[_Bruno_]

Originally Posted by mbyron

Standard OBR interp (J/R, etc.) is that a fielder may block a base if a play is "imminent," where "imminent" is defined as the ball over the infield. So, if F2 blocks the plate when the outfielder still has the ball, that's OBS; if he blocks it when the ball is over the infield, he's OK.

Since the throw from F1 to F3 on a pickoff is always an "imminent" play, F3 is OK to block the base once F1 has thrown the ball.

QED.

thanks ;-)