Next up in my latest order from Jakub Dvořák is a set of
three cubes that share a common theme again - two of them from the fertile mind
of Yavuz Demirhan and the third from Japanese puzzle designing legend Osanori Yamamoto. All three target a cube shape and each has three burr pieces to be
inserted into a holey cube frame ... which almost makes it sound like they should
be pretty similar - except they ain't!
The first is called Estergon and was added to Ishino's website back in 2011. It's a 5*5*5 unit cube
with three identical (save for colouring) "almost skeleton" burr
pieces. Each of the burr pieces is offset into a corner of the cube faces, so
you'll realise that the order / combination of the movements is going to be
critical since the pieces are going to interact inside the cube.
When you start playing with this puzzle, and indeed the
other two in this post, there's a lot of movement available - it just all seems
to be pretty useless! In fact if you push the burr bits out to their
extremities, they can almost dangle precariously, mocking you but steadfastly
not coming out!
A more methodical approach will identify a couple of possibly
less expected moves that then allow you to develop some space, and ultimately
allow pieces to pass one another inside the cube and then let the first piece
out in a mere seven moves ... albeit seven moves that eluded me for absolute
ages!
Estergon 2 ramps things up a bit by moving up to a 6*6*6
cube and giving the ends of the three skeleton burr pieces a 3*3 head. That little
"improvement " brings some interesting positions for the internal
sticks and makes it a whole lot harder. Given the increased size of the burr
bits' heads, this one's even more floppy when you start pulling the three burr
pieces out, and yet you won't be able to get past the other pieces inside there
... it will certainly tease you, but it won't give its secrets away without a
fight...
This one also took me an inordinate amount of time to work
out - there are some unusual little moves and you're pretty spoilt for choice
in terms of what to do along the way, so there is plenty of opportunity to
wander down a blind alley along the way - or that's my excuse at least!
[A little word on the craftsmanship here: Jakub made these two
at the same time and I guess he knew folks would be getting them together,
seeing as how they're one and two of a set... so he resized the sticks on
Estergon so that the cube was the same size even though it's a 5*5*5 cube next
to Estergon 2 which is a 6*6*6 ... nice touch!]
Castle Hole by Osanori Yamamoto shares some similarities
with Estergon in that it's a 5*5*5 cube with three simple burr pieces running
through it, but whereas Estergon has solid sides in its target state, Castle
Hole has three faces with three missing cubies on each... and those little
holes make all the difference.
Being "just" a 5*5*5 cube, the pieces don't tend
to dangle around quite as much as they do with Estergon 2, and working out
where you can move the pieces using those extra little holes will yet again
provide plenty of blind alleys to wander aimlessly around - ask me about them,
I suspect I explored them all along the way!
In the end, there's a single, rather elegant solution to
freeing up just enough space to remove the first piece in 11 moves... a great little puzzle - really like the wood on
this one.
Allard, after reading your review, I wonder now if I should have gotten the Estergon instead of the Estergon2.
ReplyDeleteWrong question Jerry! The right question is "Why didn't I get both?" :-)
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