That did the trick, thank you very kindly! As my recording engineering professor used to say, "you are only one button push away from getting it right!" This time, looks like i was two away - the deep copy, and moving the pop to inside the conditional (inside the for loop). Wish me luck porting this puppy over to C with the pthread.h library (there are no PthreadMonks last time i checked ...)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to (jeffa) 2Re: Trying to solve N-Queens by jeffa
in thread Trying to solve N-Queens by jeffa

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