[Retros] recent improvements

[Joost de Heer]

Mario Richter schreef:

> Joost wrote:

>>>     1 Pe7xd8=N

>> I find this hard to believe. Francois Labelle (using my computer) did an 

>> exhaustive search for all 11-ply games to see if there were any games 

>> determined by the last move, and the only one found was Peter Roessler's 

>> 6. g7xf8=N#

> 

> The line above only says that there is only one *correct* (i.e. single-

> solution) SPG in 11 plies which ends with Pe7xd8=N#.

> 

> There are other games in 11 plies ending with Pe7xd8=N#, e.g.

> 1.a4 b6 2.e4 d6 3.e5 Ke8-d7 4.exd6 Kd7-c6 5.dxe7 Kc6-b7 6.exd8=N#,

> but they do not constitute are correct SPG ...


OK. My apologies for misinterpreting your results.

Joost