Tactics (11)

Black to move in Erdogdu - Stocek (Pardubice 2009).

Solution (diff. ●●○○○): 37.- Qf1+ 38.Kg3 Bb4! (-> Be1+) 39.Bxf7+ (39.Rc3 loses material) . Now 39.- Kh8! would have been winning. Unfortunately Black continued with 39.- Kxf7 40.Qh7+ Ke8 41.Rxe6+ Kd8 42.Bd2! with an unclear position (1/2-1/2, 54.).