====== Ambiguous Bars ======

Forex Strategy Builder performs backtest of a strategy using historical bar data. It calculates each bar starting from the oldest one and finishes with the newest bar. The program interpolates every single bar using a special [[fsb:manual:interpolation_methods|interpolation algorithm]] chosen by the user. The interpolation method serves to designate a route that the market price follows inside a bar.

FSB knows four facts about that route;
  - The interpolation starts from the //Open// price of the bar;
  - The route passes through the //High// price;
  - The route passes through the //Low// price;
  - The interpolation ends at the //Close// price;

FSB doesn't know:
  - Whether the price touches the //High// price before the //Low// price or in the opposite order;
  - Whether the price fluctuates up and down and passes through specific prices one time or several times.

We mark a bar "ambiguous" when the backtester cannot decide for sure in what sequence to execute the orders.