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yy_Fortress built-up
Compiled by whiteshark
--*--

In chess, the fortress is an endgame drawing technique in which the side behind in material sets up a zone of protection around their king that cannot be penetrated by the opponent. This only works when the opponent does not have a passed pawn or cannot create one, unless that pawn can be stopped (e.g. see the opposite-colored bishops example). An elementary fortress is a theoretically drawn (i.e. a book draw) position with reduced material in which a passive defense will maintain the draw (Müller & Pajeken 2008:183). Fortresses commonly have four characteristics:
Useful pawn breakthroughs are not possible
If the stronger side has pawns, they are firmly blocked The stronger side's king cannot penetrate, either because it is cut off or near the edge of the board Zugzwang positions cannot be forced, because the defender has waiting moves available (de la Villa 2008:23). Fortresses pose a problem for computer chess: computers are unable to reason about fortress-type positions except to the extent that their endgame tablebase allows.

Wikipedia article: Fortress (chess) (check for further examples)

Q:R - 1:2||
M Bezold vs M Boeykens, 2002 
(A01) Nimzovich-Larsen Attack, 64 moves, 1-0

Q:Rp Fortress
Zhu Chen vs S Petrenko, 2001 
(D85) Grunfeld, 133 moves, 1/2-1/2

Qpp: Rppp|| break-up
G Meier vs T Sanikidze, 2010
(A14) English, 63 moves, 0-1

Qp:Rp
Averbakh vs Bondarevsky, 1948 
(C92) Ruy Lopez, Closed, 74 moves, 1/2-1/2

Q:R didn't work
J Friedel vs Serper, 2006
(B43) Sicilian, Kan, 5.Nc3, 75 moves, 1-0

Q2:R4 - break up
Naiditsch vs W So, 2012 
(C42) Petrov Defense, 54 moves, 1-0

Q-sac to built-up a fortress
A Petrosian vs L Hazai, 1970 
(E80) King's Indian, Samisch Variation, 55 moves, 1/2-1/2

Q: RBP-fortress
Kramnik vs Wang Hao, 2012 
(E10) Queen's Pawn Game, 89 moves, 1/2-1/2

Q:RBP
Gelfand vs M M Kazhgaleyev, 2012
(D10) Queen's Gambit Declined Slav, 59 moves, 1/2-1/2

Q:RB
Nunn vs I Farago, 1987 
(C19) French, Winawer, Advance, 48 moves, 1/2-1/2

Q:R - 2:2||
Salov vs Korchnoi, 1997 
(E10) Queen's Pawn Game, 81 moves, 1/2-1/2

Q:R - 2:3||
M Wach vs Korchnoi, 1997 
(C18) French, Winawer, 55 moves, 1/2-1/2

Q:RPP break-up
S Rocha vs S Kristjansson, 2002
(C18) French, Winawer, 84 moves, 1-0

Q:R - 1:1||
Van Wely vs K Bischoff, 1994
(A10) English, 66 moves, 1/2-1/2

Q,1-2 vs RN,1-3
Gelfand vs Anand, 2012 
(E54) Nimzo-Indian, 4.e3, Gligoric System, 49 moves, 1/2-1/2

Q:R 2:3||
Korchnoi vs Y Sakharov, 1965
(A07) King's Indian Attack, 75 moves, 1-0

QP vs RPPP --> Fortress
Z Almasi vs Robson, 2010
(A13) English, 75 moves, 1/2-1/2

Q:R (1:3||)
Bacrot vs Carlsen, 2009 
(D44) Queen's Gambit Declined Semi-Slav, 46 moves, 1/2-1/2

Q2:R3||
K Miton vs Joel Benjamin, 2005 
(A46) Queen's Pawn Game, 72 moves, 1-0

Q1:R2|| - fortress
M Sibilio vs N Paltrinieri, 2014 
(A40) Queen's Pawn Game, 50 moves, 1/2-1/2

Q+2:R+2||
Z Stanojoski vs G Guseinov, 2008 
(B32) Sicilian, 48 moves, 0-1

QR:RRBp
A Giri vs Jakovenko, 2014 
(A30) English, Symmetrical, 48 moves, 1/2-1/2

Q : R+(a+b)
Le Quang Liem vs M Rodshtein, 2006
(D07) Queen's Gambit Declined, Chigorin Defense, 56 moves, 1/2-1/2

Q:R2p
Larsen vs Korchnoi, 1981 
(B83) Sicilian, 60 moves, 1/2-1/2

Q:R+N
Korchnoi vs Ljubojevic, 1972 
(A42) Modern Defense, Averbakh System, 112 moves, 1/2-1/2

Q2:R3||
Reshevsky vs J Hickl, 1986 
(A56) Benoni Defense, 67 moves, 1/2-1/2

Q3:R3|| - pin breaks fortress
R Bertholee vs Judit Polgar, 1990 
(A35) English, Symmetrical, 43 moves, 0-1

missed one
A Neiksans vs E Inarkiev, 2016 
(A25) English, 79 moves, 0-1

Q:Rp
Taran Jina vs M Grigoryan, 2016
(A08) King's Indian Attack, 110 moves, 1/2-1/2

RB6:RN5
Hjartarson vs L'Ami, 2017 
(A81) Dutch, 37 moves, 1/2-1/2

B5:N5
Smirin vs HIARCS, 2002 
(A30) English, Symmetrical, 60 moves, 1/2-1/2

Qpp(h):R+P(f)
C Lupulescu vs Navara, 2017 
(A33) English, Symmetrical, 114 moves, 1/2-1/2

Q+2 : BBp+2||
Adorjan vs Csom, 1985
(A30) English, Symmetrical, 59 moves, 1/2-1/2

Q1:R4 failed
H Tikkanen vs E Berg, 2012 
(D05) Queen's Pawn Game, 58 moves, 0-1

88.Nxd5! Bxd5 89.Bd4 would have built a (stalemate) fortress.
J Maiwald vs K Bischoff, 1997 
(B50) Sicilian, 89 moves, 0-1

Q3:R3||+a
P Clarke vs Fazekas, 1956
(C43) Petrov, Modern Attack, 80 moves, 1/2-1/2

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