private ulong GetKnightMoves(int i, int j)
{
/*
* noNoWe noNoEa
+15 +17
| |
| noWeWe +6 __| |__+10 noEaEa
\ /
\ >0<
\ __ / \ __
\ soWeWe -10 | | -6 soEaEa
| |
| -17 -15
| soSoWe soSoEa
*/
int index = i * 8 + j;
ulong initialPos = 1UL << index;
ulong board = 0;
board |= BitBoardHelper.ShiftNorthNorthWest(initialPos);
board |= BitBoardHelper.ShiftNorthNorthEast(initialPos);
board |= BitBoardHelper.ShiftNorthWestWest(initialPos);
board |= BitBoardHelper.ShiftNorthEastEast(initialPos);
board |= BitBoardHelper.ShiftSouthWestWest(initialPos);
board |= BitBoardHelper.ShiftSouthEastEast(initialPos);
board |= BitBoardHelper.ShiftSouthSouthWest(initialPos);
board |= BitBoardHelper.ShiftSouthSouthEast(initialPos);
return(board);
}