This Strategy is based on the Strategy from Rene Wolfram and the relationship between the british Pound (GBP) and USD.
According his public strategie he sell the GBP/USD on Monday, Tuesday and Friday at 7:45 hour (MEZ) and close it at 13:00, if he is not stopped out. With an additional Filter we recieve the best results on Fridays. The only day which we use.
Implementation could be done with a Future, Contracts for Difference (CFD`s). Broker & Definitions
Experienced traders with knowledge of technical analysis can use the strategy on Mondays or Tuesdays with e.g an additional Indicator e.g. moving average.