An idea for a different type of tournament

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jp
Posts: 1470
Joined: Mon Apr 23, 2018 7:54 am

Re: An idea for a different type of tournament

Post by jp »

Jouni wrote: ↑Mon Feb 10, 2020 4:52 pm Don't expect SF 11 to find shortest mate in 2 posted positions. It can't even find mate in 11 :oops:

[d]3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1
What engine gives you mate in 11??

Komodo 13.2 only finds mate in 12 up to depth 27:

depth=23
+M12 1.e4 Kd7 2.Qh5 Kc7 3.Nc3 Kb7 4.d4 Qc7 5.Qf5 Qb6 6.Bf4 Qd8 7.Qb5+ Qb6 8.Qd7+ Ka8 9.Qc8+ Ka7 10.Nb5+ Qxb5 11.Bxb5 Kb6 12.Qa6#
...
depth=27
+M12 1.e4 Qg5 2.Qf3 Qg7 3.Bc4 Kd8 4.d3 Ke8 5.Qh5+ Kd8 6.Qa5+ Ke8 7.Bg5 Qxg5 8.Qxg5 Kd7 9.Qc5 Kd8 10.Qd6+ Ke8 11.Qc7 Kf8 12.Qf7#


SF10 does worse:
depth=58
+M13 1.e3 Kd7 2.Qg4+ Kc6 3.Qe6+ Kb7 4.Nc3 Qb6 5.Qxb6+ Kxb6 6.h4 Kc7 7.h5 Kd8 8.h6 Kd7 9.h7 Ke7 10.h8=Q Kf7 11.Rh6 Ke7 12.Qg7+ Kd8 13.Rh8#
depth=59
+M13 1.e3 Ke7 2.Nc3 Qg8 3.Qf3 Qf7 4.Qxf7+ Kxf7 5.h4 Kg7 6.h5 Kh6 7.Nf3 Kg7 8.h6+ Kf6 9.h7 Ke7 10.h8=Q Kd7 11.Qg7+ Kd6 12.Rh6+ Kc5 13.Qd4#

If you put 1.e4 on the board, SF10 finds mate in 12 at or before depth 44, but cannot improve by depth 59:

depth=44
+M11 1...Qd7 2.Qh5+ Kf8 3.Qc5+ Kf7 4.Bc4+ Ke8 5.Bb5 Qxb5 6.Qxb5+ Ke7 7.Qc6 Kf7 8.Qd7+ Kg6 9.d4 Kf6 10.Bf4 Kg6 11.Qe7 Kh5 12.Qg5#
...
depth=57
+M11 1...Qd7 2.Qh5+ Qf7 3.Qxf7+ Kxf7 4.h4 Kg7 5.h5 Kh6 6.d3+ Kg7 7.h6+ Kg6 8.h7 Kf7 9.h8=Q Ke7 10.Qg7+ Kd6 11.d4 Kc6 12.Rh6#
depth=58
+M11 1...Qd4 2.Qf3 Qg7 3.d4 Qg6 4.Nc3 Qf7 5.Bb5+ Ke7 6.Bg5+ Kf8 7.Bh6+ Kg8 8.Bc4 Kh7 9.Qxf7+ Kxh6 10.Qf6+ Kh7 11.Qg5 Kh8 12.Qh6#
depth=59
+M11 1...Qd4 2.Qf3 Qg7 3.d4 Qg6 4.Nc3 Qf7 5.Bb5+ Ke7 6.Bg5+ Kf8 7.Bh6+ Kg8 8.Bc4 Kh7 9.Qxf7+ Kxh6 10.Qf6+ Kh7 11.Qg5 Kh8 12.Qh6#
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duncan
Posts: 12038
Joined: Mon Jul 07, 2008 10:50 pm

Re: An idea for a different type of tournament

Post by duncan »

jp wrote: ↑Fri Mar 06, 2020 7:03 pm
Uri Blass wrote: ↑Sat Feb 15, 2020 11:32 pm SF can show ... (mate in 15).

FEN: 4k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1

Stockfish_20021515_x64_modern:
<snip>
46/32 11:05 3,054,954k 4,588k +M15 1.e3 g6 2.Qg4 a6 3.Qd4 d6 4.Qa7 c6 5.Qxb7 Kf8 6.Qxc6 Kg7 7.Qd7 Kf6 8.Nc3 d5 9.Nf3 a5 10.Nxd5+ Kg7 11.Qxe7 g5 12.Nxg5 Kg6 13.Qxf7+ Kxg5 14.Qf6+ Kg4 15.Be2+
47/30 11:43 3,227,612k 4,591k +M15 1.e3 g6 2.Qg4 a6 3.Qd4 d6 4.Qa7 c6 5.Qxb7 Kf8 6.Qxc6 Kg7 7.Qd7 e6 8.Qxd6 a5 9.Nf3 g5 10.Qe7 g4 11.Ne5 a4 12.Qxf7+ Kh6 13.Nxg4+ Kg5 14.h4+ Kxg4 15.Be2+
48/30 13:24 3,660,153k 4,550k +M15 1.e3 g6 2.Qg4 a6 3.Qd4 d6 4.Qa7 c6 5.Qxb7 Kf8 6.Qxc6 Kg7 7.Qd7 e6 8.Qxd6 a5 9.Nf3 g5 10.Qe7 g4 11.Ne5 a4 12.Qxf7+ Kh6 13.Nxg4+ Kg5 14.h4+ Kxg4 15.Be2+
49/30 14:37 3,975,783k 4,531k +M15 1.e3 g6 2.Qg4 a6 3.Qd4 d6 4.Qa7 c6 5.Qxb7 Kf8 6.Qxc6 Kg7 7.Qd7 e6 8.Qxd6 g5 9.Qe7 g4 10.Nf3 e5 11.Nxe5 a5 12.Qxf7+ Kh6 13.Qf6+ Kh5 14.Be2 a4 15.Bxg4+
Previously I also removed White's Rs and QB (because they weren't being used in SF's lines; I doubt it makes any difference):

[d]4k3/pppppppp/8/8/8/8/PPPPPPPP/1N1QKBN1 w - - 0 1

After 1.e3 h6 2. Qf3,
SF10 shows mate by move 15 (with ...c6 best):

2...c6 3. Qg3 e5 4. Qxe5+ Kd8 5. Qb8+ Ke7 6. Qxb7 h5 7. Qxa7 g5 8. Nf3 f6 9. Nd4 g4 10. Nf5+ Ke6 11. e4 h4 12. Nc3 Kf7 13. Qxd7+ Kg6 14. Qg7+ Kh5 15. Qh6#
2... e6 3. Qxb7 g5 4. Qxc7 a6 5. Qd6 g4 6. Bxa6 f5 7. Bb5 Kf7 8. Qxd7+ Kf6 9. Bc4 h5 10. Qxe6+ Kg7 11. Qg8+ Kf6 12. Qf7+ Kg5 13. Qg7+ Kh4 14. g3#
2... g5 3. Qxb7 e6 4. Nf3 f6 5. Qxc7 a6 6. Bxa6 g4 7. Bb5 gxf3 8. Qxd7+ Kf8 9. Qxe6 h5 10. Bc4 Kg7 11. Qg8+ Kh6 12. Bf7 fxg2 13. Qg6#
2... d5 3. Qxd5 c6 4. Qe5 Kd7 5. Qb8 b5 6. Nf3 f6 7. Bd3 g5 8. Nd4 e6 9. Qb7+ Kd6 10. Qxc6+ Ke7 11. Qc7+ Ke8 12. Nxe6 a5 13. Bxb5#
2... e5 3. Qxb7 Kd8 4. Qb8+ Ke7 5. Qxc7 a6 6. Bxa6 g5 7. Qxe5+ Kf8 8. Nc3 g4 9. Nd5 Kg8 10. Ne7+ Kf8 11. Nf5 f6 12. Qxf6+ Kg8 13. Qg7#
2... Kf8 3. Qxb7 g5 4. Qxc7 g4 5. Qd8+ Kg7 6. Qxe7 d5 7. Ne2 d4 8. Nf4 g3 9. hxg3 dxe3 10. Ne6+ Kg6 11. Bd3+ f5 12. Nf4#

The 1.e3 g6 2.Qg4 lines may be more difficult for SF to complete.


Yours is an 18 point handicap.

This is another 18 point handicap although it should be able to find faster than mate in 23.

stockfish 7, Mate in 23 depth 42/66

[pgn]
[FEN "r1b1kbnr/8/8/8/8/8/PPP2PPP/RNBQKBNR w KQkq"]

Bf1-b5+ Ke8-f7 Qd1-d5+ Bc8-e6 Qd5xa8 Ng8-e7 Bc1-g5 Rh8-h7 Qa8-e4 Be6-f5 Qe4-e5 Rh7-h6 Bg5xh6 Bf8xh6 Bb5-c4+ Kf7-e8 Qe5-h8+ Bh6-f8 Qh8-f6 Bf8-h6 Bc4-b5+ Bf5-d7 Bb5xd7+ Ke8xd7 Qf6xh6 Ne7-c6 Qh6xc6+ Kd7xc6 h2-h4 Kc6-d5 h4-h5 Kd5-c4 h5-h6 Kc4-c5 h6-h7 Kc5-d6 Rh1-h6+ Kd6-c5 h7-h8Q Kc5-d5 Nb1-d2 Kd5-c5 Qh8-e5+ Kc5-b4 Rh6-h4+
[/pgn]

and a 14 point handicap

Stockfish 7, Mate in 20 depth 36/58

[pgn]
[FEN "r1b1kbnr/8/8/8/8/8/P6P/RNBQKBNR w KQkq - 0 1"]

Bf1-b5+ Ke8-e7 Bc1-g5+ Ng8-f6 Qd1-f3 Bf8-g7 Qf3xa8 Bc8-d7 Qa8-b7 Rh8-d8 Qb7-c7 Ke7-e6 Bb5-c4+ Ke6-f5 Qc7xd8 Bd7-c6 Bc4-d3+ Bc6-e4 Bd3xe4+ Nf6xe4 Qd8-d5+ Kf5-g6 Qd5xe4+ Kg6-f7 Qe4-f5+ Kf7-g8 Qf5-e6+ Kg8-h8 Bg5-f6 Bg7xf6 Qe6xf6+ Kh8-g8 Qf6-e7 Kg8-h8 Ng1-f3 Kh8-g8 Rh1-g1+ Kg8-h8 Qe7-h4+
[/pgn]
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Dann Corbit
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Re: An idea for a different type of tournament

Post by Dann Corbit »

3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 23; bm e4; ce 32746; dm 11; c3 "e4"; pm e4; pv e4 Ke7 d4 Qg8 Qh5 Qe6 Bb5 Qxe4+ Ne2 Qe6 Qe8+ Kf6 Bg5+ Kf5 Bd3+ Kxg5 Qxe6 Kh4 Qh6+ Kg4 f3#;
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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towforce
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Location: Birmingham UK

Re: An idea for a different type of tournament

Post by towforce »

Uri Blass wrote: ↑Sun Feb 09, 2020 4:14 am Let chess engines start from the following position and play 2 games with white and black. The winner is the side that mate faster.

One thing you need to be aware of: in the 1990s, chess computer programs used to book-up against each other - and occasionally those books could not be turned off. This would be a risk for this type of tournament. The obvious counter-measure would be a large number of start positions to choose from.
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Dann Corbit
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Re: An idea for a different type of tournament

Post by Dann Corbit »

Bigger collection:

Code: Select all

1n1qk1n1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1n2k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1nb1k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1nbqkbn1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
2b1kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
2bqkb2/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 
4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
4k3/pppppppp/8/8/8/8/PPPPPPPP/1N1QKBN1 w - -
4k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
r2qk2r/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
r3k2r/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
r3k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq -
rnb1kbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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Dann Corbit
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Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: An idea for a different type of tournament

Post by Dann Corbit »

One of my test positions was a duplicate (had an extra space at the end so uniq did not remove it).
There are six of the positions unsolved as to checkmate:

Code: Select all

rnb1kbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 43; bm g3; ce 1194; pm g3; pv g3 d5 Bg2 c6 d3 Nh6 e3 f6 Ne2 Nf5 Nd2 e5 O-O Be7 a4 Be6 c3 Nd6 a5 Bf7 b4 O-O Rb1 Nd7 Qb3 Rfd8 Ra1 e4 d4 f5 Qc2 Nf6 Qd1 Rd7 a6 b6 Bb2 g6 Nf4 Rad8 f3 exf3 Nxf3; 
1nbqkbn1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 46; bm d4; ce 1237; pm d4; pv d4 d6 Nf3 e6 c4 Nd7 e4 c5 d5 e5 Nc3 Qb6 Bd3 g6 O-O a6 Qb3 Qc7 Qa4 Be7 Bg5 Kf8 Qc2 Ngf6 h3 Bd8 b3 Qb6 Rfe1 Qa5 Be3 Qc7 Rad1 Qb8 Bd2 Bc7 Bh6+ Kg8 Be3 Ba5 Bd2 Qc7 Ne2 Bb6 Ng5 Qd8 f4 exf4; 
r2qk2r/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 43; bm c4; ce 1902; pm c4; pv c4; 
2bqkb2/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 46; bm e4; ce 2198; pm e4; pv e4; 
1n1qk1n1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 47; bm Nf3; ce 2248; pm Nf3; pv Nf3 g6 d4 Kf8 Nc3 d6 e4 e6 Bg5 Qc8 Qd2 Nd7 O-O-O Kg7 Kb1 a6 Bd3 h6 Bf4 Qd8 Rhe1 Nf8 Ne2 g5 Be3 Ng6 Qb4 b5 Qa5 Qc8 a4 Nf6 axb5 axb5 Qxb5 Ng4 Qb4 f6 Nc3 Qd7 Qb5 c6 Qc4 Nxe3 Rxe3 Ne7 g3; 
r3k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - acd 41; bm e3; ce 3518; pm e3; pv e3 c6 Qg4 g6 Qh4 h5 Qd4 f6 Qd3 O-O-O Qxg6 Rh8 Qg7 Re8 Qf7 Kd8 Qxe8+ Kxe8 Be2 h4 h3 Kf8 Nf3 Kg7 Nxh4 Kf7 a4 Ke8 a5 Kd8 Nc3 Kc7 Nf5 e6 Nh4 Kd8 Ne4 f5 Nc3 Kc8 Bd3 Kd8 Nf3 Ke7 a6 b5 b4 Kf6 g4 Kf7 g5 Kg6 h4 Kf7 Ke2 Kf8 Ba3; 
4k3/pppppppp/8/8/8/8/PPPPPPPP/1N1QKBN1 w - - acd 33; bm e3; ce 32736; dm 16; pm e3; pv e3 g6 Qf3 c6 Qg3 d6 Qh3 f5 Qxh7 f4 Qxg6+ Kd7 Nh3 fxe3 fxe3 Kc7 Ng5 Kd7 Qe6+ Kd8 Nf7+ Kc7 Qxe7+ Kb6 Nxd6 Ka5 Qxb7 a6 Qxa6+ Kb4 Qa3+; 
4k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 31; bm e3; ce 32738; dm 15; pm e3; pv e3 c6 Qg4 g6 Qd4 Kd8 Qh8+ Kc7 Qe5+ Kc8 Qxe7 a6 Nf3 f6 Qxf6 Kc7 Qe7 c5 Ne5 c4 Bxc4 b5 Qc5+ Kd8 Nf7+ Ke8 Qc8+ Ke7 Qd8+; 
r3k2r/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 31; bm e3; ce 32738; dm 15; pm e3; pv e3 Ra5 Qg4 Rhh5 Qc8+ Ke7 Qc7+ Ke8 Bc4 Rac5 Qf7+ Kd8 Be6 Rh7 Qf8+ Kc7 Qxc5+ Kb8 Qc8+ Ka7 Bd5 Kb6 Qc6+ Ka7 Na3 Kb8 Nb5 Ra7 Qe8+; 
1n2k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 40; bm d4; ce 32746; dm 11; pm d4; pv d4 Nf6 e4 Kd8 Bg5 Nd7 Qg4 Ke7 Bxf6+ Nxf6 Qg7+ Kd6 Qxf6+ Kd7 Bb5+ Kc8 Qc6+ Kb8 Ba6 Ka7 Qb7+; 
2b1kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 41; bm e4; ce 32746; dm 11; pm e4; pv e4 Kd8 Qh5 Bd6 Bb5 Kc7 Qe8 Bf4 Nc3 Bb7 Qf7+ Kb8 Qxf4+ Ka8 Na4 Bxe4 Nb6+ Ka7 Nd7 Bxg2 Qb8+; 
3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 35; bm e4; ce 32746; dm 11; c3 "e4"; pm e4; pv e4 Qh4 Nc3 Kf8 d4 Kg8 Bc4+ Kg7 Qf3 Qf6 Qg4+ Qg6 Qd7+ Kh8 Qe7 Qg8 Bxg8 Kxg8 Bh6 Kh8 Qg7+; 
1nb1k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 40; bm e4; ce 32748; dm 10; pm e4; pv e4 Ba6 Nc3 Bb7 Qg4 Kd8 Qe6 Nd7 d4 Nf6 Qxf6+ Kd7 Bg5 Bxe4 Qe7+ Kc8 Bf4 Bc6 Qc7+; 
1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 37; bm e4; ce 32752; dm 8; pm e4; pv e4 Nc6 Qh5+ Kd7 Qd5+ Ke7 Qxc6 Kd8 d4 Ke7 Qc7+ Kf6 Bc4 Kg6 Qf7+; 
4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - acd 35; bm e4; ce 32752; dm 8; pm e4; pv e4 Nf6 d4 Ke7 Qf3 Nh7 Bb5 Nf6 Bg5 Kd8 Qxf6+ Kc8 Bf4 Kb7 Qa6+;
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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jp
Posts: 1470
Joined: Mon Apr 23, 2018 7:54 am

Re: An idea for a different type of tournament

Post by jp »

Rook and pawns only...

r3k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - 0 1
mmt wrote: ↑Fri Feb 14, 2020 10:43 am 59/50 1:49:41 398,262,715k 60,513k +M25 e2-e3 g7-g6 Qd1-g4 c7-c6 Qg4-h4 h7-h5 Qh4-d4 f7-f6 Qd4-d3 Ke8-d8 Qd3xg6 Kd8-c7 Qg6xh5 Ra8-f8 Qh5-h7 Kc7-d8 Qh7-g7 Rf8-e8 Ng1-f3 Kd8-c7 Qg7-f7 Kc7-d8 Bf1-d3 Re8-h8 Bd3-g6 a7-a6 Qf7-g7 Rh8-h5 Bg6xh5 a6-a5 Qg7-f8+ Kd8-c7 Qf8xe7 a5-a4 Bh5-g6 a4-a3 Nb1xa3 f6-f5 Nf3-e5 f5-f4 e3xf4 Kc7-b6 Qe7-d8+ Kb6-a7 Ne5xd7 b7-b6 Qd8xb6+ Ka7-a8 Qb6-a6+

It traps the rook. I bet there is a faster mate.
(mmt said in a later post this was for SF11.)

Adding another rook...
mmt wrote: ↑Sat Aug 29, 2020 11:57 pm I once ran SF Matefinder on this position for over a day:

[d]r3k2r/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
It reached a depth of 51 but couldn't find a mate. Existing programs are not optimized to be most efficient when there is a huge advantage but this shows that we are far from solving chess.
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jp
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Re: An idea for a different type of tournament

Post by jp »

duncan wrote: ↑Fri Aug 28, 2020 12:11 pm Yours is an 18 point handicap.

This is another 18 point handicap although it should be able to find faster than mate in 23.

stockfish 7, Mate in 23 depth 42/66
[FEN "r1b1kbnr/8/8/8/8/8/PPP2PPP/RNBQKBNR w KQkq"]

and a 14 point handicap

Stockfish 7, Mate in 20 depth 36/58
[FEN "r1b1kbnr/8/8/8/8/8/P6P/RNBQKBNR w KQkq - 0 1"]
I'd like to know how easy it is for engines to find mate in this position:

[d]4k3/pppppppp/8/8/8/8/PPPPPPPP/RNB1KBNR w KQkq
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duncan
Posts: 12038
Joined: Mon Jul 07, 2008 10:50 pm

Re: An idea for a different type of tournament

Post by duncan »

jp wrote: ↑Thu Sep 03, 2020 5:54 am
duncan wrote: ↑Fri Aug 28, 2020 12:11 pm Yours is an 18 point handicap.

This is another 18 point handicap although it should be able to find faster than mate in 23.

stockfish 7, Mate in 23 depth 42/66
[FEN "r1b1kbnr/8/8/8/8/8/PPP2PPP/RNBQKBNR w KQkq"]

and a 14 point handicap

Stockfish 7, Mate in 20 depth 36/58
[FEN "r1b1kbnr/8/8/8/8/8/P6P/RNBQKBNR w KQkq - 0 1"]
I'd like to know how easy it is for engines to find mate in this position:

[d]4k3/pppppppp/8/8/8/8/PPPPPPPP/RNB1KBNR w KQkq
I assume if you knock of a couple of white pawns, the computer will find it in a reasonable amount of time.

[d]4k3/1pppppp1/p6p/8/8/8/1PP2PP1/RNB1KBNR w KQ - 0 1
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Dann Corbit
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Location: Redmond, WA USA

Re: An idea for a different type of tournament

Post by Dann Corbit »

Current file "oddsmatch.epd" (note that the originals had some castling bugs):

Code: Select all

1n1qk1n1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1n2k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1nb1k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
1nbqkbn1/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
2b1kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
2bqkb2/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
4k3/1pppppp1/p6p/8/8/8/1PP2PP1/RNB1KBNR w KQ -
4k3/pppppppp/8/8/8/8/PPPPPPPP/1N1QKBN1 w - -
4k3/pppppppp/8/8/8/8/PPPPPPPP/RNB1KBNR w KQkq
4k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
r1b1kbnr/8/8/8/8/8/P6P/RNBQKBNR w KQKQ -
r1b1kbnr/8/8/8/8/8/PPP2PPP/RNBQKBNR w KQkq -
r2qk2r/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
r3k2r/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQKQ -
r3k2r/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
r3k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq -
r3k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - 
rnb1kbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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