Lost money after costs, 40.4 points behind buy and hold.
Bollinger band reversion · 14 global commodity futures
It returned −7.0% in total over the test, after costs; buying and holding over the same period returned +33.4%, 40.4 points more. It lost money after costs over the period. Its checks still ran and are shown below for reference: with no gain, a passed check doesn't point to an edge.
The rules: Enters when the price drops below the lower Bollinger band (20, 2); leaves when it closes back above the middle band.
StratLab ran these rules through its own backtest on every stock in the group, after costs, and through four checks: unseen years, nearby settings, a bad-luck drawdown and enough trades. The page shows the return beside buy and hold and the result of each check. A verdict describes the past, not what comes next, and nothing here is investment advice.