rounding 1st on walks

Question
I have now had the same situation happen 3 times in the past 2 seasons, with 2 different calls being made.  12U fastpitch.  Batter draws a walk, steps on first and rounds the bag, with no intention of going to second base.  Before the runner reaches 1st the pitcher has the ball and is in the pitching circle.  2 times last season, our runner was called out.  This season (yesterday to be specific) the same situation happened.  When I called it to the umpire's attention, he said the runner is not out because she made no attempt to run to second.  Last season the umpire said the act of rounding the bag constituted an effort to advance. Which call is correct, and can you direct me to the rule that describes this situation?

Answer
Hi Ken,

yes I can, if I understand your q correctly, neither is correct although it appears yesterday the runner was not called out which is correct, but for the wrong reason.  Neither umpire it seems fully understands the LBR.

The LBR does not go into effect if the pitcher has the ball in the circle until the b-r touches 1st base.... ASA RS 34A
1)if the b-r stops on 1st they must stay there, they cannot stop and then leave

2)if they round the base they may stop once and then must immediately advance non-stop to either 2nd or back to 1st base.

ASA RS34F. A base on balls or a dropped third strike is treated as a batted ball if
the batter-runner continues past first base without stopping or stops only once and then immediately moves one way or the other. However, if the runner stops at first base and then steps off the base after the pitcher has the ball in the circle, the runner is out.

Based on our RS of course they may round the base and head non stop or with a stop for 2nd if they wish. I don't understand why an umpire would think advancing to 2nd w/ or w/out a stop would be illegal.

If your runner rounds 1st, stops and then immediately advances or withdraws non stop to the next base and they are called out, get the explanation and then bring out the "P" word.

Mark