MLB umpires get defensive about how they interpret controversial home plate collision rule

MLB umpires still struggling to interpret home plate collision rule correctly - Sports Illustrated

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Baseball umpires aren't blind. They just have trouble breathing, study of balls and strikes shows

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Rule change hurts Diamondbacks in loss to Phillies

MLB says Anthony Rizzo violated the home-plate collision rule in Monday's game but won't be disciplined - ESPN

Home plate collisions rule: Reactions from around the game

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Umpires review collision for Yanks-Blue Jays

What is the rule regarding catchers blocking home plate in Major League Baseball (MLB)? If it is not legal, why isn't this called more often? - Quora