1. Classical. Mason Variation. B Wall vs K Lawless, 1973  (C42) Petrov Defense, 15 moves, 0-1 2. Classical. Koltanowski vs McKeag, 1936  (C42) Petrov Defense, 15 moves, 1-0 3. Classical. J Cervenka vs NN, 2002  (C42) Petrov Defense, 18 moves, 1-0 4. Classical. Mason Variation. Wei Yi vs Li Chao, 2018  (C42) Petrov Defense, 50 moves, 1-0 4 games