for EURUSD i only found that two or three time there where some gap in last 8 month from January 2012. more over there is great problem the gap is not predictable without knowing the news of sat and sun day and you never able to open position in this day. so this is a blind way to open some trade in fry day night and if luck favor you may get some profit. though it is only once in a week so i hope it will not give so many points to us.