Scrabble Triple Word Score Question
From the official rules on Hasbro's website:


  Premium Word Squares: The score for an entire word is doubled when one of its letters is placed on a pink square: it is tripled when one of its letters is placed on a red square.


The Triple Word square triples the value of any word played on it. So in your example, SO would score triple points, but PICKLES only scores normally. However, if the triple word square was directly to the right of PICKLE, then by placing the S on it you'd triple the score for both words.