The rarest endgame of all time (7 pieces or less)

What's the endgame you're getting the lease number of times that you'd nearly never get in a real game?

And just curious, what's the endgame that needs the biggest number of moves to be won ( more than 50 moves, with the 50 moves rule disabled)?

From endgame tablebases (with 7 pieces) the position in en.wikipedia.org/wiki/Endgame_tablebase#Endgame_theory was found, where you need 546 moves to win (with perfect play from both sides). Ohter notable examples are listed there.

My rarest endgame, that I never had to play before, is K+N+B vs K. Luckily you can train this very position on Lichess :)

There are some mates >500 moves.

www.reddit.com/r/chess/comments/bepu14/white_to_mate_in_549_longest_7piece_forced_mate/

K vs. K + 5 Bishops of the same color you don’t see every day.

@Sarg0n said in #4:
> K vs. K + 5 Bishops of the same color you don’t see every day.
Except by promoting multiples bishops on the same squares, this endgames is impossible to get!

What about nine bishops of the same color? :)

@The_Daethalus said in #6:
> What about nine bishops of the same color? :)
The thread title was 7 pieces or less.

@Sarg0n said in #4:
> K vs. K + 5 Bishops of the same color you don’t see every day.

He said every day, and I meant you don't see one with K and K + 9 bishops of the same color every day either. I suppose I should have said that I was disregarding the seven piece limit, so I understand what you're saying.

@Sybotes

@The_Daethalus said in #6:
> What about nine bishops of the same color? :)

You would give away 4 of those bishops so you fit into the 7 pieces of less requirement!

Not a standard game but a from position its surprisingly unclear despite the material imbalance.
Anyway white got 3bishops of the same colour here i show the position i talk about 3bishops versus a queen which is ofcourse pretty unlikely to happen in a actualy game but it can be a draw vs a queen if the king is in the corner of the colour of the bishops and if the setup is like Bc1 Bb2 Ba3.
Some write books 100 endings you need to know this could be in a book about endings you don't need to know.
But i find i personally interesting that 3bishops of the same colour is a easy draw vs the king if the king is in the right corner which means on the colour of the bishops.
Bc1 is kinda weird after g1queen but technical its just a fairly easy draw no way the king ever comes in but surely almost everyone would just do Bxg1 in "real" game:).
But its still interesting to me at least that 3bishops of the same colour can hold the endgame versus a queen maybe its not winning where your looking for but this is in the category very rare endings still a interesting fact to know that 3bishops of the same colour can easily hold vs a queen in the right position.