/// <summary>
/// There are two ways to score. One is based on territory, the other on area.
/// This method uses the appropriate counting method according to the used ruleset and players' agreement.
/// </summary>
/// <param name="currentNode">Node of tree representing the previous move.</param>
/// <param name="deadPositions">List of dead stones.</param>
/// <param name="komi">Komi compensation.</param>
/// <returns>The score of players.</returns>
public override Scores CountScore(GameTreeNode currentNode, IEnumerable <Position> deadPositions, float komi)
{
Scores scores;
if (_countingType == CountingType.Area)
{
scores = CountArea(currentNode, deadPositions);
}
else
{
scores = CountTerritory(currentNode, deadPositions);
}
//passing = 1 bonus point to opponent
IEnumerable <GameTreeNode> history = currentNode.GetNodeHistory();
foreach (GameTreeNode node in history)
{
if (node.Move.Kind == MoveKind.Pass)
{
if (node.Move.WhoMoves == StoneColor.Black)
{
scores.WhiteScore++;
}
else if (node.Move.WhoMoves == StoneColor.White)
{
scores.BlackScore++;
}
}
}
scores.WhiteScore += komi;
return(scores);
}
/// <summary>
/// The territory of a player are those empty points on the board which are entirely surrounded by his live stones.
/// This method adds up total territory of players. The scores include prisoners and dead stones.
/// </summary>
/// <param name="currentNode">Node of tree representing the previous move.</param>
/// <param name="deadPositions">Positions marked as dead.</param>
/// <returns>The score of players, which does not include number of prisoners and dead stones.</returns>
protected Scores CountTerritory(GameTreeNode currentNode, IEnumerable <Position> deadPositions)
{
Scores scores = new Scores(0, 0);
//prisoners
IEnumerable <GameTreeNode> history = currentNode.GetNodeHistory();
foreach (GameTreeNode node in history)
{
if (node.Move.Captures.Count != 0)
{
if (node.Move.WhoMoves == StoneColor.Black)
{
scores.WhiteScore -= node.Move.Captures.Count;
}
else if (node.Move.WhoMoves == StoneColor.White)
{
scores.BlackScore -= node.Move.Captures.Count;
}
}
}
//dead stones
foreach (Position position in deadPositions)
{
if (RulesetInfo.BoardState[position.X, position.Y] == StoneColor.Black)
{
scores.BlackScore--;
}
else if (RulesetInfo.BoardState[position.X, position.Y] == StoneColor.White)
{
scores.WhiteScore--;
}
}
//regions
Scores regionScores = GetRegionScores(currentNode, deadPositions);
scores.WhiteScore += regionScores.WhiteScore;
scores.BlackScore += regionScores.BlackScore;
return(scores);
}