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I have not understood if the name of this game is Makpong or Simplified Makpong. If it is Simplified M., what is Makpong?

Also, I am not sure to well understand the most important rule:

The King may capture an attacking piece if in range, but cannot capture out of double check.

what means "if in range"? Does that just means that the King may capture an attacking piece? If the attacking piece is not 1-square away from the King I don't see how the K would have been able to capture it anyway.

and what means "capture out of double check". Here I understand that if 2 pieces are attacking the K, he cannot capture both of them. But that is trivial too, no?

So I guess that the important rule is that when a K is under check he can capture the attacking piece but it is forbidden to move the K out of check, to interpose a piece between the K and the attacking piece, or to take the attacking piece with another piece than the K. Is it correct? Or to say that when a K is under check, the only authorized move is if the K can capture the attacking piece.

Would it be possible to re-write this with no ambiguity?

Thank you

I first learned about "Makpong" on Github from this pull request:

https://github.com/cutechess/cutechess/pull/626

The only real problem I have with this is that it still has the counting rule from Makruk. It's a little confusing and I can't describe it very well so I hope this wiki article describes it well enough for you.

https://en.wikipedia.org/wiki/Makruk

With my proposed simplification the counting rule gets removed. The 50 move rule and 3-fold repetition we all know and love takes its place instead.

what means "if in range"? Does that just means that the King may capture an attacking piece? If the attacking piece is not 1-square away from the King I don't see how the K would have been able to capture it anyway.

You're right. The K may only move out of a check if it can capture its (singular) attacker.

If the attacking piece is more than 1 square away, it obviously can't.

and what means "capture out of double check". Here I understand that if 2 pieces are attacking the K, he cannot capture both of them. But that is trivial too, no?

It means that if the K is double checked, it is not allowed to move out of the double check. Not even by capturing one of the attackers.

So I guess that the important rule is that when a K is under check he can capture the attacking piece but it is forbidden to move the K out of check, to interpose a piece between the K and the attacking piece, or to take the attacking piece with another piece than the K. Is it correct? Or to say that when a K is under check, the only authorized move is if the K can capture the attacking piece.

I'll rewrite it to be more clear.

The important rule is that K can't move out of a check, except when it can capture its (singular) attacker. Other pieces are free to move, provided they're legal moves.

interpose a piece between the K and the attacking piece

This is legal.

take the attacking piece with another piece than the K

Also legal.

Thank you. So, I see that I had not understood everything right.

Maybe an idea if I change the name to reduce confusion in the future?

Also I have already changed some lines to make the rules more clear, but maybe there are some other additions I can make.