Move Representation

Each potential move is stored in a 32 bit integer

The move integer is a member of a structure. Members of the structure are :

• move – a 32 bit integer representing the move.
• score – an integer used for MVV/LVA move ordering.
• quiet – a bool that indicates whether the move is a quiet move.

Byte from	Byte To	Represents	How to query
1	7	Square From	move & 0x7F
8	14	Square To	((move >>7) & 0x7F)
15	18	Castling	((move >> 14) & 0x0F)
19	22	Captured Piece	((move >> 18) & 0xF)
23	26	Promoted Piece	((move >> 22) & 0xF)
27	27	En Passant Flag	(1u & (move >> 26))

See also:

Piece Representation

Castling Representation