An even more complicated case of fighting the breakthrough is shown in a study by N. Grigoriev published in 1930. The white g-pawn has paralyzed both enemy pawns; White would win easily by advancing the distant a- passed pawn if Black did not threaten a breakthrough involving the sacrifice of the f-pawn. Since then the freed g-pawn would be as quick as the white passed pawns, Black would be very close to drawing. Yet, White wins since he can drive the enemy king to an unfavourable square by a series of complicated manoeuvres enabling him to execute a winning attack following the queening of the pawn.
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