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Why is this a win for white? I thought Lichess recognized insufficient mating material when one side times out?

According to rules, he can checkmate you by some sequence of moves so the result is a win. Lichess really should make a separate section where they would explain these things because like half of the forum posts are about this...

FIDE rules, article 6.9: Except where one of Articles 5.1.1, 5.1.2, 5.2.1, 5.2.2, 5.2.3 applies, if a player does not complete the prescribed number of moves in the allotted time, the game is lost by that player. However, the game is drawn if the position is such that the opponent cannot checkmate the player’s king by any possible series of legal moves. - He can checkmate you by a sequence of moves

Specifically, white can mate you if you promote a knight:

lichess.org/editor/8/8/8/8/8/6K1/6B1/6nk%20b%20-%20-%2012%2066

Thanks for taking time to explain.

Well, this is according to rules, but looks like it doesn't work properly on lichess yet:

lichess.org/P6SpgmSX/white

There is no possible sequence of legal moves, which would result in a win for any side. Position is completely locked, so it's a draw, but the player that gets timed out are marked as losing one.

Similar here:

lichess.org/5N4RqFql/white

You're wrong about your first position:

3. Rf2 Bc7 4. Rf4 exf4+ and black can win without further help.
5. Kd3, e4-e5-e6-e7-e8=Q Bb6-c7-b8 Qc6#

With pieces on the board, even though the pawn chain is locked, there will be a sequence of legal moves that result in a win.

The 2nd position is a draw. A Fortress, that Comps do not understand. It seems the issue is being worked on by programmers (not lichess) to recognize the draw, besides better evaluating positions that programs will evaluate as winning, but in fact are dead drawn or sometimes even losing.

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