Blue Notes · Umpire Grade2026-05-28
CHC @ PIT
Home plate: Dan Bellino
“The zone kept its promises.”
Umpire Grade
95.7% accurate
Run Favor
runs, CHC
ABS Overturns
of 3 reviewed
What this shows — how Dan Bellino called the 188 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 180 right. Below, only his misses are plotted, alongside every pitch the ABS (Automated Ball-Strike System) reviewed on a challenge.
The zone, as he called it
strike called ballball called strikeABS overturnedABS upheld
The calls that moved the game
- 1-0.39▼5 · 2-2 ball called strike
Henry Davis vs Colin Rea - 2+0.19▲9 · 2-0 strike called ball
Pete Crow-Armstrong vs Yohan Ramírez - 3-0.13▼8 · 1-1 ball called strike
Tyler Callihan vs Trent Thornton
Run impact from the count run-value table: a missed strike three is worth far more than one on 3-0.
ABS — the Automated Ball-Strike System
3 pitches went to the robots · 2 overturned (ump overruled) · 1 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.
- 1Miguel Amaya — ump said ball, robot ruled strike: overturned.
- 2Henry Davis — ump said ball, robot ruled ball: upheld.
- 3Miguel Amaya — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 2 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.