May 10, 2022 - Reading time: 3 minutes
Style 12 is a type of machine parseable output that many of the FICS interfaces use. The output is documented here for those who wish to write new interfaces. Style 12 is also fully compatible with ICC (The Internet Chess Club).
The data is all on one line (displayed here as two lines, so it will show on your screen). Here is an example: [Note: the beginning and ending quotation marks are not part of the data string; they are needed in this help file because some interfaces cannot display the string when in a text file.]
<12> rnbqkb-r pppppppp -----n-- -------- ----P--- -------- PPPPKPPP RNBQ-BNR B -1 0 0 1 1 0 7 Newton Einstein 1 2 12 39 39 119 122 2 K/e1-e2 (0:06) Ke2 0
This string always begins on a new line, and there are always exactly 31 non- empty fields separated by blanks. The fields are:
the string “<12>” to identify this line.
eight fields representing the board position. The first one is White’s 8th rank (also Black’s 1st rank), then
White’s 7th rank (also Black’s 2nd), etc, regardless of who’s move it is.
color whose turn it is to move (“B” or “W”)
-1 if the previous move was NOT a double pawn push, otherwise the chess board file (numbered 0–7 for a–h) in which the double push was made
can White still castle short? (0=no, 1=yes)
can White still castle long?
can Black still castle short?
can Black still castle long?
the number of moves made since the last irreversible move. (0 if last move was irreversible. If the value is >= 100, the game can be declared a draw due to the 50 move rule.)
The game number
my relation to this game: -3 isolated position, such as for “ref 3” or the “sposition” command -2 I am observing game being examined 2 I am the examiner of this game -1 I am playing, it is my opponent’s move 1 I am playing and it is my move 0 I am observing a game being played
initial time (in seconds) of the match
increment In seconds) of the match
White material strength
Black material strength
White’s remaining time
Black’s remaining time
the number of the move about to be made (standard chess numbering – White’s and Black’s first moves are both 1, etc.)
verbose coordinate notation for the previous move (“none” if there were none) [note this used to be broken for examined games]
time taken to make previous move “(min:sec)”.
pretty notation for the previous move (“none” if there is none)
flip field for board orientation: 1 = Black at bottom, 0 = White at bottom.
In the future, new fields may be added to the end of the data string, so programs should parse from left to right.
When showing positions from bughouse games, a second line showing piece holding is given, with
<b1> game 6 white [PNBBB] black [PNB]
Also, when pieces are “passed” during bughouse, a short data string – not the entire board position – is sent. For example:
<b1> game 52 white [NB] black [N] <- BN
The final two letters indicate the piece that was passed; in the above example, a knight (N) was passed to Black.
A prompt may preceed the