Pstat ("player statistics") shows the record of wins, losses, and
draws between two players in rated play. If you only supply a
single player, it will show your record against that opponent.
Statistics are broken down by the side you played and by rating
category.
There is also a pstat variable. When turned on ("set pstat 1"), pstat
will automatically be issued when you start a game to display your score
against your opponent.