Neil's Puzzle Building Blog
16May/140

2 Halves Cage 4 A

Well that's a bit of a mouthful isn't it! 2 Halves is a burr puzzle designed by Gregory Benedetti, with my copy being made by the very talented Maurice Vigouroux. Back in November 2013, this came up for sale on Puzzle Paradise with a couple of options for woods used. Seeing the Ebony cage and Bloodwood pieces, I didn't hesitate, and bought it there and then. I certainly wasn't disappointed.

2 Halves Caged 4 A by Gregory Benedetti

2 Halves Caged 4 A by Gregory Benedetti

Despite not being particularly good with Burr puzzles, this doesn't look like a burr, and the jet black Ebony surrounding the deep red of the Bloodwood makes it look imposing. That's probably a good thing, as this is not a simple puzzle. It's not a small puzzle either. Each cubie is 7/16", making it 3" x 3" x 3" overall, meaning that Maurice was working with 1" thick stock to make the burr pieces. It's a great size and manipulating the pieces inside the frame is easy given the size of the pieces. It's heavy too. Ebony is a very dense heavy wood, so this puzzle has a really solid heft to it. The fit and finish are excellent with the Ebony being polished to a reflective shine. The pieces all slide past each other perfectly, and the tolerances are spot on.

The first night I spent around 40 minutes playing around with the puzzle and managed to create some space in the cage to move the burr pieces around a little, but I hit a dead-end and couldn't see a way to progress further. There seemed to be a huge amount of space in the puzzle, but the cage was still firmly held in place, and the was no way I was sliding any of the burr pieces out of the cage.

Partially solved with pieces sticking out like a Hedgehog

Partially solved with pieces sticking out like a Hedgehog

This carried on for a few days where I'd spend 20 minutes or so each night trying to make progress and really getting nowhere. As often happens, things got busy, and the puzzle was left on a shelf for a while with pieces sticking out of the sides, looking a little like a hedgehog. Recently I had a little free time, and picked this up again, since it was sitting looking at me and I felt bad that I'd not finished it.

After about an hour, I finally managed to shuffle the burr pieces into the right locations to be able to remove one half of the cage! Progress. It was quite the achievement to have made it this far, and spurred on by my success, I carried on to remove the rest of the pieces. I thought I was past the difficult part and the remainder was going to be easy. After all, I now had a lot of space, and removing the remaining pieces should be easy!

Isn't it great when you're totally wrong. The puzzle is a level 17.14.9.5.3 puzzle. So removing the first half of the cage, I'd only finished the first 17 steps. I had another 14 to remove the first burr piece, and then another 9 to remove the second. This is one tough puzzle. I spent another 15 minutes figuring out how to move the pieces around and take that first burr piece out of the remaining cage half, but I finally got there. Let's just say I didn't do it in just 14 moves!

Six burr pieces, plus the two cage halves

Six burr pieces, plus the two cage halves

As far as value for money goes, this has been a great puzzle. I've had a lot of puzzling time out of it, and I have to admit that I really enjoyed it. This is a little worrying for me, as I've never really found much fun in playing with Burr's. Maybe I've found something else that I do enjoy after all.

The 2 Halves is certainly a different style of Burr, with the cage interacting with the burr pieces in such a way that it really adds an extra challenge. The cage itself blocks your view of the voids in the burr, making it much more difficult to see how to progress, and it also adds some structure, keeping the pieces in the right locations without needing an extra hand to prevent them from falling or rotating into a position which makes it difficult to move the next piece.

Now, I freely admit that I'm not good enough with burr's to be able to re-assemble this one on my own. It was enough of a challenge to just take it apart. Not to mention that I didn't pay any attention to how the pieces came out, or the order, so I didn't even have a reference to how to put them back.

There's only one possible assembly out of 1,844 possible orientations of the pieces in the final shape, so it could take a very long time to put this back together with trial and error. I know when I'm beaten, and turned to the trusty Burr Tools to help. Even there it took me three attempts to get the pieces entered correctly for Burr Tools to be able to solve the puzzle. I have no idea how Gregory designed this, but I have to take my hat off to him. It's a great design, and I can't recommend it enough, even if you're like me, and are not a fan of Burr's normally.



9Oct/124

Blind Burr

One of the Top 10 Vote Getters at this years IPP design competition was the Blind Burr, designed by Gregory Benedetti and made by Maurice Vigouroux. I had the great pleasure of being able to talk to Gregory about his puzzle designs and certainly enjoyed playing with his entry in the puzzle competition, so when I had the chance to pick one up on the day of the puzzle party, I didn't hesitate.

Blind Burr by Gregory Benedetti

Blind Burr by Gregory Benedetti

Made from some beautiful slabs of purple heart, the puzzle measures 3.25" x 3.25" x 3.25". Each piece is cut from a solid chunk of purple heart, measuring a full inch thick, so the pieces are incredibly sturdy and finished to the high standard that is common for work from Maurice Vigouroux. Each of the pieces is polished to a high shine, and the ends of the pieces have been chamfered to really finish the puzzle nicely.

Limited edition number and Maurice's stamp

Limited edition number and Maurice's stamp

As you can see each puzzle was numbered in a limited edition of 50, and the number is stamped into the wood, along with Maurice's signature. There was a very interesting discussion on one of the Puzzle Forum's about what makes a puzzle Limited Edition, which showed that there are many definitions to many different people. It turns out that in this case it's limited because Maurice agreed to make 50, and no more! The reason why is fairly obvious when you start to play with the puzzle.

I've probably mentioned before that I'm not a huge Burr puzzle fan. There's many other puzzle types out there that I get far more excited about than Burrs. So why did I make sure to get a copy of this one. And why's it called a Blind Burr .... in my experience pretty much all Burr's are blind. Well I'm not sure I can answer the second question, but I will answer the first. And the answer is pretty simple, this is no ordinary burr!

Edit: I can't answer why it's called the Blind Burr, but Greg did. Check out the comments for the answer!

Lots of movement but little progress

Lots of movement but little progress

Immediately on picking up the puzzle, you find that there are three pieces which are pretty loose, and move a fair distance. Looking at the inner part of the piece which slides out you'll see it's completely smooth, so whatever burrs exist, they are only in the top 1/3 of the piece which remains hidden in the centre of the puzzle. Of course all of this movement doesn't really help much, as there is no movement at all in the remaining three pieces. Strange and definitely not an average burr.

Despite the piece on the right in the image above leaving enough space for the top piece to slide over it, that piece won't budge. Something in there is keeping it in place and there's no real hint of movement. Time to go back to the drawing board and figure out what else can move in the puzzle.

After some feeling around, you start to see that there may be another way to make progress, and sure enough that yields a little more movement in one of the pieces, and after that the rest of the puzzle will come apart using coordinate motion. It's a really beautiful movement if not particularly difficult, and well worth the time to understand.

The pieces of the Blind burr (some details hidden)

The pieces of the Blind burr (some details hidden)

I don't want to give too much away, as the discovery of the puzzle mechanism is a joy but you can see the seven pieces which make up the puzzle, with some familiar 45 degree blocks in there which are used in the coordinate motion. That cube was a bit of a surprise!

Putting the puzzle back together is marginally trickier than taking it apart as some dexterity is required during the assembly, and despite taking it apart and putting it back together a number of times now, I still struggle a little to get the first three pieces aligned correctly.

All in all it's a great design, and rather deserving of its Top 10 vote. All of these are currently sold, but if you see one come up for sale, grab it. It really is a fun puzzle, and even for a non-Burr fan like me, you'll enjoy it.