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

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