is the natural response to . captures the stones.
If White stubbornly resists with , prevents escape. Then,
Black gets full work out of .
SkyCrashesDown: Doesn't playing here instead capture an extra white stone ?
JanRamon: Not really. the one white stone is not so important because now the two cutting white stones can escape with . Up to , Black can only capture these cutting stones in ko. If White wins the ko, Black's center stones are dead.