The current point one more time in a slightly different visual setting. (Its inclusion here may be tedious; your patience with it will be rewarded in the next frame, however, which usefully shows how it came into existence.) White’s queen pins Black’s queen, but can’t capture it profitably because it is protected by the knight on e7. If White plays BxN, Black plays the usual QxQ. As before, White can steal Black’s queen if he can use forcing moves to create a pin of its defender. Again he plays Rd8+; again Black plays KxR; again White now plays QxQ with impunity.