[Retros] record lists

[François Labelle]

Hi Olli,

In August 2017, I computed every checkmate proof game in 6.5 moves. 
There are 9 checkmate proof games in 6.5 moves with an ep-capture 
somewhere in the solution, and no such checkmate proof game in 6.0 moves 
or less. The ep-capture can be on move 5, 6 or 7. Kauko's proof game is 
the second one on the list.

1.b4 e6 2.Ba3 Ke7 3.Qc1 Kd6 4.b5+ c5 5.bxc6 e.p.+ Kd5 6.Nc3+ Kc4 7.e3#

1.d4 e6 2.d5 Ba3 3.Qd4 Ke7 4.Bd2 Kd6 5.Bb4+ c5 6.dxc6 e.p.++ Kxc6 7.Qc5#
1.d4 e5 2.d5 Ba3 3.Qd4 Ke7 4.Bd2 Kd6 5.Bb4+ c5 6.dxc6 e.p.++ Kxc6 7.Qc5#
1.d4 e5 2.d5 Ba3 3.bxa3 Ke7 4.a4 Kd6 5.Ba3+ c5 6.dxc6 e.p.++ Kxc6 7.Qd6#
1.d4 e6 2.d5 Ba3 3.bxa3 Ke7 4.a4 Kd6 5.Ba3+ c5 6.dxc6 e.p.++ Kxc6 7.Qd6#

1.d4 e5 2.dxe5 Bd6 3.Qxd6 Nc6 4.Qg6 d6 5.g3 Kd7 6.Bh3+ f5 7.exf6 e.p.#
1.d4 c5 2.dxc5 e5 3.Qd6 Qf6 4.Qc7 Ke7 5.e4 Ke6 6.Bc4+ d5 7.cxd6 e.p.#
1.d4 e5 2.dxe5 d6 3.Qxd6 Nf6 4.Qb6 Kd7 5.g3 Ne8 6.Bh3+ f5 7.exf6 e.p.#
1.d4 e5 2.dxe5 d6 3.Qxd6 Nf6 4.Qa6 Kd7 5.g3 Ne8 6.Bh3+ f5 7.exf6 e.p.#

My files almost certainly contain some new records, but to know which 
records were beaten we first need an up-to-date record list which would 
take a lot of work.

     François

On 2018-11-20 12:25 p.m., Olli Heimo wrote:
> The existing record lists are very difficult to examine. In 1990's we tried to find shortest SPG's ending in mate with different premises. One was mate with ep-capture. Now I can't be sure what ia the record, but at that time Finnish composer Kauko Väisänen made the following: 1.d4 e6 2.d5 Ba3 3.Qd4 Ke7 4.Bd2 Kd6 5.Bb4+ c5 6.dxc6 ep+ Kxc6 7.Qc5#. Surprisingly the ep-capture, which must be a check is not mate in this problem. Sad news told that Kauko died in March this year. Olli.
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