29 ... Rd8-d6? leaves behind c8-remove guard sq, 30 Bb7-c8! 1-0 O Ulvestad vs I A Horowitz, 1946  (D74) Neo-Grunfeld, 6.cd Nxd5, 7.O-O, 30 moves, 1-0 36 Qe1-c3?? protects b2-sq but abandons g1 for 36 .. Qb6-g1+ -+ I Chelushkina vs N Kosintseva, 2010  (B62) Sicilian, Richter-Rauzer, 66 moves, 0-1 32 ... Nf6-e8? leaves e4-pawn loose for shocking 33 Bg2xe4+! Alekhine vs Tartakower, 1930  (A90) Dutch, 50 moves, 1-0 31 .. Qd5xa2?? leaves behind Black f5-rook, overloading e6-pawn T Kosintseva vs A Stefanova, 2011  (B12) Caro-Kann Defense, 32 moves, 1-0 4 games