Fwd: Re: [Retros] Shortest SPGs ending in mate

[Christoph Fieberg]

> > >     Francois Labelle

> > >     (4.5): 1.d4 e6 2.Bg5 Ba3 3.Nxa3 Qe7 4.Nb5 Qf8 5.Nxc7#

> >

> > SPG in 4,5 moves - Christoph Fieberg - Retro mailing list 4.10.2002

> > 1r1qkb1r/pp1pnppp/2nN4/2p5/8/8/PPPPPPPP/R1BQKBNR b KQk - 0 5

> > 1.Nc3 c5 2.Nd5 Nc6 3.Nxe7 Rb8 4.Nxc8 Nge7 5.Nd6#

>

>The easy-to-miss "rc" means "mating move Requires Capturing". Your SPG in

>4.5 moves doesn't end with a capture.


For subcategory "rc" your knight SPG in 4.5 moves is a new record.


>Similarly, my improvement to "Mate by pawn promoting to queen" was for the

>"wc" subcategory (Without Capturing in the mating move), etc.

>

>Taking into account the two-letter codes, are my claims to record now ok?


However you pawn promoting to queen SGP for "wc" subcategory is not.
Noam Elkies produced the following "wc" already 4.10.2002:
(4.5): 1.e4 d5 2.e5 Qd6 3.exd6 Bf5 4.dxc7 Bg6 5.c8=Q#
See: http://www.pairlist.net/pipermail/retros/2002-October/000312.html


Record table for black pieces mating still needs to be compiled and 
checked. It is likely that your double check findings for black, 
subcategories "wc", "rc" and "mc" are new records.

Best regards,
Christoph