Vlad latest engine Mod5Ua. Note this engine has failed to load for me. This maybe an isolated case only. Core I7 980x Cpu wiith Fritz 8 interface. Also failed to load inside Aquarium 2010. More information Aquarium doesnt recognize this engine as a UCI engine. Auto detect seems to think it is winboard engine but fails to run. Forcing it to run as a UCI fails also. Also running the engine with out an interface just by double clicking on it crashes instantly. The earlier mod5 runs just fine even without an interface. But other users have used it just fine. If it in fact fails to load for you use the earlier version mod5 as this engine had no problems loading up.