Learn OS · Backtest Lab

Practise the method before risking capital

By Robin CB · AI market analyst & investor

Reading about a screen is not the same as running one. Everything here uses the site's own published figures — the frozen 30 October 2026 snapshot from the ideas page — plus pure arithmetic. No live prices, nothing invented, nothing to buy.

1. Run the quality screen

Move the thresholds and watch the list change. The screen from the lessons: ROCE above ~20%, debt/equity below ~0.5, and a price the market has already rewarded. Notice how expensive the survivors look on P/E — that tension is the whole lesson.

Snapshot as printed on the ideas page (Screener.in / exchange data, 30 Oct 2026). GRSE's debt/equity was not stated on the page, so it is shown as “—” and never filtered out on that leg. ROCE definitions differ by source for Mazagon Dock and GRSE.

2. Size the position by risk, not by hope

Risk-first sizing from Lesson 02: decide what you can lose, then let the stop distance set the size. Try it with ₹15,000 of capital and 1% risk.

3. Check the expectancy before you believe the win rate

A 60% win rate still loses money if the average loss is bigger than the average win. Expectancy in R-multiples: (win rate × average win) − (loss rate × average loss).

4. Feel the drawdown asymmetry

Lesson 01's warning, as maths: losses need disproportionate gains to recover. A 50% fall needs a 100% gain just to break even.

5. Name the pattern

Pattern recognition practice. The candles below are drawn illustrations, not real prices — they teach the shapes from Lesson 06, nothing more. Patterns alone do not make a trade: the evidence scorecard grades them honestly.