[Retros] Vertical mirror with one move less

[andrew buchanan]

Hi Olli,

Congrats on the idea. And yes as you suspected, your proof can be done
more quickly - with the old *horizontal* mirror trick saving another
ply.

rnb1kbnr/pppp1pp1/8/3N1P2/8/8/PPPPP3/R1BQKq1q
PG in 8.0, 2 solutions, 
but if either of the Black queens is replaced by a rook, then there is
only one solution.

Regards,
Andrew.

--- Olli Heimo <olli.heimo at luukku.com> wrote:


> This one with same idea as my morning posting has a

> vertical mirror from the same idea, and one move less.

> 1sbqkQ1Q/1pppp3/8/p7/5p2/3P4/PPPP1PP1/RSB1KBSR

> 

> 17 single moves.	16 + 10

> 

> Solution 1 

> 1.Ph2-h4   Pa7-a5   2.Ph4-h5   Ra8-a6   3.Ph5-h6   Ra6-d6   

> 4.Ph6xg7   Rd6-d3   5.Pe2xd3   Ph7-h5   6.Qd1xh5   Sg8-h6   

> 7.Qh5xh6   Pf7-f5   8.Pg7xh8=Q Pf5-f4   9.Qh6xf8   

> Solution 2 

> 1.Ph2-h4   Pa7-a5   2.Ph4-h5   Ra8-a6   3.Ph5-h6   Ra6-d6   

> 4.Ph6xg7   Rd6-d3   5.Pe2xd3   Ph7-h5   6.Qd1xh5   Sg8-h6   

> 7.Qh5xh6   Pf7-f5   8.Qh6xh8   Pf5-f4   9.Pg7xf8=Q 

> Resolution time : 2.14 s.

> Any shorter?, may be possible. I wish merry Christmas to

> all of You, especially to Per Olin, (whom I know personally

> wery well and to Pastmaker, whom I do not know). Their 

> messages today must be put under consideration over

> the holidays. Olli.

> 

> ...................................................................

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