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Offline Kirby
 Post subject: L19 Go Problem Championship: Round 4
Post #1 Posted: Thu Mar 09, 2017 11:57 pm 
Honinbo

Posts: 9550
Liked others: 1602
Was liked: 1712
KGS: Kirby
Tygem: 커비라고해
Welcome to Round 4 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . . . |
$$ . . . O X . X O . |
$$ . . O . O X X . . |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]




Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . . . |
$$ . . . X O . . . . |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]





Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O . . X . .
$$ | . X O . . . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



Have fun! :salute:

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Offline EdLee
 Post subject:
Post #2 Posted: Fri Mar 10, 2017 2:50 am 
Honinbo
User avatar

Posts: 8859
Location: Santa Barbara, CA
Liked others: 349
Was liked: 2076
GD Posts: 312
2017 Round 4.1 (010)
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ . . . . . X . . . |
$$ . . . O X . X O . |
$$ . . O . O X X . . |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
At first I thought it was W to play. :)
Click Here To Show Diagram Code
[go]$$W
$$ ------------------
$$ . . . . . X . . . |
$$ . . . O X . X O . |
$$ . . O . O X X 1 . |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B B dies
$$ -------------------
$$ . . . . . X 5 . 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O 6 |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B ko
$$ -------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
2017 Round 4.2 (011)
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . . . |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B :w2: @ (a) or (b) ; W dies
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O a b 1 . |
$$ . . . X O X O O 3 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B :w2: in 1st line grey area ; squeeze
$$ --------------------
$$ . . . X ? ? ? ? ? |
$$ . . . X O . 3 1 . |
$$ . . . X O X O O ? |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

Click Here To Show Diagram Code
[go]$$B B kills only half, in sente ; hmm...
$$ --------------------
$$ . . . X . 5 . 6 . |
$$ . . . X O 3 4 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O 4 3 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B W lives
$$ --------------------
$$ . . . X . 6 . 5 . |
$$ . . . X O O X X O |
$$ . . . X O . O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . . 1 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
2017 Round 4.3 (012)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O . . X . .
$$ | . X O . . . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$B W lives...
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 2 . X . .
$$ | . X O . . 1 . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O 0 8 3 4 . X .
$$ | . . 9 7 O 6 5 . X .
$$ ---------------------[/go]

Click Here To Show Diagram Code
[go]$$Bm11
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 1 O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O O O X O . X .
$$ | . 2 X X O O X . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$Bm13 :b2: W dies...
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . X O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O O O X O . X .
$$ | . O 1 . O O X . X .
$$ ---------------------[/go]
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Offline gamesorry
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #3 Posted: Sat Mar 11, 2017 4:39 pm 
Lives with ko

Posts: 149
Liked others: 276
Was liked: 49
Rank: 3d
KGS: 3d
DGS: 3d
OGS: 3d
1. Ko
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]


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


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


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


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


Variation: B fails
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X 1 2 3 . . |
$$ . . . X O 4 . 5 . |
$$ . . . X O X O O 6 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


3.

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


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


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


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


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


Seki, B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 9 O . O X . ,
$$ | . X O a O 1 2 X . .
$$ | . X O . b 3 4 . X .
$$ | . c 7 8 O 5 6 . X .
$$ ---------------------[/go]


B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 7 O . O X . ,
$$ | . X O 8 O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . 5 6 O . . . X .
$$ ---------------------[/go]


B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . 8 7 O 5 6 . X .
$$ ---------------------[/go]


After B5, W8 fails

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


However, W8 has strong resistance:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . . 7 O 6 5 8 X .
$$ ---------------------[/go]


(Cont'd) B fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O . 1 X O . X .
$$ | . . 2 X O O . O X .
$$ ---------------------[/go]


(Cont'd) W has a and b miai, B fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . a O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O 2 . X O b X .
$$ | . . 1 X O O . O X .
$$ ---------------------[/go]


B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O 6 O 2 . X . .
$$ | . X O 5 3 1 4 . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 2 . X . .
$$ | . X O . 4 1 3 . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]


B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O . O . . X . .
$$ | . X O 1 2 . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 1 O . O X . ,
$$ | . X O 3 O 2 . X . .
$$ | . X O 4 . . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]
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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #4 Posted: Sat Mar 11, 2017 5:52 pm 
Tengen

Posts: 4382
Location: Caldas da Rainha, Portugal
Liked others: 499
Was liked: 733
Rank: AGA 3k
GD Posts: 65
OGS: Hyperpape 4k
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]

Ko.

Well, here's a move that doesn't work!

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


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


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


I think this works.
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . 5 . . . |
$$ . . . X O 3 4 1 . |
$$ . . . X O X O O 2 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


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

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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #5 Posted: Tue Mar 14, 2017 5:14 pm 
Lives in sente
User avatar

Posts: 1206
Liked others: 51
Was liked: 192
Rank: KGS 5d
KGS: Str1fe, Midorisuke
Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]




Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . 4 . . . |
$$ . . . X O 3 . 2 1 |
$$ . . . X O X O O 5 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]





Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . . 5 O . . . X .
$$ ---------------------[/go]
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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #6 Posted: Tue Mar 14, 2017 10:08 pm 
Honinbo

Posts: 9550
Liked others: 1602
Was liked: 1712
KGS: Kirby
Tygem: 커비라고해
@EdLee:
Quote:
Looks like you are still studying for the last two problems. Did you want any comments?

I don't always check the edits, so let me know if you make an update and want feedback before Friday.

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #7 Posted: Tue Mar 14, 2017 10:08 pm 
Honinbo

Posts: 9550
Liked others: 1602
Was liked: 1712
KGS: Kirby
Tygem: 커비라고해
gamesorry wrote:
1. Ko
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]


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


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


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


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


Variation: B fails
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X 1 2 3 . . |
$$ . . . X O 4 . 5 . |
$$ . . . X O X O O 6 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


3.

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


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


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


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


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


Seki, B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 9 O . O X . ,
$$ | . X O a O 1 2 X . .
$$ | . X O . b 3 4 . X .
$$ | . c 7 8 O 5 6 . X .
$$ ---------------------[/go]


B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 7 O . O X . ,
$$ | . X O 8 O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . 5 6 O . . . X .
$$ ---------------------[/go]


B5 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . 8 7 O 5 6 . X .
$$ ---------------------[/go]


After B5, W8 fails

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


However, W8 has strong resistance:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . . 7 O 6 5 8 X .
$$ ---------------------[/go]


(Cont'd) B fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O . 1 X O . X .
$$ | . . 2 X O O . O X .
$$ ---------------------[/go]


(Cont'd) W has a and b miai, B fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . a O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O 2 . X O b X .
$$ | . . 1 X O O . O X .
$$ ---------------------[/go]


B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O 6 O 2 . X . .
$$ | . X O 5 3 1 4 . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 2 . X . .
$$ | . X O . 4 1 3 . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]


B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . . O . O X . ,
$$ | . X O . O . . X . .
$$ | . X O 1 2 . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



B1 fails
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 1 O . O X . ,
$$ | . X O 3 O 2 . X . .
$$ | . X O 4 . . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]



@gamesorry:
Looks good. Kudos to your thorough variations!

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #8 Posted: Tue Mar 14, 2017 10:14 pm 
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hyperpape wrote:
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]

Ko.

Well, here's a move that doesn't work!

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


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


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


I think this works.
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . 5 . . . |
$$ . . . X O 3 4 1 . |
$$ . . . X O X O O 2 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


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


@hyperpape:
Problem 1 looks good.

For problem 2, did you consider this move?

Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . . . |
$$ . . . X O . . 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #9 Posted: Tue Mar 14, 2017 10:18 pm 
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Shaddy wrote:
Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]




Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . 4 . . . |
$$ . . . X O 3 . 2 1 |
$$ . . . X O X O O 5 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]





Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . . 5 O . . . X .
$$ ---------------------[/go]



@Shaddy:
Problems 1 and 3 look good. For Problem 2, did you consider if white responds in this way?
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . . . |
$$ . . . X O 2 . . 1 |
$$ . . . X O C O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

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Offline EdLee
 Post subject:
Post #10 Posted: Wed Mar 15, 2017 1:07 am 
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Hi Kirby, I appreciate any tips or comments. :) Thanks.
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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #11 Posted: Wed Mar 15, 2017 2:10 am 
Lives in sente
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@Kirby

I didn't. Please mark me wrong on that one - thanks!
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Offline Kirby
 Post subject: Re:
Post #12 Posted: Wed Mar 15, 2017 7:43 am 
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EdLee wrote:
2017 Round 4.1 (010)
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ . . . . . X . . . |
$$ . . . O X . X O . |
$$ . . O . O X X . . |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
At first I thought it was W to play. :)
Click Here To Show Diagram Code
[go]$$W
$$ ------------------
$$ . . . . . X . . . |
$$ . . . O X . X O . |
$$ . . O . O X X 1 . |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B B dies
$$ -------------------
$$ . . . . . X 5 . 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O 6 |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B ko
$$ -------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
2017 Round 4.2 (011)
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . . . |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B :w2: @ (a) or (b) ; W dies
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O a b 1 . |
$$ . . . X O X O O 3 |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B :w2: in 1st line grey area ; squeeze
$$ --------------------
$$ . . . X ? ? ? ? ? |
$$ . . . X O . 3 1 . |
$$ . . . X O X O O ? |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

Click Here To Show Diagram Code
[go]$$B B kills only half, in sente ; hmm...
$$ --------------------
$$ . . . X . 5 . 6 . |
$$ . . . X O 3 4 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O 4 3 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B W lives
$$ --------------------
$$ . . . X . 6 . 5 . |
$$ . . . X O O X X O |
$$ . . . X O . O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O . . . 1 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]
2017 Round 4.3 (012)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O . . X . .
$$ | . X O . . . . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$B W lives...
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 2 . X . .
$$ | . X O . . 1 . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O 0 8 3 4 . X .
$$ | . . 9 7 O 6 5 . X .
$$ ---------------------[/go]

Click Here To Show Diagram Code
[go]$$Bm11
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 1 O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O O O X O . X .
$$ | . 2 X X O O X . X .
$$ ---------------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$Bm13 :b2: W dies...
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . X O . O X . ,
$$ | . X O . O X O X . .
$$ | . X O O O X O . X .
$$ | . O 1 . O O X . X .
$$ ---------------------[/go]


@EdLee:
Problem 1 looks good.

Problem 2 looks to be on the right track. Did you consider this variation?
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . X . . . . . |
$$ . . . X O 2 . . 1 |
$$ . . . X O C O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


For Problem 3, did you consider this option?
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . . 3 4 . X .
$$ | . . . 7 O 6 5 8 X .
$$ ---------------------[/go]

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #13 Posted: Wed Mar 15, 2017 7:45 am 
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Shaddy wrote:
@Kirby

I didn't. Please mark me wrong on that one - thanks!


@Shaddy:
It's your call if you want to make an update. FWIW, you are very close.

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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #14 Posted: Wed Mar 15, 2017 8:47 am 
Tengen

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Kirby wrote:
For problem 2, did you consider this move?
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . . . |
$$ . . . X O . . 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


Not sure, but it transposes, right?
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . 5 . |
$$ . . . X O 4 3 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #15 Posted: Wed Mar 15, 2017 8:52 am 
Tengen

Posts: 4382
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Problem 3:
Two moves jump out at me. I thought both failed, but now I'm unsure about the second. I'll have to review my attempt when I have more time.

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O b . X . .
$$ | . X O . . a . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]


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


Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 0 O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . 8 3 4 . X .
$$ | . . 9 7 O 6 5 . X .
$$ ---------------------[/go]

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #16 Posted: Wed Mar 15, 2017 9:08 am 
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hyperpape wrote:
Kirby wrote:
For problem 2, did you consider this move?
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . . . |
$$ . . . X O . . 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


Not sure, but it transposes, right?
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . X . . . 5 . |
$$ . . . X O 4 3 1 2 |
$$ . . . X O X O O . |
$$ . . X . O O X O X |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]


@hyperpape:

Is white alive or dead?

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #17 Posted: Wed Mar 15, 2017 9:18 am 
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hyperpape wrote:
Problem 3:
Two moves jump out at me. I thought both failed, but now I'm unsure about the second. I'll have to review my attempt when I have more time.

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . , O . O X . ,
$$ | . X O . O b . X . .
$$ | . X O . . a . . X .
$$ | . . . . O . . . X .
$$ ---------------------[/go]


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


Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | . . . . X X X X . .
$$ | . . X X O O O X . .
$$ | . X . 0 O . O X . ,
$$ | . X O . O 1 2 X . .
$$ | . X O . 8 3 4 . X .
$$ | . . 9 7 O 6 5 . X .
$$ ---------------------[/go]



@hyperpape:
You are pretty close.

Did you consider this?

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

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #18 Posted: Fri Mar 17, 2017 11:42 pm 
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Solutions and the next round will be postponed until this weekend. I had some personal business today to attend to.

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Offline mongus
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #19 Posted: Sat Mar 18, 2017 4:55 am 
Dies with sente

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Rank: 12kyu
Cool, maybe I can get one in just in time!


I can only find a solution that ends in Ko. Anything else baffles me!


Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ . . . . . X . 5 4 |
$$ . . . O X . X O 3 |
$$ . . O . O X X 1 2 |
$$ . . . O O , O O . |
$$ . . . . . O . . . |
$$ . . . . . . . . . |[/go]
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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 4
Post #20 Posted: Sun Mar 19, 2017 12:42 pm 
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@mongus:
Looks good!

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