David,


The bet should stand.


My reasoning has to do with sports betting. What would happen if a star basketball player that was responsible for making the most scores for the team gets injured during the first few minutes of the game and they have to take him to the hospital. Let's say the team before the game was a 2-to-1 favorite, but now they are a 3-to-1 dog. Do all the sports books let there customers cancel their bets?


That's why they call it gambling.


Furthermore, it is very common for casinos to make a guarantee to promote the event. I don't think the circumstances are unusual, so I think the under bettor used bad judgement and is trying to weasel out.


Good Luck


Mark