On Board 1, Mackenzie Molner played a Nimzoindian line that I've always found attractive in the abstract, but never understood well enough to risk in tournament play. (Black's bishop appears to be trapped after 6...Ba5, but not really.) Shulman plays for the center, eliminates the pesky Nc5, and creates weaknesses in the Black camp on e6 and c6. But Molner defends well until a slip on move 39.
Find White's winning move in the diagram below!