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Fairy-Max is a derivative of the normal Chess engine micro-Max. This is
listed with a computer rating of slightly over 2000 at CCRL. It is not
really known how this corresponds to human ratings. The top engines on that
list are rated nearly 3300. At 10x8 Chess Fairy-Max is about 400 elo weaker
than my dedicated engine for this variant, Joker80. This is again derived
from my normal-Chess engine Joker, which is indeed rated around 2400 at
CCRL.

All I can say is that Fairy-Max should be beatable by a good club player at
normal Chess. But like playing any computer, you should play very secure,
and avoid tactical complications, as computers are very resourceful in
tactics.

To dumb it down a bit, you can give it shorter time. Either just set it for
a few seconds for 40 moves, and ignore your own clock, or specify the time
the human is supposed to obey, and define a large time-odds factor for
fairy-max (= engine #1). Like 40 moves per hour, and then a time odds of
120, so that Fairy-Max should do the 40 moves in 30 sec.

Of course even strong Chess players are likely to be a lot weaker at Spartan Chess then orthodox Chess, as humans rely a lot on memory and experience. While Fairy-Max could not care less whether it plays Spartan or FIDE, as it has no specific knowledge for either.