51 ... Qxf4+! White e3-queen obligated to block back rank on g1 Keres vs Petrosian, 1959  (B39) Sicilian, Accelerated Fianchetto, Breyer Variation, 51 moves, 0-1 39 ... Rf7xf3?? 40 Qh6# Black f7-rook obligated to block on h7 Movsesian vs Predojevic, 2004  (B43) Sicilian, Kan, 5.Nc3, 40 moves, 1-0 36 ... f3! none of White's three pieces actually defends f3 D Gurevich vs J Polgar, 2006  (E99) King's Indian, Orthodox, Taimanov, 36 moves, 0-1 24 - Rxa3!! White b2-pawn, a1-rook, d3-queen do -not- defend a3 V Mikenas vs Bronstein, 1965  (A53) Old Indian, 24 moves, 0-1 Black e6-bishop tied to a2-g8 diagonal: 21 Bxf5!, 21 Rd7+!! V Gashimov vs E Inarkiev, 2005  (B90) Sicilian, Najdorf, 45 moves, 1-0 21 ... axb2! restricts mobility of White c3-N or d1-R to b1 A Dunkelblum vs Keres, 1937  (A46) Queen's Pawn Game, 22 moves, 0-1 24 Re1-e5! the Black d6-bishop cannot leave the a3-f8 diagonal Kasparov vs Timman, 1994  (C42) Petrov Defense, 30 moves, 1-0 White g3-queen must pin on g-file so f4-bishop is undefended Geller vs Tal, 1959  (A71) Benoni, Classical, 8.Bg5, 42 moves, 0-1 87 f4-f5! Black e6-pawn defends Black d5-bishop not f5-square Radjabov vs Anand, 2008  (D44) Queen's Gambit Declined Semi-Slav, 85 moves, 1-0 16 c5-c6 Black b7-queen cannot defend c6-square, Black e7-pawn Carlsen vs Eljanov, 2008  (D91) Grunfeld, 5.Bg5, 54 moves, 1-0 27 ... Nd1-f2! White e1-queen defends e5-bishop, not f2-square Smeets vs Y Hou, 2008  (C13) French, 58 moves, 0-1 34 Be2-b5! Black e8-queen must defend the loose Black e5-knight Short vs I Cheparinov, 2008  (B92) Sicilian, Najdorf, Opocensky Variation, 72 moves, 1-0 73 Rc6-c1! Black b1-rook is restricted to b-file else b7-b8=Q Carlsen vs Shirov, 2008  (C78) Ruy Lopez, 80 moves, 1-0 39 ... Nd5-f4! since White e4-queen must defend White c2-bishop Nunn vs Seirawan, 1992  (B12) Caro-Kann Defense, 51 moves, 0-1 42 ... Rb6-c6! White c3-queen cannot leave 3rd rank else mate Gelfand vs Karjakin, 2008  (A07) King's Indian Attack, 46 moves, 0-1 31 .. Rc8-c3! White d4-bishop controls squares only along a7-g1 Mamedyarov vs Anand, 2008  (B20) Sicilian, 42 moves, 0-1 71 Ne6-c5!, 72 Nc5-d7! exploit overworked Black defenders Mamedyarov vs Bacrot, 2008  (D15) Queen's Gambit Declined Slav, 73 moves, 1-0 61 Nd5-b6! Black c6-rook,a7-pawn must meet other threats S Volkov vs Y Hou, 2008  (E20) Nimzo-Indian, 61 moves, 1-0 20 Qc4-c7!! Black c8-rook,d7-queen tied to mate threat to e8-sq E Z Adams vs Torre, 1920  (C41) Philidor Defense, 23 moves, 1-0 19 games