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
- When your opponent blunders, a tactic is often on the board. This category measures how often you failed to capitalize on that chance.
- The coach asks Koga to classify the position by tactic type. Seven tactic types are tracked for capitalization; each becomes a missed-<tactic>-capitalization rate.
The exact rule the X-ray Coach applies
- Missed-capitalization rate: share of moves where the opponent slipped but you did not punish it. Excludes time-trouble moves.
- Tracked tactic types (from Koga's classifier): hangingPiece, insufficientlyDefended, capturingDefender, fork, counterThreat, attackingPinnedPiece, destroying.
Why it matters
Capitalizing on the opponent's mistakes is where rating points are won. Per-tactic peer curves are still being built; today the breakdown is descriptive evidence.
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