Board 1 has 6 safe squares.
Board 2 has 0 safe squares.
Board 3 has 2 safe squares.
Board 4 has 0 safe squares.
Board 5 has 16 safe squares.
Board 6 has 0 safe squares.
Board 7 has 2 safe squares.
Board 8 has 5988 safe squares.
Board 9 has 1000000 safe squares.
Board 10 has 989856 safe squares.
Board 11 has 731193 safe squares.
Board 12 has 6733 safe squares.
Board 13 has 27910 safe squares.