R-111A

  When the backward pawn is still on fifth rank and white king is very close, for the assessment of the position is crucial if the kings are on the same side of the pawns. Next diagram show typical position. Black to move draws because he can transfer his king to the opposite side of […]

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R-110

  With white king only one step closer to the pawns than in previous example, Black cannot win in described way since White is quicker with the attack on backward pawn. Nevertheless, Black can realize his advantage if he can escape form checks not allowing rook’s transfer to first rank. S. Tarrasch showed such position […]

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R-109

  If in similar position White’s king is too far away, Black can avoid perpetual by zigzag movement towards the rook, allow switching to first rank defense and achieve winning position by bringing the king back. Such position is shown in S. Tarrasch study from 1911.  

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