Formation — opening family
2 catalogued lines · ECO A00–A00
The shortest catalogued line of the family runs 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3 — the position below. The continuation chips count how many catalogued lines extend this head with each next move; explore the full tree below and play any branch against the engine.
Variations tree of the Formation family
Click any move to jump to that position; switch branches at any point with the alternative moves. Test your knowledge plays the shown position against the engine.
Start
All 2 lines
| Name | ECO | Main line length |
|---|---|---|
| Formation: Hippopotamus Attack | A00 | 13 plies |
| Formation: Shy Attack | A00 | 13 plies |