The rules of Anti Line4 are the same as for normal Line4 with the following differences:
The player who places four or more pieces in a solid row vertically, horizontally or diagonally, loses the game.
If the whole game board is full and no player placed four pieces in a solid row, the white player wins.
It is not allowed to place a piece over the opponent's piece placed at the previous move (except a situation where only one empty column remains). The restriction (for this piece) is not applied at the next moves.