For pursuing wagering contests i suggest to you just stick to the normal bets such as 2x payout and do not use martingale strategy because it will dried your balance rapidly and the worst thing if you use that method for the contests is you will run out your money but at the end of contests you cannot reach good position to get prizes
Agree,,, but this depends on your balance. To build a wager for first few levels, I would say at least 0,05 BTC is necessary to last 1 million bets at x2 payout on starting bet 1 satoshi, but if you have much much less, I would even go for just small bets like 100 satoshi at max chance, and then no increase on loss.
OR my personal favorite is to x2 martingale till maybe 1000 profit, then use 100 on max chance until bust. Repeat again and again.
Martingale or any other strategy is at the end all depends on the luck of the player. I once had a streak of 11 wins, considering it was martingale my win wasn't as considerable as it could be yet when I had 7 in a row loss (less than 11 streak) I lost all my money. So, at the end as you can see martingale has a very slim margin of unlucky streaks, if you end up at the red too many times in a row then you may end up with nothing and winning the contest wouldn't help you recover 10% of that most of the time.
So, I still think betting small on high odds of winning is a better strategy because even if you lose you lose small amount and there is a chance of hitting 100 in a row wins (even if you lose once or twice its small amount) and that ends up with high wagered amount.