MadChess 2.0 Beta Build 034 (Null Move)

I added null move search to MadChess 2.0 Beta. In addition, I limited the quiescence search to recaptures if the distance from the horizon is four or more moves. If the king is in check, all moves are searched. If not, and the distance from the horizon is four or more moves, only recaptures are searched (captures of the last piece that moved).

These enhancements added 46 ELO to the playing strength of MadChess 2.0 Beta.

MadChess 2.0                   1950 :    800 (+271,=150,-379),  43.3 %

vs.                                 :  games (   +,   =,   -),   (%) :   Diff,  SD, CFS (%)
BikJump v2.01                       :    100 (  23,  20,  57),  33.0 :   -132,  12,    0.0
Matheus-2.3                         :    100 (  27,  17,  56),  35.5 :   -114,  12,    0.0
Monarch 1.7                         :    100 (  22,  17,  61),  30.5 :    -95,  13,    0.0
BigLion 2.23w                       :    100 (  27,  20,  53),  37.0 :    -64,  11,    0.0
Faile 1.4                           :    100 (  36,  27,  37),  49.5 :    -50,  10,    0.0
Sharper 0.17                        :    100 (  46,  15,  39),  53.5 :    -37,  12,    0.1
Jabba13032012                       :    100 (  48,   9,  43),  52.5 :    +16,  11,   92.1
Roce 0.0390                         :    100 (  42,  25,  33),  54.5 :    +90,  11,  100.0
Feature Category Date Build Number WAC1 ELO Rating2 Improvement
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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