1 dan game from ogs

wossname · Post by **wossname** » Fri Aug 20, 2010 7:47 am

i was thinking of reviewing a game, but it seems traffic is pretty slow in this forum! so instead, here's a game of mine open for comments. i'm white

Harleqin · Post by **Harleqin** » Fri Aug 20, 2010 8:35 am

misses the chance to break the ladder first (with the atari), before playing in the corner. Comparison with the known sequence starting with H3 instead of G3 shows that this is better for White.

Harleqin · Post by **Harleqin** » Fri Aug 20, 2010 8:41 am

:w132: at R9 simply captures the two black stones.

wossname · Post by **wossname** » Fri Aug 20, 2010 8:50 am

Harleqin wrote::w132: at R9 simply captures the two black stones.

i think i convinced myself that black r11 threatened issues with the capture race in top right, so i wouldn't have had time to follow through with the threat of R9 to separate the black stones. that's why i chose to take the sente squeeze instead. i may have been wrong!

Harleqin · Post by **Harleqin** » Fri Aug 20, 2010 10:44 am

wossname wrote:
Harleqin wrote::w132: at R9 simply captures the two black stones.

I think I convinced myself that black R11 threatened issues with the capture race in top right, so I wouldn't have had time to follow through with the threat of R9 to separate the black stones. That's why I chose to take the sente squeeze instead. I may have been wrong!

Since the black group in that capturing race has no outside liberties, but there are a lot of shared liberties, Black can at most hope for a seki. All you have to worry about is that black R11 cannot create life or connect after you cut at S9; then the hypothetical seki would collapse in your favour.

Post by **Joaz Banbeck** » Fri Aug 20, 2010 1:03 pm

I like 40 at D17. The corner then looks a lot healthier.

hyperpape · Post by **hyperpape** » Fri Aug 20, 2010 1:29 pm

I'm weaker than you are, so grains of salt and all, but:

I thought 72 seemed suspect--you're pushing from behind when you could jump ahead with a knight's move. And it seems like just jumping then will give you more valuable followups if B takes sente.

Harleqin · Post by **Harleqin** » Fri Aug 20, 2010 3:17 pm

should simply jump to E14, and :w40:

should atari at B16 first.

Post by **Joaz Banbeck** » Fri Aug 20, 2010 5:21 pm

Harleqin wrote:... should atari at B16 first.

That was my first reaction, but it looks like white is behind in ko threats.

Harleqin · Post by **Harleqin** » Fri Aug 20, 2010 8:10 pm

Joaz Banbeck wrote:
Harleqin wrote:... should atari at B16 first.

That was my first reaction, but it looks like white is behind in ko threats.

It is much better than to start the ko as in the game. Even if after a black threat/answer/retake you have to pull back to D17 instead of making a threat, it is still better than submitting directly.

Post by **Joaz Banbeck** » Fri Aug 20, 2010 10:26 pm

Harleqin wrote:
Joaz Banbeck wrote:
Harleqin wrote:... should atari at B16 first.

That was my first reaction, but it looks like white is behind in ko threats.

It is much better than to start the ko as in the game. Even if after a black threat/answer/retake you have to pull back to D17 instead of making a threat, it is still better than submitting directly.

It seems that - given that white cannot win a ko - we are discussing the following two positions:

Click Here To Show Diagram Code: [go]$$W B17 first, D17 later $$|------------------ $$| . . . . . . . . . $$| . 5 . . . . . . . $$| . 4 O 3 . O . . . $$| 6 1 X O . . . . . $$| . 2 . X . . . . . $$| . . X . . . . . . $$| . . . . . . . . . $$| . . . . . . . . . $$| . . . . . . . . .[/go]

Click Here To Show Diagram Code: [go]$$W D17 first $$|------------------ $$| . . . . . . . . . $$| . 3 . . . . . . . $$| . 2 O 1 . O . . . $$| . 4 X O . . . . . $$| . . . X . . . . . $$| . . X . . . . . . $$| . . . . . . . . . $$| . . . . . . . . . $$| . . . . . . . . .[/go]

IMHO, black looks better in the first diagram.

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1 dan game from ogs

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