In similar positions with a pawn on the seventh rank, the task of the weaker side is much more difficult since the bishop lacks the necessary five squares on the shorter defensive diagonal, so it cannot alone prevent the promotion of the pawn into the queen. If the black king is too far away – somewhere on the first rank or a2 and cannot aid the bishop, the king and the knight will be able to push back the bishop enabling the subsequent promotion of the pawn. Let us first consider the position with the king on c1 examined by Y. Averbakh in a study published in 1958.
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