Problem diagram.
White plays.

Source:
Tesuji Dictionary, Vol. 1, Hasami-tsuke #7,
Segoe Kensaku & Go Seigen, Ishi Press

Solution follows    (or click here to download SGF)

Correct.
Amazingly, White 1 is the only nove. Surely, Black only needs to cut off White with 2 to save his Black corner stones and kill White? And White's throw-in at 3 only seems to help Black make eyes! But with 5, Black is in a shortage of liberties. Black 6 desparately seeks to gain some freedoms, but White has time to make 2 eyes through 9.

Black variation.
Black can also try to make an eye for his bottom side stones with 2. But once again, with 7, White simultaneously threatens a capture and 2 eyes.

Black variation.
Black 2 is the toughest defense. White 5 is a throw-in at 7. And White duplicates the throw-in with 7. And Black's liberty nightmare recurs with White threatening both a capture and 2 eyes.

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