43 - Bc3-d4!! White e3-bishop, e2-knight don't defend d4 and f4 Topalov vs Nisipeanu, 2007  (B01) Scandinavian, 47 moves, 0-1 36 ... Rd8-d1+! White e2-bishop cannot DEFEND both d1 and f1 V Liberzon vs Taimanov, 1967  (B28) Sicilian, O'Kelly Variation, 36 moves, 0-1 27 Qd3xh7+! Black g8-bishop cannot DEFEND both f7 =and= h7 Shirov vs O Renet, 1991  (E25) Nimzo-Indian, Samisch, 28 moves, 1-0 38 .. Rg5xe5! White e3-queen cannot defend both f3-,e5-squares G A Thomas vs Lasker, 1936  (D63) Queen's Gambit Declined, Orthodox Defense, 55 moves, 0-1 55 Rc5-e5!! Black e4-queen must defend g4-checking focal point Anand vs Morozevich, 2007  (B90) Sicilian, Najdorf, 56 moves, 1-0 33 Be6+!! Re7xe6?? deflects Black e7-rook from g7-mating square Svidler vs Morozevich, 2007  (B17) Caro-Kann, Steinitz Variation, 44 moves, 1/2-1/2 23 Qg4xRd7! Black d8-rook cannot defend d7-rook, e8-checking sq Kasparov vs Karpov, 1985  (E21) Nimzo-Indian, Three Knights, 25 moves, 1-0 31 Rd1-d7! Black f7-queen must defend f6-checking focal point Hodgson vs M Hebden, 1986  (A45) Queen's Pawn Game, 36 moves, 1-0 30 Qf3-c6!! Black c7-queen cannot defend the e7- and c6-squares Capablanca vs F Duz-Khotimirsky, 1913  (C84) Ruy Lopez, Closed, 47 moves, 1-0 35 RxBd5! Black d7-rook cannot defend both c7-queen, d5-bishop Kasparov vs Kramnik, 1999  (B62) Sicilian, Richter-Rauzer, 36 moves, 1-0 21 Ra1-e1? Qh5-e2! White e2-rook cannot defend e2-, b1-squares Bacrot vs Anand, 2001  (E20) Nimzo-Indian, 21 moves, 0-1 30 Qh4xRh8+! Black g7-king defends h8-rook, f7-tactical base M Judd vs J Congdon, 1874  (C42) Petrov Defense, 50 moves, 1-0 30 Bf4-d6+! Black d7-queen must defend g7-mating focal point A Adly vs V Laznicka, 2007  (A07) King's Indian Attack, 28 moves, 1-0 41 ... Nf8-e6?? Black d4-knight must now defend both e6 and c6 A Adly vs G Meier, 2007  (A07) King's Indian Attack, 51 moves, 1-0 22 Qf3-f6+! Black g8-knight must defend e7-mating focal point Anderssen vs Kieseritzky, 1851   (C33) King's Gambit Accepted, 23 moves, 1-0 20 Nb5-a7! Black a8-rook cannot defend both c8-, a7-squares Keres vs Flohr, 1937  (E60) King's Indian Defense, 24 moves, 1-0 White must defend "anchor", the c4-square , from Black knights Korchnoi vs Kasparov, 2000  (D85) Grunfeld, 54 moves, 0-1 34 ... Nc6-e5! White d4-pawn can't prevent e5 knight instrusion Ivanchuk vs Carlsen, 2007  (A46) Queen's Pawn Game, 60 moves, 0-1 13 Nd4-f5! Black e6-pawn must defend d5-square, stop Qb3xNd5 Kramnik vs Naiditsch, 2006  (A15) English, 33 moves, 1-0 83 ... Qh3-h8+!! the White g7-king must defend f7-tactical base Kotronias vs M Hebden, 2007  (C99) Ruy Lopez, Closed, Chigorin, 12...cd, 86 moves, 1-0 17 Nd4-e6! d7-queen defends c7-tactical base of White d5-knight Nimzowitsch vs L Steiner, 1927   (C62) Ruy Lopez, Old Steinitz Defense, 21 moves, 1-0 29 Rh1-h7+! Black g7-king must keep White f3-queen out of f7 A Volokitin vs Bareev, 2007  (B12) Caro-Kann Defense, 29 moves, 1-0 31 Re1-e6! Black e7-rook must defend the g7-mating focal point Mamedyarov vs M Gurevich, 2007  (D43) Queen's Gambit Declined Semi-Slav, 31 moves, 1-0 25 Qxh7+! Black h8-rook defends e8-forking square of f6-knight Kostic vs H Wolf, 1922  (D44) Queen's Gambit Declined Semi-Slav, 80 moves, 1-0 26 Nc6-d4?? Bc5xNd4 White d1-rook defends e1-checking square Tarrasch vs Lasker, 1908  (C49) Four Knights, 26 moves, 0-1 18 ... Qe6xBc4! White e2-queen must defend the e3-tactical base Steinitz vs J Minckwitz, 1870  (C25) Vienna, 18 moves, 0-1 34 Rh1-h7+! Black g7-king defends the f7-square from e8-queen G Sargissian vs M Tratar, 2007  (E61) King's Indian, 41 moves, 1-0 20 ... Qb4-b2! White d4-queen keeps Black f4-knight out of d3 Ljubojevic vs Morozevich, 2003  (D07) Queen's Gambit Declined, Chigorin Defense, 43 moves, 0-1 42 .. Nc5-e4! White e3-queen defends f2-bishop/f2-mating square Karpov vs Polgar, 2007  (E17) Queen's Indian, 43 moves, 0-1 24 Re1-e5! Black d6-bishop must defend e7-royal forking square Kasparov vs Timman, 1994  (C42) Petrov Defense, 30 moves, 1-0 33 Bd5-f7! Black e8-queen defends e5-pawn from White g4-knight Mamedyarov vs Ivanchuk, 2007  (D43) Queen's Gambit Declined Semi-Slav, 39 moves, 1-0 27 Nf3-e5! Black d6-pawn defends e5, does not block the d-file N Davies vs C Duncan, 1999  (A25) English, 30 moves, 1-0 17 Bc4xf7+! Black f8-rook defends e8, Black g8-king defends h7 V Soldatenkov vs S Durnovo, 1898  (C21) Center Game, 24 moves, 1-0 41 ... Ne6xd4! White c3-bishop defends the a5-base of c4-knight Mamedyarov vs Kamsky, 2007  (D15) Queen's Gambit Declined Slav, 41 moves, 0-1 24 Be2-b5! Black b6-queen must defend the d8-promotion square Rublevsky vs I Hera, 2007  (B12) Caro-Kann Defense, 24 moves, 1-0 29 Ndd-e6+! Black e8-rook must defend the h8-promotion square Anand vs Ivanchuk, 2007  (B42) Sicilian, Kan, 37 moves, 0-1 13 c4-c5 Black d6-pawn must defend Black e5-pawn/e5-square Carlsen vs Z Zhao, 2007  (E11) Bogo-Indian Defense, 36 moves, 1-0 55 ... h7-h5 White g5-pawn defends f6-knight, not h6 en passant Mamedyarov vs Carlsen, 2007  (A57) Benko Gambit, 58 moves, 0-1 24 Re1-e8! Black d8-queen keeps d5-knight from f6-tactical base P Chan vs Wu Kaiyu, 2001  (B05) Alekhine's Defense, Modern, 24 moves, 1-0 22 Qh5xf7+! Black d5-queen defends d7-mating square, Ne5-d7# Najdorf vs NN, 1942  (D37) Queen's Gambit Declined, 23 moves, 1-0 35 Re1xNd1! White f1-rook must keep Black h4-queen out of f2 P Nikolic vs Kramnik, 1998  (D43) Queen's Gambit Declined Semi-Slav, 35 moves, 0-1 34 f7-f8=Q+! Black g7-king must defend g6-base of f4-knight Kramnik vs Nunn, 1992  (E81) King's Indian, Samisch, 33 moves, 1-0 12 ... Qf6xNg5! White g4-queen must defend the e2-mating square H Bohm vs R Hernandez Onna, 1979  (C69) Ruy Lopez, Exchange, Gligoric Variation, 12 moves, 0-1 20 Nf3xd4! Black d7-queen defends e7-bishop from Re1xBe7 threat Ponomariov vs H Wang, 2007  (D15) Queen's Gambit Declined Slav, 76 moves, 0-1 31 Rc1xRc7 Black d8-queen must defend e8-square else 32 Qa4-e8# Tomashevsky vs Svidler, 2007  (A29) English, Four Knights, Kingside Fianchetto, 45 moves, 1-0 15 ... Nd7-c5! White c2-queen defends e2-mating square not f5 J Rotstein vs Uhlmann, 2007  (C01) French, Exchange, 54 moves, 0-1 27 ... Nd1-f2! White e1-queen cannot defend e5-bishop,f2-square Smeets vs Y Hou, 2008  (C13) French, 58 moves, 0-1 38 .. c4-c3+! White d2-queen cannot defend c3-square, e2-knight Vaganian vs Short, 1989  (D35) Queen's Gambit Declined, 53 moves, 0-1 27 ... Nf6-g4!! White e2-queen cannot defend g4-,f2-squares A Korotylev vs Mamedyarov, 2007  (B06) Robatsch, 30 moves, 0-1 71 g4-g5+! Black f6-king cannot defend e7-bishop, g5-square Short vs I Cheparinov, 2008  (B92) Sicilian, Najdorf, Opocensky Variation, 72 moves, 1-0 56 ... b4-b3! White b2-rook must defend the d2-tactical base Kramnik vs Carlsen, 2008  (A30) English, Symmetrical, 57 moves, 0-1 51 Qb5xb3?? White b1-rook cannot defend b3-queen, e1-square Eljanov vs Ivanchuk, 2008  (E00) Queen's Pawn Game, 56 moves, 0-1 30 Re5-e8+!! Black d7-queen must defend Black h7-pawn,square Fischer vs U Geller, 1968  (A07) King's Indian Attack, 32 moves, 1-0 31 Qh6xh7+! Black f6-knight must stop mate on g8-square Kramnik vs N Rashkovsky, 1991  (E33) Nimzo-Indian, Classical, 31 moves, 1-0 46 Bc3-e5! Black e8-rook prevents promotion of b7-passer on b8 Fischer vs A Di Camillo, 1957  (A07) King's Indian Attack, 49 moves, 1-0 19 ... d3-d2+! White d1-rook must defend loose White f1-rook T Barnes vs Morphy, 1858  (C41) Philidor Defense, 23 moves, 0-1 24 Rf4-d4+! Black d2-rook defends d4-sq, hangs Black g2-queen Rubinstein vs Lasker, 1909   (D30) Queen's Gambit Declined, 40 moves, 1-0 12 Bc4xf7+! Black d7-queen defends d6-base from White e4-knight Mamedyarov vs G Ginsburg, 2007  (D32) Queen's Gambit Declined, Tarrasch, 21 moves, 1-0 31 ... Rc8-c3! White d4-bishop must defend f2-royal fork square Mamedyarov vs Anand, 2008  (B20) Sicilian, 42 moves, 0-1 29 Rg2-g5!! Black f5-queen defends f7-base of White e5-knight Aronian vs H Stefansson, 2004  (D45) Queen's Gambit Declined Semi-Slav, 40 moves, 1-0 43 ... Qg4xNf3+! White g2-king must defend h1-promotion square Kramnik vs Mamedyarov, 2007 (A42) Modern Defense, Averbakh System, 44 moves, 0-1 72 Nc5-d7! Black d8-rook defends b8-queening square of b7-pawn Mamedyarov vs Bacrot, 2008  (D15) Queen's Gambit Declined Slav, 73 moves, 1-0 13 Rd1-d8+! Black e8-king defends f7-base of White e5-knight Anand vs N Sulava, 2004  (C10) French, 17 moves, 1-0 20 ... Nf5xh4! White g3-pawn must defend loose White f4-knight Smyslov vs Botvinnik, 1954  (A07) King's Indian Attack, 36 moves, 0-1 61 Nd5-b6! Black c6-rook must defend c8-promotion square S Volkov vs Y Hou, 2008  (E20) Nimzo-Indian, 61 moves, 1-0 64 h2-h4+! Black g5-pawn defends f4-square from White f2-pawn Carlsen vs Shirov, 2008  (D43) Queen's Gambit Declined Semi-Slav, 63 moves, 1-0 29 ... Ra8-c8! White e7-knight defends d5-queen from .. Qd5xQd5 Onischuk vs Shirov, 2008  (D27) Queen's Gambit Accepted, Classical, 29 moves, 0-1 37 Qh8xNf6! Black f4-queen must defend the g4-mating square Karjakin vs Short, 2008  (B12) Caro-Kann Defense, 37 moves, 1-0 45 Bc3xa5! Black d8-bishop defends e7-base, not Black a5-pawn E Alekseev vs Carlsen, 2008  (E15) Queen's Indian, 47 moves, 1/2-1/2 19 Ne4-d6!! Black e6-queen defends f7-base of White e5-knight Short vs Timman, 2008  (C67) Ruy Lopez, 40 moves, 0-1 21 - a3xb2! White c3-knight,d1-rook cannot both attack d5-knigh A Dunkelblum vs Keres, 1937  (A46) Queen's Pawn Game, 22 moves, 0-1 27 Qh6-f6!! Black f8-rook defends g8-square from mate threat J Werle vs P K Wells, 2008  (D39) Queen's Gambit Declined, Ragozin, Vienna Variation, 27 moves, 1-0 30 ... Rc4xNc3+! White d2-bishop must defend f4-sq to stop mate Minasian vs V Malakhov, 2006  (B32) Sicilian, 30 moves, 0-1 35 Bg3-h4! Black g6-knight keeps White e6-queen out of e7-sq Rubinstein vs Maroczy, 1920   (D63) Queen's Gambit Declined, Orthodox Defense, 35 moves, 1-0 28 Qf3xRa8! Black f8-rook must avert mate by defending f7-sq Shirov vs Fridman, 2008  (D16) Queen's Gambit Declined Slav, 25 moves, 1-0 45 Rd3-c3! Black c8-rook must defend loose g8-promotion square Anand vs Kramnik, 2008  (E34) Nimzo-Indian, Classical, Noa Variation, 47 moves, 1-0 24 Be3xh6! Black g7-bishop must defend 1-1 loose Black b2-queen Larsen vs Fischer, 1971  (A30) English, Symmetrical, 54 moves, 0-1 10 Nc3xd5! Black f6-knight must defend Black d7-knight Ivanchuk vs X Bu, 2008  (A15) English, 32 moves, 1-0 22 Nd5-c7! Black d8-queen must defend the f8-rook,mating square Tal vs Birjanis, 1952  (D37) Queen's Gambit Declined, 24 moves, 1-0 18 b2-b4! Black c5-bishop defends b6-base of White c4-knight M Rodshtein vs J Vang Glud, 2008  (D15) Queen's Gambit Declined Slav, 35 moves, 1-0 50 ... Nd5-e3! White f3-rook must defend the f2-pinning square Yusupov vs Topalov, 1993  (A48) King's Indian, 50 moves, 0-1 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 82 games