🕸📝Fergus Duniho wrote on Sun, Mar 12, 2023 08:22 PM UTC:
As things work right now, it is possible to take back moves, because when you do, it will replay all the canonical moves and skip over the moves that were taken back, recalculating game data as each move is made. But suppose you're evaluating each move only once, using constants to keep track of game information like whether certain pieces have already moved, and someone takes back a move that changed some of the information stored in the constants. You would either have to restore the game data to what it used to be, which could become rather tricky, or give up the ability to take back moves that do change game data.
As things work right now, it is possible to take back moves, because when you do, it will replay all the canonical moves and skip over the moves that were taken back, recalculating game data as each move is made. But suppose you're evaluating each move only once, using constants to keep track of game information like whether certain pieces have already moved, and someone takes back a move that changed some of the information stored in the constants. You would either have to restore the game data to what it used to be, which could become rather tricky, or give up the ability to take back moves that do change game data.