Looks like he's counting plies rather than moves, and the spike at the 80th ply is caused by the 40-move time control http://www.fide.com/fide/handbook.html?id

Looks like he's counting plies rather than moves, and the spike at the 80th ply is caused by the 40-move time control http://www.fide.com/fide/handbook.html?id=39&view=category http://www.fide.com/fide/handbook.html?id=39&view=category