when you are back testing with spread set at (2) . Is it a accurate model if the the spread at the time of the trade opening is 2 and the spread at the time of the trade closing is 20.
Ignored
If your real-time spread differs from the value in the MT4 tester this much, your backtesting results are VERY inaccurate.
There are 2 options to get high-quality backtests.
1. MT4 + third party software that allows you to download tick data and backtest with variable spreads (TDS, for example)
2. MT5 tester
The MT5 tester enables you to download your broker's tick data and backtest with variable spreads
