Help:Diagrams

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To include a chess diagram on a Retro Wiki page, there is no need to create the diagram offline and upload it as a graphic file. Instead, diagrams are created on the fly out of a "Fairy FEN".

Fairy FEN is an extension to the usual FEN notation. Additionally to the traditional chess pieces, Fairy FEN supports pieces and markers used in fairy chess.

Normal chess pieces, e.g.:

Image:bk.gif Image:bq.gif Image:br.gif Image:bb.gif Image:bn.gif Image:bp.gif Image:wk.gif Image:wq.gif Image:wr.gif Image:wb.gif Image:wn.gif Image:wp.gif

Fairy pieces, i.e. normal chess symbols rotated by 90°, 180° or 270°, e.g.:

Image:br.gif Image:rbn.gif Image:rbq.gif Image:rbb.gif

Neutral pieces, which are neither black nor white, e.g.:

Image:nk.gif Image:nq.gif Image:nr.gif Image:nb.gif Image:nn.gif Image:np.gif

Markers of different shapes in white and black:

Image:wc.gif Image:bc.gif Image:wx.gif Image:bx.gif Image:ws.gif Image:bs.gif Image:wt.gif Image:bt.gif

Upper case letters (A to Z), lower case letters (a to z) and numbers (0 to 99):

Image:da.gif Image:db.gif Image:dc.gif Image:ca.gif Image:cb.gif Image:cc.gif Image:00.gif Image:01.gif Image:02.gif Image:13.gif Image:32.gif

With Fairy FEN is is possible to specify most (if not any) fairy chess problem.

Fairy FEN Specification

The following specification assumes that the reader is familiar with the traditional FEN notation. A complete specification if traditional FEN can be found ***HERE***

• A chess diagram is specified by a sequence of letters an digits, row by row and column by column, starting in the upper left corner. The rows are separated by "/" signs:</p> 

 row8/row7/row6/row5/row4/row3/row2/row1

Note that FFEN supports also larger and smaller chess boards, i.e. a chess board can have the dimensions 4x4 or 11x11, for example.

• Chess pieces are denoted by the letters K (King), Q (Queen), R (Rook), B (Bishop), N (kNight) and P (Pawn); lower case letters denote black pieces; upper case letters denote white pieces; a sequence of empty squares is denoted by a one-digit number specifying the length of the sequence. The starting position is thus specified by: 

 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR

• A marker is specified by the letters C (circle), X (cross), S (square) and T (triangle); lower case letters denote black markers; upper case letters denote white markers. Technically, there is no difference between normal pieces and markers.

• A neutral piece or a neutral marker is denoted by prefixing a piece or marker symbol with a "-" sign, e.g. -B or -b denotes a neutral Bishop. There is no difference between upper and lower case letters.

• A rotated piece or marker is denoted by prefixing a piece or marker symbol by a »*« sign, followed by a one-digit number specifying how often the piece should be rotated clockwise in 90° steps. For example, »*1B« denotes white Bishop rotated by 90°, »*3q« denotes a black Queen rotated by 270°, and »-*2r« denotes a neutral rook rotated by 180°.

• A letter is denoted by prefixing it by a »'« sign, e.g. 'a or 'A. There are black lower case letters and black upper case letters, but no white or neutral letters. Letters can be rotated.

• A number is denoted by prefixing it by one »'« sign (one-digit number) or two »'« signs (two digit number), e.g. »'7« or »''23«. Note that »'2'3« and »"23« are different: »'2'3« denote two squares with the numbers 2 and 3 respectively; »''23« denotes a single square with the number 23. There are black numbers only, no white or neutral numbers. Numbers can be rotated.

Note: Why are two »'« necessary? To avoid ambiguity: »'32« is a square with the number 3 followed by 2 empty squares, while »''32« is a square with the number 32. unfortunately, »"«  cannot be used to denote two-digit numbers because »"« is a HTML delimiter.

Caution: Two digit numbers do not work yet, the double »''« are wrongly interpreted by the Wiki software.

How to use

Embed an image in the Wiki page as follows: 

 http://retrowiki.janko.at/d.php?
 fen=rnbqkbnr/p*1p*2p*3pp*1p*2p*3p/'a'b'c'd'w'x'y'z/
 -p-P-r-R-n-N-b-B/cCsSxXtT/'A'B'C'D'W'X'Y'Z/
 '0'1'2'3'4'1'2'3/RNBQKBNR.png

Please pay attention to the ".png" suffix - this is needed for technical reasons (otherwise the Wiki software would not accept the URL as image).

The result is the following diagram:

RNBQKBNR.png

Some real-life examples

0000 - Initial Position
FIDE Rules

RNBQKBNR.png 

 http://retrowiki.janko.at/d.php?
 fen=rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR.png


F307 - Reto Aschwanden
Probleemblad 2, Mar/Apr 2002

6*3rbN.png

Mate in 3 moves 

 http://retrowiki.janko.at/d.php?
 fen=3*2r3*3N3/*3n6*2r3/*3N*2bp3*2bQ3/2*2b*2r3p3/
 1*2r2P1p4/4N4p1/1K*3n5p2/3*3Np1B1P2/3pN1p4/
 3B*2rkb2*3nR/6*3rbN.png


3874 - Jean-Michel Trillon
diagrammes 123, 10/1997

8.png

Ortho-reconstruction in 25.0 moves (white starts) 

 http://retrowiki.janko.at/d.php?
 fen=k1B5/-p1PP4/K1-p5/p1-p5/p7/2p1-p3/4P3/8.png


G161 - Petko Petkov
feenschach 1993, Prix spécial
FIDE Album 1992-1994

*2q2KB3.png

Mate in 2 moves (Circe) 

 http://retrowiki.janko.at/d.php?
 fen=4n3/1-*2q2b-qp-*2n/4p-*2qp1/2*2q1pkp-r/
 4pP*2q1/1p2P2p/1-*2q6/*2q2KB3.png


G148 - T. Wakashima
Phénix 1993, 2e Prix
FIDE Album 1992-1994

8.png

ser-s#11 (2 solutions) 

 http://retrowiki.janko.at/d.php?
 fen=8/1Q6/4c3/4cc2/8/8/6K1/8.png


G106 - Thomas Maeder
feenschach 1987, 2nd prize
Fide Album 1986-1988

8.png

(a) diagram (b) wK->g5 (c) Ie5->c5 (d) Ie5->a7 (Imitator e5) 

 http://retrowiki.janko.at/d.php?
 fen=8/1P6/1k6/4cK2/8/8/8/8.png
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