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End Game Test One Solution 4
Difficulty: Dan level
Keywords: Problem, EndGame
Solution for "The Practical Endgame Test One"
In the solution black plays at 'a'. What if B plays at 1 in this diagram instead?
If W plays 1 here she only wins by 3 points and not by 4 points as in the solution.
If W plays 3 here black answers calmy at 4. W cannot block at 6 now, as she would be two points worse off than if she had played at 4 immediatly (instead of 3). So black plays 6 - the sequence unfolds unto 10, next 'a'-'d' follow. This time white only wins by 2.
So how can white win with 4 points in this case?
(I think I know how --ArnoHollosi)
DaveSigaty: W answers 1 with 2 as a Kikashi (forcing move). As a result, when B cuts with 5 White 6 is sente
W 8 connects at 3. Actually B 3 is pointless since he could never fight the Ko. Therefore whoever plays 3, the score will be the same in this area. After B protects the cut at 'c', the result is W+5. W has forced a better result than the solution diagram.
The marked W stone is an interesting play for more than one reason. If the marked exchange has been made then even if W plays elsewhere after 1, B can not make an eye in the corner. Without the exchange, B 1, 3, 5 will make an eye and 4 points of territory. In addition, a W block at 'a' is gote. After the exchange, B gets no eye and only 2 points from capturing the extra stones that W adds. In addition, the W play at 'a' is sente. Finally, W has the option to answer 1 with a Ko at 'b' if that is what is necessary in the overall game situation. Let's see whether that would be a good idea in this problem...
6, 9 take Ko. W initiates the Ko with 2 counting mainly on the series of Ko threats in the bottom right.
5, 8 take Ko. Both sides work through their inventory of Ko threats.
4, 7, 10 take Ko. B's 5 looks like a desperation play but it is not. W is also out of Ko threats so things get very interesting. W has no other play than 8 but 9 is a clever reply that creates a Ko threat at 'a' and protects against 8.
6 takes Ko. B has time to calmly answer 4 at 5 because W has no other Ko threats. W ends the Ko with 8 but B eats into the upper left corner. B can not resist.
3 connects Ko under marked W stone. The final result is W+3. White has not improved on the solution diagram by fighting the Ko. This is a copy of the living page "End Game Test One Solution 4" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |