MadChess 2.0 Beta Build 069 (Bishop Pair)

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 Build Number WAC1 ELO Rating2 Improvement
Bishop Pair Evaluation 2015 Apr 15 72 275 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 43 275 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 35 242 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
  1. Win At Chess position test, 3 seconds per position
  2. Bullet chess, 2 min / game + 1 sec / move
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