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 Nc6 3.d4 exd4 4.Nxd4 Nf6
15 decisions · 3 rounds of 5
Chapter 2
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5
14 decisions · 3 rounds of 5
Chapter 3
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qf6
10 decisions · 2 rounds of 5