[Retros] A single red unit

[Marken Foo]

Hello all,

It seems like a promoted unit has to be interpreted as a "fresh" non-red
unit, so I have 13.0 moves:
1. a4 a5 2. Ra3 Ra6 3. Rb3 Rc6 4. Rb5 Rc4 5. Rxa5 Rb4
6. Rb5 Rc4 7. a5 Rb4 8. a6 Rc4 9. a7 Rb4
10. a8=R Rc4 11. Ra1 Rb4 12. Rba5 Ra4 13. Ra8 Rxa8

Sincerely,
Marken


On Sun, 25 Oct 2020 at 19:05, Éric Angelini <eric.angelini at skynet.be> wrote:

> Hello Retro fans,
>
> rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR
>
> Say a « red » unit is a chess unit that moved more than once during the
> game.
>
> What is the minimum number of moves needed to reach the above FEN diagram
> where only one of the 30 units is red?
>
> Best,
> É.
>
>
>
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