ov-mlb live win-probability monitor

Modeled fair P(home team wins) for any game state — the pricing spine of the in-game edge.

Game state

Occupied bases

Fair price

49.3¢
P(home wins) = 0.493
Home token49.3¢implied 0.493
Away token50.7¢implied 0.507

Empirical WE table

P(home) = 0.514

shrunk Beta-Binomial baseline · 29 samples in cell

Base-out context

Run expectancy: 0.28 runs

P(batting team scores ≥1): 0.17

from the (outs, base-occupancy) tables the model fits as priors

Calibration (test set)

BrierLog-lossECE
calibrated model 0.1514 0.4534 0.0624
WE table 0.2146 0.6202 0.1534

393 games · 6004 test plays · home-win rate 0.518 · built 2026-07-26T16:47:52+00:00