stalemate) on move 65. In the position from a game between Wolfgang Unzicker and Erik Lundin, White to move wins, however 48. f3+! is the only winning move. If the black pawn were still on f7, the black king could go back to f6 or g7 and the position would be a draw. (If 48.a7? Ra2+ and 49...Kf3 draws.) New analysis The reason this type of position was long thought to be an easy draw is as follows: White cannot advance his pawn to the seventh , because that would deprive his king of any shelter. So White must advance his pawn only up to the sixth, so the king can find shelter on a7. White's only real winning attempt was to move his king up to a7. Then he can play Rb8–b6, Kb7, a7 (threatening Ra6), forcing Black to give up his rook for the pawn. But while White is spending all this time, Black's rook can win White's kingside pawns, then advance the newly made passed pawns. It has been known for White to even lose this battle of rook versus many passed pawns. Thus if White tries too hard to win, he may actually lose. Recent theoretical analysis of this position shows that White has a strong maneuver: Advance the pawn to the sixth . Move the king towards the . When the black rook takes a kingside pawn, switch the rook to guarding the pawn from the c-file, i.e. Rc7 then advance the pawn to a7. Switch the white rook to the a-file with gain of tempo. Thus Black is forced to sacrifice his rook for the pawn without White having to move his king all the way to a7. These many extra tempos make the difference between winning and drawing or even losing. Black must play very carefully to draw, rather than the very easy draw that was long thought to be the case. Kantorovich analyzed the position in the diagram on the right and thought that Black draws with two tempi to spare. In 2003 Steckner found an improvement for White that wins. Black's pieces are in their optimum positions: the rook is behind the a-pawn and attacking the f-pawn and the king is in its most active location. If 1.Ra8 Kf5 Black has an easy draw; however, White has a better plan which wins with precise play: 1. Kd4! The f-pawn must be