private BackgammonBoard(BackgammonBoard source)
{
WhitePlayer = source.WhitePlayer;
BlackPlayer = source.BlackPlayer;
CurrentColor = source.CurrentColor;
Winner = source.Winner;
GameOver = source.GameOver;
GameStarted = source.GameStarted;
Gammon = source.Gammon;
Backgammon = source.Backgammon;
CurrentRoll = source.CurrentRoll;
LastRoll = source.LastRoll;
remainingRollNumbers = new List <int>(source.remainingRollNumbers);
board = new Point[24];
for (int pos = 0; pos <= 23; pos++)
{
board[pos] = new Point(source.board[pos]);
}
bar = new List <Checker>();
foreach (var c in source.bar)
{
bar.Add(new Checker(c));
}
offBoard = new List <Checker>();
foreach (var c in source.offBoard)
{
offBoard.Add(new Checker(c));
}
startRollNumbers = new Dictionary <CheckerColor, int>(source.startRollNumbers);
}
public List <(int, int)> GetAllMoves()
{
// A player must use both numbers of a roll if this is legally possible
// (or all four numbers of a double).
// When only one number can be played, the player must play that number.
// Or if either number can be played but not both,
// the player must play the larger one.
// When neither number can be used, the player loses his turn.
// In the case of doubles, when all four numbers cannot be played,
// the player must play as many numbers as he can.
var allMoves = new List <(int, int)>();
if (GameStarted && !GameOver && remainingRollNumbers.Any())
{
if (HasCheckersOnBar())
{
if (remainingRollNumbers.Count == 1 ||
remainingRollNumbers[0] == remainingRollNumbers[1])
{
allMoves.AddRange(GetAllMoves(remainingRollNumbers[0]));
}
else
{
allMoves.AddRange(GetAllMoves(remainingRollNumbers[0]));
allMoves.AddRange(GetAllMoves(remainingRollNumbers[1]));
}
}
else if (remainingRollNumbers.Count == 1 ||
remainingRollNumbers[0] == remainingRollNumbers[1])
{
allMoves.AddRange(GetAllMoves(remainingRollNumbers[0]));
}
else if (IsInHomeboard())
{
allMoves.AddRange(GetAllMoves(remainingRollNumbers[0]));
allMoves.AddRange(GetAllMoves(remainingRollNumbers[1]));
}
else
{
bool onlyMaxAllowed = false;
var max = Math.Max(remainingRollNumbers[0], remainingRollNumbers[1]);
var min = Math.Min(remainingRollNumbers[0], remainingRollNumbers[1]);
var maxMoves = GetAllMoves(max);
var minMoves = GetAllMoves(min);
if (maxMoves.Any() && minMoves.Any())
{
onlyMaxAllowed = true;
foreach (var move in minMoves)
{
var temp = new BackgammonBoard(this);
temp.MoveInternal(move.Item1, move.Item2);
var tempMaxMoves = temp.GetAllMoves(max);
if (tempMaxMoves.Any())
{
onlyMaxAllowed = false;
break;
}
}
}
allMoves.AddRange(maxMoves);
if (!onlyMaxAllowed)
{
allMoves.AddRange(minMoves);
}
}
}
return(allMoves);
}
