5 x Introduction (4.20 avg depth)
1 x Main Position (3.00 avg depth)
55 x 1. Berlin Defence (4.93 avg depth)
45 x 2. Bird’s Defence (5.53 avg depth)
45 x 3. Classical (5.36 avg depth)
45 x 4. Closed (4.13 avg depth)
50 x 5. Exchange (5.28 avg depth)
45 x 6. Marshall (5.69 avg depth)
45 x 7. Modern Steinitz Defence (5.22 avg depth)
50 x 8. Old Steinitz Defence (5.10 avg depth)
45 x 9. Open (4.76 avg depth)
50 x 10. Schliemann Defence (5.00 avg depth)
442 x Reference Lines (29.37 avg depth)
