(2) Posted by James Malcom [Friday, Jun 25, 2021 14:17]
Well, we can always start with the condition "OnlymysolutioniscorrectandvaliditistheonlyoneyouareallandalwayswrongbecauseIsaidsoandImalwaysrightscrewyou" for uniqueness.
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(3) Posted by Joost de Heer [Friday, Jun 25, 2021 16:18]
That fairy condition already exists: Looking glass chess.