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

[andrew buchanan]

And here are speedier versions of the a1/8 N & B promotions. Very
possible that faster versions still yet exist, especially the N one...

Bn1q1bnr/2p1pppp/ppkp4/5Q2/8/3P4/P2KPPPP/RNB2BNR
SPG 8.5

Nnb3n1/1pkpQp1r/p1p5/8/8/8/P1P1PPPP/RNB1KBNR
SPG 9.5

Cheers,
Andrew.

--- andrew buchanan <andrew at anselan.com> wrote:


> Well the a1R# can be done by:

> 

> rnb1kbnr/p2ppppp/1p6/q5Q1/3P4/8/1PPBPPPP/r1KR1BNR

> SPG 7.0

> 

> Similarly a1Q#. (i *did* try to go as fast as possible, lol)>

> 

> Andrew.

> 

> --- Nicolas.Dupont at math.univ-lille1.fr wrote:

> 

> > Vacancies on a1 (I didn't try to go as fast as possible).

> > 

> > > (1-1) promoted to Knight

> > >

> > > a1N# (vacant)

> > 

> > 1.Pa2-a4   Pd7-d5   2.Pa4-a5   Pd5-d4   3.Pa5-a6   Dd8-d5

> > 4.Pa6xb7   Pa7-a5   5.Ta1-a3   Pa5-a4   6.Ta3-f3   Pa4-a3

> > 7.Pc2-c4   Pa3-a2   8.Pc4-c5   Ta8-a3   9.Pc5-c6   Ta3-e3

> > 10.Pd2-d3   Cb8-a6   11.Re1-d2   Dd5-a5   12.Rd2-c2   Pa2-a1=C

> > 

> > > (1-2) promoted to Bishop

> > >

> > > a1B# (vacant)

> > 

> > 1.Pa2-a4   Pe7-e6   2.Pa4-a5   Dd8-h4   3.Pa5-a6   Ff8-e7

> > 4.Pa6xb7   Pa7-a5   5.Ta1-a3   Pa5-a4   6.Ta3-f3   Pa4-a3

> > 7.Pb2-b4   Pa3-a2   8.Pb4-b5   Ta8-a3   9.Pb5-b6   Ta3-e3

> > 10.Pd2-d3   Dh4-a4   11.Re1-d2   Fe7-h4   12.Rd2-c3   Cg8-f6

> > 13.Fc1-d2   Pa2-a1=F

> > 

> > > (1-3) promoted to Rook

> > >

> > > a1R# (vacant)

> > 

> > 1.Pa2-a4   Cg8-f6   2.Pa4-a5   Cf6-e4   3.Pa5-a6   Ce4xd2

> > 4.Pa6xb7   Cd2xb1   5.Fc1-f4   Pa7-a5   6.Pe2-e3   Pa5-a4

> > 7.Dd1-h5   Pa4-a3   8.Pg2-g4   Pa3-a2   9.Ff1-g2   Cb1-a3

> > 10.O-O-O    Ta8-a4   11.Td1-d2   Pa2-a1=T

> > 

> > > (1-4) promoted to Queen

> > >

> > > a1Q# (vacant)

> > 

> > Same game except 11... a1=D.

> > 

> > 

> > 

> > 

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> > 

> 

>