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MatPlus.Net Forum General The Bicolor Valladao-Belen
 
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(1) Posted by Rewan Demontay (Real Name: James Malcom) [Monday, Jun 8, 2020 04:09]; edited by Rewan Demontay (Real Name: James Malcom) [20-06-09]

The Bicolor Valladao-Belen


The Valladao-Belen has been achieved for White in all its glory, but Black is yet to play a role. I thus present a bicolor Valladao-Belen.

#7
(= 13+12 )

Sol: 1. Nxc3+ Kc2 2. exd5 hxg1=Q,R 3. Rxg1 axb6 4. g4 fxg3 5. Rxg3 Bg4 6. Rxg4 Kd3 7. 0-0-0#

However, there are two problems-the White king is in check and there is an promoted White queen on the board. The Black promotion promotion dual to a queen or rook makes it impure, but I think that it is sufficient. The en passant part is fully justified. The many captures are unwanted of course, but they are sometimes needed.

Who can improve?
 
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(2) Posted by Rewan Demontay (Real Name: James Malcom) [Tuesday, Sep 22, 2020 06:11]

At last it is improved. The bicolor Valladao-Belen is now in an acceptable form!

#7
Dedicated To Zalmen Kornin & Peter Hoffmann

(= 14+9 )


1. Nc3+! Kc2 2. exd4 hxg1=Q/R+ 3. Rxg1 Bxh5 4. g4 fxg3ep 5. Rxg3 Bg4 6. Rxg4 Kd3 7. 0-0-0#

EDIT: Thanks to a suggestion by Andrew Buchanan, there is now one less promotion "dual" by Black. I've also managed to remove the dual after 6... Bxg6.

The White king is no longer in check and there is no promoted queen. Furthermore, Black's self-trapping of the bishop is genuinely the only defense. The means by which this is done is a bit crude, yes, but it is orthodox nonetheless.
 
 
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(3) Posted by Zalmen Kornin [Saturday, Sep 26, 2020 01:43]

Thank You for the dedication, very kind of You!
 
 
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MatPlus.Net Forum General The Bicolor Valladao-Belen