Multiple premoves

[dav1312]

To avoid opening a duplicate issue (#3890) to suggest it again, I decided to open a discussion.

This has been requested by the community for more than 7 years

• https://lichess.org/forum/lichess-feedback/multiple-premoves-in-one-turn
• https://lichess.org/forum/lichess-feedback/multiple-premoves

As some user suggested, this can be as simple as an option in the game behavior settings.
Adding this feature can also make it easier for users that want to switch to Lichess from other websites and disencourage people from using extensions.

[benediktwerner]

Making this an option avoids none of the reasons to not add it (more complex code, single-premoves having higher skill ceiling, and working better with no-time premoves). In fact, it's even worse since it would add more options and require even more code to handle both methods.

[dav1312]

I think the pros outweigh the cons, at least community-wise.
It will obviously be something hard to implement, a challenge for the developers, but the users will greatly appreciate it.
From some of the videos that I've seen of people using extensions, it's basically an arrow indicating the premove and it automatically makes the next premove when your premove is done. Something like that doesn't sound too hard to implement, it still is just one premove in its core and at the same time, it enables the multi-premove functionality.