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OBLIGATION RESTRICTS MOBILITY <OBLIGATION RESTRICTS MOBILITY>

A piece can perform only one important function

20 ... ♖h8xh4!! wins because both the White g5-bishop and White h1-rook must <DEFEND> the <LOOSE> (2-2) c1-mating focal point.


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OBLIGATION RESTRICTS MOBILITY <OBLIGATION RESTRICTS MOBILITY>

Event "Budapest FS07 GM"
Site "Budapest"
Date "2004.07.03"
Round "1"
White "McDonald,Neil R"
Black "Nagle,Sean"
Result "0-1"
Eco "B18"

1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Bc4 e6 7. N1e2 Bd6 8. Nf4 Nf6 9. h4 Qc7 10. Nxg6 hxg6 11. Qf3 Nbd7 12. Bg5 c5 13. O-O-O cxd4 14. Bb5 Rc8 15. Kb1 Kf8 16. Rxd4 Qxc2+ 17. Ka1 Be5 18. Qa3+ Kg8 19. Rxd7 Nxd7 20. Bxd7 Rxh4 21. Rb1 Rd4
0-1

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 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
Judit Polgar vs J 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 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
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
J M Hodgson vs Hebden, 1986 
(A45) Queen's Pawn Game, 36 moves, 1-0

30 Qf3-c6!! Black c7-queen defends e7-bishop,-checking square
Capablanca vs Dus Chotimirsky, 1913 
(C88) Ruy Lopez, 47 moves, 1-0

35 Rd1xBd5! Black d7-rook defends c7-queen, cannot defend d5
Kasparov vs Kramnik, 1999 
(B66) Sicilian, Richter-Rauzer Attack, 7...a6, 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 A 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 
(A08) 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 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
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
B Kostic vs H Wolf, 1922 
(D37) Queen's Gambit Declined, 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
Kiril D 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 Judit 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 Zhao Zong-Yuan, 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 
(D35) Queen's Gambit Declined, 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 Roman Hernandez, 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 Wang Hao, 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 
(A08) 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 W Barnes vs Morphy, 1858 
(C41) Philidor Defense, 24 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 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 Yifan 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 Carlos 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
Skembris vs Judit 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
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
Li Chao vs Wang Hao, 2006 
(B01) Scandinavian, 55 moves, 1-0

19 ... Nb6xc4! 20 Qe2xNc4 deflects queen away from e5-knight
A Ledger vs 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
A Minasian vs V Malakhov, 2006 
(B36) Sicilian, Accelerated Fianchetto, 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
J 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
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 D 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 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
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 Bu Xiangzhi, 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 
(B85) Sicilian, Scheveningen, Classical, 42 moves, 1-0

50 ... Nd5-e3! f2-pawn blocks the 2nd rank, f3-rook defends f2
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 Yusupov, 1982 
(A03) Bird's Opening, 20 moves, 0-1

T Hillarp Persson vs W 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 
(A32) English, Symmetrical Variation, 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 
(B85) Sicilian, Scheveningen, Classical, 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
Y 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
Li Shilong vs Wang Yue, 2006 
(B33) Sicilian, 35 moves, 0-1

36 ... Qb8-a7!! c5-queen *cannot* defend c3-mate square,g1-rook
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 Akobian, 2009 
(D37) Queen's Gambit Declined, 38 moves, 1-0

67 Qc8xRe6! f7-pawn cannot defend e6-rook, blockade f7-square
Spassky vs 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

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