What's the difference between SCID and SCID vs PC? I've got two files installed on my site from SCID &amp; SCID vs PC - Scid vs PC-4.16.x64 &amp; Scid-4.6.2. How are they different ? Or are they just the same ? Which one should I delete if it is a replica?
Thanks!
Shane's Chess Information Database (SCID) is a powerful Chess Toolkit, with which one can create huge databases, run chess engines, and play casual games against the computer or online with the Free Internet Chess Server. It was originally written by Shane Hudson , and has received strong contribution from Pascal Georges and others.
  
  Scid vs. PC began with bug-fixes for the computer-versus-player features of Scid (hence the name), but has evolved into a solid alternative with many new features and interfaces. The project is authored by Stevenaaus and numerous contributors. 


So they are not the same. Scid vs. PC is a SCID variant.