Like you said, it's a starch thing. Here is what I found: Red, new, waxy, or boiling potatoes (yukon gold I think are also in this category) are supposed to have less starch and fewer calories than all-purpose and baking potatoes.
Either eat half a potato tonight or know that a potato is much better for you than a candy bar and take the extra 70 calories :) If staying completely within your calorie range is vital, maybe you can compensate somewhere during your other meals today.
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