problem_267.js

// This problem was asked by Oracle.

// You are presented with an `8` by `8` matrix representing the positions of pieces on a chess board. The only pieces on the board are the black king and various white pieces. Given this matrix, determine whether the king is in check.

// For details on how each piece moves, see here.

// For example, given the following matrix:

// ```
// ...K....
// ........
// .B......
// ......P.
// .......R
// ..N.....
// ........
// .....Q..
// ```

// You should return `True`, since the bishop is attacking the king diagonally.