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| (41) Posted by Rewan Demontay (Real Name: James Malcom) [Friday, Dec 13, 2019 22:11]; edited by Rewan Demontay (Real Name: James Malcom) [19-12-14] |
For a legal position, here is an improvement of one over Kostas’s 31 There are 16 forced mates per side. It’s a symmetrical position as well with a mutual pin in the middle.
#1, Duplex
 (= 10+10 )
EDIT: The a5 and h5 pawns have been removed.
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| (42) Posted by Kostas Prentos [Saturday, Dec 14, 2019 10:35] |
The mutual pin is an excellent idea. It adds two mates effortlessly. The position works even without the pawns a5 and h4. Good job, James.
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| (43) Posted by Rewan Demontay (Real Name: James Malcom) [Saturday, Dec 14, 2019 15:24] |
Many thanks Kostas. I have now removed the a5 and h5 pawns.
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| (44) Posted by Arno Tungler [Thursday, Dec 19, 2019 09:01] |
Most of the tasks that were mentioned here were addressed decades ago as Hauke already indicated. You can find tons of possible scenarios if you search for k='einz%gerrekord' on the PDB. For example for
Forced Duplex-mates with James' position in 1950: P1178852
The same with promoted force: P1180136
Forced Duplex-stalemates: P0005615
http://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1178852%27OR%20PROBID=%27P1180136%27OR%20PROBID=%27P0005615%27
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| (45) Posted by Rewan Demontay (Real Name: James Malcom) [Thursday, Dec 19, 2019 14:22] |
Thanks Arno. Looks like I was completely anticipated 69 years ago!
Also, for an illegal position, see P1180673 with 48 forced duplex mates.
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