chessBoardCellColor

My solution:

bool chessBoardCellColor(string cell1, string cell2) 
{
    return (cell1[0] - 'A' % 2 + cell1[1] - '1' % 2) % 2 == (cell2[0] - 'A' % 2 + cell2[1] - '1' % 2) % 2;
}

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