c:\test>615969 62
57: Use of uninitialized value in array element at c:\test\615969.pl line 66.
Use of uninitialized value in array element at c:\test\615969.pl line 66.
Use of uninitialized value in array element at c:\test\615969.pl line 70.
Use of uninitialized value in array element at c:\test\615969.pl line 70.
Use of uninitialized value in array element at c:\test\615969.pl line 74.
Use of uninitialized value in array element at c:\test\615969.pl line 74.
Use of uninitialized value in array element at c:\test\615969.pl line 78.
Use of uninitialized value in array element at c:\test\615969.pl line 78.
Use of uninitialized value in array element at c:\test\615969.pl line 82.
Use of uninitialized value in array element at c:\test\615969.pl line 82.
Use of uninitialized value in array element at c:\test\615969.pl line 86.
Use of uninitialized value in array element at c:\test\615969.pl line 86.
Use of uninitialized value in array element at c:\test\615969.pl line 90.
Use of uninitialized value in array element at c:\test\615969.pl line 90.
Use of uninitialized value in array element at c:\test\615969.pl line 94.
Use of uninitialized value in array element at c:\test\615969.pl line 94.
Use of uninitialized value in subtraction (-) at c:\test\615969.pl line 95.
Use of uninitialized value in subtraction (-) at c:\test\615969.pl line 96.
Use of uninitialized value in concatenation (.) or string at c:\test\615969.pl line 23.
Use of uninitialized value in concatenation (.) or string at c:\test\615969.pl line 23.
Use of uninitialized value in array element at c:\test\615969.pl line 25.
Use of uninitialized value in array element at c:\test\615969.pl line 25.
60: 0,0->2,1

##</code><code>##

my $steps = shift( @ARGV ) || 64;

my $puzzle_board = create_board();
solve ($puzzle_board);
print_board ($puzzle_board);
...
# Change this number to solve more or less of the puzzle
    while ( $move < $steps ) {

##</code><code>##

        my ($newx, $newy) = calculate_move($board, $x, $y);
        printf "\r$move: $x,$y->$newx,$newy\t";

##</code><code>##

c:\test>perl -v

This is perl, v5.8.6 built for MSWin32-x86-multi-thread
(with 3 registered patches, see perl -V for more detail)

Copyright 1987-2004, Larry Wall

Binary build 811 provided by ActiveState Corp. http://www.ActiveState.com
ActiveState is a division of Sophos.
Built Dec 13 2004 09:52:01

##</code><code>##

sub back {
    print "\n*** BACK ***\n";
...

##</code><code>##

c:\test>615969 61
43: 0,7->-2,6
*** BACK ***
43: 6,6->4,5
*** BACK ***
56: 0,6->-2,5
*** BACK ***
56: 6,5->4,4
*** BACK ***
56: 4,4->2,3
*** BACK ***
58: 1,0->-1,-1
*** BACK ***
57: 6,5->4,4
*** BACK ***
57: 4,4->2,3
*** BACK ***
57: 2,3->0,2
*** BACK ***
57: 0,2->-2,1
*** BACK ***
57: 6,1->4,0
*** BACK ***
57: 4,0->2,-1
*** BACK ***
57: 2,7->0,6
*** BACK ***
57: 0,6->-2,5
*** BACK ***
58: 7,7->5,6
*** BACK ***
58: 5,6->3,5
*** BACK ***
58: 3,5->1,4
*** BACK ***
58: 1,4->-1,3
*** BACK ***
57: 6,1->4,0
*** BACK ***
57: 4,0->2,-1
*** BACK ***
57: 2,7->0,6
*** BACK ***
56: 1,4->-1,3
*** BACK ***
55: 6,1->4,0
*** BACK ***
55: 4,0->2,-1
*** BACK ***
56: 0,6->-2,5
*** BACK ***
57: 7,3->5,2
*** BACK ***
59: 7,2->5,1
*** BACK ***
60: 3,0->1,-1
*** BACK ***
59: 0,0->-2,-1
*** BACK ***
59: 6,7->4,6
*** BACK ***
59: 4,6->2,5
*** BACK ***
60: 1,7->0,5
The Chess Board
33   16   19   08   31   14   11   08

18   27   32   15   10   07   30   13

11   34   17   06   29   12   09   06

26   07   10   35   18   05   40   37

35   12   25   08   39   36   19   04

24   09   16   13   20   03   38   41

15   14   23   02   17   42   21   04

00   01   14   15   22   05   42   43