BQM 388

    Keywords: Question

I tried to make a problem on from a pro game by Yamashiro Hiroshi-Takemiya Masaki (Honinbo 1987), but some clever solvers pointed out a bad white move. I just assumed 9Ps would make correct moves, so I didn't check alternative white moves.

Move 150  

In the game white played W1, which eventually led to seki in the corner. But what if white had played the marked point instead?

My version of the problem only showed the corner and not all the cutting points in the upper middle, but even with these I can't figure out how black could make something of value, if white played the marked move.

Did Yamashiro Hiroshi a mistake?

Failed attempt  

Author: ekberg

unkx80: I think yes, Yamashiro Hiroshi made a mistake.


I think the best endgame sequence in this area should be like this. After W2, B3 is tesuji that allows Black to atari at a. Later, B7 to B9 can get another couple of points in gote, but nothing nearly as large as turning the entire corner into seki, I suppose.

BQM 388 last edited by Unkx80 on November 23, 2007 - 04:40
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