When B3 hits a ground ball and R1 slides illegally, what happens to R1?

When R1 slides illegally, the action is typically considered interference. In baseball, this means that R1's actions are deemed detrimental to the defensive player's ability to make a play on the ball or to tag R1 out. When interference is called, the player who interfered is often ruled out as a penalty for their actions. In this case, since R1 slid illegally into the base, the appropriate ruling is to declare R1 out due to interference.

This reinforces the importance of players adhering to proper sliding techniques, as illegal slides can disrupt gameplay and also pose a safety risk to both the runner and the fielders involved. Therefore, when interference occurs in this context, the outcome is that R1 is ruled out, confirming that the ruling aligns with baseball's regulations around player conduct during plays.