Old Indian - main line
1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 Nbd7 5. e4
White pushes the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.
Black plays the queen's pawn to d6. White develops the knight to c3. Black plays the king's pawn to e5.
White jumps the knight to f3. Black transfers the knight to d7. White plays the king's pawn to e4.