Old Indian Defense is a chess opening with the ECO code A53. It goes 1. d4 Nf6 2. c4 d6. White opens with 1. d4 (the queen's pawn) and Black answers 1... Nf6. After 4 moves it is White to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. d4 – White plays the pawn to d4
1... Nf6 – Black plays the knight to f6
2. c4 – White plays the pawn to c4
2... d6 – Black plays the pawn to d6
About the Old Indian Defense
Black plays ...d6, ...Nf6 and ...e5 against 1.d4, with the bishop on e7 instead of g7. It is solid but gives White more space.
Black builds with ...Nbd7, ...e5, ...Be7 and ...c6.
The e5 pawn is the key point; Black keeps it strong.
White usually gains space with e4 and d5, then attacks on the queenside.
chessGM