[Retros] A single red unit

[Marken Foo]

Hi Éric,

A difficulty of 1 or 2 sounds right, since it's just playing with 4 out of
32 units...

Sincerely,
Marken

On Sun, 25 Oct 2020, 23:22 Éric Angelini, <eric.angelini at skynet.be> wrote:

> Yep!
> BTW, on a scale 0 to 10 (easy/ not easy)
> how would you judge this?
> (me: 2/10)
> Best,
> É.
> Catapulté de mon aPhone
>
>
> Le 25 oct. 2020 à 16:17, Marken Foo <markenfooyw at gmail.com> a écrit :
>
> 
> 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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