Black's f6-knight cannot defend both d5 and h7 A Moiseenko vs B Savchenko, 2006  (D37) Queen's Gambit Declined, 18 moves, 1-0 29 Nd4-e6+! Black e8-rook cannot defend h8-queening, e6-forking Anand vs Ivanchuk, 2007  (B42) Sicilian, Kan, 37 moves, 0-1 43 Rxc7! overworked Black e7-queen cannot defend both c7 and f6 Mamedyarov vs M Brodsky, 2006  (A46) Queen's Pawn Game, 43 moves, 1-0 18 Bc5! overworked Black a5-queen, c8-rook tied to back rank d8 L Bruzon Batista vs Jobava, 2005  (A45) Queen's Pawn Game, 19 moves, 1-0 21 Bxf5! Black e6-bishop must defend b3-checking focal point V Gashimov vs E Inarkiev, 2005  (B90) Sicilian, Najdorf, 45 moves, 1-0 35 Qh6! since 35 ... Rxh6?? is deflection from d8 for 36 Rd8# Keres vs W Hasenfuss, 1937  (C02) French, Advance, 38 moves, 1-0 44 ... f5+! White g5-pawn cannot defend f6 en passant and h6 V Georgiev vs Jakovenko, 2007  (D27) Queen's Gambit Accepted, Classical, 50 moves, 0-1 29 - Rxf2! White f1-rook is only defender of White b1-bishop Y Visser vs I Sokolov, 2006  (C26) Vienna, 29 moves, 0-1 59 ... Na3+! 60 bxa3 Rc3# White b2-pawn cannot defend a3, c3 S Nedeljkovic vs M Udovcic, 1951  (C41) Philidor Defense, 60 moves, 0-1 37 QxNe5+! Black e8-rook must defend f8-checking focal point H Hamdouchi vs M Bezold, 1999  (A07) King's Indian Attack, 37 moves, 1-0 53 a5!!, 54 Nc6! Black b6-queen must defend b8-promotion square Aronian vs Kramnik, 2007  (D12) Queen's Gambit Declined Slav, 55 moves, 1/2-1/2 43 ... Bd4! White e3-bishop, e2-knight must defend 4-square Topalov vs Nisipeanu, 2007  (B01) Scandinavian, 47 moves, 0-1 (VAR) 31 Nxe5! Black d6-pawn cannot defend c5-knight, e5-pawn Ivanchuk vs Topalov, 2007  (B90) Sicilian, Najdorf, 41 moves, 1-0 20 Qd2xd6! Black e6-rook defends e7-square from Nf5-e7# threat Kamsky vs Mamedyarov, 2007  (B08) Pirc, Classical, 44 moves, 1-0 34 Rxf7!! Black g8-king cannot also keep White queen out of h7 Jakovenko vs A Moiseenko, 2007  (A33) English, Symmetrical, 39 moves, 1-0 24 Rd7!! Black c8-king cannot also keep White queen out of b7 J Polgar vs J L Fernandez Garcia, 2003  (B05) Alekhine's Defense, Modern, 24 moves, 1-0 30 ... Qc7xh2+! White h4-queen defends f2 from Black g4-knight R Slade vs D V Hooper, 1947  (B83) Sicilian, 31 moves, 0-1 29 Re4xBe7! Black d8-queen keeps White g4-queen out of c8 Capablanca vs Spielmann, 1911  (D02) Queen's Pawn Game, 30 moves, 1-0 White c3-queen, g3-pawn, and f5-rook all must serve two masters Gelfand vs Shirov, 2007  (D85) Grunfeld, 54 moves, 0-1 21 - Nf6xe4! White e1-rook DEFENDS b1-entry point J Rowson vs Adams, 1998  (C78) Ruy Lopez, 38 moves, 0-1 24 ... Qh5-d5! White c4-bishop DEFENDS d3-mating focal point L Didier vs Marshall, 1900  (C42) Petrov Defense, 26 moves, 0-1 36 ... Rd8-d1+! White e2-bishop cannot defend d1 =and= f1 V Liberzon vs Taimanov, 1967  (B28) Sicilian, O'Kelly Variation, 36 moves, 0-1 55 Rc5-e5!! Black e4-queen cannot defend both g4 and e5 squares Anand vs Morozevich, 2007  (B90) Sicilian, Najdorf, 56 moves, 1-0 23 Qg4xRd7! Black d8-rook cannot defend d7-rook, weak back rank Kasparov vs Karpov, 1985  (E21) Nimzo-Indian, Three Knights, 25 moves, 1-0 31 Rd1-d7! Black f7-queen cannot defend both f6-, d7-squares Hodgson vs M Hebden, 1986  (A45) Queen's Pawn Game, 36 moves, 1-0 30 Qf3-c6!! Black c7-queen defends e7-bishop,-checking square Capablanca vs F Duz-Khotimirsky, 1913  (C84) Ruy Lopez, Closed, 47 moves, 1-0 35 Rd1xBd5! Black d7-rook defends c7-queen, cannot defend d5 Kasparov vs Kramnik, 1999  (B62) Sicilian, Richter-Rauzer, 36 moves, 1-0 21 Ra1-e1? does not keep Black queen out of e2 due to back rank Bacrot vs Anand, 2001  (E20) Nimzo-Indian, 21 moves, 0-1 30 Qh4xRh8+! Black g7-king cannot defend both f7-, h8-squares M Judd vs J Congdon, 1874  (C42) Petrov Defense, 50 moves, 1-0 31 Rh8-d8! Black c7-king cannot defend both d8- and c6-squares Carlsen vs T Gulbrandsen, 2002  (C05) French, Tarrasch, 35 moves, 1-0 26 Bc1-f4! Black e6-knight must defend g7-mating focal point A Adly vs V Laznicka, 2007  (A07) King's Indian Attack, 28 moves, 1-0 34 .. Rd4-c4!! White b3-pawn blockades, cannot defend c4-square A Yurgis vs Botvinnik, 1931  (A15) English, 37 moves, 0-1 41 .. Nf8-e6?? Black d4-knight defends Black e6-knight, c6-pawn A Adly vs G Meier, 2007  (A07) King's Indian Attack, 51 moves, 1-0 22 Qf3-f6+! Black g8-knight cannot defend both e7-, f6-squares Anderssen vs Kieseritzky, 1851   (C33) King's Gambit Accepted, 23 moves, 1-0 20 Nb5-a7! Black a8-rook cannot defend c8-bishop, a7-square Keres vs Flohr, 1937  (E60) King's Indian Defense, 24 moves, 1-0 34 ... Nc6-e5! White d4-pawn cannot defend c5-rook, e5-square Ivanchuk vs Carlsen, 2007  (A46) Queen's Pawn Game, 60 moves, 0-1 13 Nd4-f5! Black e6-pawn cannot defend both d5-knight,f5-square Kramnik vs Naiditsch, 2006  (A15) English, 33 moves, 1-0 83 ... Qh3-h8+!! White g7-king cannot defend the f7-,h8-squares Kotronias vs M Hebden, 2007  (C99) Ruy Lopez, Closed, Chigorin, 12...cd, 86 moves, 1-0 17 Nd4-e6! d7-queen cannot keep d5-knight, d4-knight from c7,e6 A Nimzowitsch vs L Steiner, 1927   (C62) Ruy Lopez, Old Steinitz Defense, 21 moves, 1-0 29 Rh1-h7+! Black g7-king cannot defend both the f7-,h7-squares A Volokitin vs Bareev, 2007  (B12) Caro-Kann Defense, 29 moves, 1-0 25 Qxh7+! Black h8-rook defends e8-forking, h7-checking squares Kostic vs H Wolf, 1922  (D44) Queen's Gambit Declined Semi-Slav, 80 moves, 1-0 26 Nc6-d4?? Bc5xNd4 White d1-rook cannot defend back rank, d4 Tarrasch vs Lasker, 1908  (C49) Four Knights, 26 moves, 0-1 32 Nh5!, 33 Nf5! exploit overworked nature of Black g6-pawn Kramnik vs Morozevich, 2003  (C11) French, 37 moves, 0-1 18 ... Qe6xBc4! White e2-queen cannot defend e3-base, c4-target Steinitz vs J Minckwitz, 1870  (C25) Vienna, 18 moves, 0-1 34 Rh1-h7+! Black g7-king cannot defend both f7- and h7-squares G Sargissian vs M Tratar, 2007  (E61) King's Indian, 41 moves, 1-0 20 ... Qb4-b2! White d4-queen cannot defend both d3-,b2-squares Ljubojevic vs Morozevich, 2003  (D07) Queen's Gambit Declined, Chigorin Defense, 43 moves, 0-1 28 - Rh5!, 32 - Nf5! White g6-bishop defends neither h5 nor f5 K Georgiev vs Kasparov, 1995  (B90) Sicilian, Najdorf, 58 moves, 0-1 42 ... Nc5-e4! White e3-queen cannot defend both f2-,e4-squares Karpov vs J Polgar, 2007  (E17) Queen's Indian, 43 moves, 0-1 43 ... Rh7xh4! White f3-knight cannot block f-file, defend h4 S Atalik vs Radjabov, 2007  (E77) King's Indian, 43 moves, 0-1 24 Re1-e5! Black d6-bishop cannot defend both e7-, e5-squares Kasparov vs Timman, 1994  (C42) Petrov Defense, 30 moves, 1-0 37 d6-d7! Black e5-knight cannot blockade e4-pawn, defend d7 Mamedyarov vs Ivanchuk, 2007  (D43) Queen's Gambit Declined Semi-Slav, 39 moves, 1-0 21 c4-c5!! Black d6-pawn cannot defend c5, blockade d5-pawn Kasparov vs Leko, 2001  (C84) Ruy Lopez, Closed, 31 moves, 1-0 28 Qd2xQd7 Black f7-rook cannot defend both the d7-,f6-squares N Davies vs C Duncan, 1999  (A25) English, 30 moves, 1-0 17 Bc4xf7+! neither Black f8-rook nor g8-king really defends f7 V Soldatenkov vs S Durnovo, 1898  (C21) Center Game, 24 moves, 1-0 White c3-bishop cannot prevent royal forks on a5,d4-squares Mamedyarov vs Kamsky, 2007  (D15) Queen's Gambit Declined Slav, 41 moves, 0-1 18 Re5-f5+! Black g6-pawn cannot block h5-e8, defend f7-square Greco vs NN, 1620  (C54) Giuoco Piano, 19 moves, 1-0 26 Bf4xd6! Black e7-pawn cannot block the 7th, defend e6-square Tal vs Speelman, 1988  (B08) Pirc, Classical, 34 moves, 1-0 24 Be2-b5! Black b6-queen defends d8-promotion square, b5-squar Rublevsky vs I Hera, 2007  (B12) Caro-Kann Defense, 24 moves, 1-0 13 c4-c5 Black d6-pawn cannot defend -both- e5-pawn, c5-square Carlsen vs Z Zhao, 2007  (E11) Bogo-Indian Defense, 36 moves, 1-0 63 Rc2xc5+! Black c5-pawn cannot block a5-d8, defend c5-square E El Gindy vs Ponomariov, 2007  (E32) Nimzo-Indian, Classical, 64 moves, 1-0 24 Re1-e8! Black d8-queen cannot defend f6-base, e8-target P Chan vs Wu Kaiyu, 2001  (B05) Alekhine's Defense, Modern, 24 moves, 1-0 22 Qh5xf7+! Black d5-queen cannot defend f7-,d7-mating squares Najdorf vs NN, 1942  (D37) Queen's Gambit Declined, 23 moves, 1-0 38 - Nb5xd6! White c4-knight defends e5, e5-bishop blocks a1-h8 Portisch vs Kramnik, 1993  (D13) Queen's Gambit Declined Slav, Exchange Variation, 42 moves, 0-1 35 ... Re1xNd1! White f1-rook cannot defend d1-knight,f2-square P Nikolic vs Kramnik, 1998  (D43) Queen's Gambit Declined Semi-Slav, 35 moves, 0-1 34 f7-f8=Q+! Black g7-king cannot defend f8-promotion, g6-base Kramnik vs Nunn, 1992  (E81) King's Indian, Samisch, 33 moves, 1-0 12 ... Qf6xNg5! White g4-queen defends g5-knight, e2-mating sq H Bohm vs R Hernandez Onna, 1979  (C69) Ruy Lopez, Exchange, Gligoric Variation, 12 moves, 0-1 20 Nf3xd4! Black d7-queen cannot defend e7-bishop and d4-pawn Ponomariov vs H Wang, 2007  (D15) Queen's Gambit Declined Slav, 76 moves, 0-1 31 RxRc7 Black d8-queen cannot defend c7-rook, e8-mating square Tomashevsky vs Svidler, 2007  (A29) English, Four Knights, Kingside Fianchetto, 45 moves, 1-0 9 Nf3xe5+! Black d6-pawn must block the 6th rank from e6 to c6 Benko vs Sawyer, 1964  (C60) Ruy Lopez, 10 moves, 1-0 56 ... b4-b3! White b2-rook cannot defend d2-base, b3-square Kramnik vs Carlsen, 2008  (A30) English, Symmetrical, 57 moves, 0-1 30 Re5-e8+!! Black d7-queen cannot defend both e8-,h7-squares Fischer vs U Geller, 1968  (A07) King's Indian Attack, 32 moves, 1-0 41 ... Nf6-g4! White f3-pawn cannot blockade f4-pawn, defend g4 Spassky vs Petrosian, 1966  (A46) Queen's Pawn Game, 43 moves, 0-1 34 Rd2-d7+! Black c6-bishop cannot defend e4-queen, d7-square Carlsen vs Van Wely, 2006  (B43) Sicilian, Kan, 5.Nc3, 34 moves, 1-0 31 Qh6xh7+! Black f6-knight cannot stop mate on both f8,h7 Kramnik vs N Rashkovsky, 1991  (E33) Nimzo-Indian, Classical, 31 moves, 1-0 46 Bc3-e5! Black e8-rook cannot defend both the b8-,e5-squares Fischer vs A Di Camillo, 1957  (A07) King's Indian Attack, 49 moves, 1-0 30 ... Nd5xe3+! White f2-pawn cannot defend both e3-,g3-squares M Pavlovic vs Caruana, 2008  (D12) Queen's Gambit Declined Slav, 38 moves, 0-1 15 ... Bc8xe6! Morphy sees White c4-bishop defends d3-square T Barnes vs Morphy, 1858  (C41) Philidor Defense, 23 moves, 0-1 31 ... Bd7xh3! White g2-pawn cannot defend h3-pawn, f3-knight Ftacnik vs Seirawan, 1990  (D02) Queen's Pawn Game, 32 moves, 0-1 44 ... Rb1xBe1+! White e2-king cannot defend e1-bishop, d3-rook Topalov vs Carlsen, 2008  (B04) Alekhine's Defense, Modern, 44 moves, 0-1 21 ... Rf8xBf4! White f2-queen cannot defend f4-bishop, e2-base J Thomason vs Fischer, 1955  (E90) King's Indian, 23 moves, 0-1 19 Qb7xNc6+! Black d7-bishop cannot stop mates on both c6,e6-sq Spielmann vs M Walter, 1928  (B10) Caro-Kann, 20 moves, 1-0 24 Rf4-d4+! Black d2-rook cannot defend g2-queen, d4-check sq Rubinstein vs Lasker, 1909   (D30) Queen's Gambit Declined, 40 moves, 1-0 22 ... Re8-e5!! White f5-queen defends e5-sq, g4-checking sq T Dao vs Kasparov, 2001  (E34) Nimzo-Indian, Classical, Noa Variation, 27 moves, 0-1 42 ... Bc5xe3!! White b3-queen cannot defend e3-pawn, d1-square J Sunye Neto vs Kasparov, 1981  (D32) Queen's Gambit Declined, Tarrasch, 47 moves, 0-1 12 Bc4xf7+! Black d7-queen cannot defend both f7-pawn,d6-base Mamedyarov vs G Ginsburg, 2007  (D32) Queen's Gambit Declined, Tarrasch, 21 moves, 1-0 31 .. Rc8-c3! White d4-bishop cannot defend both c3-,f2-squares Mamedyarov vs Anand, 2008  (B20) Sicilian, 42 moves, 0-1 29 Rg2-g5!! Black f5-queen cannot defend -both- f7-,g5-squares Aronian vs H Stefansson, 2004  (D45) Queen's Gambit Declined Semi-Slav, 40 moves, 1-0 32 - Rf3xNf4! White g3-pawn cannot block g-file, defend f4-sq Euwe vs Keres, 1940  (E19) Queen's Indian, Old Main line, 9.Qxc3, 34 moves, 0-1 43 .. Qg4xNf3+! White g2-king cannot defend both f3-,h1-squares Kramnik vs Mamedyarov, 2007 (A42) Modern Defense, Averbakh System, 44 moves, 0-1 71 Ne6-c5! Black b6-king cannot defend -both- a7-,c5-squares Mamedyarov vs Bacrot, 2008  (D15) Queen's Gambit Declined Slav, 73 moves, 1-0 61 Nd5-b6! neither Black c6-rook nor a7-pawn defends b6-square S Volkov vs Y Hou, 2008  (E20) Nimzo-Indian, 61 moves, 1-0 20 Qc4-c7!! both Black c8-rook,d7-queen must defend e8-square E Z Adams vs Torre, 1920  (C41) Philidor Defense, 23 moves, 1-0 64 h2-h4+! Black g5-pawn cannot defend f4-,h4-squares en passan Carlsen vs Shirov, 2008  (D43) Queen's Gambit Declined Semi-Slav, 63 moves, 1-0 20 ... Ne5xf3! White b3-queen cannot defend f3-pawn,b5-bishop Van Wely vs Aronian, 2008  (D80) Grunfeld, 34 moves, 0-1 29 ... Ra8-c8! White e7-knight must defend the White d5-queen Onischuk vs Shirov, 2008  (D27) Queen's Gambit Accepted, Classical, 29 moves, 0-1 16 ... Nf6xe4! White c3-knight cannot defend c4-bishop,e4-pawn S Skembris vs J Polgar, 1990  (E60) King's Indian Defense, 36 moves, 0-1 37 Qh8xNf6! Black f4-queen cannot defend f6-knight,g4-square Karjakin vs Short, 2008  (B12) Caro-Kann Defense, 37 moves, 1-0 Black e7-king cannot defend light squares (f7,g6), (d5,c6,b7) Carlsen vs Pelletier, 2008  (E15) Queen's Indian, 64 moves, 1-0 28 - Ng3xe4! White f3-bishop cannot defend e4, blockade f4-pawn J Pinter vs Nunn, 1988  (E99) King's Indian, Orthodox, Taimanov, 46 moves, 0-1 45 Bc3xa5! Black d8-bishop cannot defend a5-pawn,e7-tact base E Alekseev vs Carlsen, 2008  (E15) Queen's Indian, 47 moves, 1/2-1/2 26 Bf3xh5! Black g6-pawn cannot shield g8-king,defend h5-square Kamsky vs Ivanchuk, 2008  (B33) Sicilian, 47 moves, 1-0 49 Rd3-d8+! Black d2-rook cannot defend e2-queen,d8-checking sq C Li vs H Wang, 2006  (D42) Queen's Gambit Declined, Semi-Tarrasch, 7.Bd3, 55 moves, 1-0 19 ... Nb6xc4! 20 Qe2xNc4 deflects queen away from e5-knight A Ledger vs K Arkell, 2008  (B17) Caro-Kann, Steinitz Variation, 35 moves, 0-1 19 Ne4-d6!! Black e6-queen cannot defend both f7-,e6-squares Short vs Timman, 2008  (C67) Ruy Lopez, 40 moves, 0-1 39 Bd7xc6! Black f6-queen cannot defend loose e7-rook,c6-pawn Aronian vs Grischuk, 2008  (D47) Queen's Gambit Declined Semi-Slav, 42 moves, 1-0 21 ... a3xb2! either White c3-knight or d1-rook must defend b1 A Dunkelblum vs Keres, 1937  (A46) Queen's Pawn Game, 22 moves, 0-1 30 ... Rc4xNc3+! White d2-bishop cannot defend f4-sq,c3-knight Minasian vs V Malakhov, 2006  (B32) Sicilian, 30 moves, 0-1 63 ... d4-d3 White g8-bishop cannot stop *both* d3-,h4-passers Gelfand vs Kasparov, 1992  (E92) King's Indian, 60 moves, 0-1 27 ... Rb8-b3! White c2-queen must defend 2-2 loose f2-square Smeets vs Carlsen, 2006  (B33) Sicilian, 43 moves, 0-1 35 Nb3-c5+ Black d6-pawn cannot defend c5-square, block d-file Tal vs K Klaman, 1957  (B61) Sicilian, Richter-Rauzer, Larsen Variation, 7.Qd2, 34 moves, 1-0 35 Bg3-h4! Black g6-knight cannot defend both h4-,e7-squares Rubinstein vs Maroczy, 1920   (D63) Queen's Gambit Declined, Orthodox Defense, 35 moves, 1-0 19 ... Rh8xh2! White h1-rook cannot defend both h2-,g1-squares A Yusupov vs Caruana, 2008  (D12) Queen's Gambit Declined Slav, 33 moves, 0-1 28 Qf3xRa8! Black f8-rook cannot defend a8-rook,f7-mate square Shirov vs Fridman, 2008  (D16) Queen's Gambit Declined Slav, 25 moves, 1-0 32 Qc2xg6+! Black g7-rook cannot defend g6-pawn,h7-mate square Lasker / Maroczy vs NN, 1900  (C14) French, Classical, 35 moves, 1-0 45 Rd3-c3! Black c8-rook cannot defend c3-sq, g8-promotion sq Anand vs Kramnik, 2008  (E34) Nimzo-Indian, Classical, Noa Variation, 47 moves, 1-0 24 Be3xh6! Black g7-bishop cannot defend both b2-queen,h6-pawn B Larsen vs Fischer, 1971  (A30) English, Symmetrical, 54 moves, 0-1 10 Nc3xd5! Black f6-knight defends 1-1 d5-pawn, 2-2 d7-knight Ivanchuk vs X Bu, 2008  (A15) English, 32 moves, 1-0 40 ... Rf7-f8 41 Ba4xNc6+! Black c8-queen cannot defend c6,f8 Topalov vs S Zhigalko, 2008  (E15) Queen's Indian, 40 moves, 1-0 34 - Rc3-f3! White g2-pawn cannot block e4-h1, defend f3 A Riazantsev vs Carlsen, 2005  (E12) Queen's Indian, 36 moves, 0-1 27 Bf5-g6! Black h7-pawn cannot shield h8-king, defend g6-squar Caruana vs A Kveinys, 2008  (B42) Sicilian, Kan, 30 moves, 1-0 29 Rb1-b7+! Black c7-king cannot defend both the b7-,d7-squares Tal vs D Keller, 1959  (D44) Queen's Gambit Declined Semi-Slav, 34 moves, 1-0 22 Nd5-c7! Black d8-queen cannot defend c7-square,f8-rook,sq Tal vs Birjanis, 1952  (D37) Queen's Gambit Declined, 24 moves, 1-0 18 b2-b4! Black c5-bishop cannot defend b4-sq,b6-tactical base M Rodshtein vs J Vang Glud, 2008  (D15) Queen's Gambit Declined Slav, 35 moves, 1-0 31 Rd7xf7! Black f8-rook cannot defend both b8-rook,f7-pawn Aronian vs Ivanchuk, 2008  (A04) Reti Opening, 33 moves, 1-0 37 Qg6-e8+!! Black d8-rook can't defend d5-,e8-checking squares Fischer vs Benko, 1965  (C95) Ruy Lopez, Closed, Breyer, 37 moves, 1-0 34 Qc4xRc5! Black d7-knight cannot defend both the b8-,c5-rooks Karpov vs Polugaevsky, 1974  (B92) Sicilian, Najdorf, Opocensky Variation, 41 moves, 1-0 23 Nc3xd5! Black e6-pawn cannot blockade e5-pawn, defend d5-sq Adams vs Topalov, 2006  (B84) Sicilian, Scheveningen, 42 moves, 1-0 50 ... Nd5-e3! f2-pawn blocks the 2nd rank, f3-rook defends f2 A Yusupov vs Topalov, 1993  (A48) King's Indian, 50 moves, 0-1 24 Na4-b6!! Black d7-knight can't defend b6, block d-file to d8 Z Bayaraa vs M Esserman, 2008  (B95) Sicilian, Najdorf, 6...e6, 48 moves, 0-1 63 .. Nh5xg3! White f2-bishop cannot break alignment, defend g3 E Inarkiev vs Kasimdzhanov, 2008  (C92) Ruy Lopez, Closed, 86 moves, 0-1 44 Rb1-h1+! Black f3-queen can't defend h1-square,pin f4-knight M Rodshtein vs B Amin, 2005  (A97) Dutch, Ilyin-Genevsky, 45 moves, 1-0 20 ... c6-c5! White b4-pawn cannot defend c5-sq, block b-file Lautier vs Kasparov, 1997  (A34) English, Symmetrical, 20 moves, 1/2-1/2 26 Qh4xBh5+! g6-pawn cannot defend h5-bishop, block 6th rank Duras vs Olland, 1907  (C12) French, McCutcheon, 29 moves, 1-0 28 ... Be6-h3! White g2-pawn cannot blockade g3-pawn, defend h3 Van Wely vs Mamedyarov, 2004  (A52) Budapest Gambit, 48 moves, 0-1 27 ... Qe6xBe4! c3-knight cannot defend e4, block c-file to c1 Korchnoi vs I Krush, 2007  (A28) English, 27 moves, 0-1 55 ... Rg6-g5+! White h4-pawn cannot block h-file, defend g5-sq Carlsen vs Radjabov, 2009  (B40) Sicilian, 60 moves, 1/2-1/2 18 Bg5-f6! Black g7-pawn cannot defend f6, block g-file g8-king Alekhine vs Sik, 1943  (C07) French, Tarrasch, 19 moves, 1-0 28 ... Nc5-e4!, 29 ... Ne4xf2! White f3-queen defends f1-rook I Sokolov vs Morozevich, 2005  (D08) Queen's Gambit Declined, Albin Counter Gambit, 34 moves, 0-1 24 .. Nd4-e2+! White c3-knight cannot defend a4-queen,e2-square F Vallejo Pons vs Short, 2009  (D37) Queen's Gambit Declined, 62 moves, 0-1 12 ... Nf6-d5! White e4-pawn cannot defend d5 and block e-file Kupreichik vs A Yusupov, 1982  (A03) Bird's Opening, 20 moves, 0-1 T Hillarp Persson vs So, 2009  (D11) Queen's Gambit Declined Slav, 39 moves, 0-1 36 .. Rc1-a1! a4-rook cannot defend both the a1- and g4-squares Karpov vs Kasparov, 1987  (D87) Grunfeld, Exchange, 38 moves, 1-0 42 Rh1-h7! Black g8-queen defends 2-2 loose d8-mating square Topalov vs Carlsen, 2008  (B78) Sicilian, Dragon, Yugoslav Attack, 10.castle long, 48 moves, 1-0 31 c4-c5! Black f8-bishop,c7-queen meet threats to g8-,f7-sq Kasparov vs Anand, 1999  (E20) Nimzo-Indian, 33 moves, 1-0 37 Rd4xe4! Black d6-queen cannot defend both c6-rook,d4-pawn Topalov vs Kamsky, 2009  (C07) French, Tarrasch, 55 moves, 1-0 33 Be2-a6! Black b7-pawn cannot blockade b6-pawn, defend a6-sq Carlsen vs Grischuk, 2009  (B84) Sicilian, Scheveningen, 37 moves, 1-0 53 Bd1-h5! Black g6-pawn cannot blockade g5-pawn, defend h5-sq Grischuk vs E Alekseev, 2008  (E17) Queen's Indian, 53 moves, 1-0 13 Re1xe6+! Black d7-bishop pinned to e8, f7-pawn blockades f6 I Kurnosov vs M Dzhumaev, 2008  (B07) Pirc, 15 moves, 1-0 20 ... Qd5xf3+! White f1-rook cannot defend both f3-,d1-squares L Petovic vs A Chudinovskikh, 2009  (A46) Queen's Pawn Game, 20 moves, 0-1 27 - Rd7xBd5! White c4-pawn cannot defend d5,block c-file to c1 D Doric vs D Bocharov, 2009  (E10) Queen's Pawn Game, 27 moves, 0-1 25 ... Be7xg5! f4-pawn,f3-knight cannot block lines, defend g5 Anand vs Carlsen, 2009  (B30) Sicilian, 34 moves, 0-1 46 Re6-d6 threatens 47 Rd6xNd7! Black e8-king blockades e8-sq Anand vs Ivanchuk, 2009  (C18) French, Winawer, 47 moves, 1-0 33 Ne5xg6! Black f7-pawn cannot defend *both* e6-bishop,g6-pawn Anand vs Topalov, 2003  (B50) Sicilian, 33 moves, 1-0 28 Rd3xBd5! Black e6-pawn cannot defend both d5-,f5-squares Shulman vs Van Wely, 2009  (D44) Queen's Gambit Declined Semi-Slav, 32 moves, 1-0 34 ... b3xa2 White c2-rook cannot defend a1-promo sq, c6-bishop S Li vs Y Wang, 2006  (B33) Sicilian, 35 moves, 0-1 36 ... Qb8-a7!! c5-queen *cannot* defend c3-mate square,g1-rook V Byvshev vs Tolush, 1954  (B94) Sicilian, Najdorf, 36 moves, 0-1 32 ... Rd2xf2? 33 Rc8xc7+! Black c2-rook cannot defend f2,c7 Karjakin vs Aronian, 2009  (C84) Ruy Lopez, Closed, 34 moves, 1-0 29 ... d6-d5! White e4-pawn cannot blockade e4-sq, defend d5-sq Kasparov vs Anand, 2001  (C78) Ruy Lopez, 37 moves, 1/2-1/2 38 Rb6xh6+! Black g7-pawn blocks g-file, h7-king defends h8-sq B Grachev vs V Akobian, 2009  (D37) Queen's Gambit Declined, 38 moves, 1-0 67 Qc8xRe6! f7-pawn cannot defend e6-rook, blockade f7-square Spassky vs B Larsen, 1969  (C60) Ruy Lopez, 67 moves, 1-0 34 Rf2xf7+! Black e7-king cannot defend both d7-,f7-squares Mamedyarov vs Svidler, 2009  (D45) Queen's Gambit Declined Semi-Slav, 36 moves, 1-0 29 ... Rf8-f1!? White g2-king cannot defend both f1-,h1-squares Mamedyarov vs Kramnik, 2009  (D37) Queen's Gambit Declined, 58 moves, 0-1 42 ... Rd8-d1+! White e1-king cannot defend both d1-,f1-squares Ivanchuk vs Topalov, 2009  (B99) Sicilian, Najdorf, 7...Be7 Main line, 54 moves, 0-1 23 Rf1-f8+! Black d4-queen cannot defend both d4-,f8-check sq Motylev vs Shirov, 2009  (C48) Four Knights, 24 moves, 1-0 26 ... Rc6xBc2! overloads White d2-rook which also protects d3 A Riazantsev vs I Iljiushenok, 2015  (D08) Queen's Gambit Declined, Albin Counter Gambit, 42 moves, 0-1 32 Rh1xh6+! 1-0 g7-bishop cannot protect both c3-queen & h6-sq Smejkal vs Adorjan, 1972  (E63) King's Indian, Fianchetto, Panno Variation, 32 moves, 1-0 166 games