                          Chess Assistant Light
                              User's Guide
                                    
			1. About This Manual

     This  manual provides step-by-step instructions for working with  CA
Light  and  introduces  you  to  the main concepts  of  the  program.  It
describes  the menu system and explains how it will allow  you  fast  and
efficient access to the chess data.

			2. System Requirements

    An  IBM  PC/XT, PC AT, Portable PC, PS/2 or a computer that  is  100%
	     compatible;

    The Disk Operating System (DOS), version 3.30 or later;

    640K total main system memory (RAM);

    Hard  disk  (with at least 2 Megabytes of free space to package);

    A graphics display adapter: Hercules, CGA, EGA or VGA;

    A Microsoft Mouse or 100% compatible (optional);

			3. Introduction

     Each electronic book consists of two parts:
     a)  chess  database management program - CA Light  
     b) commented chess games database enclosed with this program

     All games may be easily accessed and examined. You can easily browse
through  games, quickly search for your favourite players and  positions,
look  into the games for sets of positions (chess tree capability),  etc.
In short, with the set of games from the book, you can do whatever a good
chess database management system is capable of.

     "CA Light" is the abridged version of "Chess Assistant" - one of the
most well-known chess database management systems, and over the years its
popularity has steadily increased. This system was developed in 1989-1994
under  the  supervision of Anatoly Karpov and was highly  appreciated  by
many   Russian  and  foreign  grandmasters  (such  as  Shirov,  Seirawan,
Vaganian,  Sokolov,  Novikov,   Vladimirov,  and   many   others).   New,
unconventional, solutions make CA the fastest chess database system (from
100 to 200 times faster when performing position searches).

			3.1. Installation

     1. Insert program disk into your floppy drive (for example A:):

     2. Change the current drive to floppy
          A:

     3. Type Setup and specify the source floppy and destination hard drive 
        letter:

          Setup A: C:

     The electronic book is now  installed on your computer.

			4. What's a dataset ?
     
     In  the  following description of CA Light, the term "dataset"  will
appear  a  great  deal.  So what is a dataset ?  A dataset  can  be  seen
simply  a  subset,  or selection, of games from the database.   When  you
perform  searches,  or  form datasets from line filters  you  are  simply
creating a logical collection of games that share some particular element
you wish to examine.
     
     Other  terms  often  used  to describe datasets  are  "current"  and
"primary".   The  current  dataset  is  simply  just  that;  the  dataset
currently in use.  The primary dataset means that the dataset is equal to
the whole database.
     
        If you look at the line below the menu you will see a summary  of
the number of games in the database, and in the current dataset:
     
                    BASE:Database[440]      DATASET:[37]

     This  shows that the current database has 440 games in it, and  that
37 games are in the current dataset.
     
			5. A First Look
			5.1. Starting CA Light

     With  the  DOS prompt at the directory in which CA Light is  located
(something like "C:\CAB", depending on where you installed the program),
simply enter CA to start CA Light.

     There  are  three  ways to select the Main Menu commands.  With  the
direction  keys  simply highlight one of the commands  and  press  Enter.
Notice  that  as  you  highlight  each  Main  Menu  selection,  a   short
description of what that command does appear above the menu line.

     The second method is simply to type the letter of the command, which
is  highlighted  in  a  different color. This will select  and  call  the
command  immediately, which is obviously faster than using the  direction
keys.

     Finally,  if  you have a mouse, simply move the mouse  so  that  the
mouse pointer is on the desired command, and click the left button.  When
using  a  mouse  the right button acts like the ESC key,  cancelling  the
current command or exiting from a screen.

     You'll  also  notice along the bottom of the Main Menu  screen  that
certain  function keys are available for use as short-cut keys.  In  some
modes  the  ALT  <letter>  and CTRL <letter> key  combinations  are  also
available as short-cuts.

    The  complete  description of all function keys and short-cuts,  that
are  active  in certain modes, is always available via the F1 key,  which
calls-up the context-sensitive help screen.

			5.2 Using Help - F1

     You can get help any time within CA Light by pressing the F1 key.

     Help information appears in a window just like any other information
window.  Often the window may not be large enough to display  the  entire
help  message.  In  this case, simply use the direction  keys  to  scroll
through the information.

     In addition to the context-sensitive Help system, a list of function
key  shortcuts  appears at the bottom of the screen. This line  indicates
what each function key does in the current mode.
     
			In summary:

  - F1                  To get Help any time
  
  Once within Help
  - F1                  Help Index.
  - PgDn and PgUp       scrolling through the information
  - F7                  previous topic
  - F8                  next topic
  - ESC or right mouse buttonexit from Help

     Now you know how to access Help. Press ESC to exit Help.

			5.3 Loading a Database - F7

     In  the  dialogue you can find and select the database you  wish  to
load.  If you installed the program in the directory C:\CAB, then select
the database in the directory C:\CAB\Base called 'database.BFI'

			5.4. Viewing the games (View Mode) - F2

     In View mode you have access to the games of current dataset and you
can play through all the moves and examined the annotations and variants.

     The  next  few moves of the game are displayed in the right  window;
use  the 'right' direction key to play through the game a move at a time.
Use  the  'left' direction to move backwards through the game. The  chess
board  on  the  left  will  display position as  you  move  forwards  and
backwards through the game.
     
     CA  Light also provides an automatic step-through mode while viewing
games, or at any time when looking at a list.

     CTRL Right Arrow 	to move forward in a game,
     CTRL Left Arrow    to go backward.
     Grey +         	increase speed
     Grey -         	decrease speed

     Hit any other key to exit from the automatic mode.
     
     The  ">>"  and  "<<" buttons at the bottom of the View  window  also
enable automatic step-through mode; use the left mouse button to activate
these.
     
     CA Light supports three types of move annotations.

     A.   Short  comments  (Informant-style  special  symbols),  used  to
evaluate moves, positions, ideas, etc.

     B.  Text  comments,  of  unlimited  length,  that  may  include  the
informant-style  symbols used in short comments and the  pieces  used  in
figurine  notation.  Press the TAB key if you want  to  access  the  text
comment window in order to scroll through the contents.  You can see at a
glance which moves have text comments attached, from the View window,  as
they have square symbols before the move notation.

     C.  Tree  (variant) comments, which can be displayed  on  the  chess
board.  It is possible to browse variations of any length and depth.  The
variants are displayed in a special Variant View window, and each leaf of
the  variant tree has it's own designated letter, or letters in the  case
of  very complicated trees. When there are more branches of the tree than
can be seen in the window, the tree scrolls as you move through it. While
you  work  through  the  moves of a variation  the  current  position  is
displayed  on  the  chess board, just as it is when working  through  the
"main line".  You can see at a glance which moves have Variants attached,
from  the View windows, as they have asterisk '*' symbols before the move
notation.   Unlike  text comments, however, you must elect  to  view  the
variants by pressing the ENTER or F2 key while over the relevant move.
     
     Note  that  the  text  comment and variant tree  you  are  currently
looking  at are for the move marked in red in the View window,  and  that
this move has not yet been "made" on the chess board.
     
     When you are in the View mode, the following keys are available:

     F8, F7         look at next / previous game in current dataset
     F3             "line" information
     INS / DELETE   toggle selcted/deleted "mark" for current game
     F5             view  a  list  of the games in the currently  active
		    dataset
     ALT C          toggle graphic cursor ON/OFF
     ALT I          invert chess board
     ESC            exit from the View mode.

		5.5. Browsing the list of games (List Mode) - F5

     To  move through the game list use the direction keys, and the  PgUp
and  PgDn  keys.  You may jump to a specific game in the list  by  simply
typing the game's number, and then hitting ENTER.
     
     When you are in List mode, the following keys are available:

     Left/Right  arrow 	- play  through  the  current  game  on  a  small
			  chess board
     F5             	- view the game in "colored" game notation
     F7              	- view  the  game as a  series  of chess positions 
			  (use direction, PgUp and PgDn keys)
     F6             	- make dataset equal to whole database
     F2 or ENTER    	- jump to the View mode
     F4             	- jump to the Tree mode
     INS / DELETE   	- toggle  selected/deleted "mark" for current game
     F9              	- form new dataset from Marked, Deleted or Commented
			  games (default is Marked)
     ALT  F9          	- form new dataset from Marked, Deleted or Commented
			  games (default is Deleted)
     CTRL  F9           - form new dataset from Marked, Deleted or Commented
			  games (default is Commented)
     F8             	- define the order of the header fields in the list
     ALT  O           	- select  filters  to form  a  new  dataset  
			  (Theory, Classics, Strategy, Tactics, Endgame)
     ESC		- exit from List mode
     
     The "<" and ">" buttons at the bottom of the window can be used like
the Left/Right arrow keys to play through the currently selected game  on
a small chess board.
     
     NOTE: List mode is available in different modes via F5 or ALT F5.

		5.6. Lines structure (Lines mode) - F3

     Lines  are  a  "tree" structure that can help you when studying  the
database contents.
     The  first  line  describes  the main (classic)  moves  for  current
variant.
     For example:
           1.e4  c5 2.Nf3 Nc6 3.d4 cd 4.Nd4 Nf6 5.Nc3 e5 6.Ndb5 d6 
	   for "Schveshnikov" Sicilian.

     The  next lines/sublines illustrate the different ways the game  may
develop:
               7. Nd5 Nd5 8.ed
                    8...Nb8
                    8...Ne7
               7. a4
               .......  .......

     For  particular  line or subline, information is  available  on  the
right of the window that shows:
               A. Key position
               B. Opening estimation statistics
               C. Number of games

     If  the current line has a "point" marker at its beginning it  means
that the line has sublines, that are currently hidden. Press ALT H or use
the right mouse button to toggle the hidden status of sublines.
     
     When you are in Lines mode, the following keys are available:
     
     Direction keysscroll through the different lines, analyzing position
and statistics.

     INS  	- toggle the "mark" for the current line or subline
     F2   	- form  dataset from games of the current line and jump  to
	  	  the View mode
     F4   	- form  dataset from games of the current line and jump  to
	 	  the Tree mode
     F5 	- form  dataset from games of the current line and jump  to
		  the List mode
     ESC 	- exit from Lines mode
     
     Each  game  has up to 5 different filter markers ('A' to 'E')  which
indicate  interesting characteristics to be found in  the  game  (Theory,
Classics,  Strategy, Tactics, Endgame). Use ALT O or F8 to  define  these
filters.

     Note:
           1.  There  are  some  games in each line  which  have  no  Key
position, due to move exchanges.
           2. When CA Light forms the dataset, from the current line, for
View  or  List  mode  it  will  put only those  games  that  contain  the
characteristics defined by the filters.
     
     The Lines mode also available in View mode by pressing F3.
     

			6. Searches
	6.1.Search for Header fields (Header Search) - CTRL F9

     If  you  wish to locate games based on the information contained  in
the  game  header (see list below) then use the Header Search  screen  to
fill  out the criteria of the search.  Select each of the fields you wish
to  "search on" by using the up and down direction keys, and hit ENTER to
enter a value into that field.  Most fields then present you with a  list
of  possible items that can be inserted into the selected field, and  you
can simply move through the list using the direction keys or the PgUp and
PgDn keys, and select the item using the ENTER key.  A more efficient way
of  selecting the item is to start spelling the item; CA Light will  then
jump  to  the  first item that matches the spelling you have entered,  or
beep if no items exist with the spelling.

Names of Players:   In  the  convention: Surname, Middle name  (if  any),
                    Christian  name  (or  Initial if the  christian  name
                    isn't known).  The search for players is affected  by
                    the   "Ignore  colors"  check  box;  see  below   for
                    description.

Score:              "1:0"  stands for White wins, "1/2" for a draw, "0:1"
                    for Black wins, and "?" for an undefined result.

Year:               Year in which the game took place.

Place:              City in which the game took place.

Class:              Class of tournament.

Game Number:        Game number in match.

Opening:            Allows    easy    search   by    standard    openings
                    classification.

Opening Index:      Encyclopedia  of Chess Openings (ECO)  classification
                    code.

Remark:             Game's source, conditions, etc.

Moves:              The number of moves in a game.

Ignore colors:      If  this  check  box is "ticked" then CA  Light  will
                    select  any game where either the White and/or  Black
                    player selection played either color.  If this  check
                    box  is  not "ticked" then CA Light will select  only
                    those games where the White and/or Black played their
                    relevant color.

     From  the  Main  Screen, highlight the "SEARCH"  command  and  press
ENTER. Now choose the Header command.

     Imagine, you want to find any Karpov vs. Kasparov games...
     The  cursor is already placed at the "White" field, so simply  press
ENTER.

     A  list of all the players in the database appears on the right. You
can  use the direction keys and/or the PgDn key to find Karpov, but  that
might take awhile. Try typing out his name instead.

     Press  K  (it  need not be capitalized) and you'll immediately  find
yourself  at the items beginning with 'K'. Type the next letters  of  his
name,  until you have moved to the item "Karpov Anatoly (RUS)". With  the
desired name now highlighted, simply press ENTER. His name is transferred
to the Search Window and the list of names disappears.

     Now  use the direction keys to highlight the "Black" field and  then
press  ENTER. Repeat the same procedure to find Kasparov. Find  his  name
and  press  ENTER. You can go ahead and run the search right  now,  which
would find all the games between Karpov and Kasparov in database.

     You  might  be wondering: "But it will find only those  games  where
Karpov  played  white and Kasparov black!" Don't worry, we  have  already
taken care of this. If "Ignore colors" check box is turned on, search  by
"White"  or  "Black" field will be performed irrespective  of  the  color
played.

     Press F9 to "Set" the search criteria and you'll be back to the Main
Search Screen with the information displayed in the right window.

     Select  the  "Database" radio button, to search the whole  database,
not the current dataset.

     Press F9 again to start the actual search.
     A  dataset  will be created containing all the games that match  the
search criteria.

     Press F2 in order to view the games you found in the search or F5 to
see the list.


	6.2. Search for board positions (Position search) - F9

     CA  Light's Position Searches look through the database in terms  of
the  positioning  of the chess pieces on the board. The position  can  be
defined manually on the main chessboard or loaded from disk.

     CA  Light  offers two general ways to manually setup the  chessboard
for a Position Search:

     A.  The first begins with pieces already on the board which you  can
move  to  any  location, irrespective of whether they  represent  "legal"
chess moves, or not.

     B.  The  second  presents a palette of pieces,  empty  squares,  and
question marks which you may move from the palette to the main chessboard
with  the  mouse and/or direction keys. The palette is displayed  in  the
Position Search screen by turning on the "Palette" check box.
     
     From  the  Main  Screen, highlight the "SEARCH"  command  and  press
ENTER. Now choose the Position command.

     The  small window called "Position Search" has several options.  The
first thing to do now is to set the desired position up on a chess board.
This is where a mouse is much more convenient than a keyboard.

    Simply  point at the piece you want to move, press and hold the  left
mouse button, move the piece to the desired square, and release  the mouse
button.

     If  you have no mouse, use the direction keys to move to the desired
square and press:

     P for white pawn   	CTRL P for black pawn
     N for white knight  	CTRL N for black knight
     B for white bishop  	CTRL B for black bishop
     R for white rook         	CTRL R for black rook
     Q for white queen   	CTRL Q for black queen
     K for white king         	CTRL K for black king
     C for empty square
     
     In addition to the two techniques noted above for positioning pieces
on the board, CA Light offers the following short-cuts for common tasks:

  ALT C		Clear the Main chessboard
  ALT W  	White pieces in initial position
  ALT B  	Black pieces in initial position
  ALT Q   	Black/white  question marks on all squares  (see  "Search
  		for pattern" later)
  ALT I  	Initial Position for both Black and White
     
     		Search for position

     For  now, let's search for a common opening position. (For instance,
Sicilian Defence.) Move white king's pawn from e2 to e4 and black  king's
pawn from c7 to c5.
	
     Select the "White to move" radio button.

     Press F9 to "set" the position, and F9 again to start the search.

     Once  the  search  has completed, a dataset will have  been  created
containing all the games that start 1.e4 c5; press F2 to view  the  games
or press F5 to see the list the games.
     
		Search for pattern

     Besides  the ordinary position search, where you define the absolute
position  of  the  pieces on the board, you may also  perform  a  pattern
search.

     A  square can be occupied either by any piece or by a question mark.
It  can  also  be empty. White question mark stands for any white  piece,
black - for any black piece. A double question mark stands for either any
piece  of  any color, or for an empty square. All empty squares mean,  is
that during the search no piece should occupy this square.

     Probably  the most common use for this kind of search  is  for  pawn
structure. Typical pawn structures arise in many openings.

     If  playing  the  Sicilian Defence and you  want  to  find  all  the
positions  where  the  following typical pawn structure  occurred:  white
pawns on e4; black pawns on d6 and e5

     Press ALT Q to fill the board with question marks and then place the
pawns on appropriate squares.

     Turn  on  the  radio  button, indicating who is  to  move:  "White",
"Black" or "Any".

     Press F9 to "set" the position, and F9 again to start the search.

     Once  the  search  has completed, a dataset will have  been  created
containing all the games that contain the specified pawn structure; press
F2 to view the games or press F5 to see the list the games.
     

		6.3. Search for the end/middlegame Position 
			(Material search)- ALT F9

     CA  Light's Material search looks through the database in  terms  of
the  material  that existed at any particular time. You  may  search  for
games  where  both players had two queens each, or for games  with  queen
opposing rook, knight and bishop.

     From  the  Main  Screen, highlight the "SEARCH"  command  and  press
ENTER. Now choose the Material command.

     We're  going to look for those games in which both players  had  two
queens! The cursor now rests next to the white queen. Type in a 2.  Press
the Right arrow. Type 2 again, followed by a right arrow key.

     You'll  notice  you've just told CA Light to look for  any  game  in
which  White  had  "between two and two" queens.  You  could  have  typed
"between 1 and 2", but we wanted exactly two.

     Now do the same for the black queen, typing in 2 in both places.
     Press F9 to "set" the material, and F9 again to start the search.
     

			6.4. The Chess Tree - F4

     CA Light's Chess Tree is an extremely powerful and flexible tool for
studying chess.

     Instead  of  separate games, think of the database  as  hundreds  of
thousands of different  positions. A series of moves (a path) leads  from
one  position to another. It's possible that different games had the same
positions, but got there through different paths. How does CA Light  help
you to find  these "paths"?

     Chess  Tree  allows us to browse the whole database or  the  current
dataset as a large game. A special window reflects all the moves from the
position  on  the  chess board, that are contained  in  the  database  or
current  dataset  as well as all the paths leading to this  position.  It
shows  how  often the position occurred  and gives statistics  for  every
move from this position:

     a) the number of games in which a move occurred;
     b) the percentage of occurrences for each move;
     c) how  many games after this move were won by White, won by Black,
        or drawn;
     d) the same as c), but as a percentage.
     
     Press F4 to enter the Chess Tree.

     There is a fair amount of complex information displayed in the  Tree
Window,  so bear with us as we explain it all. In this example,  we  look
into our Chess Tree in the initial position.

     The  "Games" field in the middle of the Chess Tree Window  indicates
that  CA  Light  found  NNN  games in its  current  dataset  having  that
position.  Not  surprising,  right, since every  game  starts  from  this
position! So far, so good.

     The  top  line of the Chess Tree Window says, "Paths from: N1"  This
means that CA Light found N1 'next' positions. Next to this you will  see
"Paths  to:  0", which indicates that there is 0 paths that led  to  this
position.  Again, not surprising, since we're starting from  the  initial
position.

     Right  below  the "Paths from:" information you'll  see  a  list  of
moves,  in  this  case starting with the pawn from e2  to  e4,  with  the
chessboard  on  the left "illuminating" that move. The paths  to/from  is
always  shown  in descending order of popularity, i.e. the first  is  the
most  played  move,  then  the  second,  etc.  The  information  in   the
"Statistics  for  move" window indicates that of the  NNN  games  in  the
dataset, M started with this move. Of those M, M1 resulted in White wins,
M2 in a draw, and M3 in Black wins. Interesting, isn't it?

     The  most  popular move in this dataset is 1.e4, but what about  its
effectiveness? It is clear that "1:0", "1/2" and "0:1" percents give  the
information on this. But how to compare the moves? Three numbers  are  to
be  compared to another three?! The following common criterion solves the
problem (sign "/" means division):

     Effectiveness = "1:0 percent" + "1/2 percent" / 2

     Remember that  games  with  undefine result (?) do not count in tree 
statistics.

     Press the "Order" button in Chess Tree window with the mouse or  use
the  function key, choose "By result" and press ENTER .  Did any  of  the
items  in  the Paths to/from change position ?  Some of the less  popular
moves  may move above the more popular moves because we are now  ordering
by  result,  not by quantity, and those less popular moves generally  did
better,  or at least for the data we are studying.  Now let us climb  the
tree...

     Please  change  the  move order back to "By quantity"  and  use  the
direction keys  to select one of these five moves: let's choose the first
one, pawn from e2 to e4 by moving the cursor to it and pressing ENTER.

     You  can  browse  the branches of the tree as  well  as  jump  to  a
position  of  particular interest, by loading it from disk.  Besides  the
standard position load/save capabilities there are three position markers
provided for quick position storage and retrieval within a tree.  At  any
time  you  can  study  the "tree dataset" (the games  where  the  current
position  was found) by pressing the List button. You can exit  from  the
Chess  Tree  and form the current dataset from those displayed  from  the
tree using the "Exit with subset" button.
     
			7. An In-Depth Look
			7.1. Combining Searches

     Some tasks require combination of different kinds of search.

     For  example if you are interested in how Kasparov plays the "Scotch
Opening",  you need to combine header and position searches.  First  find
all  Kasparov's games where we played White. Then search for the position
arising  after 1.e4 e5  2.Kf3 Kc6 3.d4, in the current dataset  (not  the
whole database).  This is achieved by simply pressing the "Dataset" radio
button, prior to starting the search, and means you can easily for  games
that match complex conditions.
     
     Another example: Finding how Karpov plays rook endings. Here  header
and  material  searches  are  combined. Using  header  search,  find  all
Karpov's  games, then perform the material search in the  dataset  formed
from the header search.

     In  most cases, the difficult part is not remembering which  key  or
button to press, but rather what logical approach to take when trying  to
solve  the  particular  problem. The logic  behind  the  search  is  more
difficult than the mechanics.

			7.2 SEARCH Details

			Header Search

     CA  Light  allows you to search by header not only using one  single
key item for each field. You can also define multiple items.

     Imagine  you  want  to find all the games played  by  Karpov  and/or
Kasparov.  One way to solve this task is to look for each of the  players
separately, later saving the games found as separate datasets.  And  then
join them all together.

     But  a  better way is to define multiple keys for the Header fields.
In  order to define several values (in our case - for the names) you  use
INS key instead of ENTER key while you're in the list of items. After you
press  INS  the  corresponding item is marked with a color highlight  and
with  'a  greater than' character (">"). When you have finished  defining
both  players  names  press  ENTER key  to  complete  the  multiple  keys
definition.

     If  you  press the F4 key while still in the list you can  view  the
currently marked names (keys) together. Press the F4 key again to  return
to the whole list.

     In the case of multiple keys they are reflected in the Header window
as  the first value selected and the number of elements in the set  (i.e.
"Karpov (2)"). You may now perform the search as with single keys/
     
     You  may also use the F4 key to specify the logical criteria  "not".
That is, with Karpov already selected in the "White:" field, press F4 and
"~Karpov"  will appear. This search will find any game in  the  currently
active dataset which does not involve Karpov.

     To  erase the information in any criteria field, move the cursor  to
the key you want to clear and press F2 (the "Fresh" key).

     After  defining the desired values for the fields needed,  press  F9
twice  to "Set" the search parameters and start the search on the current
dataset.

			Position Search

     In  order  to move the piece from one location to another,  use  the
following procedures:

			With a Mouse

  To Take a piece:   Point at a desired piece and press the left button.
                The mouse cursor will assume the shape of the piece.

  To Place a piece:  Move the mouse cursor (with the piece "in hand")  to
                the desired location and release the left button.

  To Open/Close Palette:  Click the "Palette" check box.

  To Exit Position  Board: To set the position, pressF9. To exit  without
                setting current position, press F10.

			With the Direction Keys

  To Take a piece:    Move the chessboard cursor so that it highlights  a
                desired piece and press INS.

  To Place a piece:  Move the cursor to a desired position and press INS.

  To Open/Close Palette:   Use  the TAB key to move to the Search  window
                and toggle the "Palette" check box (F5to open Palette).

  To Exit Position  Board: To set the position, press F9. To exit without
                setting current position, press ESC
     
     Using Empty Squares and Question Marks from the Palette

     Obviously, when you take an empty square from the palette and  place
it  over an existing piece on the chessboard, you're essentially deleting
that  piece from the board. An empty square on the chessboard means  that
this  particular  square  must  be empty in  order  to  meet  the  search
criteria.

     Question  marks,  on  the other hand, signify that  this  particular
square can be occupied by any piece of the question mark's color. A white
question mark means that any white piece is in this square, and  a  black
question  mark  signifies that any black piece occupies  this  square.  A
double black/white question mark means that any piece of any color and/or
no  piece at all occupies the given square. That is, the square is either
empty or has a piece on it.

     Question  marks  are  useful when you are  looking  for  a  specific
position  and are interested only in a specific region of the  chessboard
and don't care about other squares.
     
		     Loading and Saving Positions

     This option allows you to save positions to disk for quick retrieval
later on.

     Positions can be saved in one or more "board files". You may  choose
between different files when you load or save a position.

     To  load a position from disk, press F3 when setting-up the Position
to  search  for.   If no board file has yet been selected,  you  will  be
prompted to provide the name of one to load from. Choose a position  from
the list and press ENTER.

     You  can  delete a specific position in the list by highlighting  it
and pressing the DELETE key.

     To save the current position to disk, press F2 to.  Select the board
file  to save to, if one hasn't already been selected and then press  the
[Remark]  button to enter the "title" of the position. Press  the  [Save]
button to save a position to the current board file.  If you wish to save
to a different board file than the one currently selected, then press the
[File] button.

     When  CA  Light terminates it remembers the board file that  was  in
use, and makes it the default board file when it next starts-up.


			7.3. DATASET menu

     To  load  and  save datasets from disk, or to combine datasets  from
disk  with  the  current  dataset using a "logical  operation",  use  the
Operations command.

     The  Statistics command  invokes  the statistics gathering  utility.
You  can analyze the games in the current dataset in terms of the  header
field  values.  The  Statistics command can  give  you  information,  for
example,  how often the given player used the particular opening,  or  in
general, what is the occurrence of the particular header key value in the
dataset.

			7.4. OPTIONS menu

     This  menu contains several internal program settings that  you  may
want to redefine.

     You  may  switch between several game notation types  and  languages
using  the  Notation command, change the video settings using  the  Video
setup  command and change the chess board and View window settings  using
the  Board  setup.   CA Light will remember all of the settings  when  it
terminates, and use them when it restarts.
     
			Notation

     Allows you to specify the type of chess notation (Short, Long, USCF)
and  the  notation language used. Press the appropriate radio  button  to
switch to the desired notation type and language.

     CA  Light supports the following languages: English, German, French,
Italian, Spanish, Dutch, Symbolic, alternative English and user-defined.

     The  user can define their own language in Notation window using the
[Change user-defined language] button. A dialog box appears that  lets  a
user  define  symbols for each piece, from the Pawn to the King.  If  you
click  the [Default] button then the default piece settings are restored.
These  default settings are the same as "Chess (with pawn)". Castling  is
always "O-O" and "O-O-O" regardless of the language.
     
			Video setup

     Allows  you to change the video mode to another one compatible  with
your  video  adapter  and  display. Note that  the  command  affects  the
operation  of  CA  Light  starting from the next session  only.  If  your
adapter does not support the selected mode CA Light will start in a  mode
it assumes to be the best for your adapter.
     
			Miscellaneous
  
    Allows  you  to change settings that affect the chess board  and  the
View windows:
    
    "View/edit  window height" changes the number of lines  that  may  be
seen in the View window.
    
    "Show  current  move in view" toggle the cursor on  the  chess  board
that  shows the source and destination square of the moving piece.   This
is the same as pressing ALT C in View mode.
    
    "Flip  board"  allows the orientation of the board  to  be  reversed.
This is the same as pressing ALT I in View mode.
    
    "Show  and use deleted" games toggles whether games marked as deleted
should be included in searches etc., or otherwise ignored.
    
