Hi Pilou,

> But possible in theory without time limit?

Sure! But it's hard to come by that unlimited time in practice though! ;)

And actually it could be somewhat difficult to implement, selection code could probably separate things into different groups but it might have some difficulty deciding which of the groups are meant to be kept and which are meant to be discarded. The Offset command is able to do that better because it does extra work to keep track of where pieces originated from.

But at any rate, it would take me far longer to implement it than the amount of time that it would save you.

- Michael