Contempt Factor is more effective at opening/middle game
and seems harmful at endgame phase. See:
http://chessprogramming.wikispaces.com/Contempt+Factor
http://web.archive.org/web/
20070707023203/www.brucemo.com/compchess/programming/contempt.htm
Therefore we scale down the contempt factor while going
on with the game so to reach zero at endgame phase.
No functional change.
Position& pos = RootPosition;
Chess960 = pos.is_chess960();
Eval::RootColor = pos.side_to_move();
- Eval::ValueDraw[ Eval::RootColor] = VALUE_DRAW - Eval::ContemptFactor;
- Eval::ValueDraw[~Eval::RootColor] = VALUE_DRAW + Eval::ContemptFactor;
+ int scaledCF = Eval::ContemptFactor * MaterialTable::game_phase(pos) / PHASE_MIDGAME;
+ Eval::ValueDraw[ Eval::RootColor] = VALUE_DRAW - Value(scaledCF);
+ Eval::ValueDraw[~Eval::RootColor] = VALUE_DRAW + Value(scaledCF);
TimeMgr.init(Limits, pos.startpos_ply_counter(), pos.side_to_move());
TT.new_search();
H.clear();