Hi Falcon,
Shirleys example is correct. (thanks for pointing that out) The first two would be accepted, and the third would not.
In my answer above, I was thinking bids were within one increment of the current min bid. In Shirleys example, If the current min bid was $11.85 instead of $9.50, only one would be accepted.
In any case the bids not accepted should get a bid to low message.
Clear as mud ?