% nacteni:
/* ['3.1_3.pl']. */

solution(S) :- template(S), sol(S).

sol([]).
sol([X/Y|Others]) :- sol(Others),
                      member(X,[1,2,3,4,5,6,7,8]),
                      member(Y,[1,2,3,4,5,6,7,8]),
                      noattack(X/Y,Others).

noattack(_,[]).
noattack(X/Y,[X1/Y1|Others]) :- X=\=X1, Y=\=Y1, Y1-Y=\=X1-X, Y1-Y=\=X-X1,
                                noattack(X/Y,Others).

template([_X1/_Y1, _X2/_Y2, _X3/_Y3, _X4/_Y4, _X5/_Y5, _X6/_Y6, _X7/_Y7, _X8/_Y8]).

% demonstracni vypis

start:- 
    write('PROBLEM OSMI DAM I'),nl,
    write('Prvni reseni solution(Solution):'),nl,
    solution(Solution),write(Solution),nl.
?-start.

PROBLEM OSMI DAM I
Prvni reseni solution(Solution):
[8/4,7/2,6/7,5/3,4/6,3/8,2/5,1/1]

#!/usr/bin/env python
# encoding=utf-8 (pep 0263)

from linked_lists import Cons, Nil

def solution(n=8):
    if n == 0:
        yield Nil
    else:
        for others in solution(n-1):
            for x in range(1, 9):
                for y in range(1, 9):
                    if noattack(x, y, others):
                        yield Cons((x, y), others)

def noattack(x, y, others):
    if others == Nil:
        return True
    else:
        x1, y1 = others.head
        return x != x1 and y != y1 and y1-y != x1-x and y1-y != x-x1 and \
               noattack(x, y, others.tail)

# demonstracni vypis
if __name__ == "__main__":
    print("PROBLEM OSMI DAM I")
    print("Volani next(solution()) : %s" % next(solution()))

PROBLEM OSMI DAM I
Volani next(solution()) : [(8, 4), (7, 2), (6, 7), (5, 3), (4, 6), (3, 8), (2, 5), (1, 1)]