I have backtested it over the past 3 yrs, and the results aren't bad (despite some massive losses along the way). Unless IK modifies his strategy recent results are the same as what is posted on the stats page of the site, but further back the 2 diverge, and on one occassion a negative result is posted on the site as a positive one (exact same value, sign reversed).
Over the past 3 yrs, after taking into account a 25pt spread per trade, the system has returned 6705 pts. The biggest gain was 800pts (around Sep 11), the biggest loss was 500pts. My calculations may have faltered along the way (had to work out profit manually). Thanks to bigbusiness and citroen for posting the formula (it's actually 7 days back you need to use)
I would like to post the spreadsheet on here. Is it ok to do this? Alternatively, whoever wants it can send me a private msg with their email, and I will email it out to them this evening when I am back home (BB will send to you as a matter of course)