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John Shipley: MLB's experimental “Challenge” system has legs
Manfred praises challenge system over fully automated strike zone
Is baseball ready for robot umpires? We fielded an informal survey
What is a strike in baseball? Robots, rule book and umpires view
What do robo-umps, challenge system mean for catchers? Some
The Automated Strike Zone Is Slightly Different At Triple-A in
Robot Umps Soon? MLB Testing Automated Strike Zone In Triple-A Games
MLB's automated strike zone debuts in Triple A Pacific Coast
Automated ball-strike (ABS) system, pitch timer, bigger bases tested