[Retros] Cornice Chess fun

[Jack Murtagh]

Hi Éric and Marken,

Here's mate in 7.5:

1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8#

On Thu, Oct 29, 2020 at 2:00 PM Éric Angelini <eric.angelini at skynet.be>
wrote:

> 
> 
> Hi Marken,
> 1) is possible in 7.0
> 2) is possible in 9.5
> 3) is possible in 11.0
> 4) is the same as mine
> ... and now for:
> 5) earliest MATE
> 6) earliest DRAW
> 7) earliest MATE by a PAWN (I have 13.5 but
>    it might be bettered)
> 8) earliest MATE by a KING (I have 13.5)
>
> à+
> É.
> Catapulté de mon aPhone
>
>
> Le 29 oct. 2020 à 18:36, Marken Foo <markenfooyw at gmail.com> a écrit :
>
> 
> Hi again Éric,
>
> Not particularly sure on some parts, but I got:
> 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~
> 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0.
> 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~
> 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8
> 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4
> h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6
> 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B
> 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1
>
> Sincerely,
> Marken
>
> On Thu, 29 Oct 2020 at 20:53, Éric Angelini <eric.angelini at skynet.be>
> wrote:
>
>> Hello Retros’ friends,
>> more puzzles from lockdowned Brussels.
>> « Cornice Chess » (CC) allows only movements
>> that end on ranks 1 and 8 or columns a and h
>> (the opening 1. Nc3 is forbidden but not the
>> Sodium Attack 1. Na3)
>>
>> What is the length of the shortest CC game ending in:
>> 1) 0-0
>> 2) NxB
>> 3) BxN
>> 4) BxB
>> Best,
>> É.
>>
>>
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