/// <summary>
/// 局面のハッシュキーを取得
/// </summary>
/// <param name="position"></param>
/// <param name="gikouBook"></param>
/// <returns></returns>
public static long ComputeKey(SPosition position, GikouBook gikouBook)
{
long key = 0;
SPosition pos = (SPosition)position.Clone();
// 後手番であれば、将棋盤を１８０度反転して、先手番として扱う
if (pos.Turn == PlayerColor.White)
{
pos.Flip();
}
// 盤上の駒
int gikout_sq = 0;
foreach (var sq in squareTable)
{
key += gikouBook.HashSeeds.GetPsq((int)pos.GetPiece(sq), gikout_sq);
gikout_sq += 1;
}
// 持ち駒
foreach (PlayerColor color in new PlayerColor[] { PlayerColor.Black, PlayerColor.White })
{
for (int pt = 1; pt < SPosition.HandMax; pt++)
{
for (int n = pos.GetHand(color, (PieceType)pt); n > 0; n--)
{
key += gikouBook.HashSeeds.GetHand((int)color, pt);
}
}
}
return(key);
}