Martingale with a 50% chance is dicey at best, but with roulette I think it will end badly. There is a whole really long thread in this section discussing the martingale strategy, it is an interesting read (sometimes). You should check it out.
so you don't have any further guesses about this person ,, even if he changed his mind to bet on dice games instead of roulette ?
I see some of that threads but this is another discussion with 20 chance of 50% winning for each
thanks man for your opinion also