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Blue Notes · Umpire Grade2026-04-11

PIT @ CHC

Home plate: Alex MacKay

“A steady night's work behind the plate.”

B+
Umpire Grade
93.7% accurate
0.1
Run Favor
runs, CHC
4
ABS Overturns
of 8 reviewed

What this shows — how Alex MacKay called the 206 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 193 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

Challenge 1: Henry Davis — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Edward Cabrera — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Miguel Amaya — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Spencer Horwitz — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).4Challenge 5: Nico Hoerner — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).5Challenge 6: Henry Davis — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).6Challenge 7: Miguel Amaya — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).7Challenge 8: Joey Bart — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).8
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.30▼10 · 3-1 strike called ball· challenged ✓
    Miguel Amaya vs Yohan Ramírez
  2. 2+0.28▼1 · 1-2 strike called ball· challenged ✓
    Alex Bregman vs Braxton Ashcraft
  3. 3+0.20▲4 · 2-1 strike called ball· challenged ✓
    Brandon Lowe vs Edward Cabrera

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

8 pitches went to the robots · 4 overturned (ump overruled) · 4 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Henry Davis — ump said ball, robot ruled strike: overturned.
  2. 2Edward Cabrera — ump said ball, robot ruled strike: overturned.
  3. 3Miguel Amaya — ump said ball, robot ruled strike: overturned.
  4. 4Spencer Horwitz — ump said strike, robot ruled strike: upheld.
  5. 5Nico Hoerner — ump said strike, robot ruled strike: upheld.
  6. 6Henry Davis — ump said ball, robot ruled strike: overturned.
  7. 7Miguel Amaya — ump said strike, robot ruled strike: upheld.
  8. 8Joey Bart — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 8 of 8 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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