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New feature proposal: move back authorized/declined as a game option

Hi,

When I choose to play friend games, I do appreciate to be able to move back sometimes to keep the game interresting by cancelling a direct mistake, and of course, I accept the requests from my opponents. But some players do not accept and that's fair, they are not obliged to. But it is very frustrating to make a direct mistake in a challenging game and loose the benefit of a good game up to its end.

Anyway, both behaviours are acceptable, but it would be nice to be able to propose games with or without move backs, possibly also with an option to specify the number of automatically accepted move backs, and the maximum of move backs.

Examples:

0 999 existing behaviour: the opponent can accept or not move back requests, the maximum cannot be reasonnably reached or 999 is interpreted as for ever by Lichess
4 10 the fisrt 4 move back requests are accepted automatically, the next 6 ones may be accepted by the opponent or not, it is not possible to request more than 10 moves back

In ranked games, this remains interresting also with an additional option to declare winner the player who accepts the first move back. This would enable to finalise the game as a friend game, while the victory is accounted in the players rank. Alternatively, when a player accepts a move back, it may be possible for him to condition his acceptation to victory.