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

[Nicolas.Dupont at math.univ-lille1.fr]

Dear Andrew and all,


> Very

> possible that faster versions still yet exist, especially the N one...



> Nnb3n1/1pkpQp1r/p1p5/8/8/8/P1P1PPPP/RNB1KBNR

> SPG 9.5


You're right, as shown below :

1.Pc2-c3   Pb7-b5   2.Dd1-a4   Pb5-b4   3.Da4xa7   Pb4-b3
4.Da7-e3   Ta8-a5   5.Pa2-a4   Fc8-a6   6.Ta1-a2   Pb3xa2
7.Re1-d1   Fa6xe2   8.Rd1-c2   Pa2-a1=C

The goal of my previous mails was only to indicate some solutions where
Hiro's list was empty. Of course, the main point is now to find the
shorter one in each category. I think that the above 8.0 is difficult to
beat...

Nicolas.