Glossary

Open-to-close grading

Each call is scored against the same session's open→close move — the only return a pre-open call could actually capture.

Every prediction is graded against the open-to-close return of the exact session it was made for: the session's opening price to its closing price. A call is published before the market opens, so the first moment anyone could act on it is the open — the overnight gap is not capturable and is therefore not counted.

Grading is strict about dates: the price bar must be dated exactly the call's session. If that bar is missing the call stays ungraded (a stranded call) rather than being scored against the wrong day.

Related: Directional precision · Stranded call · Pre-open lock

Full grading rules: methodology.