How to identify if it is a light square or a dark square. It is actually quite simpler than some people think there is a formula from which you can figure out if the square is light or dark.
The formula that you need is to check if the number is even or odd, a = 1
B=2 C = 3 and so on.. If you need to to find for example a3 you will do (1+3) since 4 is divisible by 2 it is a dark square, for a4 (1+4) since 5 is not directly divisible by 2 it is a light square