Traders must strive to decipher whether today's unexpectedly bullish price action was an upward head fake in a further downward market or the "real McCoy" of a solid bottom from which prices will start to work higher for a substantial time.Yesterday's indecisive close in December Chicago wheat seemed to be the tipping point that enabled it to obtain the leadership position in taking grain contracts higher today. The tug-of-war in trading dynamics, discussed in yesterday's market commentary, is primarily credited with this abrupt upward momentum in wheat. It was not export demand because only 37 percent of total U.S. wheat export sales commitments have been completed so far this season against a normal five-year pace of 45 percent, and the s...