In the current Anand - Carlsen world championship match, Carlsen has just won the 5th game when Anand had to resign on the 58th move in a lost rook ending.
Carlsen had a very slight edge out of the opening but the plan of 23. Rhf1 and 24. Rf4 did not seem enough to pressure black. Anand attributed his loss to 34....Rd4 which to me seems a perfectly good move but then again I am not the world champ! The champion's last chance to hold seems to be on the 45th move when instead of 45...Rc1+ he should have played 45...Ra1 and pick up the white a-pawn.