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Forsyth–Edwards Notation

Details

Forsyth–Edwards Notation (FEN) is a standard notation for describing a particular board position of a chess game.
The standard starting chess position is encoded as

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

The first space separated groups is the main part which encodes the physical positions of the pieces on the board.
Each rank (row) is described, starting with rank 8 and ending with rank 1; within each rank, the contents of each square are described from file (column) "a" through file "h". Each piece is identified by a single letter taken from the standard English names (Pawn, kNight, Bishop, Rook, Queen, King). White pieces are designated using upper-case letters ("PNBRQK") while black pieces use lowercase ("pnbrqk"). Empty squares are noted using digits 1 through 8 (the number of empty squares), and "/" separates ranks.

Given a FEN, output the board using the chess unicode characters and “ ” (U+3000 Ideographic Space) for empty squares. The output corresponding to the FEN of the starting position given above should be

♜♞♝♛♚♝♞♜
♟♟♟♟♟♟♟♟
        
        
        
        
♙♙♙♙♙♙♙♙
♖♘♗♕♔♗♘♖
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Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output.
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