[Retros] Add-on

afretro afretro at yandex.ru
Wed Nov 15 08:50:09 EST 2006

Mate to the black king on b1:
1.Pc2-c3 Pf7-f6 2.Qd1-a4 Ke8-f7 3.Qa4xa7 Kf7-e6
4.Pa2-a4 Ke6-d5 5.Ra1-a2 Kd5-c4 6.Pb2-b3 Kc4xb3
7.Qa7-c5 Kb3xa2 8.Qc5-a3 Ka2xb1 9.Qa3-b2

Thus it has been proven that in a dual-free SPG the black king can be mated on any first-rank square in just 17 single moves.


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