What is the hardest endgame to win?

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ayanb2012

What is the hardest endgame to win? Queen vs rook? 2 knights vs 1 pawn? 1 bishop and a knight? Let me know your answers.

JETINATE
Queen vs rook or 2 knights vs one pawn
JETINATE
2 knights vs one pawn is like mate in 10-40 depending on the position
shadowtanuki

The one where you're down a lot of material and in a bad position

Pawn908

Bishop versus bishop of opposite color endgames can be pretty difficult to win. ♟️

thing50

Endgames with multiple queens both sides go beyond human understanding according to Jon Speelman...he studied them with the tablebase's and was clueless as to what was going on according to his endgame book 'Batsfords chess endings' which he co-wrote with Tisdall and Wade.

Nerwal

In practice, queen endgames (especially Q+P vs Q). Lots of checks and quickly you get completely exhausted calculating all the lines.

In theory, excluding more complicated situations (like R+B+N vs R+other color bishop), 2B vs N and some R+B vs R endgames like the Crosskill position. This is barely understandable.