hi w :
thanks for asking....and below are my unprofessional views.
1stly, this trade setup is for intraday, as such, it is played out within a trading day, not an overnighter position...this is because index futures can be very costly. eg /ES is usd50 per point per contract. a 10 pt move on ONE contract will make or cost usd500 and after a while, traders go for > 5contracts per trade...
2nd, whether to trade this gap up or down, is dependent on a few parameters. One such parameter is the preMarket volume of these index futures. eg. /YM is e-mini DOW futures (we see them all at the top of Huat's page) starts trading actively 1.5 hours before cash market opens, and during this period, it opens for business by 9pm singapore time. for 1.5 hours, it reacts to all sorts of news, both economic and industrial. just like the cash index, we can also obtain the volume traded on such future indexes.
generally, if the volume is NOT high but the future index ticker shows a meaningfully large gap, then it is likely not sustainable during cash market environment. one reasoning of a low volume, is that that futures gap is emotions based trading.
3rd, gap trades must have stop loss and this order CANNOT be compromised. if a trader cannot accept this in a disciplined way, it is best not to trade gap plays. there's no guarantee that gaps are filled, although some literature will suggest that ~ 80% of gaps are eventually. since there's always the possibility of failure, the trader MUST set up a stop loss order as soon as the opening position is filled. it is also suggested that a target exit is entered (OCO order)
4th, if both cut loss and target profit stops are unfilled by 430am (all US index futures temporarily stop trading 15mins after cash market closes at 515am), the trader should conscientiously close off the opened position. as i've mentioned, futures trading can be very costly. /YM is $5 per 1 point. we have seen up to 800 points movements in a day and to be caught on the wrong side, is a usd4K loss just on ONE contract. any gap in the wrong direction, the next day, can be devastating....GTC stop limit orders may not get filled at all. so, stop limit orders CANNOT work on subsequent gaps. O/N is therefore very dangerous.
5th, if gap play is intended, entry price is subjective...some traders will use PIVOT points. S1,S2,S3, R1,R2,R3 are all marked clearly on the 5mins chart to help determine also exit and stop loss points. personally, i have not used Pivot points. I normally either look at Bollinger Bands, or 200MA/500MA on 5 mins chart to see where the resistance and support are...hence, if the gap price is in the middle of the bollinger band (daily chart), or between MA10/50 (daily chart), then the setup is not there for the trade
hear from you more on this...thanks..