2.5.3. No Passed Pawns
When in endings of king and two pawns versus king and two pawns neither side has a passed pawn, the positions assume a static character – the main role is assigned to the kings which decide the outcome of the game by complicated manoeuvres. The only exception to this rule is a situation where pawns separated by one file confront connected pawns. When the connected pawns are on the same rank a breakthrough is possible by sacrificing one pawn so as to enable the other pawn to run. In order for this tactical operation to work it is vital that at the moment of the blow the enemy king should be outside the square of the other pawn.