Charles Matthews In most cases Black will not treat White 1 here as a real ko threat, however. Black can live with 2 and 4, which allows White a sente profit but not a very big one. This should normally be better for Black than having to ignore some other threat.
 Bill: This talk about White's making a profit reveals a way of thinking that needs revision. Sure, White has a local advantage. And Black has made an inefficient shape. So we may expect that White has already made a profit, here. We would have to see whether Black gained anything in return to be sure. But, in any event, in future play either player may make a local profit.