public float Evaluate(Board Current, int Move)
{
int Value = 0;
// value of move
for (int Plays = 0; Plays < NumberOfPlayouts; Plays++)
{
Board MCPlayout = Current.Clone();
MCPlayout.Move(Move);
State Winner = Expand(MCPlayout);
if (Winner == Current.CurrentPlayer)
Value++; // win means +1
else if (Winner == Current.CurrentOpponent)
Value--; // loss means -1
}
return (Value / (float)NumberOfPlayouts); // project into [-1,1]
}
public static List<int> PreprocessMoves(Board Current, List<int> TestCandidates)
{
List<int> CandidateMoves = new List<int> { };
foreach (int Move in TestCandidates)
{
Board CheckWin = Current.Clone();
// test if immediate win possible
CheckWin.Move(Move);
if (CheckWin.TestVictory() == Current.CurrentPlayer)
{
CandidateMoves.Add(Move);
return CandidateMoves;
}
else
{
// test if we make an assist for our opponent
List<int> OpponentMoves = CheckWin.GetValidMoves();
bool IsBad = false;
foreach (int OMove in OpponentMoves)
{
Board Tmp = CheckWin.Clone();
Tmp.Move(OMove);
// did we make an assist?
if (Tmp.TestVictory() == Current.CurrentOpponent)
{
// forget the move!
IsBad = true;
break;
}
}
if (!IsBad)
{
CandidateMoves.Add(Move);
}
}
}
return CandidateMoves;
}
/// <summary>
/// returns a move by minimax and deep cuts
/// </summary>
/// <remarks>
/// THIS IS STILL BUGGY!!!
/// </remarks>
/// <param name="CurrentSituation">current game situation</param>
/// <returns>move to play</returns>
public override int Play(Board CurrentSituation)
{
Scores.SetStrength(100);
CP = CurrentSituation.CurrentPlayer;
List<int> CandidateMoves = CurrentSituation.GetValidMoves();
TProcess.Maximum = CandidateMoves.Count;
TProcess.Value = 0;
float value = float.MinValue;
int ColumnToPlay = -1;
WorkingBoard = CurrentSituation.Clone();
foreach (int M in CandidateMoves)
{
TProcess.PerformStep();
float eval = ScoreMove(M, 0, float.MinValue, float.MaxValue);
//MessageBox.Show(value.ToString());
if (eval > value)
{
value = eval;
ColumnToPlay = M;
}
}
return ColumnToPlay;
}
