Francesco Santelli has found an exception on the Bahr rule with this position:

The Bahr rule (is named after the inventor: Bahr, Walter 1905-1986) is about calculating a pawn ending where there are two blocked rook pawns and one extra outside passed pawn.


Condition 1 

The stronger side 'rook-pawn' has not crossed half of the board. (Not crossed its 4th rank),

if the rook-pawn has crossed middle of the board the stronger side will win, otherwise we have to use Bahr's rule.

Condition 2

The stronger side king stands next to its passed pawn.

Condition 3

The defender king must be standing in front of the passed pawn or in front of the attacking king.


(See examples and explanations of this rule at:


So back to the above position with variations given by Francesco Santelli.

(You may also try this at Nalimov's tables here:


The Black King, keeping an eye on the square rule of the free Pawn, does not allow the White K to cross the 2nd rank until the free Pawn is definitively pushed.




If Black has to move, white wins with the John Crum manoeuvre :