Can you dig up a problem according to my comment?
(White draws by avoiding mate in x, since retro proves 50-x moves w/o c/p already were done.)
PDB (stip='=' and g='retro') gave too many hits, adding soltext='50' none.
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(2) Posted by Joaquim Crusats [Thursday, Jul 18, 2024 11:58]
"Swimming to die on the shore", implicit in all best defenses.
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(3) Posted by Joost de Heer [Monday, Jul 22, 2024 08:27]
IMO this is a different way of asking 'Mate in how many moves?' with reversed colours.