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LOOKOUT FOR UNDEFENDED PIECES! TACTICAL TARGETS!
Compiled by notyetagm
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A great example of this tactical theme by Nakemura (smallville).

White to play: 30 ?
FENFENFEN

Black's last move was the blunder 29 ... ♘b6-a4??, leaving the Black a4-knight <UNDEFENDED>. Nakamura (White) immediately saw this <UNDEFENDED> Black a4-knight as a <TACTICAL TARGET>, having the c6-square as the <TACTICAL BASE> by which the White g2-bishop attacks the <UNDEFENDED> Black a4-knight <TACTICAL TARGET>.

Only the Black b7-pawn <DEFENDS> the c6-tactical base. So Nakamura played 30 ♘a5xb7!, <REMOVING THE GUARD> by capturing the <BASE OF THE PAWN CHAIN>.

Position after 30 ♘a5xb7! +-
FENFENFEN

The tactical point of Nakamura's play is that after 30 ... ♖d7x♘b7 31 ♗g2xc6 the light-squared White c6-bishop <FORKS> both the <UNDEFENDED> Black a4-knight -AND- the <UNDEFENDED> Black b7-rook from the c6-tactical base, winning material.

Position after 30 ... ♖d7x♘b7 31 ♗g2xc6 <bishop fork> FENFENFEN

This is the position that Nakamura instantly saw when he played 30 ♘a5xb7!, the White c6-bishop on its <TACTICAL BASE> (the c6-square) from which it <FORKS> its two <TACTICAL TARGETS>, the two <UNDEFENDED> Black pieces on a4 and b7.

Event "ICC 1 0"
Site "Internet Chess Club"
Date "2008.06.29"
Round "-"
White "Smallville"
Black "sovaco"
Result "1-0"
ICCResult "Black resigns"
WhiteElo "2914"
BlackElo "2220"
Opening "Caro-Kann: two knights, 3...Bg4" ECO "B11" NIC "CK.01" Time "02:13:12" TimeControl "60+0"

1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h3 Bxf3 5. Qxf3 e6 6. Qe2 Qe7 7. g3 g6 8. Bg2 Bg7 9. O-O Nf6 10. Re1 d4 11. Nb1 O-O 12. d3 Nfd7 13. f4 Na6 14. Nd2 Nc7 15. Nf3 Nb6 16. e5 Ncd5 17. Nxd4 Rad8 18. Qf2 Qc5 19. Nb3 Qxf2+ 20. Kxf2 Nb4 21. Re2 N6d5 22. a3 Na6 23. c4 Ndc7 24. d4 Rd7 25. Be3 Rfd8 26. Rc1 Bf8 27. Na5 Na8 28. b4 Nb6 29. Rec2 Na4 30. Nxb7 Rxb7 31. Bxc6 Rc7 32. Bxa4 Rdc8 33. b5 Nb8 34. c5 Rd8 35. Bb3 Rdc8 36. a4 Rd8 37. g4 Rdc8 38. a5 Rd8 39. c6 Rdc8 40. a6 Be7 41. Kf3 Ba3 42. Rg1 Be7 43. Ke4 Kf8 44. f5 Nxc6 45. bxc6 Rxc6 46. Rxc6 Rxc6 47. fxe6 fxe6 48. Rf1+ Kg7 49. Ba4 Rxa6 50. Be8 Ra2 51. Rf7+ Kg8 52. Bh6 Bb4 53. Rb7 Ba3 54. Bf7+ ♗lack resigns 1-0

13 Bc4xf7+! undef Black b7-bishop makes b3 base for c2-queen
S Polgar vs E Ivanov, 1981 
(A57) Benko Gambit, 15 moves, 1-0

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

43 ... Bc6-a4? undef a4-bishop makes e4-square a tactical base
Y Hou vs D Howell, 2008 
(C96) Ruy Lopez, Closed, 61 moves, 1/2-1/2

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

45 Rc2xBc4+! due to undef Black a1-rook, c2-tactical base
Lasker vs Duras, 1909  
(D26) Queen's Gambit Accepted, 54 moves, 1-0

22 Qa8-a7! undef Black f2-knight forked with loose e7-square
Tal vs Larsen, 1979 
(B63) Sicilian, Richter-Rauzer Attack, 22 moves, 1-0

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

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

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

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

41 .. a3-a2! undef White c6-bishop is target of Black d3-knight
Piket vs Kasparov, 1999 
(E12) Queen's Indian, 41 moves, 0-1

31 .. Ra2xBd2! possible due to undef White e7-rook, fork threat
Buhmann vs Shirov, 2008 
(D12) Queen's Gambit Declined Slav, 31 moves, 0-1

12 ... Bg7-d4! Black b4-knight has target undef White a1-rook
Karpov vs Carlsen, 2009 
(D72) Neo-Grunfeld, 5.cd, Main line, 32 moves, 0-1

35 ... Ng4xh2+! undef c1-bishop turns c4-sq into tactical base
L J Bernal Moro vs Sengupta, 2013 
(A09) Reti Opening, 37 moves, 0-1

I Krush vs S Khukhashvili, 2012 
(A41) Queen's Pawn Game (with ...d6), 66 moves, 0-1

15 games

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