Re: 20/40 top set
I vote for a check.
Your huge turn bet looks like a bluff and checking would be feigning giving up on the river. Villian can really only call that turn bet with 2 pair or a set (maybe AQ i really doubt it though). I think by pushing you are giving 2 pair a chance to fold but if you check it will certainly value bet. Obviously if villain holds a set the money is going in either way, but I think a push on the end scares off some 2 pair hands.
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