/// <summary>
/// Move quality
/// -1 worst move
/// 0 illegal move
/// +1 best move
/// </summary>
public static int MoveQuality(this TicTacToePosition position, TicTacToeLocation move)
{
if (position is null)
{
return(0);
}
if (move is null)
{
return(0);
}
var actual = MoveExpectation(position, move);
if (actual == GameOutcome.Illegal)
{
return(0);
}
var best = ExpectedWinner(position);
if (best == actual)
{
return(1);
}
else
{
return(-1);
}
}
/// <summary>
/// Move Degree, winning, loosing etc.
/// </summary>
public static MoveExpectancy MoveDegree(this TicTacToePosition position, TicTacToeLocation move)
{
if (position is null)
{
return(MoveExpectancy.Illegal);
}
if (move is null)
{
return(MoveExpectancy.Illegal);
}
if (!position.IsLegalMove(move, true))
{
return(MoveExpectancy.Illegal);
}
var expectation = MoveExpectation(position, move);
if (expectation == GameOutcome.Illegal)
{
return(MoveExpectancy.Illegal);
}
if (position.WhoIsOnMove == Mark.Cross)
{
if (expectation == GameOutcome.FirstWin)
{
return(MoveExpectancy.Win);
}
else if (expectation == GameOutcome.Draw)
{
return(MoveExpectancy.Draw);
}
else if (expectation == GameOutcome.SecondWin)
{
return(MoveExpectancy.Lose);
}
}
else
{
if (expectation == GameOutcome.FirstWin)
{
return(MoveExpectancy.Lose);
}
else if (expectation == GameOutcome.Draw)
{
return(MoveExpectancy.Draw);
}
else if (expectation == GameOutcome.SecondWin)
{
return(MoveExpectancy.Win);
}
}
return(MoveExpectancy.Illegal);
}
/// <summary>
/// Move Expectation
/// </summary>
public static GameOutcome MoveExpectation(this TicTacToePosition position, TicTacToeLocation move)
{
if (position is null)
{
return(GameOutcome.Illegal);
}
if (move is null)
{
return(GameOutcome.Illegal);
}
return(ExpectedWinner(position.MakeMove(move)));
}
/// <summary>
/// Is Move Legal
/// </summary>
public bool IsLegalMove(TicTacToeLocation move, bool checkForOutcome)
{
if (move is null)
{
return(false);
}
if (m_Marks[move.Index - 1] != Mark.None)
{
return(false);
}
if (checkForOutcome && Outcome != GameOutcome.None)
{
return(false);
}
return(true);
}
/// <summary>
/// Make Move
/// </summary>
public TicTacToePosition MakeMove(TicTacToeLocation move)
{
if (move is null)
{
throw new ArgumentNullException(nameof(move));
}
if (m_Marks[move.Index - 1] != Mark.None)
{
throw new InvalidOperationException("Illegal move");
}
if (Outcome != GameOutcome.None)
{
throw new InvalidOperationException("The game is over");
}
TicTacToePosition result = Clone();
result.m_Marks[move.Index - 1] = WhoIsOnMove;
return(result);
}
/// <summary>
/// Board
/// </summary>
/// <param name="line">Line</param>
/// <param name="column">Column</param>
/// <returns>Mark</returns>
public Mark this[TicTacToeLocation move] {
get => move is null
/// <summary> /// Is Move Legal /// </summary> public bool IsLegalMove(TicTacToeLocation move) => IsLegalMove(move, true);
