Test Tictac

Jan Burse, created Sep 15. 2018
/**
* Prolog code for the tic-tac-toe game.
*
* Min-max search via negation.
*
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
*
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* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
*
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
*
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
*
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
% move(+Board, +Player, -Board)
move([[-,B,C],[D,E,F],[G,H,I]], P, [[P,B,C],[D,E,F],[G,H,I]]).
move([[A,-,C],[D,E,F],[G,H,I]], P, [[A,P,C],[D,E,F],[G,H,I]]).
move([[A,B,-],[D,E,F],[G,H,I]], P, [[A,B,P],[D,E,F],[G,H,I]]).
move([[A,B,C],[-,E,F],[G,H,I]], P, [[A,B,C],[P,E,F],[G,H,I]]).
move([[A,B,C],[D,-,F],[G,H,I]], P, [[A,B,C],[D,P,F],[G,H,I]]).
move([[A,B,C],[D,E,-],[G,H,I]], P, [[A,B,C],[D,E,P],[G,H,I]]).
move([[A,B,C],[D,E,F],[-,H,I]], P, [[A,B,C],[D,E,F],[P,H,I]]).
move([[A,B,C],[D,E,F],[G,-,I]], P, [[A,B,C],[D,E,F],[G,P,I]]).
move([[A,B,C],[D,E,F],[G,H,-]], P, [[A,B,C],[D,E,F],[G,H,P]]).
% init(+Board)
init([[-,-,-],[-,-,-],[-,-,-]]).
% win(+Board, +Player)
win([[P,P,P],[_,_,_],[_,_,_]], P).
win([[_,_,_],[P,P,P],[_,_,_]], P).
win([[_,_,_],[_,_,_],[P,P,P]], P).
win([[P,_,_],[P,_,_],[P,_,_]], P).
win([[_,P,_],[_,P,_],[_,P,_]], P).
win([[_,_,P],[_,_,P],[_,_,P]], P).
win([[P,_,_],[_,P,_],[_,_,P]], P).
win([[_,_,P],[_,P,_],[P,_,_]], P).
% other(+Player, -Player).
other(o, x).
other(x, o).
% tie(+Board, +Player)
tie(X, P) :-
\+ move(X, P, _).
% best(+Board, +Player, -Board)
best(X, P, Y) :-
move(X, P, Y),
( win(Y, P) -> true
; other(P, Q),
\+ tie(Y, Q),
\+ best(Y, Q, _)).
% tictac
init(X),
best(X, x, _).

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