#2 thanks for formating the puzzles into hyperlinks for me.
@InkyDarkBird the engine evaluates 3 move repitition as 0.00 so it's easy to verify that it exists without checking where the repetition is.
#9 the puzzle you provided is a clear win for white since black has no adequate resource to defend against the queen and bishop. It's difficult for the puzzle to check that the solver has that knowledge due to multiple winning moves after kxb7.
Here is another bad puzzle
lichess.org/training/rjS4h
After bxc5 bxc5 Ka6! Kc8 it's clear that both b6 and b5 are both completely winning. b6 is obviously the better practical choice on account of b5 Kc7 when white will win the c-pawn and try to draw (however he is not fast enough). Also my engine has weighed in that b6 wins 3 moves faster than b5 :)
However b5 is the "correct" move...
@InkyDarkBird the engine evaluates 3 move repitition as 0.00 so it's easy to verify that it exists without checking where the repetition is.
#9 the puzzle you provided is a clear win for white since black has no adequate resource to defend against the queen and bishop. It's difficult for the puzzle to check that the solver has that knowledge due to multiple winning moves after kxb7.
Here is another bad puzzle
lichess.org/training/rjS4h
After bxc5 bxc5 Ka6! Kc8 it's clear that both b6 and b5 are both completely winning. b6 is obviously the better practical choice on account of b5 Kc7 when white will win the c-pawn and try to draw (however he is not fast enough). Also my engine has weighed in that b6 wins 3 moves faster than b5 :)
However b5 is the "correct" move...