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Oh that's my bad for mixing up terminology. In my mind that whole class of algorithms (CP/MIP/LP/SAT-solving(?)/etc.) fall under constraint programming, because it's programming for a Constraint Optimization Problem.
Excellent post!
As I read it (and please correct me if I'm wrong) this is only applicable to tournaments with only a single format. That is, players are not bound to a particular "slot". This is applicable to some world cups but not all, and indeed the upcoming WCoP will have different tiers...
Won in 3 ggs
https://replay.pokemonshowdown.com/gen9doublesou-2094509414
https://replay.pokemonshowdown.com/gen9doublesou-2094512894
https://replay.pokemonshowdown.com/gen9doublesou-2094517524