I recently found out that some players use book errors in quotes to bet without risk. Mistakes can be different — from technical to analytical. And if they usually turn a blind eye to the use of the latest beeches, then for online betting on technically erroneous coefficients, they almost always make a refund. Almost — because sometimes you can still get a win. But the abuse of such bets can lead to the closure of the account by the bookmaker. I somehow abused it, and they closed my understanding. It was unfortunate, so you need to put it according to the rules and do everything according to the law.
