I have some custom positions I would like to practice. "Practice with computer" is not necessarily the best option as Stockfish doesn't defend in losing positions (for example, gives up a rook in the Lucena). I tried https://lichess.org/@/maia9, as it's based on human play but 1900-level is just too weak. Can you recommend a good bot to practice endgames?
I think you can try BOT Try_to_beat_me_kid.
Download Lucaschess, set your position, and play against Maia (included)
Well there is also the possibility to exercise with another human being ;o)
If this is not possible, then I would simply exercise the more challenging defence separately. This is another example:
https://lichess.org/e6bLkarL/white#19
From a human perspective by far the most challenging defence is 10...Kxc6 (mate in 29), after White has to play carefully in order to prevent a long endgame Q vs R (After 11.Qa8+ Kc5 12.Qc8+! is the easiest way: for instance 12...Kd4 13.Qg4+ and White pushes the king down the board until finally Qc7+ forks collects the rook). But engine chooses 10...Kd5 (mate in 39), after which the conversion is trivial.
Out of curiosity I tried the same endgame on Lichess against Maia9 (the strongest version of Maia) hoping for 10...Kxc6, but Maia deviated earlier:
https://lichess.org/7yMu4SYz/white#8
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