The weaker side’s prospects of drawing are also good when the enemy king is far away from own pawns. As a sole knight cannot prevent infiltration of the enemy king amidst his pawns, the weaker side succeeds in drawing by sacrificing the knight for the pawns unless they are too far advanced. A typical case which demonstrates the helplessness of the sole knight when defending the connected pawns, arose in the game Najdorf – O’Kelly, Barcelona, 1946. Although the pawns have set up an impenetrable “hedge-hog” barrier to keep at bay the enemy king, Black to play draws. His plan is to provoke the advance of one of the pawns so as to create an entry route for the king and later eliminate both pawns by the knight sacrifice. The phase one consists in creating a gap in the opponent’s pawn structure!