1 x Introduction (2.00 avg depth)
4 x 2...Nf6, Classical with ...e6 or ...Ne4?! (9.75 avg depth)
6 x 2...Nf6, Stonewall with ...d5 (14.33 avg depth)
3 x 2...g6, Leningrad (7.67 avg depth)
11 x 2...d5 with 3...Nf6 (13.55 avg depth)
6 x 2...d5 with 3...a6/c6 (12.17 avg depth)
2 x Transpo Tricks: 1...e6 (8.50 avg depth)