Not by that example, as all other moves were mates in 1 too. (bc6 Rxa7#)
Tbh AIs are indeed kind of weird, in that their mistakes tend towards random unsound moves when making a mistake rather than substandard plan in general. Still like playing even lowest variants without time; less pressure.
The AIs at 1-2 have been in my experience largely toothless, but I've still lost sometimes₁, especially under time controls. The 4 used to give me major difficulties with having to look 4 moves deep on each move, to the point where I didn't bother to aim higher. Feels like it has gotten bit weaker/easier tbh compared to when li was tenth the size.
While I don't have the experience to speculate whether 4 is rated properly (even with 60% rate), I'm not sure what timecontrol 1 is supposed to be 1350 at - bullet? Going by my 110-6-11 run, feels closer to 1000. At all other time controls, seems unlikely any 1350 would have 50% win-loss against it.
The 5 and especially 6 are "only on a (really) good day" for me. First is 7-3-14; second is 2-3-17; of those 2 wins only 1 without takebacks₂, and both of those 9 months ago on the same day. As a rule, I can't win even with takebacks; for 7 same applies to draws₃.
I concur that 6 blunders lot less than 5, but it does happen sometimes, in particularly as reciporal.
So, overall answer to OP: About 4 without time limits, I guess. Lower, depending on time control - I'd guess I require under 20 mins for lower levels typically, up to 60 (to lose) against higher levels.
I take my sharp drop against higher ones to be indicative of inability to build long-term attacks or some other consistent weakness that I can't help but fall prey to.
₁ Recent defeat versus 1: lichess.org/dTV2FN35/black#53
₂ Said lonely win against 6: lichess.org/YGuhsS5P/white
₃ Said lone draw with tons of takebacks against 7: lichess.org/SxRlXsDQ/white
Tbh AIs are indeed kind of weird, in that their mistakes tend towards random unsound moves when making a mistake rather than substandard plan in general. Still like playing even lowest variants without time; less pressure.
The AIs at 1-2 have been in my experience largely toothless, but I've still lost sometimes₁, especially under time controls. The 4 used to give me major difficulties with having to look 4 moves deep on each move, to the point where I didn't bother to aim higher. Feels like it has gotten bit weaker/easier tbh compared to when li was tenth the size.
While I don't have the experience to speculate whether 4 is rated properly (even with 60% rate), I'm not sure what timecontrol 1 is supposed to be 1350 at - bullet? Going by my 110-6-11 run, feels closer to 1000. At all other time controls, seems unlikely any 1350 would have 50% win-loss against it.
The 5 and especially 6 are "only on a (really) good day" for me. First is 7-3-14; second is 2-3-17; of those 2 wins only 1 without takebacks₂, and both of those 9 months ago on the same day. As a rule, I can't win even with takebacks; for 7 same applies to draws₃.
I concur that 6 blunders lot less than 5, but it does happen sometimes, in particularly as reciporal.
So, overall answer to OP: About 4 without time limits, I guess. Lower, depending on time control - I'd guess I require under 20 mins for lower levels typically, up to 60 (to lose) against higher levels.
I take my sharp drop against higher ones to be indicative of inability to build long-term attacks or some other consistent weakness that I can't help but fall prey to.
₁ Recent defeat versus 1: lichess.org/dTV2FN35/black#53
₂ Said lonely win against 6: lichess.org/YGuhsS5P/white
₃ Said lone draw with tons of takebacks against 7: lichess.org/SxRlXsDQ/white