52 Bc2xBd1 a4-a3 White b3-pawn prevents the saving 53 Bd1-b3 Gelfand vs Wang Yue, 2008  (D17) Queen's Gambit Declined Slav, 54 moves, 0-1 38 ... Bf7-g8?? self-blocks g8-flight square for 39 Nf4-g6# Tkachiev vs Ivanchuk, 2009  (C01) French, Exchange, 39 moves, 1-0 2 games