[Retros] Pawn to-the-8th, single checkmates, simplified ed.

Mario Richter mri_two at t-online.de
Fri Dec 15 00:37:38 EST 2006

> (1-1) promoted to Knight


> 1.d4 c5 2.dxc5 d5 3.Qd4 Be6 4.Qf6 d4 5.Kd2 d3 6.Kc3 d2

> 7.b4 d1N# (Olli Heimo & Gianni Donati 1996)

This can be done faster:

SPG 6.0

(rnb1kbnr/pp1ppppp/8/q7/3P4/1P6/PKP1PPPP/RNBn1BNR SPG 6.0
works too, but I like the first more).

Same idea for Pe2-e1=N#

SPG 6.0

> (1-4') Queening is MUST(underpromotion is insufficient)

Has somebody encountered the opposite situation:

Underpromotion is MUST, while queening leads to
a non-unique PG?



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