Betting in chess sound as a nice way to gamble, the problem is people could use a computer in the hard level to play chess against other people, that way the gamewill be rigged and the winner will be the one with a smarter PC.
So, if you find a place to bet on chess, i would like to recommend you to not place a bet.
I would play with some friends online...so it is not very likely they will scam me (so easy) but you never know

Ok, if that's the scenario then you can use a service called lichess. On this link you can start a game with the time indications you want:
https://lichess.org/?any#hookAnd after generating the match you will get a link to share with the user yo want to play, Since you want to bet with trusted friends, then you only need to make the bitcoin transaction after each game
