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    this is a duplicate issue, please read the existing issues before opening a new one. i do not know Haskell so I cannot fix it

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    In instructions it's said that "there will always be exactly one king". I coded assuming that was true and was hit by an exception on a (Haskell) random test case that has no king:

     King should not be in check:
  |---|---|---|---|---|---|---|---|
  |   |   |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   | ♟ |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   |   |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   | ♞ |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   |   | ♜ |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   |   |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   |   |   |   |   |   |   |   |
  |---|---|---|---|---|---|---|---|
  |   |   |   |   | ♝ |   |   |   |
  |---|---|---|---|---|---|---|---|

    I assume this is a bug. If it's not, you should clarify in the instructions that "there will always be at most one king".