Question 1

Does a winning trade screenshot prove a strategy works?

Accepted Answer

No. A single screenshot shows one chosen outcome out of many possible ones. It says nothing about how often the rule wins, how big the losses are, or how many trades stood behind it.

Question 2

What actually counts as evidence for a trading strategy?

Accepted Answer

A tested sample of trades over real history, read for win rate, expectancy, drawdown, and trade count. The number of trades and the size of the worst losing stretch matter as much as any single result.

Question 3

Why is one good chart misleading?

Accepted Answer

Because you can almost always find one chart where any rule looked perfect. Showing the best case while hiding the losers is cherry-picking, and it tells you about the chooser, not the strategy.