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I think program size is probably not a good measure since any heuristic you can put in could be discovered at runtime with a metaheuristic that searches for good heuristics. Time and memory make more sense.

Measuring the size of a model that produces a win?

Theoretically valid, but that's not going to be a very useful/diable.

No, but in practice centipawns reported by the imperfect engine are good.

But I want to point out that in theory there is also something more than pure win/ lose/ draw with prefect play.

That is a neat variation.