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A different approach this month. Here we have two silimar situations, with most of the outside stones alive. White can obviously easily capture the cutting stones. Which diagram would you rather play Black in?
In both situations, the 4 white stones have three liberties and the 2 black ones have only two. So unless Black can do something special, he'll lose this.
Let's start by looking at Dia 1 where the edge is more open.
After Dia 3, Black sacrifices one of 1 or 3 to gain the tempo to capture the white stones. Eg Dia 4.
So as far as it goes, there appears to be no relative benefit in either situation for Black. He wins in both with first play.
Instead of blocking the hane of 1 with 2' at 3, the first line play of 2 - peeping towards 5 - is a tesuji.
Whatever Black does, he can never get his liberties up above 2.
This tesuji doesn't work in Dia 2 since the hane is also an atari. Thus Black would prefer to play in Dia 2, even though Dia 1 has more apparent space.
Problem of the month
British Go Association
Last updated 2004-08-10
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