Yes, I was about to say the same thing. The obvious strategy is to find the pair with the highest bid-ask spread in real terms, and then apply the maximum available leverage.
The contest says a maximum of 4 orders per day (2 complete trades), so this is not a trivially easy way to blow an account, but it depends on what kind of leverage is available and the time scale of the contest. (Edit: OK I just read it, it's 20:1)
If that proves useless in practice, the only other approach that would make a lot of sense (only 4 orders a day, that's tough) might be to average down whatever loser you get aggressively. This gives you a small but significant chance of completely blowing out in a short time frame.
OK here's something I don't understand:
they say maximum allowed leverage is 20:1, initial balance is $5000 and *only* 100,000 lot sizes are available. Doesn't that mean that as soon as you lose some money, you cannot buy 1 lot, and cannot trade?!
(
http://www.fxclub.com/contest/rules.html)