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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Generate-Chess960-starting-position/Haskell/generate-chess960-starting-position.hs Normal file
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import Data.List
import qualified Data.Set as Set
data Piece = K | Q | R | B | N deriving (Eq, Ord, Show)
isChess960 :: [Piece] -> Bool
isChess960 rank =
(odd . sum $ findIndices (== B) rank) && king > rookA && king < rookB
where
Just king = findIndex (== K) rank
[rookA, rookB] = findIndices (== R) rank
main :: IO ()
main = mapM_ (putStrLn . concatMap show) . Set.toList . Set.fromList
. filter isChess960 $ permutations [R,N,B,Q,K,B,N,R]