% 1. Title: Chess End-Game -- King+Rook versus King+Pawn on a7%    (usually abbreviated KRKPA7).  The pawn on a7 means it is one square%    away from queening.  It is the King+Rook's side (white) to move.% % 2. Sources:%     (a) Database originally generated and described by Alen Shapiro.%     (b) Donor/Coder: Rob Holte (holte@uottawa.bitnet).  The database%         was supplied to Holte by Peter Clark of the Turing Institute%         in Glasgow (pete@turing.ac.uk).%     (c) Date: 1 August 1989% % 3. Past Usage:%      - Alen D. Shapiro (1983,1987), "Structured Induction in Expert Systems",%        Addison-Wesley.  This book is based on Shapiro's Ph.D. thesis (1983)%        at the University of Edinburgh entitled "The Role of Structured%        Induction in Expert Systems".%      - Stephen Muggleton (1987), "Structuring Knowledge by Asking Questions",%        pp.218-229 in "Progress in Machine Learning", edited by I. Bratko%        and Nada Lavrac, Sigma Press, Wilmslow, England  SK9 5BB.%      - Robert C. Holte, Liane Acker, and Bruce W. Porter (1989),%        "Concept Learning and the Problem of Small Disjuncts",%        Proceedings of IJCAI.  Also available as technical report AI89-106,%        Computer Sciences Department, University of Texas at Austin,%        Austin, Texas 78712.% % 4. Relevant Information:%       The dataset format is described below.  Note: the format of this%     database was modified on 2/26/90 to conform with the format of all%     the other databases in the UCI repository of machine learning databases.% % 5. Number of Instances: 3196 total% % 6. Number of Attributes: 36% % 7. Attribute Summaries:%     Classes (2):  -- White-can-win ("won") and White-cannot-win ("nowin").%           I believe that White is deemed to be unable to win if the Black pawn%           can safely advance.%     Attributes: see Shapiro's book.% % 8. Missing Attributes: --  none% % 9. Class Distribution:%     In 1669 of the positions (52%), White can win.%     In 1527 of the positions (48%), White cannot win.% % The format for instances in this database is a sequence of 37 attribute values.% Each instance is a board-descriptions for this chess endgame.  The first% 36 attributes describe the board.  The last (37th) attribute is the% classification: "win" or "nowin".  There are 0 missing values.% A typical board-description is% % f,f,f,f,f,f,f,f,f,f,f,f,l,f,n,f,f,t,f,f,f,f,f,f,f,t,f,f,f,f,f,f,f,t,t,n,won% % The names of the features do not appear in the board-descriptions.% Instead, each feature correponds to a particular position in the% feature-value list.  For example, the head of this list is the value% for the feature "bkblk".  The following is the list of features, in% the order in which their values appear in the feature-value list:% % [bkblk,bknwy,bkon8,bkona,bkspr,bkxbq,bkxcr,bkxwp,blxwp,bxqsq,cntxt,dsopp,dwipd,%  hdchk,katri,mulch,qxmsq,r2ar8,reskd,reskr,rimmx,rkxwp,rxmsq,simpl,skach,skewr,%  skrxp,spcop,stlmt,thrsk,wkcti,wkna8,wknck,wkovl,wkpos,wtoeg]% % In the file, there is one instance (board position) per line.% % % Num Instances:     3196% Num Attributes:    37% Num Continuous:    0 (Int 0 / Real 0)% Num Discrete:      37% Missing values:    0 /  0.0%%%     name                      type enum ints real     missing    distinct  (1)%   1 'bkblk'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   2 'bknwy'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   3 'bkon8'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   4 'bkona'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   5 'bkspr'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   6 'bkxbq'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   7 'bkxcr'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   8 'bkxwp'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %   9 'blxwp'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  10 'bxqsq'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  11 'cntxt'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  12 'dsopp'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  13 'dwipd'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  14 'hdchk'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  15 'katri'                   Enum 100%   0%   0%     0 /  0%     3 /  0%   0% %  16 'mulch'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  17 'qxmsq'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  18 'r2ar8'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  19 'reskd'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  20 'reskr'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  21 'rimmx'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  22 'rkxwp'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  23 'rxmsq'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  24 'simpl'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  25 'skach'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  26 'skewr'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  27 'skrxp'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  28 'spcop'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  29 'stlmt'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  30 'thrsk'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  31 'wkcti'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  32 'wkna8'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  33 'wknck'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0% %  34 'wkovl'                   Enum 100%   0%   0%     0 /  0%     2 /  0%   0%