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Semedori example
Keywords: EndGame
What if anything can White gain by playing here?
A difficult position, Charles! :-)
Charles From a game of mine last week. I thought the basic idea was the cut at 3 for White, to gain points. Preparation 1 for 2 is obvious enough. White a for Black b would presumably been White's prerogative. I didn't see a seki, but perhaps the position isn't exactly as in the game: I simplified it somewhat.
So, Black 8 caught me a little by surprise. Now it becomes important how many liberties the lower black group has on the outside.
Bill: White can also start this way, I think. Off to the races. ;-)
Charles So now Black is in a hurry to play 1? Ah, but now I see that White 4 is too naive.
DaveSigaty: The approach seems right for Black but 3 here would be slightly better at 4 (see below [1]) perhaps.
And now? Could become a double ko?
Bill: B 1 is, I believe, tesuji. Now White has nothing better than W 2, I think, and the end result should be the same as the main line starting with the cut. But it is complicated. :-)
DaveSigaty: After 3 if White plays 4, she is simply captured by Black 5, so...
White has to play 4 and after the sequence to 8, Black can tenuki. White has achieved a double ko that can provide unlimited ko threats but in gote.
In comparison, this White 8 threatens to capture the outside ko and connect. Black's capture of the inner ko is not atari on the White stones. Black has to play 9 so White has created the double ko in sente.
Bill: With the potential Black eye gone at a, White's next play is, I believe, to atari with W 1 and then connect at W 3. Through B 8 White loses the semeai, but forces Black to take all the White stones.
W 3 - B 4 is almost always sente, since Black can rarely afford to let White make a huge ko.
Alternatively, Black can connect with B 1. Then W 2 prevents an eye for Black. B 3 wins the semeai.
Now W 1 - B 4 is sente. All roads lead to Rome, more or less. This is a copy of the living page "Semedori example" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |