private double HeuristicEval(BoardStates player, OthelloGame game)
{
//Based of features of the board that humans have identified.
//Hints of evaluation from any source I could find
//idealy these could me optimized using a genetic algorithm,
//but that is a different project
const int searchableDepthOverride = 2; //override min-max in favor of complete evaluation
const int endGame = 20; //<20 moves is endgame
const int midGame = 40; // 20 moves in is midgame
double value = 0;
int empty = game.GetPieceCount(BoardStates.empty);
if (game.GameComplete)
{
return(CompleteEval(player, game));
}
else if (empty < searchableDepthOverride)
{
return(MinimaxAlphaBeta(game, searchableDepthOverride, int.MinValue, int.MaxValue, player));
}
value += coinDiffWeight * Math.Pow((game.GetPieceCount(player) - game.GetPieceCount(~player) + empty - coinDiffOffset), coinDiffPower);
value += cornerDiffWeight * Math.Pow((game.GetCornerCount(player) - game.GetCornerCount(~player) + empty - cornerDiffOffset), cornerDiffPower);
value += nearCornerDiffWeight * Math.Pow((game.GetAdjCornerCount(player) - game.GetAdjCornerCount(~player) + empty - nearCornerDiffOffset), nearCornerDiffPower);
value += avalibleMoveDiffWeight * Math.Pow((game.GetPossiblePlayList(player).Count() - game.GetPossiblePlayList(~player).Count() + empty - avalibleMoveDiffOffset), avalibleMoveDiffPower);
value += nonTurnableCoinDiffWeight * Math.Pow((game.GetSafePeiceCountEstimation(player) - game.GetSafePeiceCountEstimation(~player) + empty - nonTurnableCoinDiffOffset), nonTurnableCoinDiffPower);
value += ControlledCornerDiffWeight * Math.Pow((game.GetControlledCorners(player) - game.GetControlledCorners(~player) + empty - ControlledCornerDiffOffset), ControlledCornerDiffPower);
return(value);
}