I am late posting this because my day job sometimes intrudes into trading time, but in checking the weekly Nadex S&P500 on Monday it looks very unsettling like it could be a down week, but with the chart finding support after a few days down by late Monday I decided to enter the market when it was temporarily in the money but the bid/offer had not quite caught up. I bought calls at 2078 for $60 and now they are holding well in the money and I am looking to close out the week holding my position into expiration.
The regular OHLC chart looked worse than the Renko chart although it was a bit of a leap of faith that the pattern would hold. So far, it is all good news.