There is an important difference in positions where Black uses the seventh-rank knight defence. In a similar position with the c-pawn Black draws regardless of who is to move. Here again Black to move draws by repetition: 1.. .Nd6+ 2.Ke7 Nc8+ ( Also possible 2…Nf5+. ) or gains a pawn. But White to move wins because Black is incapable of defence by stalemate!