MadChess 2.0 Beta Build 023 (Delay Move Generation)

I added code to delay move generation if a cached position specifies a best move. The best move is played first. If it causes a beta cutoff, the expense of generating moves is avoided. If not, moves are generated and searched, skipping the best move, which has already been searched.

Also, I corrected a bug that caused all searches to use an infinite aspiration window.  The corrected code will search the first ply using an infinite aspiration window, then search subsequent plies with a narrow window around the first ply’s score.  If the score of subsequent searches lies on an aspiration boundary, the window gradually is widened from 50 to 200 to 500 to infinite centipawns.

This added 44 Elo to the playing strength of MadChess 2.0 Beta

MadChess 2.0                   1670 :    800 (+64,=100,-636),  14.3 %

vs.                                 :  games (  +,   =,   -),   (%) :   Diff,  SD, CFS (%)
BikJump v2.01                       :    100 (  1,   7,  92),   4.5 :   -413,  17,    0.0
Matheus-2.3                         :    100 (  6,  13,  81),  12.5 :   -389,  16,    0.0
Monarch 1.7                         :    100 (  3,  10,  87),   8.0 :   -368,  17,    0.0
BigLion 2.23w                       :    100 ( 11,  11,  78),  16.5 :   -335,  14,    0.0
Faile 1.4                           :    100 (  3,  15,  82),  10.5 :   -330,  14,    0.0
Sharper 0.17                        :    100 ( 12,   9,  79),  16.5 :   -318,  16,    0.0
Jabba13032012                       :    100 ( 15,  12,  73),  21.0 :   -259,  15,    0.0
Roce 0.0390                         :    100 ( 13,  23,  64),  24.5 :   -184,  14,    0.0

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