One point is added if two letters match, and one point is subtracted if they do not. Using a value from either the upper (green) or left (dark blue) square, the final score is -2; however, using the ...
Back in the good old days, so many things were easier to understand. I once disassembled the engine of my 1972 MG just to see how it worked, but now I won't touch the squirrel's nest of technology ...