Originally posted by Mephisto2
This is a tough one. I would be very surprised (but I am used to surprises, lol) if anyone could solve this without the help of a machine, let alone compose this without the help of machine(s). Only, you have to use the engine to calculate the outcome of your your ideas, not to let them find them.
Actually, not using engines is the way to solve it, because engine evaluations are either completely wrong or completely useless
Therefore, you may use engines at will, because they cannot spoil the fun of solving.
By the way, the study has been solved in CSS forum...
Hint: 1.Nb7 is a draw