Pick anything and be asked it cold, whether or not you owe it. Nothing here is unlocked by anything else.
Chapter 1
1.e4 e5 2.Nf3
200 decisions · 40 rounds of 5
White plays 3.Bb5
43 decisions · 9 rounds of 5
White plays 3.Bc4
75 decisions · 15 rounds of 5
White plays 3.d4
42 decisions · 9 rounds of 5
White plays 3.Nc3
46 decisions · 10 rounds of 5
Chapter 2
1.e4 e5 2.Nc3
61 decisions · 13 rounds of 5
16 decisions · 4 rounds of 5
White plays 3.Nf3
1 decision · 1 round of 5
White plays 3.f4
White plays 3.g3
10 decisions · 2 rounds of 5
17 decisions · 4 rounds of 5