Re: a challenge related to the 15 puzzle Allen Senior Member Posts: 562 Threads: 27 Joined: Oct 2006 01-17-2011, 10:10 AM Don, That's an interesting article. It reminds me very much of a Turing state machine, whereby the numbers in each grid become a GOTO instruction. It basically counts the number of closed GOTO loops in the grid- really interesting approach! With one register in each variable, this would be interesting to do using indirect registers. Pseudo code for 41cv/42s: ```0. Enter matrix in registers 1-15 1. Format Stack, clear parity flag 2. recall register 1 3. use -1 STO* IND ST Y to mark the register "visited" 4. indirectly recall next memory location 5. If greater than 0 goto 3, 6. starting from beginning of matrix find first number > 0 if == 00 (register 16) goto 9 7. Toggle parity flag 8. goto 3 9. recall parity flag (done) ``` « Next Oldest | Next Newest »

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