private Boards CopyAndMove(Boards boards, Move move)
{
Boards newBoards = new Boards(boards);
newBoards.SetTile_Small(move);
if (newBoards.GetWinner(move.board) != Game.EMPTY)
newBoards.SetTile_Big(move.board);
newBoards.lastmove = newBoards.GetWinner(move.tile)
== Game.EMPTY ? move.tile : -1;
newBoards.FillMoves();
return newBoards;
}