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MatPlus.Net Forum General Onemovers?
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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
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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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MatPlus.Net Forum General Onemovers?