Python language function to convert a chess file in PGN notation to a file of FEN strings
Here's a basic PGN file (saved as euwe_colle_karlsbad_1929.pgn):
[Event "Karlsbad"] [Site "Karlsbad CSR"] [Date "1929.08.18"] [Round "15"] [White "Max Euwe"] [Black "Edgar Colle"] [Result "1-0"] 1.Nf3 Nf6 2.d4 e6 3.c4 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Nbxd2 d6 8.O-O O-O 9.Re1 Nbd7 10.Qc2 e5 11.Nxe5 Bxg2 12.Nxd7 Bh3 13.Nxf8 1-0
Example calling code:
source_pgn = ".\\Data\\euwe_colle_karlsbad_1929.pgn"
dest_fen = ".\\Data\\euwe_colle_karlsbad_1929.fen"
print("Converting file " + source_pgn + " to FEN strings ")
ChessFunctions.file_pgn_to_file_fen(source_pgn, dest_fen)
print("Done ")
The resulting euwe_colle_karlsbad_1929.fen file contains:
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 rnbqkbnr/pppppppp/8/8/8/5N2/PPPPPPPP/RNBQKB1R b KQkq - 1 1 rnbqkb1r/pppppppp/5n2/8/8/5N2/PPPPPPPP/RNBQKB1R w KQkq - 2 2 rnbqkb1r/pppppppp/5n2/8/3P4/5N2/PPP1PPPP/RNBQKB1R b KQkq d3 0 2 rnbqkb1r/pppp1ppp/4pn2/8/3P4/5N2/PPP1PPPP/RNBQKB1R w KQkq - 0 3 rnbqkb1r/pppp1ppp/4pn2/8/2PP4/5N2/PP2PPPP/RNBQKB1R b KQkq c3 0 3 rnbqkb1r/p1pp1ppp/1p2pn2/8/2PP4/5N2/PP2PPPP/RNBQKB1R w KQkq - 0 4 rnbqkb1r/p1pp1ppp/1p2pn2/8/2PP4/5NP1/PP2PP1P/RNBQKB1R b KQkq - 0 4 rn1qkb1r/pbpp1ppp/1p2pn2/8/2PP4/5NP1/PP2PP1P/RNBQKB1R w KQkq - 1 5 rn1qkb1r/pbpp1ppp/1p2pn2/8/2PP4/5NP1/PP2PPBP/RNBQK2R b KQkq - 2 5 rn1qk2r/pbpp1ppp/1p2pn2/8/1bPP4/5NP1/PP2PPBP/RNBQK2R w KQkq - 3 6 rn1qk2r/pbpp1ppp/1p2pn2/8/1bPP4/5NP1/PP1BPPBP/RN1QK2R b KQkq - 4 6 rn1qk2r/pbpp1ppp/1p2pn2/8/2PP4/5NP1/PP1bPPBP/RN1QK2R w KQkq - 0 7 rn1qk2r/pbpp1ppp/1p2pn2/8/2PP4/5NP1/PP1NPPBP/R2QK2R b KQkq - 0 7 rn1qk2r/pbp2ppp/1p1ppn2/8/2PP4/5NP1/PP1NPPBP/R2QK2R w KQkq - 0 8 rn1qk2r/pbp2ppp/1p1ppn2/8/2PP4/5NP1/PP1NPPBP/R2Q1RK1 b kq - 1 8 rn1q1rk1/pbp2ppp/1p1ppn2/8/2PP4/5NP1/PP1NPPBP/R2Q1RK1 w - - 2 9 rn1q1rk1/pbp2ppp/1p1ppn2/8/2PP4/5NP1/PP1NPPBP/R2QR1K1 b - - 3 9 r2q1rk1/pbpn1ppp/1p1ppn2/8/2PP4/5NP1/PP1NPPBP/R2QR1K1 w - - 4 10 r2q1rk1/pbpn1ppp/1p1ppn2/8/2PP4/5NP1/PPQNPPBP/R3R1K1 b - - 5 10 r2q1rk1/pbpn1ppp/1p1p1n2/4p3/2PP4/5NP1/PPQNPPBP/R3R1K1 w - - 0 11 r2q1rk1/pbpn1ppp/1p1p1n2/4N3/2PP4/6P1/PPQNPPBP/R3R1K1 b - - 0 11 r2q1rk1/p1pn1ppp/1p1p1n2/4N3/2PP4/6P1/PPQNPPbP/R3R1K1 w - - 0 12 r2q1rk1/p1pN1ppp/1p1p1n2/8/2PP4/6P1/PPQNPPbP/R3R1K1 b - - 0 12 r2q1rk1/p1pN1ppp/1p1p1n2/8/2PP4/6Pb/PPQNPP1P/R3R1K1 w - - 1 13 r2q1Nk1/p1p2ppp/1p1p1n2/8/2PP4/6Pb/PPQNPP1P/R3R1K1 b - - 0 13
The Wikipedia entries on PGN and FEN are quite good:
https://en.wikipedia.org/wiki/Portable_Game_Notation https://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation
The FEN format is so simple there is no specification document. The PGN specification is at:
http://www.saremba.de/chessgml/standards/pgn/pgn-complete.htm