If B4 hits a ground ball but interferes with F3, does R3's run count if he touched home plate before the interference?

In the scenario provided, the key rule at play is the concept of interference and its impact on runs scoring. When B4, the batter, hits a ground ball but interferes with F3 (the first baseman), the act of interference negates any run scored by R3, regardless of R3's timing in crossing home plate.

Interference is a violation that can impact the outcome of the play, and when a batter interferes with a fielder, it typically results in the offense being penalized. Even if R3 touches home plate before the interference occurs, the act itself constitutes a significant violation which leads to the nullification of that run. The rules dictate that a run will not count if there is interference by the batter.

This ruling intends to maintain fairness in the game by ensuring that defensive players have the opportunity to execute plays without unfair obstructions. Therefore, in this case, the run does not count due to the interference committed by B4.