Buy a Chestnut Scorer to Roast Chestnuts at Home | Eater
"An online retailer sells an inexpensive chestnut clip—also marketed as a chestnut scorer—that uses a steel, serrated X built into a nutcracker-like base; you place a chestnut on the base, press down, and the shell is scored safely and quickly, eliminating the need for knives and reducing the risk of injury. Priced around $14.99, the tool is presented as an affordable, single-purpose gadget and a low-cost gift that has delighted the author's family." - Terri Ciccone