EVENT
BOARDSIZE 19
DATE 2002-06-15
KOMI 5.5
RULES Japanese
SETUP W D16 D4 D6 H4 J3 H3 K3 M3 R11 
SETUP B F3 F5 G5 H5 J4 K4 L4 N5 Q4 Q16 
MARK A@C10
COM
Supplement to Problem 25: White's best move.

Instead extending to A in the Problem Diagram, ...
ENDCOM
W 1 O3
MARK A@N3
COM
... White should have jumped to 1. Her stones are now secure.
Many joseki books give only the extension to White A as the next
move, but 1 here is prefered because it aims at the outside.
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ENDCOM