This descent tesuji is a simple but easy-to-overlook way to gain a liberty, in corner capturing races:
It looks as if Black has lost this race, with three liberties against four. But
will create a shortage of liberties for White, who will have to
spend an extra approach move:
The hane at is a mistake. White can force a ko with the throw-in at
followed by an atari at
.
For other descent tesuji see Descent Example 1, Descent Tesuji 2, and Ugly Sagari.
This move is sometimes called sagari in English, but according to John F. this term would not be used here in Japanese.
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