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Am I missing something? In 4th round during the production of yellow cubes, red player places 5 white cubes on finishes building a card. He has 0 red cubes at that moment.

#405429814

From move 100

I don't think it would have changed the outcome even if the card wasn't built. Just confused

the card with 5 white cubes needed is discarded, not built. Nothing to see.