5 x The Scandinavian (12.80 avg depth)
44 x The Icelandic Gambit (10.32 avg depth)
33 x Portuguese Variation: Quiet Line with 4.Be2 (14.67 avg depth)
57 x Portuguese Variation: Classical System with 4.Nf3 (14.72 avg depth)
53 x Portuguese Variation: Critical Line with 4.f3 (15.98 avg depth)
19 x The Modern Variation (18.05 avg depth)
33 x Odds and Ends (11.27 avg depth)
83 x The Albin Countergambit (12.87 avg depth)
68 x The Stonewall: an unbreachable fortress (16.22 avg depth)
31 x The English and the Réti (12.00 avg depth)
67 x The irregular openings (9.88 avg depth)