====== Trading Rules ======


EA Studio strategies consist of three parts:

  - **Strategy Properties** – the trading amount, Stop Loss, and Take Profit;
  - **Entry Rules** – indicators that determine the conditions for opening a position;
  - **Exit Rules** – indicators that determine the conditions for closing the position.

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Every part of the strategy is responsible for a specific task. 

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In order to make the strategies and exported Experts fast and reliable, we provide a predefined strategy structure. This is the main difference between the experts created with **EA Studio** and the experts written manually in MQL. All EA Studio EAs follow a specific design that guarantees that the backtest and the subsequent MetaTrader historical test and trade will be equal. 

This approach to strategies/EAs has several very important advantages:

  * it provides an unlimited number of combinations;
  * the backtest is extremely fast and the automatic generation of experts is possible;
  * the backtest is extremely reliable;
  * live trading signals correspond to the backtest signals (provided that there is no slippage).

EA Studio follows strict trading rules:

  - All positions open at the beginning of a bar. (We use the term **Bar Open** to identify that. **Bar Open** is the first tick of a new bar.)
  - The strategies are symmetrical – the long trading rules perfectly mirror the short entry rules, in the opposite direction. This principle guarantees that the strategies will work on both bullish and bearish markets. If a pattern is identified, they will act on it.
  - This is why you set only long trading rules in the indicator slots.
  - The strategy(or exported Expert) will open a position when all the **Entry Rules** are satisfied.
  - If there are no **Entry Rules** the strategy won't open a position.
  - If all available **Entry Rules** are satisfied in both directions this means there is no "clear" signal to indicate in which direction to trade therefore the strategy will abstain from opening a position.  
  - The strategy will close its positions at Bar Open. Exceptions are the Stop Loss and the Take Profit.
  - If there are no Exit Rules, the program will close every open position at the beginning of the next bar.
  - If there are Exit Rules, the strategy will close its positions when only one Exit Rule is satisfied. Similar to **Entry Rules** the **Exit Rules** are symmetrical for long and for short positions.

{{:eas-guide:expert-advisor-strategy-structure.png?nolink|Expert Advisors}}

You can find more info and examples in the other sections of this help.

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