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MatPlus.Net Forum General 8 promoted black queens - correction
 
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(1) Posted by Gady Costeff [Saturday, Nov 18, 2017 00:44]

8 promoted black queens - correction


Mr. Olaf Jenkner cooked my Mat Plus problem.

http://pdb.dieschwalbe.de/search.jsp?expression=probid=%27P1343057%27

The correction is:
G. Costeff after G. Popov
(= 10+12 )
#21

Thank you Olaf for the testing.
Mr. Popov deserves most of the credit, I just added the 8th promotion to his matrix.

Gady
 
(Read Only)pid=16146
(2) Posted by Olaf Jenkner [Saturday, Nov 18, 2017 01:31]

Problem and solution are here:

http://pdb.dieschwalbe.de/search.jsp?expression=probid=%27P1343321%27
 
 
(Read Only)pid=16147
(3) Posted by Joost de Heer [Saturday, Nov 18, 2017 09:00]

It reminds me a bit of what Tim Krabbé called 'The bottomless pit': P1295932 with 9 self-sacrifices on e4.
 
 
(Read Only)pid=16148
(4) Posted by Gady Costeff [Tuesday, Nov 21, 2017 03:17]

Olaf pointed out that in my earlier posting the 8th queen depended on black move order cooperation.
I was unaware of this, and consider it unacceptable when the point of the composition is the 8 queen task.

G. Costeff after G. Popov
(= 11+11 )
#20

In the version above black must promote 8 queens to last 20 moves.
 
 
(Read Only)pid=16155

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MatPlus.Net Forum General 8 promoted black queens - correction