[Retros] No occupied white square

[Francois Labelle]

On 12/31/2013 08:41 AM, Olli Heimo wrote:

> Unto Heinonen wants this to be published on the mailing list as a New Years Greeting: r1b1k1n1/1p1p1p1R/r1p5/3p3p/P7/3K1N1P/q1P1P1P1/1N1Q1B1R (12+12). Proofgame in 13.0 moves. This is because he informed me that he has now a sound proof game in 15,5 moves leaving 25 men on same-coloured squares and he is working with 26 men. Happy New Year, Olli.


Let me publish my record for 23 units then:
1n1k1b1r/2p1p1p1/5n1p/8/3q1Q2/N1P1P1P1/1P1P1P1P/R1B1K1N1 (13+10)
Proof game in 10.5 moves.

There's a variation with 22 units by removing Qf4.


On 12/20/2013 04:56 PM, Kevin Begley wrote:

> I presume that this "record" must be defined for n-units (from 2 to 

> 32), in the shortest number of moves.  You could further divide this 

> into two square-colors.

>

> The point is, he should probably publish, regardless (unless somebody 

> achieves n (or more) units on the same color, in fewer moves).


Here are the records so far:

20 units: 10.0 moves (François, variation of problem with 21 units)
21 units: 10.0 moves (François, to be published)
22 units: 10.5 moves (François, variation of problem with 23 units)
23 units: 10.5 moves (François, Retros mailing list)
24 units: 13.0 moves (Unto, Retros mailing list)
25 units: 15.5 moves (Unto, to be published)

Happy new year everyone!

     François