Problem diagram.
Black plays.

Source:
Tesuji Dictionary, Vol. 1, Tsuke #90,
Segoe Kensaku & Go Seigen, Ishi Press

Solution follows    (or click here to download SGF)

A beautiful move.
If at a glance you can spot this best move at 1, and see all the ramifications, then please quit your day job and teach us go.

White 2 must prevent Black from playing at 2, which would split the white groups and destroy White's bottom territory. But the clamp of Black 3 exposes the inherent weakness in White's position. With 5, Black splits White anyway and takes the entire corner.

White variation.
White might also try to defend at 2. But Black 3 and 5 still split White.

A Black mistake.
Black 1 is a small gote endgame play. White will ignore this atari to protect the weakness (around A) that the main line exposes.

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