What is the ruling when R1 slides illegally into second base during a force play?

The correct ruling when R1 slides illegally into second base during a force play is that both R1 and B2 are out due to the slide. In this scenario, R1's illegal slide is considered a form of interference with the defender attempting to make the play.

In baseball, rules are in place to protect players, and slides that are deemed illegal—such as those that are excessively aggressive, or that target the player rather than the base—result in consequences such as the offending runner being called out. Furthermore, if the slide is deemed to have interfered with the defensive player’s ability to make the play, it can result in an additional out, thus putting both R1 and B2 out.

This ruling reinforces the importance of safety and sportsmanship in the game. Enforcing such rules helps ensure that all players are respected and protected during competitive play. As a result, both players face penalties for the illegal actions taken during the play.