[Retros] Cornice Chess fun
Norbert Geissler
norbert.geissler at ng37.de
Sun Nov 1 07:03:46 EST 2020
Hmm, something went wrong with my first reply 2 days ago,
so another try:
Hi *,
well, it's fun to see this competition grow ...
The good old condition "double edge mover"
used for finding shortest games ...
One improvement:
mate in 7:
1.a4 h5 2.a5 Th6 3.a6 Txa6 4.Sh3 Txa1 5.Sa3 Txc1 6.Sb1 Txb1
7.Dc1 Txc1 #
And another stipulation to find:
- find a shortest game with "double edge mover" condition ending in a
double stalemate,
ie. after the last move, both sides are stalemate.
Have fun,
Norbert
On 30.10.20 08:22, Marken Foo wrote:
> Hello again,
>
> I improved the stalemate to 7.0:
> 1.a4 h5 2.a5 Rh6 3.a6 Rxa6 4.Sa3 Rxa3 5.Ra2! Rh3 6.gxh3 h4 7.Ra6 Sxa6=
> Unfortunately the last 2.0 moves are not unique.
>
> Marken
>
> On Fri, 30 Oct 2020 at 13:52, Éric Angelini <eric.angelini at skynet.be
> <mailto:eric.angelini at skynet.be>> wrote:
>
> Hello Marken,
> Mario Richter tells me CC is a rediscovery
> of the Edge-mover fairy condition:
>
> https://bit.ly/3mEX9vf <https://bit.ly/3mEX9vf>
>
> He is currently computer-checking a few
> minimal lengths — I will study your claims
> later today. Many thanks for yr post!
> Best,
> É.
>
>
>> Le 30 oct. 2020 à 06:46, Marken Foo <markenfooyw at gmail.com
>> <mailto:markenfooyw at gmail.com>> a écrit :
>>
>>
>> Hello again,
>>
>> 3) BxN in 11.0: 1.a4 ~ 2.Ra3 ~ 3.Rh3 ~ 4.Rxh7 Rxh7 5.h4 Rh8 6.h5 ~
>> 7.h6 ~ 8.h7 ~ 9.Rh6 gxh6 10.hxg8S ~ 11.S*h6 Bxh6
>> 6) Stalemate in 7.5: 1.a4 h5 2.a5 h4 3.a6 Rh5 4.Ra4 Sh6 5.Rxh4 Ra5
>> 6.Rxh6 Rh5 7.Rxh5 bxa6 8.Ra5=
>> Earliest draw is technically 3-fold repetition (draw when white
>> writes their 5th move - not black's 4th) or 5-fold repetition.
>> 7) Mate by a pawn (if promotion counts) in 11.0: 1.h4 a5 2.h5 Ra6
>> 3.h6 Rxh6 4. ~ Rxh1 5. ~ Rxg1 6. ~ Rxf1+ 7. Kxf1 h5 8. ~ h4 9. ~
>> h3 10. ~h2 11. ~ h1Q#
>> 8) Mate by a king in 13.0: 1.a4 a5 2.Ra3 Ra7 3.Rh3 Ra6 4.Rxh7 Rh6
>> 5.Rxh8 Rxh2 6.Rxg8 Rxh1 7.Rxf8+ Kxf8 8.Sa3 Rxg1 9.Sb1 Rxf1+
>> 10.Kxf1 Kg8 11.Kg1 Kh7 12.Kh2 Qh8 13.Qg1 Kg8#
>>
>> Marken
>>
>>
>> On Fri, 30 Oct 2020 at 03:21, Éric Angelini
>> <eric.angelini at skynet.be <mailto:eric.angelini at skynet.be>> wrote:
>>
>> Yep!
>>
>> à+
>> É.
>> Catapulté de mon aPhone
>>
>>
>>> Le 29 oct. 2020 à 19:55, Jack Murtagh <murtagh.jack at gmail.com
>>> <mailto:murtagh.jack at gmail.com>> a écrit :
>>>
>>>
>>> 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 <mailto: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 <mailto: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
>>>> <mailto: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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--
...for chess, that superb, cold, infinitely satisfying anodyne to life,
I feel the ardour of a lover, the humility of a disciple.
(Herbert Russell Wakefield)
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