Something to consider: in 2014 NCAA softball the run expectancy differential between 1st n 3rd no outs and just 3rd with 1 out is greater than a full run (see image). So assuming you can hold the runner at 3rd and you make the out at 2nd, you are saving a run. That said, the run expectancy differential between 1st n 3rd and 2nd n 3rd, both with no outs, is only 0.3 runs greater. So to let her run to 2nd uncontested is only likely to cost you 0.3 runs. I don't have the math right now to give a number, but you'd need a decent probability of holding the runner at 3rd to make taking the chance on a throw down pay off.
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