Timeout victory with only a Bishop... isn't this supposed to be a draw for insufficient material?

The question speaks for itself. Is this a feature of Lichess? This is the game: lichess.org/Lehn99faiKvw

yes, but Lichess Rules work in a way, that any figure on board besides King is a victory on time

@immortal_coyote @aVague It's actually not an "only Lichess" feature. You can mate with only a bishop in your game, like this: lichess.org/analysis/8/6b1/8/4R3/8/8/B4P2/K1k5_b_-_-_4_65?color=white#130
(Your opponent underpromoted to a bishop and decided to suffocate himself. How sad.)

@aVague said in #2:
> yes, but Lichess Rules work in a way, that any figure on board besides King is a victory on time

If it's a king and bishop or a king and knight vs a lone king, It's still a draw since no checkmate is possible.

It's a difference between the USCF and FIDE rules regarding what constitutes "insufficient material". According to FIDE, If there is a checkmate possible, no matter how unlikely, it's considered sufficient material. According to USCF, sufficient material means you have enough material that you can theoretically force a checkmate if your opponent's pieces were all removed (thus a bishop alone is not considered sufficient).

This difference was highlighted in a game between Magnus Carlsen and Alireza Firouzja in the 2019 World blitz. Magnus Carlson only had a bishop, and Firouzja had three pawns and a bishop but ran out of time. According to FIDE, Magnus Carlsen won the game, however, had the tournament been played under USCF rules, it would have been a draw.

@Erlkonig1989 said in #4:
> If it's a king and bishop or a king and knight vs a lone king, It's still a draw since no checkmate is possible.
>
> It's a difference between the USCF and FIDE rules regarding what constitutes "insufficient material". According to FIDE, If there is a checkmate possible, no matter how unlikely, it's considered sufficient material. According to USCF, sufficient material means you have enough material that you can theoretically force a checkmate if your opponent's pieces were all removed (thus a bishop alone is not considered sufficient).
>
> This difference was highlighted in a game between Magnus Carlsen and Alireza Firouzja in the 2019 World blitz. Magnus Carlson only had a bishop, and Firouzja had three pawns and a bishop but ran out of time. According to FIDE, Magnus Carlsen won the game, however, had the tournament been played under USCF rules, it would have been a draw.
I know, but Lichess made it in that way obvious

@AOOP09 said in #3:
> @immortal_coyote @aVague It's actually not an "only Lichess" feature. You can mate with only a bishop in your game, like this: lichess.org/analysis/8/6b1/8/4R3/8/8/B4P2/K1k5_b_-_-_4_65?color=white#130
> (Your opponent underpromoted to a bishop and decided to suffocate himself. How sad.)
Good Thx a lot!

@AOOP09 said in #3:
... (Your opponent underpromoted to a bishop and decided to suffocate himself. How sad.)

There's something... poignantly absurd yet appropriate, about that.

This answers my question for me. Thanks all!

Coyote