It’s a double play! When it comes to keeping the scorebook in baseball, each position on the field has its own number associated to it. With a runner on 1st, if a SS fields a ground ball, tosses it to 2nd base for the force out, then the 2nd baseman turns and successfully throws the runner out at 1st base, the scorebook keeper would record that as a 6-4-3 double play!

Now you know!