BishBosh.Input.SearchOptions

AUTHOR

Dr. Alistair Ward

DESCRIPTION

Defines configurable options related to the process of searching for the optimal move.

Types

Type-synonyms

type SortOnStandardOpeningMoveFrequency = Bool

Sort moves on the decreasing frequency of occurrence in standard openings.

type HammingDistance = Int

The optional minimum Hamming-distance between the random numbers from which Zobrist-hashes are composed.

type MaybeRetireAfterNMoves = Maybe NMoves

The number of full moves (one for each player) after which to retire killer moves.

type TrapRepeatedPositions = Bool

Whether to short-circuit the fitness-evaluation of positions which have been visited before in the current game.

type MaybeUseTranspositions = Maybe (NMoves, NPlies)

The number of full moves (one for each player) after which to retire transpositions & the search-depth beneath which they aren't recorded at all.

type Reader = Reader SearchOptions

Self-documentation.

Data-types

data SearchOptions

Defines options related to searching for a move.

Instances

Eq SearchOptions

Defined in BishBosh.Input.SearchOptions

Methods

(==) :: SearchOptions -> SearchOptions -> Bool

(/=) :: SearchOptions -> SearchOptions -> Bool

Show SearchOptions

Defined in BishBosh.Input.SearchOptions

Methods

showsPrec :: Int -> SearchOptions -> ShowS

show :: SearchOptions -> String

showList :: [SearchOptions] -> ShowS

Default SearchOptions

Defined in BishBosh.Input.SearchOptions

Methods

def :: SearchOptions

NFData SearchOptions

Defined in BishBosh.Input.SearchOptions

Methods

rnf :: SearchOptions -> ()

XmlPickler SearchOptions

Defined in BishBosh.Input.SearchOptions

Methods

xpickle :: PU SearchOptions

Constants

tag :: String

Used to qualify XML.

sortOnStandardOpeningMoveFrequencyTag :: String

Used to qualify XML.

searchDepthTag :: String

Used to qualify XML.

minimumSearchDepth :: NPlies

The constant minimum permissible search-depth.

defaultSearchDepth :: NPlies

• The constant default search-depth.
• CAVEAT: this is rather arbitrary.

Functions

Constructor

mkSearchOptions

Arguments

:: SortOnStandardOpeningMoveFrequency

-> Maybe CaptureMoveSortAlgorithm

-> Maybe HammingDistance

The optional lower bound on the Hamming-distance between the random numbers used to compose Zobrist hashes from positions.

-> MaybeRetireAfterNMoves

The number of full moves back from the current position, after which to retire killer-moves.

-> TrapRepeatedPositions

-> UsePondering

-> MaybeUseTranspositions

The number of full moves after which to retire transpositions, & the search-depth beneath which transpositions aren't recorded.

-> StandardOpeningOptions

-> SearchDepthByLogicalColour

-> SearchOptions

Smart constructor.

Accessors

getSearchDepth :: SearchOptions -> NPlies

Get either player's search-depth, using a default value when none are defined.

maybeRetireTranspositionsAfter :: SearchOptions -> MaybeRetireAfterNMoves

When to retire transpositions.

maybeMinimumTranspositionSearchDepth :: SearchOptions -> Maybe NPlies

The search-depth beneath which transpositions aren't recorded.

identifyAutomatedPlayers :: SearchOptions -> [LogicalColour]

Extract those logical colours for which a search-depth has been defined, which implies that the corresponding player is automated.

Mutators

setSearchDepth :: NPlies -> Transformation

Mutator.

swapSearchDepth :: Transformation

Swap the logical colour associated with any searchDepth currently assigned.

Predicates

recordKillerMoves :: SearchOptions -> RecordKillerMoves

Whether killer-moves are to be recorded.