So far accurate is 100%, in football everything is possible so he cant guarantee you to win, lost will happen when you don't expect so you just double your bet in next game to cover the lost.
this tips help me have never losed 4 consecutive bets.
i just want to warn people don't bet much money one time.
it looks like you make money from BTC.
if you want to buy BTC at 550 and sell higher to make profit.
you need to divide you money to some parts.
if BTC price down you till have money to buy.it is the thing i want to tell