[Retros] Shanah Tovah!

[andrew buchanan]

Hi Nicolas,
 OSPG means "one-sided proof game". No Black pieces at all to interfere with the solitaire. In this case, it should be possible to find a regular series proof game, where the Black army just sits there. Maybe:https://www.janko.at/Retros/d.php?ff=rnbqkbnr/ppppppPp/8/R7/PQPP3P/1P2PR2/B4P2/B3KNN1
Not so long now until the end of the Western year... care to try your hand for 2,021? :-)

CheersAndrew

    On Saturday, September 19, 2020, 9:54:35 PM GMT+8, Nicolas Dupont <nicolas.dupont at univ-lille.fr> wrote:  
 What is the meaning of OSPG ? Black pieces are masked ?De: "andrew buchanan" <andrew at anselan.com>
À: "The Retrograde Analysis Mailing List" <retros at janko.at>
Envoyé: Samedi 19 Septembre 2020 04:52:15
Objet: Re: [Retros] Shanah Tovah!

 As sweet as apples dipped in honey! I will view the remarkable subtraction as a good omen for the year to come. This seems rock solid to me, but is there a way in Jacobi to test proof games with no black units?

    On Saturday, September 19, 2020, 9:40:24 AM GMT+8, Elkies, Noam <elkies at math.harvard.edu> wrote:  
 
 Hope I did this right (OSPG 24, how many solutions?)

https://www.janko.at/Retros/d.php?ff=7B/R5P1/1Q6/8/P1PPR2P/1P2PN2/B4P2/4K1N1

NDE
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