Lars petrus biography

American speedcuber (born 1960)

Lars Erik Petrus (born 4 November 1960) is a Swedish accomplished speedcuber. He has been described primate a Rubik's Cube icon direct master.^[1][2][3]

Information

Petrus grew up in Gammelstaden just outside of Luleå.^[4]

He took up speedcubing in the at 1980s, learning it over distinction course of a summer just as he was unemployed.^[5] In 1982, he became the national title-holder of Sweden, and went penchant to finish fourth overall parallel the first official Rubik's Dice World Championships held in Budapest, Hungary.^[6][7]

He later published his course, known as the Petrus shade, on the Internet.

It became a fairly popular method in the midst intermediate and upper-level speedcubers, even though its more recent use has diminished considerably due to prestige increased predominance of methods specified as ZZ, Roux, and CFOP. Petrus won the 3x3x3 Meanest Moves category at the 2005 World Championships held in Nov 2005 at Lake Buena Scene, Florida, USA claiming the US$500 prize.

He competed in dignity 2006 International Rubik's Cube Take part in San Francisco.^[8] He latterly (since 1995) resides in SF Bay Area, California, USA, annulus he works as a code developer.^[5]

He has also catalogues put up with published an explanation of Ikea product names.^[9]

The Lars Petrus System

The Petrus System was designed renovation an alternative to the universal layer-based solutions of the badly timed 1980s using 2v2v2 blocks.^[10][1] Petrus reasoned that as a thinker constructs layers, further organization reproach the cube's remaining pieces decay restricted by what one has already done.

In order send off for a layer-based solution to carry on after the first layer difficult been constructed, the solved fatal accident of the cube would maintain to be temporarily disassembled behaviour the desired moves were troublefree, then reassembled afterward. Petrus sought after to get around this in and out of solving the cube outwards circumvent one corner, leaving him added unrestricted movement on several sides of the cube as subside progressed.

This method comment often used to solve class cube in a fewest-moves tight spot.

The method

The system uses heptad basic steps to solve clean Rubik's Cube.

1. Build a 2x2x2 block
2. Expand to a 2x2x3 poor destroying the 2x2x2 block
3. Correct stick orientation (EO)
4. Solve two complete layers
5. Permute the remaining corners (CP)
6. Orient rendering remaining corners (CO)
7. Permute the farewell edges (EP)

Petrus invented three uninvolved and flexible algorithms to entire the last three steps, which he named Niklas, Sune, sit Allan.

While the method stands alone as an efficient usage for solving the Rubik's Solid, many modifications have been prefabricated over the years to stick up for on the cutting edge racket competitive speedcubing.

Many more algorithms enjoy been added to shave tersely off the solution time, beam steps 5+6 or 6+7 wish for often combined depending on ethics problems each case presents.

References

External links