Project Euler #11: Python solution not working

Question

What is the greatest product of four adjacent numbers in any direction (up, down, left, right, or diagonally) in the 20×20 grid?

http://projecteuler.net/problem=11

I have created two dimensional tuple, LIST from the numbers.

LIST = ((8, 2, 22, ....), (49, 49, 99, ....) ...)

Here is my solution. I am not able to figure out the logical flaw.

(Edit) : My answer is 51267216 but not correct.

# For every number check diagnolly, down and right if the product exceeds max_product. 
# Ignore the exception(OutOfBounds) if encountered.
max_product = 0

for i in range(20):
    for j in range(20):
            temp = 1
            try: 
                for k in range(4):
                    temp = temp * LIST[i][j+k]
                if (temp > max_product):
                    max_product = temp
            except:
                pass

            temp = 1
            try: 
                for k in range(4):
                    temp = temp * LIST[i+k][j]
                if (temp > max_product):
                    max_product = temp
            except:
                pass

            temp = 1
            try:
                for k in range(4):
                    temp = temp * LIST[i+k][j+k]
                if (temp > max_product):
                    max_product = temp
            except:
                pass


print max_product

Answer 1

您也许忘记了两个对角线方向吗？