/// <summary>Returns whether or not the checkers piece can be moved this turn.</summary>
/// <param name="piece">The checkers piece to test.</param>
/// <returns>True when piece can be moved.</returns>
public bool CanMovePiece(CheckersPiece piece)
{
if ((!isPlaying) && (winner == 0))
{
throw new InvalidOperationException("Operation requires game to be playing.");
}
if (piece == null)
{
throw new ArgumentNullException("piece");
}
if (!pieces.Contains(piece))
{
throw new ArgumentException("Argument 'piece' must be a piece in play to the current game.");
}
return(piece.Player == turn);
}
