 He continued 45.c6 Now Black could have played 45...bxc6!, but disdained it because White could then play 46.Rxc7+ Kb8 47.Rb7+!Kxb7 48.Nc5+, winning Black's rook and stopping Black's pawn from advancing.Black should have played this line, however, because he still wins after 48...Ka7 49.Nxa4 Bd4!