Quickstarter (45 variations, 14.2 avg. trainable depth)

1. Early Gambits And Attacks (96 variations, 10.8 avg. trainable depth)

2. Bishop’s Opening, Vienna (68 variations, 9.1 avg. trainable depth)

3. Petroff Sidelines and Four Knights (63 variations, 11.7 avg. trainable depth)

4. Scotch and Spanish Four Knights (77 variations, 12.0 avg. trainable depth)

5. Petroff with 3. d4 Sidelines (70 variations, 12.3 avg. trainable depth)

6. Petroff with 3. d4 Main Line (71 variations, 18.1 avg. trainable depth)

7. Petroff with 3. Nxe5 Sidelines (53 variations, 11.3 avg. trainable depth)

8. Petroff with 3. Nxe5 Main Line (92 variations, 17.6 avg. trainable depth)

9. (Alternative) Petroff Modern Main Line (85 variations, 13.8 avg. trainable depth)

10. Petroff Modern Main Line with …O-O (41 variations, 17.7 avg. trainable depth)