Cost check
Does it still win after spread and commission?
- Costs as a share of gross profit
- At most 15%, killed at 25% under 3× spread
0%At most 15%40%
Under 25% at 3× the spreadIf it fails:Killed at the gates
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Spread, commission, swap and slippage come off every trade. A strategy whose edge lives inside its costs stops at the gate.
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The cost check and the sample check run first, on every setting. A setting that fails either one never reaches the hold-out.
Does it still win after spread and commission?
If it fails:Killed at the gates
Does the test have enough trades to judge?
If it fails:Killed at the gates
Upload your broker's contract details and, on the paid plan, the spread and swap in the test are the ones you actually pay.
A killed result is not an error. It tells you which question the strategy could not answer.
It did not pass the basic checks, such as costs and the number of trades.