An incredibly nice and instructive case of mutual attacks on connected rim pawns was elaborated by N. Grigoriev in a study published in 1937. White to play wins since he can block the kingside pawns with g4 and thus simultaneously achieve two important goals. He holds the distant opposition and separates his pawns in order to prevent Black from attacking them while they are on the same rank. That is, the critical moment will arise when Black attacks the g-pawn with Kf3 and White defends it with Kf5.
