# LeetCode 1812. Determine Color of a Chessboard Square

You are given `coordinates`, a string that represents the coordinates of a square of the chessboard. Below is a chessboard for your reference.

![](https://assets.leetcode.com/uploads/2021/02/19/screenshot-2021-02-20-at-22159-pm.png)

Return `true` *if the square is white, and* `false` *if the square is black*.

The coordinate will always represent a valid chessboard square. The coordinate will always have the letter first, and the number second.

**Example 1:**

```
Input: coordinates = "a1"
Output: false
Explanation: From the chessboard above, the square with coordinates "a1" is black, so return false.
```

**Example 2:**

```
Input: coordinates = "h3"
Output: true
Explanation: From the chessboard above, the square with coordinates "h3" is white, so return true.
```

**Example 3:**

```
Input: coordinates = "c7"
Output: false
```

**Constraints:**

* `coordinates.length == 2`
* `'a' <= coordinates[0] <= 'h'`
* `'1' <= coordinates[1] <= '8'`

## Solution

```
class Solution {
public:
    bool squareIsWhite(string coordinates) {
        return ((coordinates[0] - 'a') % 2) == ((coordinates[1] - '0') % 2);
    }
};
```