print board[2][3]
the example above prints out "O",the element in the 3rd row and 4th column.
set the list element at guess_row,guess_col to "X"
board[guess_row][guess_col] = "X"
print board[2][3]
the example above prints out "O",the element in the 3rd row and 4th column.
set the list element at guess_row,guess_col to "X"
board[guess_row][guess_col] = "X"