15 Puzzle Thread

[CLL Smooth]

Hello, can anyone solve this? It's basically 15-puzzle but with numbers 1-8. The right one is how the left should look like in 62 moves

Yes. Is 62 moves important because I didn’t count? If the last three numbers don’t work out then you’ll need to swap two of the same number.

 

[Ben Whitmore]

Hello, can anyone solve this? It's basically 15-puzzle but with numbers 1-8. The right one is how the left should look like in 62 moves

It's possible in 28 moves: RDRURDDDLURULDLLDRULUURRDLUL

 

[Iwannaganx]

It's possible in 28 moves: RDRURDDDLURULDLLDRULUURRDLUL

How does this notation work

 

[Ben Whitmore]

How does this notation work

Move one piece right, then one piece down, then one piece right, one piece up, one piece right, three pieces down, etc.

 

[Mech]

Yes. Is 62 moves important because I didn’t count? If the last three numbers don’t work out then you’ll need to swap two of the same number.

Yes the count of moves is essential.

It's possible in 28 moves: RDRURDDDLURULDLLDRULUURRDLUL

Great one, it worked. Thanks for helping

 

[ImmolatedMarmoset]

Anyone got a good alg for cases like

1 2 3 4
5 6 8 7
x x x x
x x x x

or

1 2 3 4
5 6 7 8
13 x x x
9 x. x. x

 

[Natanael]

For the first case I put the empty tile below the seven and do: D R U L U R D D L U R U L D D R U

 

[Natanael]

I just found a better way: empty tile below 8 and do: R D L U L D RR U LL D R U, these are some I found myself, there are probably better ones.

 

[Etotheipi]

What methods do you guys use for 15 puzzle? My method is to solve 1 2 3 4 5 9 and 13, to reduce it to a 3x3 grid, then solve 6 7 8 10 and 14, then just cycle the last 3 pieces. I came up with this on my own, so its probably quite bad, but methods do you people use?

 

[Ben Whitmore]

That's the fringe method, which is the best method. There aren't really any other methods (on small puzzles, anyway) other than solving row by row. But since square puzzles usually take fewer moves than long rectangular puzzles with the same number of tiles, fringe is usually a bit more efficient than row by row.

 

[Etotheipi]

That's the fringe method, which is the best method. There aren't really any other methods (on small puzzles, anyway) other than solving row by row. But since square puzzles usually take fewer moves than long rectangular puzzles with the same number of tiles, fringe is usually a bit more efficient than row by row.

Ok then. =P Thanks.

 

[ProStar]

Best 15 puzzle?

 

[GAN 356 X]

Best 15 puzzle?

Qiyi klotski haven't tried it but it looks good

 

[CodingCuber]

So I got a 15 puzzle and I made up this method to solve it. Someone else probably already created it before me but yeah.

First, you do the top layer and the numbers along the vertical line on the left.

Now, you have reduced the rest to a 3x3 grid and you just solve the rest.

 

[ImmolatedMarmoset]

So I got a 15 puzzle and I made up this method to solve it. Someone else probably already created it before me but yeah.

First, you do the top layer and the numbers along the vertical line on the left.
View attachment 11604
Now, you have reduced the rest to a 3x3 grid and you just solve the rest.
View attachment 11605

Yup, that’s called fringe. Nice job discovering that out.

 

[ProStar]

I'm starting to use fringing, and I keep getting stuck at the 3x3 grid and it will take me like 20 seconds

 

[Deleted member 52530]

So I'm averaging sub 90 on it, using a virtual puzzle. My real life one is so bad. Should I get the qiyi one? And any tips to be sub 1?

 

[Kaneki Uchiha]

practice a lot




i have not done it ever dont listen to me

 

[Deleted member 52530]

New pb 51.37

Shoot, just got a 37.3!

My real life one is so bad. Should I get the qiyi one?

Yes, you should.

I'm pretty mediocre at 15puzl (used to average 17 on slidysim) but generally you should know immediately which pieces go where (i.e. you should know 1,2,3,4 are the top row and 1,5,9,13 are the left column). Do a hundred solves and it should become second nature. Also, don't stare at the pieces you're solving; look at the pieces you need to solve next.

As far as virtual 15 puzzle goes, keyboard controls are probably easier to get fast at than mouse/touch controls.

 

[ProStar]

Definitely get the Qiyi one. I'm averaging around 25 and am switching to fringing. Right now it's just about solving, I got down to 25 with around 100 solves