PIO solver and CREV Posted by newbie123 Posted by newbie123 posted in Mid Stakes Posted 3 years, 4 months ago PIO solver and CREV Hey guys im very new to GTO.whats the difference between these two programs? is it necessary to buy both? im hearing a lot about PIO solver Loading 2 Comments... Be the first to add a comment You must upgrade your account to leave a comment. This thread has been locked. No further comments can be added.