public static RowCol NextMove(Board board, IPlayer me, IPlayer opp)
{
// this is similar to of MyMove but with logging and multithreading
var moves = new Dictionary<RowCol, int> ();
var legalMoves = board.GetLegalMoves ();
int count = 0;
Console.WriteLine ("Starting move assessment ({0} to assess)", legalMoves.Count ());
var semaphore = new SemaphoreSlim (4);
var tasks = new Task[legalMoves.Count ()];
foreach (var move in legalMoves)
{
var count1 = ++count;
tasks[count1-1] = Task.Run (() =>
{
semaphore.Wait();
Console.WriteLine ("{0} starting (option {1}/{2})", move, count1, legalMoves.Count ());
var b = board.Play (me, move);
var isGameOver = b.IsGameOver (me);
int value;
if (isGameOver == GameEnd.Win)
value = int.MaxValue; // if we can win, take it now!
else if (isGameOver == GameEnd.Tie)
value = 0;
else
value = OppMove (b, me, opp);
moves [move] = value;
Console.WriteLine ("{0} scores {1} (option {2}/{3})", move, value, count1, legalMoves.Count ());
semaphore.Release();
});
}
Task.WaitAll (tasks);
var bestMove = null as RowCol;
int best = -1;
foreach (var kvp in moves)
if (kvp.Value > best)
{
best = kvp.Value;
bestMove = kvp.Key;
}
if (bestMove != null)
Console.WriteLine ("The best move is {0}, with a score of {1}", bestMove, best);
else
{
Console.WriteLine ("All moves should result in losing, choosing randomly");
bestMove = legalMoves [new Random ().Next (legalMoves.Count)];
}
return bestMove;
}
private static int MyMove(Board board, IPlayer me, IPlayer opp)
{
var moves = new Dictionary<RowCol, int> ();
var legalMoves = board.GetLegalMoves ();
foreach(var move in legalMoves)
{
var b = board.Play (me, move);
var isGameOver = b.IsGameOver (me);
if (isGameOver == GameEnd.Win)
return 1;
else if (isGameOver == GameEnd.Tie)
return 0;
moves [move] = OppMove (b, me, opp);
}
return moves.Any (kvp => kvp.Value == -1) ? -1 : moves.Sum (kvp => kvp.Value);
}