1. Title: Knight Pin Chess End-Game Database Creator

2. Sources:
    (a) Database originally described by Ross Quinlan.
    (b) Donor/Coder: Jeff Schlimmer (Jeff.Schlimmer@cs.cmu.edu)
    (c) Date: 3 October 1988

3. Past Usage:
     Quinlan, J.R. (1983).  Learning Efficient Classification Procedures and
     Their Application to Chess End Games.  In R.S. Michalski, J.G. Carbonell,
     & T.M. Mitchell (Eds.), Machine Learning -- An Artificial Intelligence
     Approach, 463-482, Palo Alto: Tioga.

4. Relevant Information:
    The companion file is a Common Lisp demonstration file that generates
    knight-pin Chess end-game samples.  Start up Lisp and load the file.
    It generates 100 end-games and writes them to a separate file.  Look
    at the end of the file to see how to change it so that it will
    produce more end-games, or use the file for output that you wish.

    The code is released for experimental, confidential use only.
    See the end of the file for load-time commands that generate a file of
    examples in Quinlan's format.

5. Number of Instances: chosen by user

6. Number of Attributes: 22 possible

7. Attribute Summaries:
    Class: knight's side is lost in n-ply (n=2, 3, etc)
    1. distance from black king to knight		    1, 2, >2
    2. distance from black king to rook			    1, 2, >2
    3. distance from black king to white king		    1, 2, >2
    4. distance from white king to knight		    1, 2, >2
    5. distance from white king to rook			    1, 2, >2
    6. distance from rook to knight (ADDED)		    1, 2, >2
    7. board relationship of black king and knight (ADDED)  diag, rect, other
    8. board relationship of black king and rook (ADDED)    diag, rect, other
    9. board relationship of black king and white king (ADDED) diag,rect,other
   10. board relationship of white king and knight (ADDED)  diag, rect, other
   11. board relationship of white king and rook (ADDED)    diag, rect, other
   12. board relationship of white rook and knight (ADDED)  diag, rect, other
   13. type of black king's initial square		    corner, edge, open
   14. type of black knight's initial square (ADDED)	    corner, edge, open
   15. type of white king's initial square (ADDED)	    corner, edge, open
   16. type of white rook's initial square (ADDED)	    corner, edge, open
   17. rook checks black king (OMITTED, always f)	    t, f
   18. rook threatens knight (OMITTED, always t)	    t, f
   19. knight threatens rook (OMITTED, always f)	    t, f
   20. black king, knight, rook in line (OMITTED, always t) t, f
   21. black king can move adjacent to knight (OMITTED)	    t, f
   22. knight can interpose adjacent to king (OMITTED)	    t, f

8. Missing Attributes: --

9. Class Distribution: See the reference, page 472.