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Author SHA1 Message Date
Stefan GeschwentnerandMarco Costalba 4bc11984fc Introduce capture history table for capture move sorting 
Introduce capture move history table indexed by moved piece,
target square and captured piece type for sorting capture moves.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 11374 W: 2096 L: 1924 D: 7354
http://tests.stockfishchess.org/tests/view/59fac8dc0ebc590ccbb89fc5

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 24791 W: 3196 L: 3001 D: 18594
http://tests.stockfishchess.org/tests/view/59fae4d20ebc590ccbb89fd9

Bench: 5536775
 2017-11-03 13:57:18 +01:00
Stefan GeschwentnerandJoona Kiiski 69ec09bd4b Bonus for pawn scrifice which create passed pawn 
STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 16752 W: 3141 L: 2944 D: 10667

LTC:
LLR: 3.34 (-2.94,2.94) [0.00,5.00]
Total: 33928 W: 4544 L: 4300 D: 25084

Bench: 5639223

Closes #1092
 2017-05-07 20:51:52 -07:00
Stefan GeschwentnerandMarco Costalba 471f7a1b5c Candidate passed pawns 
Detect safe candidate passers.

STC: http://tests.stockfishchess.org/tests/view/5882395c0ebc5915193f78b3
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 53569 W: 9925 L: 9570 D: 34074

LTC: http://tests.stockfishchess.org/tests/view/5882b4fb0ebc5915193f78e2
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 77576 W: 10387 L: 10014 D: 57175

Bench: 5325829
 2017-01-28 09:04:24 +01:00
Stefan GeschwentnerandMarco Costalba 344616e917 Bonus for attacked passed pawn promotion path 
Bonus for each attacked square on the promotion path
of an enemy passed pawn.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 141511 W: 25295 L: 24579 D: 91637

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 23161 W: 3022 L: 2831 D: 17308

Bench: 5926706
 2016-10-30 13:48:03 +01:00
Stefan GeschwentnerandMarco Costalba 6aa9308f08 Tweak probcut threshold 
Use better threshold for capture move generation.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 23265 W: 4415 L: 4188 D: 14662

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 36618 W: 5083 L: 4836 D: 26699

bench: 7030088
 2016-08-29 22:15:03 +02:00
Stefan GeschwentnerandJoona Kiiski a273b6ef8c Add followup moves history for move ordering 
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 7955 W: 1538 L: 1378 D: 5039

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 5323 W: 778 L: 642 D: 3903

Bench: 8261839

Resolves #599
 2016-03-10 14:26:06 -08:00
Stefan GeschwentnerandJoona Kiiski cccf3c815c Bonus for reachable outpost 
Give a bonus for outpost squares which in reach of a bishop or knight.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 22725 W: 4570 L: 4339 D: 13816

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 15019 W: 2333 L: 2157 D: 10529

Bench: 8503181

Resolves #495
 2015-11-14 06:31:45 -08:00
Stefan GeschwentnerandJoona Kiiski 83e19fbed5 File based passed pawn bonus 
Add file based bonus for passed pawns. Values tuned by SPSA.

STC:
LLR: 3.33 (-2.94,2.94) [0.00,5.00]
Total: 36889 W: 6805 L: 6507 D: 23577

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 32301 W: 5101 L: 4858 D: 22342

Bench: 8073614

Resolves #436
 2015-10-03 03:50:06 -07:00
Stefan GeschwentnerandJoona Kiiski 660c38f781 Scales the endgame score by the number of pawns. 
Credits goes also to Stephane Nicolet for his great idea of scaling by pawns.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 9994 W: 1929 L: 1760 D: 6305

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 11240 W: 1789 L: 1626 D: 7825

bench 7298564

Resolves #423
 2015-09-15 05:55:09 -07:00
Stefan GeschwentnerandGary Linscott e14046517e Remove Gain Stats 
Additionally in futility pruning the margin is raised for compensation.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 48481 W: 9229 L: 9156 D: 30096

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 32058 W: 5134 L: 5031 D: 21893

Bench: 8098149

Resolves #350
 2015-05-18 13:59:30 -07:00
Stefan GeschwentnerandJoona Kiiski 27efc5ac99 Update stats at pv nodes 
If a quiet best move is found at a pv node then always update stats.

STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 41485 W: 8047 L: 7830 D: 25608

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 14351 W: 2420 L: 2250 D: 9681

Bench: 6985247

Resolves #330
 2015-04-10 20:34:55 +01:00
Stefan GeschwentnerandJoona Kiiski ef4d89c9bd update stats also in check 
Update stats also if in check (drop condition).

STC:
LLR: 3.22 (-2.94,2.94) [-3.00,1.00]
Total: 87472 W: 16929 L: 16913 D: 53630

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 39971 W: 6436 L: 6345 D: 27190

Bench: 7086031

Resolves #327
 2015-04-09 20:41:08 +01:00
Stefan GeschwentnerandJoona Kiiski 13c11f4048 Introduce Counter Move History tables 
Introduce a counter move history table which additionally is indexed by the last move's piece and target square.
For quiet move ordering use now the sum of standard and counter move history table.

STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 4747 W: 1005 L: 885 D: 2857

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 5726 W: 1001 L: 872 D: 3853

Because of reported low NPS on multi core test
STC (7 threads):
ELO: 7.26 +-3.3 (95%) LOS: 100.0%
Total: 14937 W: 2710 L: 2398 D: 9829

Bench: 7725341

Resolves #282
 2015-03-12 07:29:57 +00:00
Stefan GeschwentnerandGary Linscott 18b0809639 Add bonus for pawn attack threats 
Latent pawn attacks: Add a bonus to safe pawn pushes which attacks an
enemy piece.  Based on an idea of Lyudmil Tsvetkov.

STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 7925 W: 1666 L: 1537 D: 4722

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 40109 W: 6841 L: 6546 D: 26722

Bench: 7696257

Resolves #240
 2015-02-03 11:19:33 +08:00
Stefan GeschwentnerandJoona Kiiski d8b3ad2208 Fix a skill level problem: Don't allow move pruning at root node 
Bench: 8918745

Resolves #231
 2015-01-25 21:57:13 +00:00
Stefan GeschwentnerandJoona Kiiski 4abe333e1f Enable Futility pruning in PV nodes 
STC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 21553 W: 4342 L: 4221 D: 12990

LTC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7675 W: 1351 L: 1209 D: 5115

Bench: 8668014

Resolves #205
 2015-01-14 20:13:48 +00:00
Stefan GeschwentnerandGary Linscott 25b492ab58 Big King Safety tuning 
All king safety related terms (shelterweakness, stormdanger,
attackunits, ..) was tuned together. Additionally for attack units a
finer granularity (factor 4) is used.

STC
ELO: 9.22 +-3.1 (95%) LOS: 100.0%
Total: 19514 W: 4340 L: 3822 D: 11352

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6399 W: 1192 L: 1056 D: 4151

Bench: 8224782

Resolves #184
 2015-01-03 03:33:02 +08:00
Stefan GeschwentnerandGary Linscott 3231038262 Big King Safety tuning 
ShelterWeakness and Stormdanger array are now indexed additionally by
file pair (a/h,b/g,c/f,d/e). The special case of king blocking a pawn
is incorporated in the StormDanger array.  Finally the 93 parameters
are tuned by SPSA on LTC.

STC
ELO: 3.46 +-2.2 (95%) LOS: 99.9%
Total: 40000 W: 8275 L: 7877 D: 23848

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 10311 W: 1876 L: 1721 D: 6714

Bench: 9498821

Resolves #163
 2014-12-21 01:53:44 +08:00