Since I have been playing the Stafford Gambit out of the Petroff Defense often, I wanted to practice the normal Petroff. This is one of my daily games against ChessMaster 10. The player ratings are from CM10. One of the reasons that CM10 makes a good opponent is that, like players in OTB competition, it does not stay in book for more that a few moves. But it also does not fall easily into the opening traps of my gambit lines like human opponents.
Lesson Learned: Sometimes the mainlines need to be played to keep the effectiveness of the gambit lines.