private bool IsDrawInsufficientPieces()
{
bool N = false; //white knight
bool n = false; //black knight
bool B = false; //white bishop
bool b = false; //black bishop
bool BW = false; //white bishop on white square
bool bw = false; //black bishop on white square
foreach (Square square in m_board)
{
switch (m_board[square])
{
case Piece.WhiteKnight:
if (N)
{
return(false);
}
N = true;
break;
case Piece.BlackKnight:
if (n)
{
return(false);
}
n = true;
break;
case Piece.WhiteBishop:
if (B)
{
return(false);
}
B = true;
BW = Board.IsWhiteSquare(square);
break;
case Piece.BlackBishop:
if (b)
{
return(false);
}
b = true;
bw = Board.IsWhiteSquare(square);
break;
case Piece.None:
case Piece.WhiteKing:
case Piece.BlackKing:
//Nothing
break;
default:
return(false);
}
}
//only kings
if (!B && !b && !N && !n)
{
return(true);
}
//only kings and one bishop
if ((B && !b && !N && !n) || (!B && b && !N && !n))
{
return(true);
}
//only kings and one knight
if ((!B && !b && N && !n) || (!B && !b && !N && n))
{
return(true);
}
//only kings and one bishop on each side, both on squares with same color
if (B && b && !N && !n && (bw == BW))
{
return(true);
}
return(false);
}
