From Fine's BCE:

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I can only see the pawn getting to a2 after 1.d6+ Kd8 2.e6 a4 3.Kf6 a3 4.e7+ Ke8 5.Ke6 a2 6.d7#. That's three pawn moves, not four.

What is the more resistant defence I missed?

  • Look at 1.d6+ Kd7 – Ywapom Apr 30 '19 at 17:34
  • @Ywapom 1.d6+ Kd7 2.Ke4 a4 3.Kd5 a3 4.e6+ Kd8 5.e7+ Kd7! and if instead 5.d7 Ke7! 6.Kc6 a2 = – Jossie Calderon May 1 '19 at 0:38
  • 4
    Ke4??? WTF? Kf6! – Brian Towers May 1 '19 at 13:14
  • 1
    Maybe you should rephrase the question to "in what line does Black manage to get in four pawn moves?" – Ywapom May 1 '19 at 16:55

1.d6+ Ke8

2.e6 a4 (pawn move 1)

3.Kf6 a3 (pawn move 2) [Note: 3.e7 Kf7!]

4.e7 a2 (pawn move 3)

5.Ke6 a1=Q (pawn move 4)

6.d7 mate

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