Endgame Problem 27 / Solution
![[Diagram]](../../diagrams/30/87871e84ff7f59249e4fa27366f62b1f.png)
Black plays first
removes the main aji in the corner.
Later,
-
is sente.
The result is +9 (for Black).
![[Diagram]](../../diagrams/26/85dfb7c1490e307c0b894f1680993374.png)
White plays first (ii)
Now,
is tesuji, preventing ko or seki and allowing
.[1]
![[Diagram]](../../diagrams/29/a855845b633e2332c10fb2af634c5c2b.png)
White plays first (iii)
Later,
-
is sente.
The result is +4.
So this is White's 5-point sente.
In the game, both players overlooked it.
--Bill Spight
[1]
![[Diagram]](../../diagrams/48/be0160710b4d5babebd165c5b0369aaa.png)
Ko or seki
takes at
.
If
hanes,
should normally be at a.
is immune to immediate capture, because of snapback.
![[Diagram]](../../diagrams/24/128d99587cf454bc7ffdc18ca6dc3d2d.png)
Ko or seki (ii)
Now Black can make a seki at a or make a picnic ko for White at b.
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