struct

Experion::Position

Inherits Experion::Moves < Struct < Value < Object

Constructors

new(fen : String)
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startpos
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Instance methods

attacked_by?(sq : Int, by : Int, occ : UInt64) : Bool

Is sq attacked by any piece of color by given occupancy occ?

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attackers_to(sq : Int, occ : UInt64, by : Int) : UInt64

Bitboard of all pieces of color by attacking sq given occupancy occ.

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castling
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find_legal_uci(u : String) : UInt16 | Nil

Find a legal move matching a UCI string (e.g. "e2e4", "e7e8q").

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fullmove
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generate(out_ptr : Pointer(UInt16)) : Int32
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generate_captures(out_ptr : Pointer(UInt16)) : Int32
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halfmove
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hash

Generates an UInt64 hash value for this object.

This method must have the property that a == b implies a.hash == b.hash.

The hash value is used along with == by the Hash class to determine if two objects reference the same hash key.

Subclasses must not override this method. Instead, they must define hash(hasher), though usually the macro def_hash can be used to generate this method.

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hash_after(m : UInt16) : UInt64

Zobrist key of self after m, without copying the position. Used to probe the child's TT slot for move ordering.

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in_check?(color : Int = @stm) : Bool
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king_sq(color : Int) : Int32
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make_move(m : UInt16, upd_hash : Bool = true) : Nil

Mutates self. Callers must copy first: child = parent; child.make_move(m).

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make_null_move(upd_hash : Bool = true) : Nil

Null move (for search): pass the turn, clear ep.

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occ_all
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occ_of(color : Int) : UInt64
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phase
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piece_at(sq : Int) : UInt8
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pieces(pc : Int) : UInt64
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pieces_of(color : Int, ptype : Int) : UInt64
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pretty
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to_fen
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Macros

define_gen(fname, caps_only)
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emit(mv)

emits one move + bump count

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emit_promos(from_sq, to_sq)

emits all four promotions from -> to

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