Idk if theres a "rarest" checkmate, maybe a small percent of ppl using it can be considered rare. If I had to choose one I would probably choose the double knight forced mate :/
What's the rarest kind of checkmate?
Double Ambiguous Bishop en passant mate. its real. look up, what is the rarest move in chess.
Those are pretty common.
What's rare is the en passant triple sacrifice leading to a knight promotion smothered mate. That you don't see too often.
I once accidentally did a single knight and 1 pawn checkmate
So here white had 28 points of extra material still lost anyway I think that's the rarest checkmate in that kind of position where everyone thinks you're losing
It is only half related to this question but this video is really cute and well made. I hope you enjoy it as much as I did.
https://www.chess.com/analysis/game/pgn/4xeP3dnppn?tab=analysis&move=0
I think it gaves error when you look at this position.
Like when you play b3+ and they play d5 you take en passant. I don't think nobody did anything like that.
The rarest kind of checkmate is probably the one that was in the daily puzzle today. The one where a knight delivers checkmate, and a knight and bishop both cover the lone escape square. With a queen sacrifice.
I'll bet nobody has ever seen one of those before.