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Scale contempt factor to zero at endgame

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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.
This commit is contained in:
Marco Costalba
2012-10-13 10:40:38 +02:00
parent aba152ea3a
commit 6c8663341e
1 changed files with 3 additions and 2 deletions
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5
src/search.cpp
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@@ -175,8 +175,9 @@ void Search::think() {
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();