By looking at the EOD data, this system always will look like that it works. Let us take an instance, suppose Reliance Open is 2150 and High is 2150 at 10.30 am. It breaks this level at 11.30. Now after EOD when you look at the open, high, low, close you will not come to know that the open and high were same at 10.30. So how can we judge the success? Because after the day is over, Open will be same as High or Low if the trend has been one way.
This IMO is similar to doing the analysis by looking at the RHS of the charts.