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Seki inside the bulky five
    Keywords: Life & Death

A seki that will probably never see the light of day...

[Diagram]
Seki


Jasonred : ... why... oh, fine, I'll indulge you. I guess that this shape can come about during poor playing when there are 3 very large kos in the game. Black plays in there, white ignores... no, wait, that's impossible too, since black's first move kills the shape... in fact, why has black just changed killing a group into a seki???

[Diagram]
Making seki



Bill: I doubt if this particular situation would arise on the board, but I seem to recall this shape occurring in a more complicated situation.

Charles I've found a near-miss in a pro game (Hashimoto Utaro-Iwamoto Kaoru 1936-05-31). Clearly enough the middle stone would be the final one played (otherwise Black could kill); but White's external liberties should also be filled, or White could prevent the seki by oshitsubushi. In the game I mentioned preventing the seki might have cost one point in teire.



This is a copy of the living page "Seki inside the bulky five" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.