internal static void SaveCurrentGameMove(Board currentBoard, Board previousBoard,
ICollection <OpeningMove> gameBook, MoveContent bestMove)
{
try
{
var move = new OpeningMove
{
StartingFEN = Board.Fen(true,
previousBoard),
EndingFEN = Board.Fen(true,
currentBoard)
};
move.Moves.Add(bestMove);
gameBook.Add(move);
foreach (var move1 in gameBook)
{
byte repeatedMoves = 0;
foreach (var move2 in gameBook)
{
if (move1.EndingFEN == move2.EndingFEN)
{
repeatedMoves++;
}
}
if (previousBoard.RepeatedMove >= repeatedMoves)
{
continue;
}
previousBoard.RepeatedMove = repeatedMoves;
currentBoard.RepeatedMove = repeatedMoves;
}
if (currentBoard.RepeatedMove >= 3)
{
currentBoard.StaleMate = true;
}
}
catch (Exception)
{
// ignored
}
}
// ReSharper disable IdentifierTypo
internal static MoveContent IterativeSearch(Board examineBoard,
byte depth,
ref int nodesSearched,
ref int nodesQuiessence,
ref string pvLine,
ref byte plyDepthReached,
ref byte rootMovesSearched,
List <OpeningMove> currentGameBook)
{
var pvChild = new List <Position>();
var alpha = -400000000;
const int beta = 400000000;
var bestMove = new MoveContent();
//We are going to store our result boards here
var succ = GetSortValidMoves(examineBoard);
rootMovesSearched = (byte)succ.Positions.Count;
if (rootMovesSearched == 1)
{
return(succ.Positions[0].LastMove);
}
foreach (var pos in succ.Positions)
{
var value = -AlphaBeta(pos,
1,
-beta,
-alpha,
ref nodesSearched,
ref nodesQuiessence,
ref pvChild,
true);
//Can I make an instant mate?
if (value >= 32767)
{
return(pos.LastMove);
}
}
var currentBoard = 0;
alpha = -400000000;
succ.Positions.Sort(Sort);
depth--;
plyDepthReached = ModifyDepth(depth, succ.Positions.Count);
foreach (var pos in succ.Positions)
{
currentBoard++;
progress = (int)(currentBoard / (decimal)succ.Positions.Count * 100);
pvChild = new List <Position>();
var value = -AlphaBeta(pos,
depth,
-beta,
-alpha,
ref nodesSearched,
ref nodesQuiessence,
ref pvChild,
false);
if (value >= 32767)
{
return(pos.LastMove);
}
if (examineBoard.RepeatedMove == 2)
{
var fen = Board.Fen(true, pos);
foreach (var move in currentGameBook)
{
if (move.EndingFEN == fen)
{
value = 0;
break;
}
}
}
pos.Score = value;
//If value is greater then alpha this is the best board
// ReSharper disable once InvertIf
if (value > alpha || alpha == -400000000)
{
pvLine = pos.LastMove.ToString();
foreach (var pvPos in pvChild)
{
pvLine += " " + pvPos.ToString();
}
alpha = value;
bestMove = pos.LastMove;
}
}
plyDepthReached++;
progress = 100;
return(bestMove);
}