Don't get too excited about three months worth of results, especially the trading isn't with real money. First off, the timeframe is way too short to give a really assessment of the system's performance. Could have just been an optimal spell for the bot.
Secondly, since the competition wasn't "live" there is no concern about risk. The bot creator is trying to win. It wouldn't really matter how poorly the thing performed if it didn't. The competition entrant wouldn't feel any pain. That means it could have been taking insane amounts of risk, which is pretty likely given the results.
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