{"product_id":"separated-board-burr-set","title":"分離型板組木セット｜プロ向けバンドル","description":"\u003ch2\u003eSeparated Board Burr Set - Quick Summary\u003c\/h2\u003e\n\u003cp\u003eAll three of Frans de Vreugd's separated board burrs in one set: ZigZag at level 7.8, Torture at level 17.4 and Extreme Torture at level 28-22-9-8-3. Eighteen flat boards, three separate builds, solved in that order. Hard through Expert. All three ship disassembled.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e burr collectors filling a gap in their board burr shelf, and solvers who want to work through a family of designs in the order the designer built them rather than buying the hardest one and getting stuck.\u003c\/p\u003e\n\u003ch2\u003eOne Idea, Taken to the End\u003c\/h2\u003e\n\u003cp\u003eIn 2002 Jim Gooch suggested to Frans de Vreugd that you could take a standard six board burr and pull the two boards in each pair one unit apart. The resulting shape had far more room for complicated movement, and de Vreugd wrote a computer search to find piece sets that would still go together.\u003c\/p\u003e\n\u003cp\u003eZigZag came first and is the one you can reason about: seven moves and it splits into two identical halves. Torture came next, level 17.4, with 7,680 assemblies and exactly one solution among them. Extreme Torture was the last push, the hardest form found in de Vreugd's research, at 70 moves to take apart.\u003c\/p\u003e\n\u003cp\u003eSolving them in that order is the point of the set. Each one teaches you something the next one takes away.\u003c\/p\u003e\n\u003ch2\u003eWhat Is in the Set\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/ja\/products\/zigzag\"\u003eZigZag\u003c\/a\u003e\u003c\/strong\u003e - level 7.8, Hard. Six boards in two colours. The first separated board burr ever made.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/ja\/products\/torture\"\u003eTorture\u003c\/a\u003e\u003c\/strong\u003e - level 17.4, Expert. Six boards. One solution out of 7,680 assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/ja\/products\/extreme-torture\"\u003eExtreme Torture\u003c\/a\u003e\u003c\/strong\u003e - level 28-22-9-8-3, Expert. Six boards, 70 moves to take apart. Produced commercially for years as Gordian's Knot, now discontinued.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eThey Arrive in Pieces\u003c\/h2\u003e\n\u003cp\u003eAll three ship disassembled, as eighteen loose boards across three puzzles. There is no solved state to copy in any of them. Assembly is the challenge in every case.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is a separated board burr?\u003c\/h3\u003e\n\u003cp\u003eA standard six board burr has six flat pieces grouped in three pairs. In a separated board burr the two boards in each pair sit one unit apart rather than flush together. The gap opens the shape up and allows much longer move sequences than a normal board burr can hold. Jim Gooch suggested it in 2002, Frans de Vreugd designed the puzzles.\u003c\/p\u003e\n\u003ch3\u003eWhat order should I solve them in?\u003c\/h3\u003e\n\u003cp\u003eZigZag, then Torture, then Extreme Torture. That is the order they were designed in and the order they get harder. ZigZag has a symmetry you can work with, and it prepares you for the other two.\u003c\/p\u003e\n\u003ch3\u003eDo they arrive assembled?\u003c\/h3\u003e\n\u003cp\u003eNo. All three ship as loose boards. Assembling them is the puzzle.\u003c\/p\u003e\n\u003ch3\u003eAre these suitable for a beginner?\u003c\/h3\u003e\n\u003cp\u003eNot as a first mechanical puzzle. ZigZag is a fair entry point for someone who has solved a standard six-piece burr before, but Torture and Extreme Torture are Expert and will take repeated sittings.\u003c\/p\u003e","brand":"Greg Puzzles","offers":[{"title":"Default Title","offer_id":51411296125095,"sku":"GP-SEPABOAR","price":48.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0668\/2827\/1783\/files\/separated_board_burr_set_marble.png?v=1790216410","url":"https:\/\/gregpuzzles.com\/ja\/products\/separated-board-burr-set","provider":"Greg Puzzles","version":"1.0","type":"link"}