Home > Steve > Go > Problem of the month
Two problems from a Japanese magazine, neither are particularly hard if you are methodical.
They key to this is to count the liberties now and determine how they will be after Black andafter White's reply.
There are two obvious Black moves, the two ataris. The 3-3 point atari fails since after white connects, white has 3 liberties to Black's 2. I'm not doing a diagram for this as you need to be able to metally visualise this.
The other atari, on the 2-4 point is more promising. It leaves the right black stones with 3 liberties and the corner white stones also with 3 liberties - so the question becomes can Black keep reducing White to 2 liberties?
This is a typical sequence. Black can keep white's liberties down. Black 3 is a key move which might easily be missed, White 3' at 4. Also Black 5' at 10 fails. Both are another exercise for the reader.
Black is trying to kill white here. White has two weaknesses - the stone in pre-atari on the left and the fact that the lower string has no external liberties. Black on the other hand has two stones in pre-atari and in poor shape.
If White is permitted to atari the two stones - sente since the capture would be a second eye - he gets the time to finsh a second eye on the left. Black's correct move is just to remove his own weakness and White is left stumped.
Black 3 is a common tesuji. Compare this with the killing sequence in the "J-group" in the corner.
Problem of the month
British Go Association
Last updated 2004-08-10
This page is part of http://www.stocton.org/