Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7 and two chess knights. All knights defend at least one other.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7 and two chess knights. All knights defend at least one other.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess knight. All knights defend at least one other.