[Retros] Pawn to-the-8th-rank mates

[Hirokaz ONODA]

Hi Andrew,


> rnbk1Qnr/ppqpp2p/2p2p2/8/8/8/PPPPP1PP/RNBQKBNR

> 1.f4 c6 2.f5 Qc7 3.f6 Kd8 4.fxg7 f6 5.gxf8Q#


In this case, promotion to Rook is sufficient to mate.
So it is not included in "Queening is MUST(underpromotion
is insufficient)"

Amici Sumus,
Hiro


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