BishBosh.Component.Zobrist

AUTHOR

Dr. Alistair Ward

DESCRIPTION

• https://www.chessprogramming.org/Zobrist_Hashing.
• Defines the random-numbers required to construct a hash of a chess-position.
• Facilitates the construction of a hash from arbitrary data.

Types

Type-synonyms

Data-types

data Zobrist positionHash

The random numbers used to generate a hash, which almost uniquely represent a position.

Instances

Foldable Zobrist

Defined in BishBosh.Component.Zobrist

Methods

fold :: Monoid m => Zobrist m -> m

foldMap :: Monoid m => (a -> m) -> Zobrist a -> m

foldMap' :: Monoid m => (a -> m) -> Zobrist a -> m

foldr :: (a -> b -> b) -> b -> Zobrist a -> b

foldr' :: (a -> b -> b) -> b -> Zobrist a -> b

foldl :: (b -> a -> b) -> b -> Zobrist a -> b

foldl' :: (b -> a -> b) -> b -> Zobrist a -> b

foldr1 :: (a -> a -> a) -> Zobrist a -> a

foldl1 :: (a -> a -> a) -> Zobrist a -> a

toList :: Zobrist a -> [a]

null :: Zobrist a -> Bool

length :: Zobrist a -> Int

elem :: Eq a => a -> Zobrist a -> Bool

maximum :: Ord a => Zobrist a -> a

minimum :: Ord a => Zobrist a -> a

sum :: Num a => Zobrist a -> a

product :: Num a => Zobrist a -> a

Show positionHash => Show (Zobrist positionHash)

Defined in BishBosh.Component.Zobrist

Methods

showsPrec :: Int -> Zobrist positionHash -> ShowS

show :: Zobrist positionHash -> String

showList :: [Zobrist positionHash] -> ShowS

(FiniteBits positionHash, Random positionHash) => Default (Zobrist positionHash)

Defined in BishBosh.Component.Zobrist

Methods

def :: Zobrist positionHash

Functions

dereferenceRandomByCoordinatesByRankByLogicalColour :: Zobrist positionHash -> Index -> positionHash

Dereferences getRandomByCoordinatesByRankByLogicalColour using the specified index.

dereferenceRandomByCastleableRooksXByLogicalColour

Arguments

:: Zobrist positionHash

-> LogicalColour

-> X

-> Maybe positionHash

The existence of a result depends on whether there remain any Rooks which can castle.

Dereferences getRandomByCastleableRooksXByLogicalColour using the specified abscissa.

dereferenceRandomByEnPassantAbscissa :: Zobrist positionHash -> X -> positionHash

Dereferences getRandomByEnPassantAbscissa using the specified abscissa.

Constructors

mkZobrist

Arguments

:: (FiniteBits positionHash, RandomGen randomGen, Random positionHash)

=> Maybe Int

The optional minimum acceptable Hamming-distance between any two of the selected random numbers.

-> randomGen

-> Zobrist positionHash

Smart constructor.