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Author SHA1 Message Date
Gary Linscott afafdf7b73 MSVC compiling fixes 
No functional change.

Resolves #150
 2014-12-11 13:03:44 -05:00
Gary Linscott a87da2c4b3 Add some tablebase positions to bench 
This makes it easier to check for regressions in the tablebase code.

Bench: 9489202
5-man bench: 8943906

Resolves #145
 2014-12-08 07:58:05 +08:00
Gary Linscott 4509eb1342 Fix out-of-bound array access printing ponder move 
It is possible that we won't have a ponder move if our PV
is too short.  In that case, just don't print a ponder move.

No functional change

Resolves #130
 2014-11-24 08:53:00 +08:00
Gary Linscott 7ad59d9ac9 Fix pondering 
The UCI specification states that an engine can never exit the search
while pondering.

No functional change.

Resolves #118
 2014-11-24 08:50:36 +08:00
Gary Linscott bffe32f4fe Fix fen output for castling rights 
This is a regression from 428962a

We have to cast to char here, otherwise the compiler
interprets it as an integer, and writes a number.

No functional change

Resolves #122
 2014-11-19 06:37:59 +08:00
Gary Linscott 4739037f96 100% accurate PV display 
This gives SF accurate PVs, such that the evaluation of the leaf node in
the PV matches the score backed up to the root (99% of the time.
q-search will use the value stored in the hash table instead of the eval
value sometimes).

One drawback is that fail-high/low only get a minimal 2 move PV.

It doesn't add any additional overhead to the non-PV codepath except an
extra eight bytes to the SearchStack structure in multi-threaded
searches.

A core part of this is not pruning based on TT score in PV nodes. This
was measured as not being a regression at multiple TCs, except for one
exception, fast TC with huge hash, which is not realistic for longer
searches.

STC - 1 thread, 128 mb hash
ELO: 1.42 +-3.1 (95%) LOS: 81.9%
Total: 20000 W: 4078 L: 3996 D: 11926

STC - 3 thread, 128 mb hash
ELO: -3.60 +-2.9 (95%) LOS: 0.8%
Total: 20000 W: 3575 L: 3782 D: 12643

STC - 3 thread, 8 mb hash
ELO: 0.12 +-2.9 (95%) LOS: 53.3%
Total: 20000 W: 3654 L: 3647 D: 12699

LTC - 3 thread, 32mb hash
ELO: 2.29 +-2.0 (95%) LOS: 98.8%
Total: 35740 W: 5618 L: 5382 D: 24740

Bench: 6984058

Resolves #102
 2014-11-12 16:16:33 -05:00
Gary Linscott 766fb9c67d Fix spacing. 
No functional change.
 2014-09-22 01:27:34 +08:00
Gary Linscott b9a88da4ab Revert "Use compiler intrinsic instead of assembly for popcnt" 
This reverts commit a69f1d7c20.
 2014-07-01 17:01:54 -04:00
Gary Linscott 7ff865b924 Merge pull request #9 from glinscott/pawnspan 
Scale down endgames with pawns on one or two adjacent files

Passed STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 16081 W: 2745 L: 2604 D: 10732

Passed LTC
LLR: 2.95 (-2.94,2.94) [1.00,6.00]
Total: 123832 W: 17292 L: 16584 D: 89956

128k games to measure ELO at 15+0.05:
ELO: 2.07 +-1.1 (95%) LOS: 100.0%
Total: 128000 W: 21632 L: 20869 D: 85499

New bench: 8028792
 2014-06-26 12:21:06 -07:00
Gary Linscott ec627911f0 A bit more cleanup 2014-06-26 15:20:30 -04:00
Gary Linscott 22ffb588e5 Merge pull request #8 from glinscott/revert_ce1c260 
Revert "Check for an available slave early on"
 2014-06-26 08:20:45 -07:00
Gary Linscott e6a8d03dd8 Revert "Check for an available slave early on" 
This reverts commit ce1c260ea9.
 2014-06-26 11:16:36 -04:00
Gary Linscott 747e035c7d Original version of shane's patch 2014-06-25 16:45:14 -04:00
Gary Linscott ab580106fd Merge pull request #5 from glinscott/authors 
Add AUTHORS
 2014-06-23 09:14:03 -07:00
Gary Linscott 58bb23d0c3 Remove some duplicates 2014-06-21 00:49:49 -04:00
Gary Linscott bbacff5e01 Add AUTHORS 2014-06-20 21:35:09 -04:00
Gary LinscottandMarco Costalba 0510112f91 Move LowMobPenalty into psq/mobility tables 
Tested in no-regression mode.

Passed both STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 36705 W: 6537 L: 6443 D: 23725

and LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 9358 W: 1495 L: 1358 D: 6505

bench: 6921356
 2014-04-12 07:15:51 +02:00
Gary LinscottandMarco Costalba 4597324572 Reduce penalty for doubled pawns further away from each other 
Passed both STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 38339 W: 6849 L: 6649 D: 24841

and LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 22693 W: 3455 L: 3256 D: 15982

bench: 7508468
 2014-04-12 07:05:02 +02:00
Gary LinscottandMarco Costalba 8863afeb84 Add a penalty for low mobility pieces 
Passed both STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 81857 W: 14652 L: 14342 D: 52863

and LTC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 45400 W: 6999 L: 6697 D: 31704

bench: 7716978
 2014-04-10 08:35:10 +02:00
Gary LinscottandMarco Costalba 5c75455c8e Restrict queen mobility to safe squares 
Passed both STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 16188 W: 3119 L: 2971 D: 10098

and LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 6336 W: 1010 L: 882 D: 4444

bench: 7533692
 2014-04-08 22:25:54 +02:00
Gary LinscottandMarco Costalba 9b1d594456 Remove bishop pin bonus 
Shows no regression at LTC after 20K games:

ELO: 0.03 +-2.7 (95%) LOS: 51.0%
Total: 20608 W: 3252 L: 3250 D: 14106

bench: 7516178
 2013-12-31 15:27:52 +01:00
Gary LinscottandMarco Costalba 26689d8c2a Faster and simplified threat eval 
Add a bonus according if the attacking
pieces are minor or major.

Passed both short TC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 13142 W: 2625 L: 2483 D: 8034

And long TC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 18059 W: 3031 L: 2844 D: 12184

bench: 7425809
 2013-12-19 18:52:34 +01:00
Gary LinscottandMarco Costalba 13d1f0ae43 Restrict mobility of pinned pieces 
Passed both short TC:
LLR: 3.00 (-2.94,2.94) [-1.50,4.50]
Total: 54342 W: 10950 L: 10692 D: 32700

And long TC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 61976 W: 10654 L: 10251 D: 41071

This patch introduces a slowdown of 3.5 % !!!!!

bench: 7911558
 2013-11-07 22:26:03 +01:00
Gary LinscottandMarco Costalba 5d90c149b5 Enable LMR for dangerous moves 
Passed both short TC
LLR: 2.96 (-2.94,2.94)
Total: 5598 W: 1250 L: 1125 D: 3223

And long TC
LLR: 2.97 (-2.94,2.94)
Total: 16441 W: 3102 L: 2912 D: 10427

bench: 4620975
 2013-08-29 23:02:18 +02:00
Gary LinscottandMarco Costalba aecdbfc4a0 Add lsb() overload 
Helper to find least significant bit relative to
the given color.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2013-08-28 19:50:11 +02:00
Gary LinscottandMarco Costalba 049e5ca191 Minor bugfixes to refutation table 
Don't update refutation table in case of
previous move is MOVE_NULL or MOVE_NONE
and don't try refutation if is already
a killer move.

Pass both short TC
LLR: 2.96 (-2.94,2.94)
Total: 4310 W: 953 L: 869 D: 2488

And long one
LLR: 2.95 (-2.94,2.94)
Total: 6707 W: 1254 L: 1184 D: 4269

bench: 4785954
 2013-05-14 23:52:44 +02:00
Gary Linscott 11d30b6298 Fix rounding issue 2013-05-02 14:37:55 -04:00
Gary Linscott 3edb15d183 More aggressive move count pruning 2013-05-02 09:47:34 -04:00
Gary LinscottandMarco Costalba 52f3e717fa Add KNPKB endgame 
In a game vs Junior, SF had the option to trade into a winning
pawn endgame, and failed to do so. PGN at bottom.

This FEN was one key position: 8/2Nb1k2/6pp/4Pp2/5K1P/5PP1/8/8 w - - 5 62.

SF master chooses h5 here, with a fail high, which goes into the drawn KNPKB
ending. With the patch, SF correctly chooses Ke3, which maintains chances to win.

[Event "nTCEC - Stage 2a - Season 1"]
[Site "http://www.tcec-chess.net"]
[Date "2013.03.05"]
[Round "11.3"]
[White "Stockfish 210213"]
[Black "Junior 13.3"]
[Result "1/2-1/2"]
[Variant "normal"]

1. d4 f5 2. g3 Nf6 3. Bg2 e6 4. c4 d5 5. Nh3 c6 6. O-O Bd6 7. Bf4 Be7 8. Nd2 O-O
9. Qb3 a5 10. Rfd1 Ne4 11. Be3 Nd7 12. Nf4 Ndf6 13. f3 a4 14. Qc2 Nxd2 15. Bxd2
dxc4 16. Qxc4 b5 17. Qc3 Qb6 18. Rac1 e5 19. Nd3 exd4 20. Qxc6 Qxc6 21. Rxc6
Bd7 22. Rcc1 Be6 23. Bb4 Rae8 24. Bxe7 Rxe7 25. Nb4 Bc4 26. Bf1 Rd7 27. Rd2 Re8
28. Rcd1 Rc7 29. Ra1 Rd8 30. Rc1 Rdd7 31. Rcd1 Re7 32. Ra1 Nd5 33. Nc2 Ne3
34. Nxd4 Bxa2 35. Nxb5 Rc5 36. Nd4 Bf7 37. Kf2 g6 38. Rd3 Nxf1 39. Kxf1 Rc4
40. b3 axb3 41. Nxb3 Kf8 42. Rd8+ Re8 43. Rxe8+ Bxe8 44. Kf2 Ke7 45. Ra7+ Bd7
46. Ke1 Rc3 47. Rb7 Rc2 48. Kd1 Rc4 49. Kd2 Kd6 50. Kd3 Rc7 51. Rxc7 Kxc7
52. Kd4 Kd6 53. Nc5 Bb5 54. e4 Be2 55. e5+ Ke7 56. Ke3 Bd1 57. Kf4 h6 58. h3
Kf7 59. h4 Bc2 60. Na6 Ba4 61. Nc7 Bd7 62. h5 g5+ 63. Ke3 Ba4 64. f4 Bd1
65. fxg5 hxg5 66. h6 Kg6 67. e6 f4+ 68. gxf4 gxf4+ 69. Kxf4 Bh5 70. Ke5 Kh7
71. Kf6 Kxh6 72. Na6 Bg4 73. e7 Bh5 74. Nc7 Bg6 75. Nd5 Be8 76. Ne3 Kh7 77. Nc4
Kh6 78. Nd2 Kh5 79. Nf3 Kg4 80. Nd4 Bh5 81. Ne6 Be8 82. Nc5 Kf3 83. Kf5 Ke3
84. Ke5 Ke2 85. Kf4 Kd2 86. Ne4+ Kd3 87. Ke5 Ke3 88. Nf6 Bf7 89. Nd5+ Kf3
90. Kf5 Ke2 91. Ke4 Be8 92. Nc3+ Kd2 93. Kd4 Kc2 94. Nd5 Kd1 95. Nf6 Bf7
96. Ne4 Be8 97. Ke3 Kc2 98. Nd6 Bd7 99. Kd4 Kd1 100. Kd3 Ba4 101. Nc4 Bb5
102. Kc3 Be8 103. Nb2+ Ke1 104. Kd3 Kf2 105. Nd1+ 1/2-1/2

No functional change (just because bench does not change)
 2013-03-18 20:40:06 +01:00
Gary LinscottandMarco Costalba a24da071f0 Check for easy move just once 
Here the rational seems to be that if after one try easy
move detection fails then the easy move is not so easy :-)

After 15563 games at 60+0.05
ELO: 3.04 +-5.5 (95%) LOS: 97.0%
Total: 15563 W: 2664 L: 2528 D: 10371

No functional change.
 2013-03-11 22:23:19 +01:00
Gary LinscottandMarco Costalba 3698d9aa55 Be more aggressive on trying to finish iterations 
Increase MaxRatio to use more time when in trouble.

After 16000 games at 60+0.05
ELO: 4.89 +-5.4 (95%) LOS: 99.9%
Total: 16000 W: 2700 L: 2475 D: 10825

No functional change.
 2013-03-11 19:07:55 +01:00
Gary Linscott ea4e22be1d Merge branch 'master' into bishop_pin_clop 2013-02-19 10:31:52 -05:00
Gary Linscott dc8c6ea2d1 Bring back original bonus 2013-02-19 10:31:50 -05:00
Gary Linscott d570260a28 Back to CLOP average values 2013-02-16 22:36:58 -05:00
Gary Linscott 3922ac2fe4 Add new clop tuned value 2013-02-14 20:29:24 -05:00
Gary Linscott 66a1a77487 Merge branch 'master' into bishop_pin_clop 2013-02-13 21:41:15 -05:00
Gary Linscott cd0ecace19 Revert "Use CLOP mean value instead of max" 
This reverts commit d0c2faa5fd.
 2013-02-13 21:40:38 -05:00
Gary Linscott d0c2faa5fd Use CLOP mean value instead of max 2013-02-13 12:21:16 -05:00
Gary Linscott 671f24ff35 Merge branch 'simplify_eval' into bishop_pin_clop 2013-02-13 12:19:54 -05:00
Gary Linscott f32f899467 CLOP tuned 2013-02-13 00:12:02 -05:00
Gary Linscott 17b71fe51d Add clop parameters 2013-02-12 00:10:21 -05:00
Gary Linscott 30c2e3828a Merge branch 'master' into simplify_eval 2013-02-11 10:26:25 -05:00
Gary Linscott a7cdf7299a Bishop pins only 2013-02-11 10:26:18 -05:00
Gary Linscott 0c06b4509d Slight tweak to king safety. Bench: 5534531 2013-02-08 08:53:13 -05:00
Gary LinscottandMarco Costalba c67fb8ef04 Add KBPKP endgame 
It is a draw if pawns are on G or B files, weaker pawn is
on rank 7 and bishop can't attack the pawn.

No functional change (because it is very rare and does not appear in bench)
 2013-02-07 06:51:55 +01:00
Gary Linscott a72710c660 Simplify eval take 2. Bench 5097444 2013-02-02 10:19:59 -05:00
Gary Linscott 57797822f8 Bring back just bishop pins 2013-01-26 15:35:00 -05:00
Gary Linscott e83b9075ff Simplify evaluation 2013-01-24 08:54:13 -05:00
Gary LinscottandMarco Costalba cee6336515 Detect drawish KQKP endings 
Based off of the rules from the wikipedia page,
here: http://en.wikipedia.org/wiki/Queen_versus_pawn_endgame.

bench does not change: 5312693 but patch is real, has been
tested on specific positions.
 2012-10-28 10:17:57 +01:00
Gary LinscottandMarco Costalba fdbe8006e0 Bonus for rook/queen attacking pawns on same rank 
Patch and tuning by Gary Linscott from an idea of Ryan Taker.

Double tested by Gary:

Wins: 3390 Losses: 2972 Draws: 11323
LOS: 99.999992%
ELO: 8.213465 +- 99%: 6.746506 95%: 5.124415
Win%: 51.181792 +- 99%: 0.969791 95%: 0.736740

And by me:

After 5612 games 1255  1085  3271 +11 ELO
 2012-09-21 23:25:13 +02:00
Gary Linscott 374c9e6b63 Add more detailed pawn shelter/storm evaluation 2012-03-26 07:52:10 -04:00
Gary Linscott dbe5e28eaa Merge remote-tracking branch 'upstream/master' 2012-03-25 10:18:29 -04:00
Gary Linscott f41a21fefd Penalty for undefended rook as well 2012-03-22 07:33:47 -04:00
Gary Linscott d1e18fc7dd Optimize undefended minor check. 2012-03-21 08:19:21 -04:00
Gary LinscottandMarco Costalba 3c6a4bfbed Penalize undefended minors 
Even if not under attack. This seems to be good
especially on openings.

After 12112 games at 10"+0.05
Mod vs Orig 2175 - 1997 - 7940 ELO +5 (+- 3.7)

[Patch series from Gary, little edited by me]

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2012-03-21 08:00:57 +01:00
Gary Linscott b46bf2950f Simpler stalemate check. 2012-02-05 14:52:01 -05:00
Gary Linscott 0347339970 Detect stalemate in KXK endgames 
Also, handle cases where there are 2 bishops of the same color.
 2012-02-05 10:24:53 -05:00