So, either runner on 1st (attempting to steal on pitch) and 3rd, or runner on 3rd and batter walks (and continues on to second); where should defense throw the ball? My take; throw the ball directly to pitcher, forcing runners to commit (12U, chance of throwing runner at second out low). Throwing to second to bait runner on third to run home results in runner safe at second, runner at third either retreating back safely or low probability of throwing out at third (if throw is to 2nd base - remember, this is 12U....). If ball is thrown to pitcher, maybe better chance of runner on third out due to hesitation? At the very least, you shorten the throw to second. What are your thoughts on how to approach this situation?
With two outs and a runner on third, and the batter walks and tries to take 2nd base before the pitch I will go for that runner every time. It should only take one throw if the girls get the timing of the play down.
Get the ball back to the pitcher quickly, and the pitcher then checks the runner on 3B. This forces the runner leading off 3B to make a decision, and she'll likely retreat back to the bag. The pitcher should hold the ball in her glove in a high "ready to throw" position, but don't make any fakes. If the pitcher doesn't attempt a play, or make a fake throw, the runner on 3B can't leave the bag again without being called out (assuming blue is paying attention).
3-4 seconds has now passed, and if the batter-runner rounds 1B, the 1B calls it, and pitcher locks in on that runner, but does not make any move to throw unless the runner gets at least half-way to 2B. The runner may jog to draw out this process. Don't throw to 2B unless there is a reasonably good chance of immediately getting an out, because with less than two outs, you will likely give up a run. DON'T throw the ball too early, or you'll be chasing that runner back and forth. If the throw is quick, on target, and on time, the tag can be made at 2B and then the ball can immediately be sent Home. Make sure that whoever is covering 2B isn't obstructing the runner.
The catcher should be watching the runner on 3B immediately after returning the ball, and call for the throw if the runner on 3B breaks for Home instead of returning to the bag. If the pitcher throws to 2B, the pitcher can then move towards 3B to back up in case of a pickle play.
It's a complex play that requires discipline that can only be gained through live-ball practice.