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you are not 1800 , you are about 800-1000 so i bet youll lose the bet
how much are you betting that he will lose the bet?
100$ would be a pretty good motivator if you are 12 years old!
Agreed. Also, if one of them gets a mentor, then he'd have little choice unless he drops the mentor. The other one supposedly enjoys chess even more. A final motivator would be the challenge itself, when not only $100 is on the line (which is a big deal for kids and probably many adults), but also ego/pride.