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Hi, I am trying to make 8-tiles problem in prolog but my code is not running .

To be more specific when I type an action then I take false.

So the new state is not printed.

```
move([0, Y, Z], [Y, 0, Z], right).
move([X, 0, Z], [0, X, Z], left).
move([X, 0, Z], [X, Z, 0], right).
move([X, Y, 0], [X, 0, Y], left).
arc_horiz([X, Y, Z], [X1, Y, Z], Direction) :- move(X, X1, Direction).
arc_horiz([X, Y, Z], [X, Y1, Z], Direction) :- move(Y, Y1, Direction).
arc_horiz([X, Y, Z], [X, Y, Z1], Direction) :- move(Z, Z1, Direction).
switch([[X1, Y1, Z1], [X2, Y2, Z2], [X3, Y3, Z3]], [[X1, X2 , X3], [Y1, Y2 , Y3], [Z1, Z2, Z3]]).
arc_vert(RowState1, RowState2, up) :- switch(RowState1, ColState1),
arc_horiz(ColState1, ColState2, left),
switch(RowState2, ColState2).
arc_vert(RowState1, RowState2, down) :- switch(RowState1, ColState1),
arc_horiz(ColState1, ColState2, right),
switch(RowState2, ColState2).
arc(State1, State2,left) :- arc_horiz(State1, State2, left).
arc(State1, State2,up) :- arc_vert(State1, State2, up).
arc(State1, State2,right):- arc_horiz(State1, State2, right).
arc(State1, State2,down) :- arc_vert(State1, State2, down).
search([[1,2,3],[8,0,4],[7,6,5]]) :- write('Goal'),nl,nl.
search(X) :- writeln('Actions : left, right, up, down'),
read(Action),
arc(X,State2,Action),
write(State2),
search(State2).
start :-
INITIAL = start([[2, 8, 3], [1, 6, 4], [7, 0, 5]]),
writeln(INITIAL),
assert(INITIAL),
search(INITIAL).
```

For example

1?- start.

start([[2,8,3],[1,6,4],[7,0,5]])

Actions : left, right, up, down

|: left.

false.

Could you help me please ?

*Edited 4 Years Ago by peter20*: n/a