Pawns move diagonally towards the middle of the board until they are in the middle part or in the corners of the opponents side of the board. It is allowed to move two squares if the deflection line isn't passed with the first move of the pawn. So, for instance, the white pawn on a4 can move only to b5, but the white pawn on c3 can move to d4 or to e5. When the pawn is in the middle part or the 4 by 4 corners at the opponents side of the board, then it may move one square in an arbitrary direction. When a pawn is moved back to a corner of the owning players side of the board, it can only move diagonally forward again.
Pawns only can take in the move after they have crossed a deflection line.
The opponent must defend the king, if possible. Otherwise, the player takes the king of the opponent. One wins the game by taking both kings of the opponent. When only two kings of different players are left on the board, the game is a draw. The rules in my books were somewhat open for different interpretations, so the description above may contain errors.