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P-58

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If the white distant passed pawn were shifted one rank back, a very different position would arise! White wins since after eliminating the black distant passed pawn Black’s king will not be able to control the key-square b7 in time.

 

For all similar positions a universal rule holds:
White always wins provided his distant passed pawn has not crossed the black pawn's diagonal line of “refraction” from the c-file. In other words, in case of the blockaded pawns a3-a4, White can win only if the distant pawn has not crossed the g2-d5 diagonal ( rook's pawn always draws! ) .
If the blockaded pawns are a2-a3, White wins only if his distant passed pawn has not crossed the f2-d4 diagonal; whereas positions involving g- and h-pawns are always drawn.
The rule of the thumb is: a distant passed pawn is all the more valuable the nearer the second pawn is to its promotion square!

 

Again, the diagonal line goes from the black pawn's square and is refracted on the c-file. In this position, white passed pawn didn't cross the line and White can win.

 



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