1B. Hold the runner or play behind.

Typically, when a runner is on 1B, the 1B holds the runner on 1st. But, certainly there are times when it is prudent to play behind the runner.

Playing behind the runner is essential if the manager or coach believes that the potential run on 1B is an unimportant run. If the head coach thinks that it is more important to get outs than hold runners at 1st base than the first baseman should play behind the runner at first.

Here is the one caveat though. You must be aware of your infield capabilities when doing this. It's just not as easy as saying "we've got a 2 run lead and it's the seventh innning." Keeping the runner at 1B allows infielders to get force outs at 2nd base. This throw is certainly easier and it takes some pressure off of amatuer infielders. If the coach believes the run is unimprtant yet believes the risk is worthy of keeping the force at 2nd- then he may choose to continue to hold him on.

Furthermore, if the coach believes the likelihood of hitting the ball through the "4 hole" his unlikely, he may choose to continue to hold the runner on. This likelihood could be based upon the pitcher's tendencies for contact or the batters tendencies for contact. If a finesse pitcher is on the mound and a righty hitter is up- maybe it doesn't make sense for the 1B to play behind the runner and just give the runner 2nd base.

Again, recognizing important runs vs. unimporatnt runs is the easy part. Deciding where to play the 1B, a little more tricky.