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ACTS: ALIGNMENTS CREATE THREATENED SQUARES!
Compiled by notyetagm
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Your pieces are -NOT- safe if they are in <ALIGNMENTS/CONFIGURATIONS>: files, diagonals, ranks, pawn forks, knight forks, king forks.

Your pieces are <LINED UP>, that is, your pieces are in an <ALIGNMENT>, if an enemy piece can exploit the <SQUARES> on which those pieces reside. And then it's a simple matter of <ACTS - ALIGNMENTS CREATE THREATENED SQUARES>.

In the Greenfeld-Daly Irish Ch. (9) 2008 game, the White c2-rook and White f3-queen -ARE- <LINED UP> via the e4-square because the light-squared Black b7-bishop on that e4-square can exploit the fact that the White rook and queen are on the c2- and f3-squares, respectively.

And in Adams-Bareev Corus 2004, the Black c8-rook and Black g8-king are <LINED UP/MAKE AN ALIGNMENT> because a White bishop on the e6-square can attack both of those Black pieces on the squares on which they reside (c8 and g8) (♖e1xe6! 1-0 <reload>).

Of these <ALIGNMENTS/CONFIGURATIONS> the most dangerous is the <KNIGHT FORK ALIGNMENT> when an enemy knight is located nearby or is centralized. See the games Topalov vs Nisipeanu, 2007 (White d3-queen + White g2-king with Black d5-,e6-knights) and A G Aleksandrov vs Adams, 2002 (White h3-queen + h1-king with Black g4-knight) for examples of this particular <ALIGNMENT/CONFIGURATION>.

36 - Nh5xg3! White f2-queen,e1-rook > f4-bishop skewer on g3-sq
Carlsen vs Ivanchuk, 2008 
(E97) King's Indian, 46 moves, 1-0

30 Re1xBe6! Black d4-rook,g7-king makes e6 a knight fork square
Ivanchuk vs Svidler, 2008
(A48) King's Indian, 31 moves, 1-0

44 ... Re6-d6 makes knight fork alignment with f5, 45 Bd3xf5!
Ivanchuk vs B Grachev, 2008 
(B40) Sicilian, 47 moves, 1-0

31 Nc3-b5! Black d7-queen,e8-king > c6-pinning sq for e2-bishop
Ivanchuk vs Grischuk, 2008 
(D12) Queen's Gambit Declined Slav, 48 moves, 1-0

31 Qc2-d3? knight fork alignment White d3-queen + White h1-king
Mamedyarov vs Anand, 2008 
(B20) Sicilian, 42 moves, 0-1

14 - Qd8-c7? Black c7-queen,f6-bishop lined up for Nc3-d5 fork
Anand vs J Ye, 1989 
(B81) Sicilian, Scheveningen, Keres Attack, 31 moves, 1-0

36 Rh5-e5! undef Black c7-rook + Black h8-king via e5-base
Aronian vs Sutovsky, 2007 
(A31) English, Symmetrical, Benoni Formation, 37 moves, 1-0

43 Qe4-d3? knight fork alignment White d3-queen + White g2-king
Topalov vs Nisipeanu, 2007 
(B01) Scandinavian, 47 moves, 0-1

20 ... Ne5-d3? alignment with d6-king makes d4 a forking square
A David vs Rozentalis, 2008 
(D20) Queen's Gambit Accepted, 21 moves, 1-0

27 Qa2-a3! undefended d7-bishop + g7-king = e7-forking square
Capablanca vs Euwe, 1931 
(D17) Queen's Gambit Declined Slav, 35 moves, 1-0

38 ... Bb7xe4 White c2-rook,f3-queen lined up via e4-forking sq
A Greenfeld vs C Daly, 2008 
(A48) King's Indian, 37 moves, 1/2-1/2

28 Nc3-e2 makes pawn fork alignment e2-knight + g2-knight
Pinter vs Nunn, 1988 
(E99) King's Indian, Orthodox, Taimanov, 46 moves, 0-1

16 Nf3xe5! Black e7-bishop + c7-queen makes c6 pawn fork square
Capablanca vs Vidmar, 1927 
(C98) Ruy Lopez, Closed, Chigorin, 37 moves, 1-0

44 ... Ba8-d5? makes knight fork alignment with Black g6-king
E Alekseev vs Carlsen, 2008 
(E15) Queen's Indian, 47 moves, 1/2-1/2

28 Rf2-c2? makes a knight fork alignment with White g2-king
Doroshkievich vs Tal, 1975 
(E77) King's Indian, 28 moves, 0-1

15 Nd4-c6!! due to alignment of Black a8-rook,d7-queen,e8-king
Salov vs J M De La Villa Garcia, 1987 
(A46) Queen's Pawn Game, 26 moves, 1-0

25 Kg3-h1 makes White h1-king + h3-queen knight fork alignment
A G Aleksandrov vs Adams, 2002 
(E55) Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation, 35 moves, 0-1

35 ... Nd4-f3+! White e1-,h4-rooks are in knight fork alignment
Anand vs Ivanchuk, 2007 
(B42) Sicilian, Kan, 37 moves, 0-1

27 - Nd3-f4+! exploits alignment White e2-queen + White g2-king
F Bindrich vs Z Andriasian, 2007 
(D30) Queen's Gambit Declined, 27 moves, 0-1

33 .. Re8-e6? makes a knight fork alignment with Black b7-queen
Tal vs K Klaman, 1957 
(B61) Sicilian, Richter-Rauzer, Larsen Variation, 7.Qd2, 34 moves, 1-0

44 ... Kc5-d4? Black d4-king makes KFA with undef Black a1-rook
Lasker vs Duras, 1909  
(D26) Queen's Gambit Accepted, 54 moves, 1-0

63 Qe2-e3? lines up with g1-king, creates b6-pinning square
E Inarkiev vs Kasimdzhanov, 2008 
(C92) Ruy Lopez, Closed, 86 moves, 0-1

16 Nd4-e6+! Black g5-queen + f8-king create e6-tactical base
F Vallejo Pons vs I Nepomniachtchi, 2008 
(B23) Sicilian, Closed, 25 moves, 1-0

32 Re1xNe5! Black d7-rook,f7-king make e5 a knight fork square
Sutovsky vs Sakaev, 2001 
(C14) French, Classical, 63 moves, 1-0

32 Rc8xNc6! Black c6-knight + Black f7-king = e5-tactical base
R Mamedov vs S Feller, 2008 
(C10) French, 32 moves, 1-0

22 Rc3xc4? Nd5-c3! alignment of White e2-queen + White d1-rook
O Bernstein vs Capablanca, 1914 
(D63) Queen's Gambit Declined, Orthodox Defense, 29 moves, 0-1

34 Re1-e7! Black h7-king lined up with undef c8-rook via f5-sq
Fischer vs F Olafsson, 1960 
(B52) Sicilian, Canal-Sokolsky (Rossolimo) Attack, 42 moves, 1-0

T Hillarp Persson vs W So, 2009 
(D11) Queen's Gambit Declined Slav, 39 moves, 0-1

59 f4-f5?? White g5-king + h6-queen make e3 a skewering square
Caruana vs Short, 2009 
(E06) Catalan, Closed, 5.Nf3, 67 moves, 1-0

18 Qf3xf7+! Black c7-queen + g7-king makes e6-forking square
Nunn vs S Swanson, 1974 
(B06) Robatsch, 18 moves, 1-0

24 ... Qd6-d5? makes knight fork alignment with Black e8-king
Botvinnik vs Robatsch, 1966 
(D35) Queen's Gambit Declined, 24 moves, 1-0

20 Bd3xb5! Black d6-,a7-rooks make b5-base for White c3-knight
Kramnik vs Short, 2008 
(D07) Queen's Gambit Declined, Chigorin Defense, 47 moves, 1-0

52 .. Na5-b7?? lines up with Black f7-king making c7-forking sq
Rubinstein vs Tarrasch, 1922 
(D34) Queen's Gambit Declined, Tarrasch, 53 moves, 1-0

21 - Qd8xg5? lines up with Black e5-knight for fork 22 f3-f4!+-
Ivanchuk vs Anand, 2007 
(E37) Nimzo-Indian, Classical, 23 moves, 1-0

42 Ke2xf3 Re8-f8+! pins White f7-queen to newly aligned f3-king
Morozevich vs Kramnik, 2009 
(E32) Nimzo-Indian, Classical, 45 moves, 0-1

39 Re3-e1? lines up with White h2-king to make f3-knight base
I E Morovic-Fernandez vs Rublevsky, 2009 
(D20) Queen's Gambit Accepted, 39 moves, 0-1

29 Qf4-d2?! lines up with White g1-king to make f3-knight base
Nisipeanu vs A Giri, 2010 
(C42) Petrov Defense, 31 moves, 0-1

Nakamura vs Ni Hua, 2009 
(D11) Queen's Gambit Declined Slav, 46 moves, 1/2-1/2

Bareev vs M Tosic, 2010 
(D16) Queen's Gambit Declined Slav, 28 moves, 1-0

Karpov vs Kasparov, 1986 
(D92) Grunfeld, 5.Bf4, 21 moves, 1/2-1/2

26 ... Nf6-f7??
O'Kelly vs J H Donner, 1950 
(A40) Queen's Pawn Game, 42 moves, 1-0

25 Qc1-c2?? creates a knight fork alignment with White g1-king
P Nikolic vs Ivanchuk, 1995 
(D27) Queen's Gambit Accepted, Classical, 25 moves, 0-1

D E Cori Tello vs A Muzychuk, 2010 
(E10) Queen's Pawn Game, 37 moves, 1-0

32 ... Ne8-d6?! makes pawn fork alignment wth b6-rook, 34 Rc5!!
Y Shulman vs Kamsky, 2010 
(D11) Queen's Gambit Declined Slav, 66 moves, 1/2-1/2

31 ... Qc8-d7?? makes alignment with f7-king, makes e5 fork sq
W So vs Navara, 2011 
(D76) Neo-Grunfeld, 6.cd Nxd5, 7.O-O Nb6, 34 moves, 1-0

63 Bf2-e1!
Leko vs S Shankland, 2011 
(D45) Queen's Gambit Declined Semi-Slav, 66 moves, 0-1

17 Ra1-c1?? turns a2-,d3-squares into knight fork squars
D Andreikin vs Ivanchuk, 2011 
(B10) Caro-Kann, 32 moves, 0-1

Loose e6-,e5-knights make e8-skewering square, 46 Ra2-a8+! +-
Kamsky vs I Nepomniachtchi, 2011 
(A00) Uncommon Opening, 52 moves, 1-0

38 Kh1-g2??
D Bocharov vs A Reshetnikov, 2011 
(A35) English, Symmetrical, 38 moves, 0-1

V Belous vs H Pasalic, 2012 
(E81) King's Indian, Samisch, 33 moves, 1-0

g5-pinning sq
D Andreikin vs Tomashevsky, 2013 
(D15) Queen's Gambit Declined Slav, 42 moves, 1-0

17 Rf1xf7+! 1-0 e6-sq must be defended because of g7-K & d8-Q
Kmoch vs Prins, 1940 
(D97) Grunfeld, Russian, 17 moves, 1-0

D Harika vs A Rudolf, 2017 
(A11) English, Caro-Kann Defensive System, 33 moves, 0-1

53 games

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