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Explore an infinite tree of moves with official ECO codes.
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1. e4 c5
1. e4 e5 2. Nf3 Nc6 3. Bb5
1. d4 d5 2. c4
1. e4 c6
1. d4 Nf6 2. c4 g6
1. e4 e5 2. Nf3 Nc6 3. Bc4
1. e4 e6
1. c4
