bayes replay: in-play policies on synthesized live markets

← lab · model run 18 · in play vig 0.06 · matches replayed 3,454 · ran 7/7/2026

What this is: A one-off study — its numbers below are exactly what the run reported.

note	Live market is SYNTHETIC (closing-line lambdas conditioned on the live state) — it re-prices rationally, so overreaction edges are invisible here by construction; roi_at_vig applies a 6% in-play haircut. Grade vs REAL live odds accumulates in af_live_odds.
model run	18
in play vig	0.06
matches replayed	3,454

policies

bets	policy	staked	seasons	hit rate	roi fair	roi at vig
2,203	fade_overreaction	22,030	10	0.118	0.3502	0.2762
5,330	value_stream	53,300	10	0.2	0.2789	0.2142
4,035	double_down	40,350	10	0.28	0.1492	0.097
4,580	cover_lock	30,483	10	0.255	0.0296	-0.0125
2,920	prematch_only	29,200	10	0.335	0.0249	-0.0166

AUC	predictability: 0.50 = coin flip, ~0.70 = ceiling for sports
Importance	how much the model leans on this factor (permutation importance)
Direction	sign of the raw correlation with the outcome
Survives all eras	effect points the same way in every historical era

Spec · the reproducible recipe

{
  "kind": "bayes_replay",
  "stake": 10,
  "live_edge": 0.08,
  "model_run": 18,
  "in_play_vig": 0.06
}