Notation and standards
Position encoding
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Forsyth notation
Level: IntermediateA compact system created to record the placement of pieces in a chess position.
Forsyth-Edwards Notation
Level: BasicA six-field text line that lets software or a person reconstruct the state of a chess position.
En passant target square
Level: AdvancedThe empty square recorded after a two-square pawn advance to represent a possible en passant capture.
Extended Position Description
Level: BasicA one-line format that describes a position and can attach structured operations for chess software.
EPD operation
Level: AdvancedA data unit appended to an EPD position using an operation name, optional values, and a final semicolon.
GBR code
Level: AdvancedA numeric code summarizing the material in a position without showing where the pieces stand.
Chess960 numbering scheme
Level: AdvancedA system that consistently assigns a number from 0 to 959 to every legal Chess960 starting position.
Shredder-FEN
Level: AdvancedA FEN extension identifying Chess960 castling rights through letters for the eligible rooks' starting board columns.
X-FEN
Level: AdvancedAn extension of FEN that accurately represents Chess960 positions and castling rights.