The way I think of gaps is that the open of the current bar must be outside the range of the previous bar to qualify as a gap. Do traders simply look at the last close? For example, ES range on 1st May was 1391.25 - 1411.75 (RTH), close was 1400.5. Subsequently it opened lower at 1394 (RTH) on 2nd May, which happens to be lower than the close on 1st May, but still within the range of the previous bar. Would this be considered a gap? Note that I'm referring to the ES on the daily chart only, I'm not talking about the lower time frames. Would appreciate inputs on this.