Formation (진형)
한국어The Formation family holds 2 lines. The boards below follow its shortest line from the first move.
The Korean name in brackets is ours, not an official translation. The original name is English.
Main line
1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
One move per board, left to right. The two outlined squares are the move just played.
Drawn to move 8 of 13. The rest is written out below.
Play it yourself
Formation (A00)
1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
Tap a piece and then the square it goes to. When the move matches the data, the reply follows on its own.
Your move.0 of 13 moves played.
0 lines marked as played in this browser.
Lines you finish are written in this browser only. Nothing goes to the server.
ECO codes here
Variations in this family
Ordered by ECO code. A blank label means the entry carries the family name alone.
A00Hippopotamus Attack13 movesPlay this line
1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
A00Shy Attack13 movesPlay this line
1. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O 7. h3
Other families of similar size
Data collected on 2026-09-07. The original is published as a public domain data set.