Certainly not the best week to start this experiment. Buying the cash close and selling the cash open yielded a gross return of - 46,00 ES points this week - assuming actual close/open prices and not considering commissions.
If we count the entire year so far. 10 trading sessions. The result is - 15,25 points.
So, currently the system is in drawdown.
If we look at December 2020, the end result was + 77,75 points. However, there were 8 gaps down with the two largest being - 44,50 and - 23,25.
So, if being stopped on that largest gap down, the end result would probably be worse.
I believe this is a strategy that probably comes ahead in the end in a rising market, but it requires deep pockets and will face some huge drawdowns. As such - it probably isn't a suitable strategy for compounding as one large gap down will erase much or all your profits made earlier on smaller size.
If you trade it less aggressively, well, then you should be okay in the end.
Here's the gross result for 2020. End result = + 545,25. Maximum drawdown = -854,25.