Little guide to write correct Shredder-FEN for Chess960 and beyond

The general format for initial positions:

********/pppppppp/8/8/8/8/PPPPPPPP/******** w **** - 0 1

Now U just should replace 8 stars with position's configuration (in small letters for black and capital letters for white) and 4 stars with letters of files where rooks are located (from right to left). The latter is necessary for correct castlings! For example, bbnnqrkr vs BBNNQRKR gives (rooks are located in f- and h-files)

bbnnqrkr/pppppppp/8/8/8/8/PPPPPPPP/BBNNQRKR w HFhf - 0 1

and it's done. Now U can copy/paste it in diagrams, Analysis Board or, maybe in a challenge that U wanna send to your friend.  This is a diagram made by copy/paste:

N.B.  Notice that in FEN white and black positions are not obliged to be symmetrical with respect to each other. It leads to 960x960 possible variations.

List of Shredder-FENs for Chess960 listed by bishop's positions + lexicographical order:

1. bbnnqrkr/pppppppp/8/8/8/8/PPPPPPPP/BBNNQRKR w HFhf - 0 1
   
2. bbnnrkqr/pppppppp/8/8/8/8/PPPPPPPP/BBNNRKQR w HEhe - 0 1
3. bbnnrkrq/pppppppp/8/8/8/8/PPPPPPPP/BBNNRKRQ w GEge - 0 1
4. bbnnrqkr/pppppppp/8/8/8/8/PPPPPPPP/BBNNRQKR w HEhe - 0 1
5. bbnqnrkr/pppppppp/8/8/8/8/PPPPPPPP/BBNQNRKR w HFhf - 0 1
6. bbnqrknr/pppppppp/8/8/8/8/PPPPPPPP/BBNQRKNR w HEhe - 0 1
7. bbnqrkrn/pppppppp/8/8/8/8/PPPPPPPP/BBNQRKRN w GEge - 0 1
8. bbnqrnkr/pppppppp/8/8/8/8/PPPPPPPP/BBNQRNKR w HEhe - 0 1
9. bbnrknqr/pppppppp/8/8/8/8/PPPPPPPP/BBNRKNQR w HDhd - 0 1
10. bbnrknrq/pppppppp/8/8/8/8/PPPPPPPP/BBNRKNRQ w GDgd - 0 1
11. bbnrkqnr/pppppppp/8/8/8/8/PPPPPPPP/BBNRKQNR w HDhd - 0 1
12. bbnrkqrn/pppppppp/8/8/8/8/PPPPPPPP/BBNRKQRN w GDgd - 0 1
    
13. bbnrkrnq/pppppppp/8/8/8/8/PPPPPPPP/BBNRKRNQ w FDfd - 0 1
14. bbnrkrqn/pppppppp/8/8/8/8/PPPPPPPP/BBNRKRQN w FDfd - 0 1
15. bbnrnkqr/pppppppp/8/8/8/8/PPPPPPPP/BBNRNKQR w HDhd - 0 1

(to be continued)

I use these FENs for my test games:

https://www.chess.com/forum/view/chess960-chess-variants/list-of-all-960-fischer-s-positions-evaluations-and-best-moves

Current status: FEN for 5 initial positions.

Thanks Yidor

Current status: FEN for 7 initial positions.

U are welcome, my friend Yuree. 

List of all normal FENs ( it now works with Stockfish 😎 ):

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