diff --git a/src/search.cpp b/src/search.cpp index 2ae1c368..03af5d66 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -45,6 +45,7 @@ namespace Search { Color RootColor; Time::point SearchTime; StateStackPtr SetupStates; + Value Contempt[2]; // [bestValue > VALUE_DRAW] } using std::string; @@ -185,9 +186,8 @@ void Search::think() { RootColor = RootPos.side_to_move(); TimeMgr.init(Limits, RootPos.game_ply(), RootColor); - int cf = Options["Contempt Factor"] * PawnValueEg / 100; // From centipawns - DrawValue[ RootColor] = VALUE_DRAW - Value(cf); - DrawValue[~RootColor] = VALUE_DRAW + Value(cf); + Contempt[0] = Options["Contempt Factor"] * PawnValueEg / 100; // From centipawns + Contempt[1] = (Options["Contempt Factor"] + 12) * PawnValueEg / 100; if (RootMoves.empty()) { @@ -339,6 +339,9 @@ namespace { { bestValue = search(pos, ss, alpha, beta, depth * ONE_PLY, false); + DrawValue[ RootColor] = VALUE_DRAW - Contempt[bestValue > VALUE_DRAW]; + DrawValue[~RootColor] = VALUE_DRAW + Contempt[bestValue > VALUE_DRAW]; + // Bring the best move to the front. It is critical that sorting // is done with a stable algorithm because all the values but the // first and eventually the new best one are set to -VALUE_INFINITE