Editorial comment  I think Of course this is not literally true He was making a semiserious comment on the fact that a small advantage in a rook and pawn endgame is less likely to be converted into a win seems unencyclopedic and WPOR I think it should be rewritten as  The context of this quote shows it is a comment on the fact that a small advantage in a rook and pawn endgame is less likely to be converted into a win