Check if Two Chessboard Squares Have the Same Color

class Solution {
public:
    bool squareIsWhite(string coordinate) {
        int col = coordinate[0] - 'a';
        int row = coordinate[1] - '1';
        return (col + row) % 2 == 1;
    }

    bool checkTwoChessboards(string coordinate1, string coordinate2) {
        return squareIsWhite(coordinate1) == squareIsWhite(coordinate2);
    }
};