How to turn any engine into a Fruit clone

I got an email from a guy named Jerry Obviosov. I don't know why he chose me to write to. He tells me he has partially disassembled Rocket 3 and has found many interesting secrets of this great engine. But since the reverse engineering process is so difficult and time consuming, he will not disassemble it completely. Instead, because he has a good understanding of chess programming he can replace the missing parts with code from Fruit 2.1. He will combine the Rocket 3 code and the Fruit code, to create a clone.

He says he will make the source code of this clone public, with a name similar to Rocket 3. He tells me, although it is totally obvious what he does, there are enough people around who will think that Rocket 3 is a Fruit clone, because of that and he will laugh his ass off about the resulting uproar.