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Tactical targets determine tactical bases
Compiled by notyetagm
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You need only *one* <TACTICAL TARGET> for a <FORK>. The <TACTICAL TARGET> then determines the possible <TACTICAL BASES>.

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First and most important, -visualize- the forking piece attacking the <TACTICAL TARGET> by -occupying- the <TACTICAL BASE>.

Then every square and line that can be reached from the <TACTICAL BASE> must be considered as a potential second <TACTICAL TARGET> for a <DOUBLE ATTACK>.

Position after 26 ... f7-f5?:


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Position after 27 ♘e4-g5!:


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27 Ne4-g5! Dlugy visualizes White d6-knight on f7-TACTICAL BASE (Nd6-f7+ CHECK is TACTICAL TARGET)

Event "ICC 3 0"
Site "Internet Chess Club"
Date "2007.12.24"
Round "-"
White "Dlugy"
Black "CK-324"
Result "1/2-1/2"
ICCResult "White ran out of time and Black has no material to mate" WhiteElo "3111"
BlackElo "3116"
Opening "Queen's pawn game"
ECO "A50"
NIC "QP.07"
Time "05:11:26"
TimeControl "180+0"

1. d4 Nf6 2. c4 c6 3. Bf4 d5 4. e3 Bf5 5. Nc3 e6 6. Qb3 Qc8 7. Rc1 dxc4 8. Bxc4 Nbd7 9. e4 Bg6 10. e5 Ng4 11. h3 Nh6 12. g4 Nb6 13. Be2 Ng8 14. h4 h5 15. gxh5 Bxh5 16. Bxh5 Rxh5 17. Nge2 Ne7 18. Ng3 Rh7 19. h5 Ned5 20. Bg5 Qd7 21. Nce4 Bb4+ 22. Kf1 Be7 23. Bxe7 Qxe7 24. Nd6+ Kd8 25. a4 a5 26. Nge4 f5 27. Ng5 Rh6 28. Ngf7+ Kc7 29. Nxh6 gxh6 30. Rg1 Rf8 31. Rg6 Nf4 32. Rxh6 Qg7 33. Rg6 Nxg6 34. Qg3 Qh6 35. Rd1 Ne7 36. Ke2 Nbd5 37. Rh1 f4 38. Qb3 f3+ 39. Kd1 b6 40. Qd3 Rf4 41. Rh3 Nf5 42. Nxf5 exf5 43. Rxf3 Qxh5 44. Ke2 Qg4 45. e6 Re4+ 46. Kf1 Rxe6 47. Qxf5 Qxf5 48. Rxf5 Kd6 49. b3 c5 50. dxc5+ bxc5 51. Rh5 Re4 52. Rh6+ Ke5 53. Rc6 Rb4 54. Rxc5 Rxb3 55. Rxa5 Ke4 56. Ra8 Nf4 57. Re8+ Kf3 58. Re7 Rb1+ 59. Re1 Rxe1+ 60. Kxe1 Nd3+ 61. Kd2 Nxf2 62. Kc3 Ne4+ 63. Kd4 Kf4 64. a5 Nd6 65. Kd5 Nb5 66. Kc5 Na7 67. Kb6 Nc8+ 68. Kb7 Nd6+ 69. Kc7 Ke5 70. Kc6 Nb5 71. a6 Na7+ 72. Kb7 Nc8
1/2-1/2


Black e5-bishop has White e1-queen tactical target, g3 base
Kotov vs Geller, 1949 
(E67) King's Indian, Fianchetto, 40 moves, 0-1

22 - Rd1xNf1! undefended White b1-rook, d3-square tactical base
Naiditsch vs Mamedyarov, 2003 
(C68) Ruy Lopez, Exchange, 30 moves, 0-1

56 Re5!! Black h6-king tactical target, g4-square tactical base
Anand vs Morozevich, 2007 
(B90) Sicilian, Najdorf, 56 moves, 1-0

41 - g3+! White c1-rook tactical target,e2-square tactical base
C Lutz vs Kasparov, 2002 
(B84) Sicilian, Scheveningen, 42 moves, 0-1

31 Rd7! Black g8-king tactical target, f6-square tactical base
J M Hodgson vs Hebden, 1986 
(A45) Queen's Pawn Game, 36 moves, 1-0

37 d5-d6+! Black e5-queen, e7-king are both(!) tactical targets
Kasparov vs Karpov, 1986 
(C92) Ruy Lopez, Closed, 41 moves, 1-0

20 Rf1xf6! undefended Black a8-rook creates f3-tactical base
Tarrasch vs Pillsbury, 1898 
(C49) Four Knights, 46 moves, 1-0

18 ... Qe6xBc4! Black visualizes g4-knight on e3-tactical base
Steinitz vs J Minckwitz, 1870 
(C25) Vienna, 18 moves, 0-1

20 .. Qb4-b2! Black visualizes f4-knight on d3-tactical base
Ljubojevic vs Morozevich, 2003 
(D07) Queen's Gambit Declined, Chigorin Defense, 43 moves, 0-1

30 Rg6-g7! Capa visualizes White h5-queen on g5-tactical base
Capablanca vs Janowski, 1918 
(D30) Queen's Gambit Declined, 30 moves, 1-0

21 Bf4-b8! Kasim visualizes White d2-queen on d6-tactical base
Kasimdzhanov vs Karpov, 2007 
(E37) Nimzo-Indian, Classical, 33 moves, 1-0

26 Bf4-c7!! Spassky visualizes White e2-queen, e5-tactical base
Spassky vs Averkin, 1973 
(B44) Sicilian, 35 moves, 1-0

17 Qf3-e4! loose Black e7-bishop makes bases of e-file squares
J Ludwig vs C Lohrie, 2005 
(C44) King's Pawn Game, 16 moves, 1-0

37 Nd5-f6! Vasiukov visualized his White g3-queen on f3-base
Vasiukov vs Taimanov, 1965 
(B40) Sicilian, 44 moves, 1-0

28 ... Bg7-d4+! Magnus visualizes Black c3-knight on e2-base
Mamedyarov vs Carlsen, 2007 
(A57) Benko Gambit, 58 moves, 0-1

Black f6-bishop has h2-luft tactical target, e5-tactical base
G Mammadova vs O Girya, 2001 
(B22) Sicilian, Alapin, 35 moves, 0-1

25 Rd7xf7! Chucky visualize White a6-queen on a7-tactical base
Ivanchuk vs Ponomariov, 2007 
(A04) Reti Opening, 59 moves, 1-0

24 Re1-e8! White visualizes White d5-knight on f6-tactical base
P Chan vs Wu Kaiyu, 2001 
(B05) Alekhine's Defense, Modern, 24 moves, 1-0

53 ... Rd5-d1! Kamsky visualized Black c4-knight on e3-base
B Avrukh vs Kamsky, 2007 
(A64) Benoni, Fianchetto, 11...Re8, 53 moves, 0-1

33 f6-f7! Kramnik visualized White f4-knight on g6-base
Kramnik vs Nunn, 1992 
(E81) King's Indian, Samisch, 33 moves, 1-0

31 Rg5xg7+! Polgar visualizes White e5-pawn on f6-tactical base
Judit Polgar vs Korchnoi, 2006 
(C12) French, McCutcheon, 39 moves, 1-0

15 Nd4xc6! Fischer visualizes White c4-pawn on d5-tactical base
Fischer vs P Lapiken, 1956 
(A04) Reti Opening, 19 moves, 1-0

37 ... Ra3xa2! Petrosian visualizes Black b4-pawn on b3-base
Snilga vs Petrosian, 1946 
(B13) Caro-Kann, Exchange, 46 moves, 0-1

38 Nf4xh5! Radja visualizes White g3-pawn on g4-tactical base
Radjabov vs D Zoler, 2006 
(E11) Bogo-Indian Defense, 49 moves, 1-0

Black c5-knight has White g3-knight tactical target, defends f6
Carlsen vs Eljanov, 2008 
(D91) Grunfeld, 5.Bg5, 54 moves, 1-0

38 - c4-c3+! Black f6-knight has White d2-queen target, e4 base
Vaganian vs Short, 1989 
(D35) Queen's Gambit Declined, 53 moves, 0-1

56 ... b4-b3! Carlsen visualized Black f3-knight on d2-base
Kramnik vs Carlsen, 2008 
(A30) English, Symmetrical, 57 moves, 0-1

29 Rg2-g5!! White e5-knight has tactical target Black d6-king
Aronian vs Stefansson, 2004 
(D45) Queen's Gambit Declined Semi-Slav, 40 moves, 1-0

13 Rd1-d8+! undefended Black h8-rook makes f7 a tactical base
Anand vs N Sulava, 2004 
(C10) French, 17 moves, 1-0

49 Rg3xg6! undefended Black e2-rook makes h5-sq tactical base
Leko vs Kramnik, 2007 
(C78) Ruy Lopez, 49 moves, 1-0

19 Ne4-f6+! loose Black a4-rook, c2-square tactical base
Ivanchuk vs Leko, 2007 
(C45) Scotch Game, 27 moves, 1/2-1/2

20 ... Ne5xf3! undef White a1-rook makes f6-sq a tactical base
Van Wely vs Aronian, 2008 
(D80) Grunfeld, 34 moves, 0-1

13 Bc4xf7+! undef Black b7-bishop makes b3-sq tactical base
Zsuzsa Polgar vs E Ivanov, 1981 
(A57) Benko Gambit, 15 moves, 1-0

19 Ne4-d6!! Black d8-king give White e5-knight f7-tactical base
Short vs Timman, 2008 
(C67) Ruy Lopez, 40 moves, 0-1

16 ... Qg6-c2+! e6-knight has tactical target undef f3-queen
J Smeets vs Adams, 2008 
(C45) Scotch Game, 28 moves, 0-1

21 Bd4-g7 undef Black b4-rook makes c3-base for White g3-queen
Kamsky vs Mamedyarov, 2008 
(B46) Sicilian, Taimanov Variation, 40 moves, 0-1

44 Rf4-f5! White e4-knight has Black e8-king target, d6-base
Judit Polgar vs I Sokolov, 2003 
(C92) Ruy Lopez, Closed, 44 moves, 1-0

19 Qb3xb7! White c4-knight has Black e8-king target, d6-base
Kasparov vs Ulf Andersson, 1985 
(E04) Catalan, Open, 5.Nf3, 40 moves, 1-0

39 Rd8-g8+! undef Black c7-rook makes d8-tact base for g5-queen
M Rodshtein vs I Caspi, 2008 
(E94) King's Indian, Orthodox, 39 moves, 1-0

49 .. Qe1xRf2+! undef White d6-queen make e4-base for f6-knight
D Flores vs Radjabov, 2005 
(A26) English, 49 moves, 0-1

34 Re1-e7! based on undef Black c8-rook making f5 a forking sq
Fischer vs F Olafsson, 1960 
(B52) Sicilian, Canal-Sokolsky (Rossolimo) Attack, 42 moves, 1-0

41 ... Qd5-g5+ undefended White f4-rook makes g5-tactical base
Ivanchuk vs Radjabov, 2009 
(E97) King's Indian, 41 moves, 0-1

35 ... Bd4xb2+! undefended White f1-rook makes c4-tactical base
Sasikiran vs Kasimdzhanov, 2009 
(D11) Queen's Gambit Declined Slav, 35 moves, 0-1

22 Rf1xf7+! 1-1 loose Black b7-bishop greates b3-tactical base
Rublevsky vs Navara, 2007 
(C28) Vienna Game, 35 moves, 1-0

38 .. Rb2xBf2+! undef White d6-rook makes e4-base for f6-knight
Bakhmatov vs E Ghaem Maghami, 2005 
(B87) Sicilian, Fischer-Sozin with ...a6 and ...b5, 38 moves, 0-1

41 ... a3-a2! undefended White c6-bishop makes b4-tactical base
Piket vs Kasparov, 1999 
(E12) Queen's Indian, 41 moves, 0-1

34 ... Qe7-g5? undef g5-queen gives White d6-knight f7-base
Anand vs Leko, 2009 
(C95) Ruy Lopez, Closed, Breyer, 36 moves, 1-0

30 ... Nh7-f6 Black f6-knight becomes target for White f4-pawn
A Korobov vs I Cheparinov, 2010 
(E93) King's Indian, Petrosian System, 61 moves, 1/2-1/2

J Jirka vs Tkachiev, 2009 
(A42) Modern Defense, Averbakh System, 23 moves, 0-1

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