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Feature Request: No rules mode

I posted this a while ago, but it didn't get much attention.

A no rules mode, should just allow you to play with the chess board and [move / place] pieces exactly how you want.

No hardcoded chess rules, checks, promotions, etc.

Similar to the board editor, but multiplayer. And with perhaps a turn button to note who's turn it is.

This would be great to play any chess variation that we want. If we want pawns to move diagonally, there's nothing stopping us from playing that way.
How could you play? I mean, what's to stop my first move from capturing the enemy king?
The idea is that you decide how you want to play and which rules to follow with your opponent (friend). You manually follow the rules.

Nothing to stop anyone from cheating and moving pieces however they want in a no rule mode. That's what makes it great.
This is one of those ideas that only sounds good or feasible until you actually delve into how to implement it.

There can be no movement of pieces without hardcoding _something_. You need to find a way to dynamically create new rulesets which are coherent and which can actually be played and analyzed by the engine. Without those it's just an Analysis Board for two-players, but completely ignoring any illegal moves or positions.

Which is pointless. At that point you might not even be playing chess. You could very well say each piece moves only forward and diagonally, can only capture by jumping over other pieces and gain the ability to move backwards upon reaching the 8th rank, i.e., checkers/draughts.
You basically just described OTB chess. There you can cheat all you want as long as your opponent and arbiter allows it.
lichess.org/editor
Copy paste the game url and send it to your friends inbox.
Your opponent will see they have a message and will click on the url. They will move their piece and copy paste their url and sent it back to your inbox. The game continues and at the end, delete all your inbox urls. @Apostolique You now have a solution to your idea.
Amusing.

Mid-game, switch from one variant to another, an unwritten rule, by the way, such that you can suddenly win by simply declaring: "I'm going to switch to another variant so that I can win."

And then the other player says after that play: "But I switched to the anti-variant, so, you can't win."

And then we have an RPG which must be arbitrated by an obscure set of "rules," in some book written by a "Dungeon Master."

Rule 1.a.) You must support your friends or those you have agreements with over those who disagree with your interpretation of the rules.
Rule 1.b.) An exception to (Rule 1.a.) -- If you think someone came-up with a better counter-spell or rolled some randomly special dice combination, or doesn't speak with a stutter, or has a lisp and thus must have a higher game "level."

Addendum 24: Yeah, sorry, I just had to do it. It's too much fun to make fun of people who like to make-up their own "rules," because they don't like the rules, or want them to be adjustable, subjective, and cause conflict.

Example: "Oh, hey, I just made-up a new variant, but, I didn't cover all of the rules, so let's play my variant. If you're winning, I can make-up a new rule to supplement the game."

The simplest solution to problems like this is to indulge the winner: First, you need to make yourself a shelf to put your self-made accomplishment trophies. Second, any time you're feeling inadequate, go scrounge items from around your (cave) dwelling, and, throw-together something new to put on the shelf. Then go online and brag about it. If you can afford it, or are too lazy, just go to a trophy shop and commission another piece of junk to set on your shelf, or hang on a wall, and say: "Hey, look at me!"

Addendum 42: Yeah, sorry, I just had to do it. It's too much fun to make fun of people who need an excuse to feel special; the core reason behind needing to win (not have rules, or make "rules" entirely subjective).

You'd never know it from the crap I say, but, I am the "Dungeon Master." (You play by my rules.)
@Toscani Sounds like a good hack to achieve a working version of this mode. Good idea!

@everyone else. The idea isn't so much that there's no rules, and anyone can just do anything, but that the rules are instead agreed to by the two people playing.

And like some people have said, variants aren't chess anymore, but just games that can be played on a chess board with chess pieces. It's already possible to do OTB, but online, it's tricky to pull off.

And regarding what I said earlier with "Nothing to stop anyone from cheating and moving pieces however they want in a no rule mode. That's what makes it great." I didn't mean it like that, and most likely if your friend starts cheating, you probably won't want to play with them much more.

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