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It's inappropriate to make fun of someone for mentioning chess and coin flips. The question is perfectly normal.
In reality, Sir Davos answered the question very clearly.
If 2 players decide to determine the winner of their match in a way that differs from the regulations, then that's their prerogative, but if any disputes arise, there will be no one to judge, and if the participants cannot agree, both will be awarded 0-0.