# Endgame Problem 27 / Attempts

Sub-page of EndgameProblem27
Attempt 1 (6 at the position of the marked stone)
Attempt 1 (continuation)

White 13 and 15 are of course kept back as ko threats. Black's territory is reduced to 8 points, while white has captured a stone.

Black's failure

here instead of is not good. White makes a seki. This is 6 points worse for black than the previous answer.

Bill:
Key point

In this position, I think that is the key point, instead of the atari at a. Next:

Key point (1): Seki

If Black connects, White makes seki in sente, for a result of -4. (White has lost 2 stones, but Black will have to give up one later.)

Key point (1a): No Seki

Oops! I had overlooked , which avoids both seki and ko. :-(

Key point (2)

If Black takes the corner, White captures 4 stones in sente. The result is also -4. White has 14 points, but Black has 10.

Bill: Since I had overlooked Black's play on the 2-1 ( in the Key Point (1a) diagram), my original (supposed) solution was wrong. Let me try again.

Attempt 2

( was the last play before this diagram.) connects at .

After Black fills at 2, plays atari. Now is tesuji, allowing . - is sente, which can be played later.

This position can be reached after in Andre's original digram. gains 2 points for Black, by comparison with the hane at 8.

Endgame Problem 27 / Attempts last edited by Bill on June 5, 2006 - 23:48
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