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DEPEND on =YOUR= pieces to block critical lines
Compiled by notyetagm
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If it is critical that a line stay <BLOCKED> (closed), and there are pieces of both colors currently occupying the line, then the =defender= must depend upon =HIS= pieces to keep that line closed because the opponent can always move his pieces off of that line with tempo (forcing moves).

What this means is that the defender's pieces must perform the task of <BLOCKING> the critical line so that they cannot perform another one. The <OBLIGATION> to <BLOCK> the crucial line <RESTRICTS> the <MOBILITY> of the piece/pawn performing this task.

36 ... Nh4+! White depends upon the g3-pawn to block g-file
Leko vs Grischuk, 2003 
(C84) Ruy Lopez, Closed, 36 moves, 0-1

18 ... Qe7-d6 Black depends on his e6-pawn to block e-file
Capablanca vs Alekhine, 1913 
(D30) Queen's Gambit Declined, 35 moves, 1-0

(VAR) 23 QxQc7+ Black depends on his e5-bishop to block e-file
G Vescovi vs Karpov, 2004 
(C10) French, 22 moves, 1-0

34 RxNe4! Black must depend on -his- f5-pawn to block 5th rank
J Stocek vs Eingorn, 1998 
(C03) French, Tarrasch, 36 moves, 1-0

35 ... Bf3! White depends on e2-rook to keep the e-file closed
Carlsen vs Ljubojevic, 2006 
(C11) French, 35 moves, 1/2-1/2

35 ... Re2+! White d3-queen blockades d4-pawn to block a1-h8
Mamedyarov vs Kamsky, 2007 
(D10) Queen's Gambit Declined Slav, 38 moves, 1-0

17 ... Ne5-g4! White f3-pawn blocks a8-h1, not Black d5-knight
Ponomariov vs Grischuk, 2000 
(C45) Scotch Game, 46 moves, 0-1

Black g6-bishop BLOCKS g-file, does not attack White d3-knight
I Nei vs Petrosian, 1960 
(A56) Benoni Defense, 33 moves, 1-0

32 ... g7xf6 forced since Black f5-rook BLOCKS b1-h7 diagonal
Van Wely vs Judit Polgar, 2007 
(E17) Queen's Indian, 40 moves, 0-1

11 Qb3 possible, Black depends on his e6-bishop to block e-file
Reti vs Lasker, 1908 
(C56) Two Knights, 15 moves, 0-1

49 ... Nd3xe5! White depends on his d4-pawn to block d-file
Shirov vs Ivanchuk, 2005 
(C02) French, Advance, 52 moves, 0-1

35 Rd1xBd5! Black depends on e6-pawn to block e-file to e8-king
Kasparov vs Kramnik, 1999 
(B62) Sicilian, Richter-Rauzer, 36 moves, 1-0

19 ... Nf6xe4! White depends on his f3-pawn to block line f7-f2
Lasker vs Steinitz, 1896 
(C71) Ruy Lopez, 30 moves, 0-1

Qa4xc6+! Black must depend on Black e7-knight to block e-file
Fischer vs Geller, 1961 
(C72) Ruy Lopez, Modern Steinitz Defense, 5.O-O, 22 moves, 1-0

14 games

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