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BQM31
This happened in a game of mine. I am White. Please review.
White had played the double approach to the star point. Kogo's Joseki Dictionary says that Black should get out with the kosumi (on the other hand, actual practice says...BQM31 Modern Double Kakari). However, he attached (tsuke). At move 5 I expected him to play at 7, because if White then cuts, Black sacrifices 1 and 3 and walks along the fourth line. To my surprise he played KosumiTsuke and, applying my BasicInstinct, I played nobi. He then blocked the corner, leaving a very tempting CuttingPoint. As so often, I muttered "must ... resist ... temptation" (c) Dilbert, but I fell for it and played the cut. Let me first show the alternative I had in mind.
White 1 reinforces the group and protects against the cut. Black must come back to protect against his cut, and then White plays on the other side. One cannot deny that the Black group has awkward shape but OTOH for having played twice in a row and Black playing what seemed to be a bad move (5 in first diagram), I felt this variation to be too soft.
WAR, o-u-o-u-o-u-oh, what is it good for ? (Absolutely nothing).
Black took some time to play 8, which indeed seems to me the strongest move.
This was the alternative for Black 8 in the previous diagram. Now White is faced with a soft option 'b' and an agressive one 'a', which again seems best.
Making ko in the corner was a very attractive prospect.
Black 1 and White for were intended to be local ko-threats.
White 3 solved the ko with relatively good aji and Black's influence seems inferior (but not much) to White's 30-points corner.
Still, White will soon have to capture the cutting stones, otherwise Black makes either small life in the corner like in this diagram or ...
... turns the corner into an approach ko. DaveSigaty: I think there is no ko here. B can not make an eye in the corner and can not squeeze W effectively enough on both the top and the right to prevent W from capturing the B stones in time.
DaveSigaty: I am wondering what about White playing at 1 here instead of using 3 as a ko threat? After 5, W 7 looks like just the right spot (if B 'a' then W 'b' and if B 'b', W 'a' follows). Despite 2 and 4 it does not look like B can attack the right side W stones very effectively while the capture at 'c' remains. If B 'd', W 'e' looks good enough and if B 'e' then W can cut across at 'd'. If B plays on the left after 5 then I think he will find it difficult to find an effective ko threat when W uses 7 to retake the ko. Allways one should seek the most simple variation. Reading this page I felt the need to add it myself. Usualy simple is best, there is no need to think complicate unless the simple things don't work. So...
White is afraid of the cut with black 4 because now he doesn't have anymore a liberty at 1. But still black cannot cut with 4. All white has to do is play hane with 5 and connect. Now if black defends the corner white captures with 'a'. Or if black defends 4 white plays 'b'. This is the same with the first diagram of Mr. Holgor. He added a few more moves and I have to say white is definitely better in that diagram. His teritory is better than the black influence. And more, he is sente, even if the ladder works for black white can always play a shicho-atari (ladder breaker).
The only problem seems to be the black move at 8. But now white plays atari at 9 and still has 'a' and 'b'. The idea in this position is that the black corner is to weak to attack white. And that white should not play atari on stone 4 until he knows which atari to play. Lucretiu Calota 5 dan from Romania This is a copy of the living page "BQM31" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |