Blind Chart methodology
How a chart pair is made.
The real side uses historical daily closing prices from an active Colombo Stock Exchange instrument with sufficient observations. The synthetic side begins at the same value, has the same number of points, and is adjusted to finish in the same direction with approximately similar day-to-day volatility. Labels and absolute prices are hidden so visual texture—not company familiarity—drives the choice.
Historical input
A real archived CSE window supplies the shape and volatility reference.
Matched decoy
A seeded random walk is built to avoid an obviously easy comparison.
Calibration
The score compares confidence with whether the decision was actually correct.