1 x Introduction (4.00 avg depth)
19 x 1) 4...Nf6 5.Bd3 Bd6 (16.47 avg depth)
5 x 2) 4...Nf6 5.Bd3 c5 (15.20 avg depth)
7 x 3) 4...Nf6 5.Bd3 Be7 (15.71 avg depth)
5 x 4) 4...Nf6 5.Bd3 Bg4 (17.40 avg depth)
26 x 5) 4...Bd6 (16.42 avg depth)
18 x 6) 4...Nc6 (17.78 avg depth)
7 x 7) 4...Bg4 (15.14 avg depth)
26 x 8) Early Deviations (13.42 avg depth)
12 x 9) Petroff Sidelines (13.25 avg depth)
10 x 10) Model Games (47.20 avg depth)