What is the ruling when R1 slides out of the base path to prevent F4 from turning a double play?

In this scenario, the action of R1 sliding out of the base path to interfere with F4’s ability to execute a double play is a clear violation of the rules regarding base running and interference. When a runner deliberately leaves the established base path with the intent of interfering with a fielder attempting to make a play, this constitutes obstruction of the defensive team's efforts.

The ruling in this case leads to both R1 and the batter-runner being declared out, as the intentional act of interference impacts the defensive team's ability to make the play legally. If a runner interferes with a fielder’s opportunity to make a play, it is appropriate to call both runners out to ensure that the integrity of the game is maintained and to discourage deliberate acts of interference. This ruling supports fair play and upholds the defensive team's rights during a play at the bases.