/// <summary>
/// Returns the estimated material exchange value of the given move on the
/// given position as determined by static analysis.
/// </summary>
/// <param name="position">The position the move is to be played on.</param>
/// <param name="move">The move to evaluate.</param>
/// <returns>The estimated material exchange value of the move.</returns>
private static Int32 EvaluateStaticExchange(Position position, Int32 move)
{
Int32 from = Move.From(move);
Int32 to = Move.To(move);
Int32 piece = Move.Piece(move);
Int32 capture = Move.Capture(move);
position.Bitboard[piece] ^= 1UL << from;
position.OccupiedBitboard ^= 1UL << from;
position.Square[to] = piece;
Int32 value = 0;
if (Move.IsPromotion(move))
{
Int32 promotion = Move.Special(move);
position.Square[to] = promotion;
value += PieceValue[promotion] - PieceValue[Piece.Pawn];
}
value += PieceValue[capture] - EvaluateStaticExchange(position, 1 - position.SideToMove, to);
position.Bitboard[piece] ^= 1UL << from;
position.OccupiedBitboard ^= 1UL << from;
position.Square[to] = capture;
return(value);
}
/// <summary>
/// Returns the move specified by the given information.
/// </summary>
/// <param name="position">The position the move is to be played on.</param>
/// <param name="from">The initial square of the move.</param>
/// <param name="to">The final square of the move.</param>
/// <returns>The move specified by the given information.</returns>
private Int32 CreateMove(Position position, Int32 from, Int32 to)
{
foreach (Int32 move in position.LegalMoves())
{
if (from == Move.From(move) && to == Move.To(move))
{
Int32 special = Move.Special(move);
if (Move.IsPromotion(move))
{
switch (SelectionBox.Show("What piece would you like to promote to?", "Queen", "Rook", "Bishop", "Knight"))
{
case "Queen":
special = position.SideToMove | Piece.Queen;
break;
case "Rook":
special = position.SideToMove | Piece.Rook;
break;
case "Bishop":
special = position.SideToMove | Piece.Bishop;
break;
case "Knight":
special = position.SideToMove | Piece.Knight;
break;
}
}
return(Move.Create(position, from, to, special));
}
}
return(Move.Invalid);
}
/// <summary>
/// Animates the given move between the given initial and final locations.
/// </summary>
/// <param name="move">The move to animate.</param>
/// <param name="initial">The initial location of the moving piece.</param>
/// <param name="final">The final location of the moving piece.</param>
private static void Animate(Int32 move, Point initial, Point final)
{
VisualPiece piece = null;
lock (PiecesLock)
for (Int32 i = 0; i < _pieces.Count; i++)
{
if (_pieces[i].IsAt(initial))
{
piece = _pieces[i];
break;
}
}
new Thread(new ThreadStart(() => {
piece.MoveTo(final);
if (Move.IsPromotion(move))
{
piece.Promote(Move.Special(move));
}
}))
{
IsBackground = true
}.Start();
}
