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Light or dark

A square is named with no board in sight: is it light or dark?

How it works

A square is named with no board in sight: say whether it is light or dark, as many as you can before the time runs out.

Time
A way to work it outNumber the files a to h as 1 to 8 and add the rank. An even total is a dark square, an odd one light: e4 is 5 + 4 = 9, light.