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
- This score is built entirely from exchange-quality decisions: when you start a trade the engine judges worse for you (by static exchange evaluation), segmented by whether you were ahead, level, or behind.
- Pawn structure, king safety, and piece-activity factors are surfaced as evidence but do not yet score — see the Doubled pawns and Isolated pawns pages.
The exact rule the X-ray Coach applies
- Bad exchange when ahead (greed): when already up material, how often you initiated an exchange the engine judged worse for you by SEE.
- Bad exchange in balance: when material was level, how often you initiated an exchange the engine considered worse for you.
- Bad exchange when behind: when down material, how often you initiated a further losing exchange instead of staying patient.
Why it matters
These three rates segment one underlying skill — initiator-side trade judgement — by material context. They are correlated by design, not independent signals.
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