Coach definition, not a live verdict. These pages show how the X-ray Coach defines this concept and where its thresholds sit, sourced from the coach's own code. Unlike the tactic pages, nothing here runs a live detector — example boards illustrate the rule, they don't execute it.
What it means
- The mirror of WWP: when you are clearly worse, how often you still scrap your way to a draw or a win instead of folding.
- As with WWP, a position only counts as 'lost' when several conditions hold together — a single bad-looking move does not qualify.
The exact rule the X-ray Coach applies
- A position is a Saving-Lost-Position when eval ≤ -300 cp AND material ≤ -300 cp AND you have been on a losing streak of ≥ 6 consecutive moves.
- Fallback (no material/streak context): eval ≤ −300 cp, or win probability ≤ 0.25.
- Crumble rate: in difficult positions, how often you blundered further (lost ≥50% of remaining win probability) while the opponent played accurately — a resilience signal.
How it's scored
- Conversion is measured at four eval thresholds (−1, −2, −3, −4 pawns); success = a win OR a draw (a saved position).
- At −3, roughly: 3% save-rate → score 0, 9% → 50, 20%+ → 100. (Saving deep deficits is rare, so the bar is intentionally low.)
Why it matters
Resigning lost positions early forfeits the half- and full-points that opponents hand back under their own pressure.