The backtest assumptions perfectly match the realities of your broker’s execution, slippage, and commission structures. 2. Core Pillars of AFL Verification
[Briefly explain how the code works, e.g., "This strategy enters long when the 50-period EMA crosses above the 100-period EMA while the RSI is above 50"]. Timeframe: [e.g., 5-minute, Daily, Weekly]. Asset Class: [e.g., Equities, Forex, Indices]. 2. Verified AFL Code Always use code blocks ( ) when posting on the AmiBroker Forum to ensure it is readable and easy for others to copy.
Notice how the verified version explicitly zeros out all action arrays at the top of the bar.
// --- VERIFICATION FOOTER --- // Explanation: This code passes the "Future Leak Test" because: // A) It uses PrevHigh/PrevLow calculated via Ref(..., -1) // B) Trades execute on Open (after the bar has started) // C) Exits use ValueWhen to store entry price safely. _N(Title = StrFormat("NAME - VERIFIED Donchian | Periods: " + NumToStr(Periods, 1.0))); amibroker afl code verified
// Verification for Exploration Filter = Buy OR Sell; AddColumn( rsiVal, "RSI Value", 1.2 ); AddColumn( Buy, "Buy Signal", 1.0 );
// 4. Visualization Plot(Close, "Price", colorDefault, styleCandle); Plot(fastMA, "Fast MA", colorRed, styleLine); Plot(slowMA, "Slow MA", colorBlue, styleLine);
Never run unverified code directly on a live brokerage account. Test it on dummy data or a simulation account first. The backtest assumptions perfectly match the realities of
Before checking strategy logic, the code must pass the AmiBroker compiler.
: Change periods (e.g., from 14 to 20); the system should shift, not crash.
Run the code through . If it fails here, stop immediately. Timeframe: [e
Unknown Telegram channels, YouTube descriptions without downloadable .afl files (just screenshots of code), and forums from 2010 without updates.
: Without verification, the trader enters a live trade.
Verification extends to the backtesting environment. Applying these best practices will produce more reliable results.
Searching for the exact phrase is not just a technical chore; it is a risk management ritual. In this article, we will dissect what "verified" truly means, why 90% of free scripts fail verification, and how to perform a full-spectrum audit on your trading systems.
Understanding what can go wrong is just as important as knowing what "verified" means. Based on years of community experience and official documentation, here are some of the most frequent mistakes that render AFL code unverified and unreliable: