2 x Introduction (1.00 avg depth)
81 x Quickstarter Guide (13.69 avg depth)
35 x 1. 2nd move Sidelines after 1. e4 e5 2. Nf3 (11.57 avg depth)
19 x 2. Italian 3rd move Sidelines (13.32 avg depth)
41 x 3. Two Knights Defence 3... Nf6 4. Ng5 Sidelines (17.54 avg depth)
51 x 4. Two Knights Defence โ Main Line 8. Bd3 (21.55 avg depth)
35 x 5. Italian 3... Bc5 โ 8... Be7 & 8... Bb4+ Sidelines (17.89 avg depth)
64 x 6. Italian 8... Bb6 10th moves Sidelines (21.42 avg depth)
53 x 7. Italian 12... Nxc3 & 12... Bg6 Main Lines (25.17 avg depth)
48 x 8. Petroff 3... exd4 and other 3rd moves (17.81 avg depth)
44 x 9. Petroff 3... Nxe4 4. Bd3 Nc6 and 4... d5 Sidelines (16.70 avg depth)
36 x 10. Petroff 4... d5 5. Nxe5 Bd6 (18.28 avg depth)
33 x 11. Petroff Main Line 5... Nd7 (7... Qh4 & 7... Be7) (20.24 avg depth)
42 x 12. Petroff Main Line 5... Nd7 (7... Bd6) (20.93 avg depth)
67 x 13. 1... d6: Pribyl Defence (3... c6, 4... Qa5) (18.04 avg depth)
58 x 14. Philidor: 3. Nc3 e5 (18.60 avg depth)
19 x 15. Philidor: 4. Nf3 Nbd7 (16.79 avg depth)
18 x 16. Philidor: 7. Re1 Sidelines (16.67 avg depth)
17 x 17. Philidor: 7. Re1 c6 (16.59 avg depth)
22 x 18. Philidor: 8. a4 a5 (20.50 avg depth)
33 x 19. Pirc: 3. Nc3 g6 - Black delays ...Bg7 (14.85 avg depth)
78 x 20. Pirc: 4. Be3 Bg7 (16.54 avg depth)
42 x 21. Modern: 1... g6 Sidelines (12.95 avg depth)
22 x 22. Modern: 4. Be3 Sidelines (14.09 avg depth)
31 x 23. Modern: 4. Be3 a6 (18.52 avg depth)
77 x 24. Alekhine: 4. Nf3 Sidelines (16.47 avg depth)
45 x 25. Alekhine: 4... Bg4 (20.47 avg depth)
44 x 26. Alekhine: 4... dxe5 Sidelines (17.18 avg depth)
54 x 27. Alekhine: 4... dxe5 5. Nxe5 c6 Main Lines (18.98 avg depth)
10 x 28. Scandinavian: 2. exd5 Sidelines (9.90 avg depth)
52 x 29. Scandinavian: 2. exd5 Nf6 (13.02 avg depth)
62 x 30. Scandinavian: 3. Nc3 (16.52 avg depth)
20 x 31. Scandinavian: 3... Qd6 Sidelines (14.85 avg depth)
13 x 32. Scandinavian: 3... Qd6 - 5. Nf3 g6 (19.38 avg depth)
18 x 33. Scandinavian: 3... Qd6 - 5. Nf3 c6 (17.72 avg depth)
60 x 34. Scandinavian: 3. Nc3 Qa5 (14.58 avg depth)
68 x 35. Nimzowitsch Defence (1... Nc6) (14.97 avg depth)
39 x 36. Owen's Defence (1... b6) (13.72 avg depth)
34 x 37. Unusual Defences (13.26 avg depth)