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Judgment, Mike, judgment.
Much like the judgment of inteference or obstruction on a muffed batted ball. There we use the "step and a reach" rule of thumb. Greymule metioned the "body length" rule of thumb above.
Other clinicans use the "I know it when I see it" line. Obviously if the runner is cutting across the corner to shorten his distance that IS a gross miss. If the runner steps over the base, that is usually judged to NOT be a gross miss, therefore it may be corrected by last time by.
It's not rocket science, just common sense and judgment.
Roger Greene
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