context: 1. b1c3 Firouzja has played this move even in standard chess (see below), so why not in rapid $2 1... c7c5  2. d2d4  2... c5d4  3. d1d4  3... b8c6  4. d4a4  4... e7e6  5. e2e4 It is an original Sicilian now.