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Plan 9 - man page for chdb (plan9 section 7)

CHDB(7) 			 Miscellaneous Information Manual			  CHDB(7)

NAME
       chdb - chess database browser

SYNOPSIS
       chdb [ file ...	]

DESCRIPTION
       Chdb  reads  the  given	files  of  chess  games (hist by default) and accepts commands to
       search, play through, and display the games in these files.  If x is the name of the file,
       it is looked for under the names x, x.m.out, and /lib/chess/x.m.out.

       After  reading  the files, chdb displays a chess board, a text window with a command line,
       and vertical and horizontal scroll bars along the edges of the  board.	The  text  window
       holds  6  lines	of  information about the game and position and, at the bottom, a command
       line in which to type.  The displayed text contains chess symbols--use a suitable font.

       The vertical scroll bar scans through the games to select a game; the horizontal bar  then
       scans through the moves of the selected game.  Both scroll bars use button 1 to scan back-
       wards, button 3 to scan forwards, and button 2 to jump to an absolute position.	With but-
       tons  1 and 3, the scroll bars are calibrated in units of 1 through 8 corresponding to the
       ranks and files of the board.  The units measure games on the  vertical	scroll	bar,  ply
       (half-moves) on the horizontal scroll bar.  For example, clicking button 3 on the horizon-
       tal scroll bar under the d file steps through the game two full moves.

       Moves may be made on the chess board by pointing with button 1.	There are two methods  to
       point  at  moves.   For	the first method, point at the piece to be moved, press button 1,
       point to the place to move that piece, and release button 1.  In the second method,  point
       at  the	place  where  a  piece is to move and press button 1.  The smallest/least-central
       piece that can move there is highlighted.  Releasing button 1  without  moving  the  mouse
       will  make  the highlighted move.  Moving the mouse to the desired piece and releasing the
       button will move the selected piece.

       Typed lines of text are echoed in the command line and executed.  The  available  commands
       are:

       f n n  Set  the	format	for display of moves in the text window.  The first number is the
	      verbosity, with 0 minimal.  The second number is 0 for algebraic,  1  for  English,
	      and 2 for figurine (default).

       g n    Go to the game with ordinal number n in the input files.	If n is prefixed with a +
	      or -, it is interpreted as a relative position in the current  set  of  games  (see
	      below).  N defaults to +1.

       p n    Go  to  whole  move  n  in the current game.  If n is prefixed with a + or -, it is
	      interpreted as an offset in ply from the current position.  N defaults to +1.

       k n    Mark the current set of games with tag n (see patterns, below).

       w type file
	      Write the current set of games to file.  Type is either a (write the games as text)
	      or m (write the games in binary format suitable for chdb).

       Patterns  select  subsets  of the games.  A pattern is one of the following, in decreasing
       precedence order.  Parentheses can be used for grouping.

       .      The current game.

       *      All games originally read.

       'n     The games previously marked with a k command with the same n.

       []

       [number]
	      All games in * that contain the positions that can be reached in the specified num-
	      ber  of  plies  from  the  current position.  A missing number is the same as zero,
	      meaning just the current position.  Positions are matched with black/white transpo-
	      sitions.

       /regular expression/fields
	      This  pattern  matches  the  regular  expression	against the various text windows.
	      Fields is a list of characters from the set abdefoprw.  A is for all, b for  black,
	      d for date, e for event, f for file, o for opening, p for person (white and black),
	      r for result, and w for white.  If multiple fields are  given,  the  expression  is
	      matched on the union of the specified fields.  If no field is given, p is assumed.

       !pattern
	      The set subtraction of * and the given pattern.

       pattern-pattern
	      The set subtraction of the given patterns.

       pattern+pattern

       pattern|pattern
	      The set union of the given patterns.

       pattern pattern

       pattern&pattern
	      The set intersection of the given patterns.

       +pattern

       -pattern

       &pattern

       |pattern
	      These patterns have the current set of games as an implied first operand.

EXAMPLE
       Select games that Botvinnik lost:

	      (/Botv/w/0-1/r)|(/Botv/b/1-0/r)

FILES
       /lib/chess
	      directory of databases.

SOURCE
       /sys/src/cmd/chdb

SEE ALSO
       regexp(6).

BUGS
       The browser is only a prototype.

       Most of the databases are protected by copyright and not distributed.

											  CHDB(7)


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