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MadChess 2.0 Beta Build 069 (Bishop Pair)

By Erik Madsen April 13, 2015 at 9:03 PM February 5, 2022 at 9:29 PM Code

I added bishop pair evaluation to MadChess 2.0 Beta. The code awards a bonus for possessing two or more bishops, calibrated by game phase.

This added 18 Elo to the playing strength of MadChess 2.0 Beta.

MadChess 2.0                   2242 :   1280 (+561,=259,-460),  53.9 %

vs.                                 :  games (   +,   =,   -),   (%) :   Diff,  SD, CFS (%)
Glass 1.6                           :     80 (  12,  12,  56),  22.5 :   -219,  16,    0.0
RomiChess P3L                       :     80 (   8,  12,  60),  17.5 :   -215,  18,    0.0
OliThink 5.3.2                      :     80 (   7,  10,  63),  15.0 :   -202,  18,    0.0
Myrddin 0.87                        :     80 (  16,  19,  45),  31.9 :   -148,  17,    0.0
Sungorus 1.4                        :     80 (  28,  21,  31),  48.1 :    -68,  10,    0.0
Beowulf 2.4                         :     80 (  38,  17,  25),  58.1 :    +30,  14,   98.5
FireFly v2.6.0                      :     80 (  42,  14,  24),  61.3 :    +31,  10,   99.9
ZCT 0.3.2450                        :     80 (  35,  13,  32),  51.9 :    +36,  11,  100.0
Jazz v444                           :     80 (  30,  19,  31),  49.4 :    +38,  11,  100.0
Wing 2.0                            :     80 (  49,  16,  15),  71.3 :   +120,  11,  100.0
Brainless 1.0                       :     80 (  48,  21,  11),  73.1 :   +136,  19,  100.0
BikJump v2.01                       :     80 (  45,  23,  12),  70.6 :   +141,  12,  100.0
Matheus-2.3                         :     80 (  48,  14,  18),  68.8 :   +159,  14,  100.0
Monarch 1.7                         :     80 (  40,  22,  18),  63.8 :   +178,  11,  100.0
BigLion 2.23w                       :     80 (  58,  12,  10),  80.0 :   +215,  10,  100.0
Sharper 0.17                        :     80 (  57,  14,   9),  80.0 :   +227,  12,  100.0

Feature	Category	Date	Rev¹	WAC²	Elo Rating³	Improvement
Bishop Pair	Evaluation	2015 Apr 15	69	275	2242	+18
Free Passed Pawns	Evaluation	2015 Mar 10	59	270	2224	+31
Unstoppable Pawns Draws, Material Trades	Evaluation	2015 Jan 31	52	270	2193	+39
Late Move Pruning	Search	2015 Jan 10	44	273	2154	+39
History Heuristic Late Move Reductions	Search	2015 Jan 04	40	275	2115	+50
Killer Moves	Search	2015 Jan 03	38	275	2065	+61
Futility Pruning	Search	2014 Dec 29	37	256	2004	+54
Null Move Quiescence Recaptures	Search	2014 Dec 28	34	242	1950	+46
King Safety	Evaluation	2014 Dec 24	32	225	1904	+27
Piece Mobility	Evaluation	2014 Dec 16	29	225	1877	+64
Draw By Repetition Bug	Evaluation	2014 Dec 10	27	225	1813	+47
Passed Pawns	Evaluation	2014 Dec 09	26	225	1766	+72
Time Management	Search	2014 Dec 08	25	231	1694	+24
Delay Move Generation Aspiration Window Bug	Search	2014 Dec 02	23	231	1670	+44
MVV / LVA Move Order Draw By Insufficient Material Move List Overflow Bug	Search	2014 Dec 01	22	235	1626	+30
Tapered Evaluation MG and EG Piece Location	Evaluation	2014 Nov 29	21	234	1596	+107
Alpha / Beta Negamax Aspiration Windows Quiescence, Hash Material, Piece Squares	Baseline	2014 Nov 25	20	236	1489	–

Subversion source code revision
Win At Chess position test, 3 seconds per position
Bullet chess, 2 min / game + 1 sec / move

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