Exact square root · no rounding · one ruler for every day of the backtest.
Level ladder
Current price Resistance (above) Support (below) 90° — primary level
Read this once. These levels come from a fixed formula, not from any
proven edge — Gann's Square of 9 has no established statistical backing.
This tool exists for one reason: to keep the math identical every day
so your backtest measures the method, not your rounding. Score each angle
separately, on every single day — including days a level is never touched.
Never pick the winning level after seeing what price did. If you have to
squint to call it a reaction, it wasn't one.