Trevor’s Corner, Week 6: Young-Defibaugh

From NM Trevor Magness:

In this position from the game Young – Defibaugh in last week's match between the Blaze and the Kingfishers, it may look at first glance that black has achieved a fine position out of the opening. However, black has overlooked a powerful tactic. How did white reach a winning position from this seemingly innocent one?

Click here for the solution.