So after a sequence starting with a, Black will close the corner with b.

Another worthwhile and simple sequence for Black later: close territory while pressing White down to the second line in sente.

Click Here To Show Diagram Code: [go]$$Bc $$ | . X X X X . . . . . X O . O . O O O . | $$ | . O . . . O . . . . . X . . . X X X . | $$ | . X X X . . . X . . X . . X . X O . . | $$ | . O X O . . O . . X . . . . . X O . . | $$ | . O X O . . . X X O 3 7 . X O O X . . | $$ | . . O O . . O O O 4 5 O 1 . X X X . . | $$ | . . . . . . . . . . 6 8 2 O . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

gennan · **#151**

jlt wrote:

Position #78, Black to play. From the same correspondence game against gennan. At move 144 (position below) Katago says White was leading by 1.5. In the end White won by 16.5, increasing his advantage step by step between moves 144 and 286.

During this game, I was aware of what would have been black's optimal endgame in both of those situations, so I knew that black lost points there. I was also aware that white lost points around F9, but only after the fact. A recent comment of mine elsewhere was about situations like these.

Many players up to about my level (3d EGF) are not sufficiently aware how many points can still be gained or lost in the endgame and they just go through the motions of the endgame to "play the game out", sort of assuming that the score is more or less frozen in the endgame, as long as you don't make obvious mistakes. I used to be one of those people and it frustrated me to lose many games to "point-collector" type of players who would catch up to my (perceived) lead during in the endgame to "steal my win".

If you can't beat 'em, join 'em.
This also means that in live games nowadays I spend less time on the opening to save time for the later stages of the middle game and for the endgame.
That's also following advice that InSeong gave me when I was still a member of his online school.

Some other games from that OGS fast correspondence handicap tournament, where my opponent allowed me to catch up in the endgame: https://online-go.com/game/51513875, https://online-go.com/game/51513876

jlt · **#152**

Position #79, White to play an easy endgame move in the upper left quadrant.

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . X . X O O . . . . . . . | $$ | . . X X X O X . . X X . O O . O O O . | $$ | . . O O O O . . . , . . . X X X X O . | $$ | . . . . . O X X . . . X . . . . X X . | $$ | . . X . O X O . . . X . . O . X O . . | $$ | . . . . O X X X X . . O X . . . . . . | $$ | . . . X O O O O . . . O X . X . . . . | $$ | . . . . X . . . . . . . O X . X X . . | $$ | . . X O X . O . . , O . O O . O X . . | $$ | . . X X O O . . . . . . . . . O O . . | $$ | . . O O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . X . . X . . . . . | $$ | . . O . . . . . . X . . . . . . X . . | $$ | . . . . . X . O O O X X . . . . X . . | $$ | . . O O . . . . . , O . . X X X O . . | $$ | . . X . O X . O . . . . O O X O . O . | $$ | . . . X X X O . . . . . . . O O O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer

Schachus · **#153**

jlt wrote:

Position #79, White to play an easy endgame move in the upper left quadrant.

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . X . X O O . . . . . . . | $$ | . . X X X O X . . X X . O O . O O O . | $$ | . . O O O O . . . , . . . X X X X O . | $$ | . . . . . O X X . . . X . . . . X X . | $$ | . . X . O X O . . . X . . O . X O . . | $$ | . . . . O X X X X . . O X . . . . . . | $$ | . . . X O O O O . . . O X . X . . . . | $$ | . . . . X . . . . . . . O X . X X . . | $$ | . . X O X . O . . , O . O O . O X . . | $$ | . . X X O O . . . . . . . . . O O . . | $$ | . . O O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . X . . X . . . . . | $$ | . . O . . . . . . X . . . . . . X . . | $$ | . . . . . X . O O O X X . . . . X . . | $$ | . . O O . . . . . , O . . X X X O . . | $$ | . . X . O X . O . . . . O O X O . O . | $$ | . . . X X X O . . . . . . . O O O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer

how about

?

That was my first instinct…

jlt · **#154**

Your answer is not good either (not better nor worse than the wrong answer described in my previous message). Some precise counting would be necessary but here is one plausible explanation. Let's say that after B16, Black protects with B14. Then White B18 is not sente, and has no sente followup. Whereas in the correct answer B15-B14-B17, the move C18 is White's priviledge.

Note: in the correct answer, after B15-B14, Katago actually wants to play the sente sequence B3-B2-B4-A2 before returning to B17.

kvasir · **#155**

C13 looks interesting, like I'd want to play there. I think KataGo was quoted above so I could be hallucinating that this a good move.

jlt · **#156**

I use 15-block Katago and don't have a GPU, so amateur dan players occasionally find better moves especially in complex fights.

In this situation C13 is a low-policy move but once played, it agrees that it's a good move, about as good as B15. Katago wants to continue locally as follows:

Click Here To Show Diagram Code: [go]$$Wc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . X . X O O . . . . . . . | $$ | . . X X X O X . . X X . O O . O O O . | $$ | . . O O O O . . . , . . . X X X X O . | $$ | . 7 . . . O X X . . . X . . . . X X . | $$ | . 5 X . O X O . . . X . . O . X O . . | $$ | . 6 1 2 O X X X X . . O X . . . . . . | $$ | . . . X O O O O . . . O X . X . . . . | $$ | . 3 . . X . . . . . . . O X . X X . . | $$ | . 4 X O X . O . . , O . O O . O X . . | $$ | . . X X O O . . . . . . . . . O O . . | $$ | . 8 O O . . . . . . . . . . . . . . . | $$ | . 9 . . . . . . . . X . . X . . . . . | $$ | . . O . . . . . . X . . . . . . X . . | $$ | . . . . . X . O O O X X . . . . X . . | $$ | . . O O . . . . . , O . . X X X O . . | $$ | . . X . O X . O . . . . O O X O . O . | $$ | . . . X X X O . . . . . . . O O O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

However this is a bit too complex for me to understand.

jlt · **#157**

Position #80, White to play.

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . . . O . . . . . . . . . . . . . . . | $$ | . X O . O . . . . . . . . . O . X . . | $$ | . . X O . . . . . . . . . O . O X . . | $$ | . . X O . . . . . , . . O X . X . . . | $$ | . . X O . . . . . . . . O X . . . . . | $$ | . X O O . . . O . O O O X X . . . . . | $$ | X . X . . . . . . . X X O X . . . . . | $$ | . X . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . X O . O B . . | $$ | . . . . . . . . . . . X X X O X . . . | $$ | . . . . . . . . . . O O X X O . X . . | $$ | . . . . . . . . . . X X O O O O X . . | $$ | . . X . . . . . . . . . . X . . . O . | $$ | . . . , O . . . . , . . . X O O O . . | $$ | . . . O . . . . . . . . . . X X X O . | $$ | . . . . . . . . . . . . . . . . X X O | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

I hesitated between two moves

One of those moves is 4 points better than the other according to Katago. I chose the wrong one because I couldn't see some continuations of the correct answer.

Answer:

The correct answer was hane. I didn't want to play it because I thought that Black could capture the stone like this

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . . . O . . . . . . . . . . . . . . . | $$ | . X O . O . . . . . . . . . O . X . . | $$ | . . X O . . . . . . . . . O . O X . . | $$ | . . X O . . . . . , . . O X . X . . . | $$ | . . X O . . . . . . . . O X . . . . . | $$ | . X O O . . . O . O O O X X . . . . . | $$ | X . X . . . . . . . X X O X . . . . . | $$ | . X . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . 4 6 . | $$ | . . . , . . . . . , . . . . . 2 1 5 . | $$ | . . . . . . . . . . . . X O 3 O X 7 . | $$ | . . . . . . . . . . . X X X O X 8 . . | $$ | . . . . . . . . . . O O X X O . X . . | $$ | . . . . . . . . . . X X O O O O X . . | $$ | . . X . . . . . . . . . . X . . . O . | $$ | . . . , O . . . . , . . . X O O O . . | $$ | . . . O . . . . . . . . . . X X X O . | $$ | . . . . . . . . . . . . . . . . X X O | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

However I couldn't see that the following continuation was very good for White:

Click Here To Show Diagram Code: [go]$$Wcm9 $$ --------------------------------------- $$ | . . . O . . . . . . . . . . . . . . . | $$ | . X O . O . . . . . . . . . O . X . . | $$ | . . X O . . . . . . . . . O . O X . . | $$ | . . X O . . . . . , . . O X . X . . . | $$ | . . X O . . . . . . . . O X . . . . . | $$ | . X O O . . . O . O O O X X . . . . . | $$ | X . X . . . . . . . X X W X . . . . . | $$ | . X . . . . . . . . . . . . . 3 . . . | $$ | . . . . . . . . . . . . . 5 . 1 X X . | $$ | . . . , . . . . . , . . . . 2 X O O . | $$ | . . . . . . . . . . . . X O O O X O . | $$ | . . . . . . . . . . . X X X O X X 4 . | $$ | . . . . . . . . . . O O X X O . X . . | $$ | . . . . . . . . . . X X O O O O X . . | $$ | . . X . . . . . . . . . . X . . . O . | $$ | . . . , O . . . . , . . . X O O O . . | $$ | . . . O . . . . . . . . . . X X X O . | $$ | . . . . . . . . . . . . . . . . X X O | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

(The false geta :w13:

doesn't capture :b10:

but after Black captures three white stones, White gets good shape and can pull out the marked white stone.)

So Black responds to the hane like this:

Click Here To Show Diagram Code: [go]$$Wc $$ --------------------------------------- $$ | . . . O . . . . . . . . . . . . . . . | $$ | . X O . O . . . . . . . . . O . X . . | $$ | . . X O . . . . . . . . . O . O X . . | $$ | . . X O . . . . . , . . O X . X . . . | $$ | . . X O . . . . . . . . O X . . . . . | $$ | . X O O . . . O . O O O X X . . . . . | $$ | X . X . . . . . . . X X O X . . . . . | $$ | . X . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . 3 4 . | $$ | . . . , . . . . . , . . . . . . 1 2 . | $$ | . . . . . . . . . . . . X O . O X . . | $$ | . . . . . . . . . . . X X X O X . . . | $$ | . . . . . . . . . . O O X X O . X . . | $$ | . . . . . . . . . . X X O O O O X . . | $$ | . . X . . . . . . . . . . X . . . O . | $$ | . . . , O . . . . , . . . X O O O . . | $$ | . . . O . . . . . . . . . . X X X O . | $$ | . . . . . . . . . . . . . . . . X X O | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

The fight is still complicated, but this is not the point of this post. I just wanted to remind myself that stones can be sacrificed.

remotecontrol · **#158**

reminds me of this side joseki I had in a game recently.

Click Here To Show Diagram Code: [go]$$Wc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . 4 3 . . | $$ | . . . . . . . . . . . . . . . 2 1 . . | $$ | . . . . . . . . . . . . . . . 6 5 . . | $$ | . . . . . . . . . . . . . . . a X b . | $$ | . . . . . . . . . . . . . . . . 7 . . | $$ | . . . , . . . . . , . . . . . O . . . | $$ | . . . . . . . . . . . . . O . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

jlt · **#159**

Position #81, Black to play, find the next 3-4 moves. Nothing complicated, but not on my radar.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . . O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . W . . . . . . . . . . . . | $$ | . . . . . O X . . . . . . . . . . . . | $$ | . . . O O X . . . , . . . . . X . . . | $$ | . O O X X X . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . . O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . 4 . . . . . . . . . . . . | $$ | . . O . . 1 O . . . . . . . . . . . . | $$ | . . . . 2 O X 3 . . . . . . . . . . . | $$ | . . . O O X . . . , . . . . . X . . . | $$ | . O O X X X . . . . . . . a . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

After that, a simple continuation is Black a. Another possibility is

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . . O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . b . . . . . . . . . . . . . | $$ | . . . . . . 4 . . . . . . . . . . . . | $$ | . . O . 5 1 O . . . . . . . . . . . . | $$ | . . . . 2 O X 3 . . . . . . . . . . . | $$ | . . . O O X . . . , c . . . . X . . . | $$ | . O O X X X . . . . . . . . . . . . . | $$ | . 6 X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

after which Black can pull out the two stones at b, or play the extension at c and leave the two stones for the moment. The two stones can be pulled out later, or can be left as aji to be sacrificed later.

EricBackus · **#160**

jlt wrote:

Position #81, Black to play, find the next 3-4 moves. Nothing complicated, but not on my radar.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . . O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . W . . . . . . . . . . . . | $$ | . . . . . O X . . . . . . . . . . . . | $$ | . . . O O X . . . , . . . . . X . . . | $$ | . O O X X X . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

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