 (trapping the knight) 50.Kf3 Ka6 51.Ke4 Ka5 52.Kxd4 Kxa4 53.Kc3 Ka3 and Black's pawn queens after all.Instead, Marco played 45...Be5, mistakenly thinking that this would put an end to Marshall's tricks.The game continued 46.cxb7+ Kb8 (46...Kxb7?