No, the thing is Matthew made it clear that the bet was about if Pirate would pay as stated in his thread, and Pirate states that he will send back the funds with full interests.
My bet is made under those two statements. I have no problem honoring it if Pirate pays in full with interest.
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Then you should have read Matt's rules before betting with Matt in Matt's thread. Too late now, you're in.
What about it being too late? That's what Matt's rules are. That he lose if Pirate doesn't pay as described in his thread. What does pirate's thread say? That he'll pay back the coins with extra interest.
If people agree to a partial payout, people have not been paid as described in Pirate's thread.