Fortresses

Discussion of anything and everything relating to chess playing software and machines.

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Nordlandia
Posts: 2821
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Fortress / Positional draw

[pgn][Event "1st Prize, EBUR {m}"]
[Site "?"]
[Date "2003.??.??"]
[Round "?"]
[White "Costeff, Gady"]
[Black "Draw"]
[Result "*"]
[SetUp "1"]
[FEN "3n4/1P3ppp/3q3k/4p1pP/4PpP1/8/4P1BP/4QK2 w - - 0 1"]
[PlyCount "59"]
[EventDate "2003.??.??"]

1. Qb1 (1. Bf3 Nxb7 2. Kg2 Qd4 3. Qf2 Nd6 4. Kf1 Nc4 5. h3 Ne3+ 6. Kg1 g6 7.
hxg6 Kxg6 8. Kh1 Kf6 9. Qe1 Qd1 10. Qxd1 Nxd1 11. Kg1 Ke6 12. Kf1 Kd6 13. Ke1
Ne3 14. Kd2 Kc5 15. Kc3 f6 16. Kd3 Kb4 17. Bh1 Kb3 18. Bf3 h6 19. Bh1 Kb2 20.
Kd2 (20. Bf3 Kc1 21. Kc3 Kd1 22. Kb4 Nc2+ 23. Kc5 Nd4 24. Kd6 Nxf3 25. exf3 Ke2
26. Ke6 Kxf3 27. Kxf6 Kxe4) 20... Nf1+ 21. Kd3 (21. Ke1 Ng3 22. Bf3 Kc3) 21...
Kc1) (1. e3 Nxb7 2. exf4 gxf4 3. h4 f6 4. Bf3 Nc5 5. Qb4 Qd3+ 6. Kg2 Qc2+ 7.
Kg1 Qb3 8. Qxb3 Nxb3 9. Kf2 Nd4 10. Bd1 g5 11. hxg6 Kxg6 12. Ba4 h6 13. Be8+
Kg7 14. h5 Kf8 15. Bd7 Ke7 16. Bc8 Kd6 17. Bb7 Kc5 18. Bd5 Nb5) 1... Qb8 2.
Qb6+ (2. Bf3 Qxb7 3. Qxb7 Nxb7 4. Ke1 Nd6 5. Kd2 Nc4+ 6. Kc3 Ne3 7. Kb4 g6 8.
hxg6 fxg6 9. Kc5 Kg7 10. Kd6 Kf6 11. Kd7 Nf1 12. h3 Ne3 13. Kd6 Nd1 14. Kd5 Nf2
15. Bg2 (15. h4 gxh4 16. g5+ Kxg5 17. Kxe5 h3 18. Kd6 h2 19. e5 h1=Q 20. Bxh1
Nxh1 21. e6 Ng3 22. e7 Nf5+) 15... h5 16. gxh5 gxh5 17. Kd6 g4 18. hxg4 hxg4
19. Kc5 Nd1 20. Kb4 Ne3 21. Bh1 g3) 2... f6 (2... g6 3. Qf6) 3. Bf3 Nxb7 4. Kg2
Qa8 5. Qc6 Qa7 6. Qc7 Qa6 7. Qc8 (7. h4 gxh4 8. g5+ fxg5 9. Qxe5 Na5 10. Qa1
Qb5 11. Qd4 Nc4 12. e5 Qa6 13. Kh3 Qc8+ 14. Bg4 Qc7 15. e6 Ne3 16. Qe4 Qc1 17.
Qf3 Qg1 18. e7 Nxg4 19. e8=Q Nf2+ 20. Qxf2 Qxf2 21. Qe6+ g6) 7... Qb6 8. Qb8
Qc6 9. Qa8 (9. Kf2 Na5 10. Qb1 Qc5+ 11. Kg2 Nc4 12. h3 Ne3+ 13. Kh2 Qc3 14. Qg1
(14. Kh1 Qd2 15. Kh2 Nd1 16. Qb6 Qd4 17. Qxd4 exd4 18. Kg2 g6 19. hxg6 Kxg6 20.
Kf1 Kf7 21. Ke1 Nc3 22. Kd2 Ke6 23. Kd3 Ke5 24. Bh1 Nd1 25. Bg2 Nf2+) 14... Qd2
15. Qf2 g6 16. hxg6 Kxg6 17. Qg1 Qd1 18. Qxd1 Nxd1 19. Kg2 Kf7 20. Kf1 Ke6 21.
Ke1 Ne3 22. Kd2 Kd6 23. Kc3 Kc5 24. Kd3 Kb4 25. Bh1 Kb3 26. Bf3 h6 27. Bh1 Kb2
28. Kd2 Nf1+ 29. Ke1 Ng3 30. Bf3 Kc3) 9... Qc7 10. Qa7 Qc8 (10... g6 11. hxg6
Kxg6 12. Qa2 Nd8 13. Qd5 Kg7 14. Qd3 Ne6 15. Qd5 Nd4 16. h3 Nc2 17. Kh2 Qa7 18.
Qd8 Ne3 19. Qe8 Qa2 20. Qe7+ Qf7 21. Qd8 Qf8 22. Qd7+ Kg6 23. Kh1) 11. Qa6 Qc7
(11... Qb8 12. Qb6) 12. Qa7 Qd7 13. Kh3 (13. Kf2 Qc6 14. Qa8 Qc5+) (13. Kh1 Qc6
14. Qa8 Qc1+) (13. h3 Qc7 14. Kh2 Qc6 15. Qa8 Qb6 16. Qb8 Qf2+ 17. Kh1 Qf1+ 18.
Kh2 Nc5 19. Qb4 Ne6 20. Qd2 Nd4 21. Qd3 Qf2+ 22. Kh1 Qe1+ 23. Kg2 Qg3+) 13...
Qe7 14. Kg2 Qf7 15. Qb6 (15. Kh3 Qb3 16. Qb8 Na5 17. Qxb3 Nxb3) (15. e3 Qb3 16.
exf4 gxf4 17. h4 Qc2+ 18. Kf1 Qc1+ 19. Ke2 (19. Kg2 Qe1) 19... Qc5 20. Qxc5
Nxc5 21. Kf2 Nb3 22. Be2 Nd4 23. Bd3 g6 24. hxg6 Kxg6 25. Kg2 h6 26. Kh3 Kf7
27. Kg2 (27. Bc4+ Ke7 28. Kg2 Kd6) 27... Ke6 28. Kf2 Kd6 29. Bc4 Kc5 30. Bf7
Nb5 31. Kf3 Kd4 32. Bd5 Nd6 33. Bc6 Kd3 34. Bd7 Kd2 35. Ba4 Ke1 36. Bd7 Nc4 37.
g5 fxg5 38. hxg5 hxg5 39. Kg4 Ne3+ 40. Kxg5 f3 41. Kf6 f2 42. Bb5 Nd1 43. Kxe5
Nc3 44. Ba6 Ne2) 15... Qe7 16. Qa7 Qd7 17. Kh3 Qc7 18. Kg2 Qc6 19. Qa8 Qb6 20.
Qb8 Qb5 21. Kh3 Qb4 22. Kg2 Qb3 23. Qc7 Qb4 (23... Qb1 24. Qb8 (24. Kh3 Qf1+
25. Bg2 Qf2) (24. h4 {<or>} gxh4 (24... Qb5 25. hxg5+ fxg5 26. Kh2) 25. g5+
fxg5 26. Qc6+ g6 27. hxg6 h3+ 28. Kh2) 24... Qb3 25. Qc7 Qb4 26. Qb8 Qb5 27.
Kh3 Qb6 28. Kg2 Qa6 29. Qc8 Qa7 30. Qc7 Qa8 31. Qc6 Qb8 32. Qb6 Qc8 33. Qa6 Qc7
34. Qa7 Qc6 35. Qa8 Qb6 36. Qb8) 24. Qb8 (24. h4 gxh4 25. g5+ fxg5 26. Qxe5 Qd6
27. Qe8 Nc5 28. e5 Qe6 29. Qxe6+ Nxe6 30. Bg4 Nc7 31. Kf2 g6 32. hxg6 Kxg6)
24... Qb5 25. Kh3 Qb6 26. Kg2 Qa6 27. Qc8 Qa7 28. Qc7 Qa8 29. Qc6 (29. h4 gxh4
30. g5+ fxg5 31. Qxe5 Qc8) 29... Qb8 30. Qb6 {Perpetual pin in eight
directions.} *

[/pgn]
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Ferdy
Posts: 4833
Joined: Sun Aug 10, 2008 3:15 pm
Location: Philippines

Re: Fortresses

Post by Ferdy »

Engine competitions on fortress positions.
http://www.talkchess.com/forum/viewtopi ... 24&t=54697
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Nordlandia
Posts: 2821
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Semi-Fortress !?

[d]8/1p4p1/7p/5P1k/3q1P2/3N4/1P2KN1P/8 b - - 0 7

Image
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Arpad Rusz
Posts: 273
Joined: Sat Apr 17, 2010 2:34 pm
Location: Budapest

Re: Fortresses

Post by Arpad Rusz »

I have presented on my blog some nice studies featuring fortresses:
http://ruszchessstudies.blogspot.hu/sea ... l/Fortress
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Graham Banks
Posts: 41416
Joined: Sun Feb 26, 2006 10:52 am
Location: Auckland, NZ

Re: Fortresses

Post by Graham Banks »

Fortresses are way more common than one would think.
gbanksnz at gmail.com
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Laskos
Posts: 10948
Joined: Wed Jul 26, 2006 10:21 pm
Full name: Kai Laskos

Re: Fortresses

Post by Laskos »

Ferdy wrote:Engine competitions on fortress positions.
http://www.talkchess.com/forum/viewtopi ... 24&t=54697
From your fortress positions as openings:

Code: Select all

6k1/8/6PP/3B1K2/8/2b5/8/8 b - - 0 1 
8/8/r5kP/6P1/1R3K2/8/8/8 w - - 0 1 
7k/R7/7P/6K1/8/8/2b5/8 w - - 0 1 
8/8/5k2/8/8/4qBB1/6K1/8 w - - 0 1 
8/8/8/3K4/8/4Q3/2p5/1k6 w - - 0 1 
8/8/4nn2/4k3/8/Q4K2/8/8 w - - 0 1 
8/k7/p7/Pr6/K1Q5/8/8/8 w - - 0 1 
k7/p4R2/P7/1K6/8/6b1/8/8 w - - 0 1
6k1/6Pp/7P/8/3BK3/8/8/8 w - - 0 1 
6k1/7p/5K1P/8/8/7P/6P1/8 w - - 0 1 
8/8/8/6k1/2q3p1/4R3/5PK1/8 w - - 0 1
Shredder 13 seems to win more and blunder less in games 1s/move on 2 threads (for play diversity). Round-Robin:

Code: Select all

 1.  Komodo 10.3 64-bit       	 99.0/200	20-22-158  	
 2.  asmFishW_2017-02-15_popcnt  101.5/200	24-21-155  	
 3.  Houdini 5.01 Pro x64-popc	102.5/200	26-21-153  	
 4.  Deep Shredder 13 x64     	110.0/200	32-12-156  	
 5.  Andscacs 0.89            	 87.0/200	14-40-146
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Ferdy
Posts: 4833
Joined: Sun Aug 10, 2008 3:15 pm
Location: Philippines

Re: Fortresses

Post by Ferdy »

Laskos wrote:
Ferdy wrote:Engine competitions on fortress positions.
http://www.talkchess.com/forum/viewtopi ... 24&t=54697
From your fortress positions as openings:

Code: Select all

6k1/8/6PP/3B1K2/8/2b5/8/8 b - - 0 1 
8/8/r5kP/6P1/1R3K2/8/8/8 w - - 0 1 
7k/R7/7P/6K1/8/8/2b5/8 w - - 0 1 
8/8/5k2/8/8/4qBB1/6K1/8 w - - 0 1 
8/8/8/3K4/8/4Q3/2p5/1k6 w - - 0 1 
8/8/4nn2/4k3/8/Q4K2/8/8 w - - 0 1 
8/k7/p7/Pr6/K1Q5/8/8/8 w - - 0 1 
k7/p4R2/P7/1K6/8/6b1/8/8 w - - 0 1
6k1/6Pp/7P/8/3BK3/8/8/8 w - - 0 1 
6k1/7p/5K1P/8/8/7P/6P1/8 w - - 0 1 
8/8/8/6k1/2q3p1/4R3/5PK1/8 w - - 0 1
Shredder 13 seems to win more and blunder less in games 1s/move on 2 threads (for play diversity). Round-Robin:

Code: Select all

 1.  Komodo 10.3 64-bit       	 99.0/200	20-22-158  	
 2.  asmFishW_2017-02-15_popcnt  101.5/200	24-21-155  	
 3.  Houdini 5.01 Pro x64-popc	102.5/200	26-21-153  	
 4.  Deep Shredder 13 x64     	110.0/200	32-12-156  	
 5.  Andscacs 0.89            	 87.0/200	14-40-146
Did you use bitbases or egtb?
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User avatar
Laskos
Posts: 10948
Joined: Wed Jul 26, 2006 10:21 pm
Full name: Kai Laskos

Re: Fortresses

Post by Laskos »

Ferdy wrote:
Laskos wrote:
Ferdy wrote:Engine competitions on fortress positions.
http://www.talkchess.com/forum/viewtopi ... 24&t=54697
From your fortress positions as openings:

Code: Select all

6k1/8/6PP/3B1K2/8/2b5/8/8 b - - 0 1 
8/8/r5kP/6P1/1R3K2/8/8/8 w - - 0 1 
7k/R7/7P/6K1/8/8/2b5/8 w - - 0 1 
8/8/5k2/8/8/4qBB1/6K1/8 w - - 0 1 
8/8/8/3K4/8/4Q3/2p5/1k6 w - - 0 1 
8/8/4nn2/4k3/8/Q4K2/8/8 w - - 0 1 
8/k7/p7/Pr6/K1Q5/8/8/8 w - - 0 1 
k7/p4R2/P7/1K6/8/6b1/8/8 w - - 0 1
6k1/6Pp/7P/8/3BK3/8/8/8 w - - 0 1 
6k1/7p/5K1P/8/8/7P/6P1/8 w - - 0 1 
8/8/8/6k1/2q3p1/4R3/5PK1/8 w - - 0 1
Shredder 13 seems to win more and blunder less in games 1s/move on 2 threads (for play diversity). Round-Robin:

Code: Select all

 1.  Komodo 10.3 64-bit       	 99.0/200	20-22-158  	
 2.  asmFishW_2017-02-15_popcnt  101.5/200	24-21-155  	
 3.  Houdini 5.01 Pro x64-popc	102.5/200	26-21-153  	
 4.  Deep Shredder 13 x64     	110.0/200	32-12-156  	
 5.  Andscacs 0.89            	 87.0/200	14-40-146
Did you use bitbases or egtb?
No.
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BBauer
Posts: 658
Joined: Wed Mar 08, 2006 8:58 pm

Re: Fortresses

Post by BBauer »

Semi-Fortress !?
What is a semi fortress?
But the position
fen:8/1p4p1/7p/5P1k/3q1P2/3N4/1P2KN1P/8 b - - 0 7

seams to be no fortress. White puts up zugzwang again and again.
Black loses material and the game.
Kind regards
Bernhard
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Nordlandia
Posts: 2821
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Yacov Murey vs Nigel Short, Brighton 1982.

This foretress is breakable.

[d]5Q2/4nbp1/4pk1p/3p4/3P1P2/2P5/8/2K5 w - - 2 54

https://lichess.org/MoY9bNEX#106
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