Visible fixed set minus board-only membership.
Experiment E028 / terminal paired aggregate
The prompt did not whisper.
It pulled.
Across the same 48 chess positions, merely showing one fixed five-move set changed whether Luna answered inside that set by 93.75 percentage points.
48 paired positions192 registered callszero missing cells
Replay the intervention
Five moves are visible
95.8%responses inside the fixed five-move set
Board only2.1%
Suggestions visible95.8%
Position-level percentile interval.
Registered within-position label randomization.
What this establishes
Guidance is causal.
Quality is unmeasured.
The visible-set arm landed inside the supplied set 95.8% of the time; the board-only arm did so 2.1% of the time. The paired design isolates the presentation of that same fixed set.
Evidence boundary. Development-only causal effect of showing one fixed five-move suggestion set on Luna set adherence; no move-quality, Elo, vision, search, or candidate-generation claim.
We can sayThe visible set strongly guides Luna's answer.
We cannot sayThe set improved chess strength, search, vision, or Elo.
Limits carried into the page
- The outcome is membership in one fixed five-move suggestion set, not chess strength or move quality.
- The experiment used one dated Luna model snapshot and development-exposed Black positions.
- The board-only arm's low legal-action rate is itself part of the measured prompt-format behavior; it is not an Elo estimate.
- No E027 action or outcome was imported into this fresh response cohort.