Fortresses

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

Moderator: Ras

User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Fortresses

Post by Nordlandia »

This thread will be dedicated to all known fortresses

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

2B5/2q1p3/6p1/6k1/4p3/4B1P1/4P1KP/8 b - - 0 5

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

4K3/2k1Bp1N/6p1/5PP1/8/7p/b7/8 w - - 0 0

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

4KBbn/5p2/6p1/3k1P2/3N2P1/7p/8/8 w - - 0 0

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

4knQ1/7r/3p2p1/2bP1pP1/5P1N/6K1/8/8 b - - 0 1

Image

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

7k/3K1p2/5NpB/6P1/8/8/8/7q b - - 0 4
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Semi-Fortress

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

6n1/8/5k2/4p1bR/4B1P1/6K1/8/8 b - - 0 5


Code: Select all

[Event "tv03#0525 {c} {m}"]
[Site "?"]
[Date "1995.??.??"]
[Round "?"]
[White "Aloni H"]
[Black "White wins"]
[Result "*"]
[SetUp "1"]
[FEN "Nrk5/1N6/n2n4/8/2B5/3KB3/1R5b/r2bQ3 b - - 0 1"]
[PlyCount "20"]
[EventDate "1995.??.??"]

1... Ra3+ $1 2. Kd4 $1 Be5+ $1 3. Kxe5 Rxe3+ $1 4. Kxd6 $1 Rxe1 5. Nb6+ $1 Kxb7
6. Nc8+ $1 Kxc8 7. Bxa6+ Rb7 {Nowotny} 8. Rxb7 $1 (8. Bxb7+ $2 Kb8 $1 (8... Kd8
$2 9. Bc6) 9. Bc6+ Ka7 10. Kc7 Re7+ 11. Bd7 Ba4) 8... Bf3 $1 9. Rb2+ (9. Rb1+
$2 Bb7 $1 10. Bxb7+ Kd8 $1 11. Rxe1) (9. Rb5+ $2 Bb7 10. Bxb7+ Kb8 11. Bc6+ Ka7
12. Kc7 Ka6) 9... Bb7 10. Bxb7+ Kd8 11. Bd5 $1 (11. Rg2 $2 Re2 $1 12. Rg8+ Re8
13. Rg7 Re7 $1 14. Rxe7) *

User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

5B1k/3p3b/3PpNq1/4Pp2/5P2/6PK/8/8 b - - 0 6
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

r7/kpPp4/N2P4/1P1p4/2p5/8/4b3/2K5
Vinvin
Posts: 5287
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Fortresses

Post by Vinvin »

Nordlandia wrote:[d]r7/kpPp4/N2P4/1P1p4/2p5/8/4b3/2K5
I suppose it's white to play :
8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

r7/kpPp4/N2P4/1P1p4/2p5/8/4b3/2K5 w - - 0 1
User avatar
hgm
Posts: 28353
Joined: Fri Mar 10, 2006 10:06 am
Location: Amsterdam
Full name: H G Muller

Re: Fortresses

Post by hgm »

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/8/8/3QK3/3n4/8/1b6/k7 w
Vinvin
Posts: 5287
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Fortresses

Post by Vinvin »

Some from my past test sets :

Vinvin
Posts: 5287
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Fortresses

Post by Vinvin »

more :
8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/8/8/5Bp1/7k/8/4pPKP/8 w - - 0 1
1.Bg4!


8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - 0 1
After 1.Rxh1 Nxh1 2.e6 dxe6 3.Bc7+ Kb7 4.Bxg3 e5
White bishop stays on e1-h4 diagonal so Knight cannot move and it is draw.



I'm not sure about this one :

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

3k4/2Rnn3/1p2pbp1/pP1p1pBp/P2P1P1P/4KPP1/4B3/8 w - - 0 2
2. Rxd7+ $4 {This move win a piece but black is in a fortress now : draw !} *


8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/1p2b3/6k1/5p2/p2NbP1p/P1B1P1p1/1P5P/6K1 w - - bm h3;
h3! "fortress From Smirin-HIARCS"


8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

5N2/6N1/q2k3p/8/6p1/4K1PP/B5P1/8 w - -
bm Nf5+!


8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/2B2k2/6p1/5P1p/6p1/p1p3PP/6P1/1n2K2R w K - 0 1

bm 1. fxg6+!



8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

q7/8/2p5/B2p2pp/5pp1/2N3k1/6P1/7K w - - 0 1
1. Ne4+ Kh4 2. Ng3 fxg3 3. Bb6 Qa1+ 4. Bg1 *
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Hint: Bishop Promotion :)



User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Fortresses

Post by Nordlandia »

Fixed solution of the last position.