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How to build a repeatable edge with replay
An edge is a decision you can make again and again with a positive expectancy. The only way to know you have one is to run the same setup many times and measure the outcome, which is exactly what replay is for.
Isolate one setup
Pick a single, clearly defined setup. Replay day after day and take only that setup. Because you control the speed, you can gather a month of samples in an hour instead of a year.
Measure, then keep or cut
After enough reps, the numbers tell the truth: win rate, average R, and how the setup behaves in trends versus ranges. Keep what works, cut what doesn't, and you are left with a process you can trust under pressure.