Quote from walterjennings:
its easy with forex. flip a coin. you have a 50% chance of doubling your money in a day. given a 0.070$ move from open value. at 200x leverage. IB must have rules about that. i would have just created two contest accounts. make one buy. the other sell. and finish the first day with 200,000$ in my account.
No, that's 100% false. Impossible to pull off at IB. Even ignoring for the moment any multiple-registration contest rules they must have in force. You could always collude, I mean, collaborate with a partner, agreeing to share any prize money, although, sadly, not bragging rights or an offer of employment in the suburban paradise that is Greenwich.
First, maximum forex leverage at IB is set at 50:1, not 200:1. With $100K in play money, the most you could trade would be about 3.8M EUR/USD, 2.5M GBP/USD, etc.
Second, a "0.070$" daily move has not happened in any of the majors or more common crosses in this decade.
The average daily range across the majors has recently been between 50-140 pips, depending on the pair. In % terms, that works out to a much narrower range of about 0.55-0.75%. Even if you manage to enter both long and short at what will turn out to be an extreme of the day (high or low) -- and that's a pretty big "if" right there -- you may expect to gain no more than 30-35% in the winning account, while losing 50% on a margin call in the losing account. You could hope for a blockbuster day, which happens a few times a month, but any gain in the winning account will still fall far short of "doubling your money" in a day.
However, there's a catch (surprise...), and it's another biggie. Unless you happen to nail your entry point within a few pips of the extreme, you'll have a high probability of getting a margin call in
both accounts within the first hour or two. The resulting 50% losses in each account will probably put an end to your noble quest for victory, before you ever get a shot. That is so unfair.
The only practical solution is to reduce your working leverage well below the limit of 50:1. That would create some breathing space, but also further cap any potential gains in the winning account, to the 20-25% range. And that's just day 1. What happens to the winning account on day 2, day 3 and so on?