241 lines
15 KiB
Plaintext
241 lines
15 KiB
Plaintext
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| TTTTTTT H H EEEEEEE |
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| T H H E |
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| T H H E |
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| T HHHHHHH EEEEE |
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| T H H E |
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| T H H E |
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| T H H EEEEEEE |
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| RRRRRR U U BBBBBB III K K |
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| R R U U B B I K K |
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| R R U U B B I K K |
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| RRRRRR U U BBBBBB I K |
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| R R U U B B I K K |
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| R R U U B B I K K |
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| R R UUUUU BBBBBB III K K |
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| CCCC U U BBBBBB EEEEEEE |
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| C C U U B B E |
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| C U U B B E |
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| C U U BBBBBB EEEEE |
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| C U U B B E |
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| C C U U B B E |
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| CCCC UUUUU BBBBBB EEEEEEE |
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| A Solution to the Rubik Cube |
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| B |
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| _________________________________ |
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| / / / /| |
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| / ULB / UB / UBR / | |
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| /__________/__________/__________/ R| |
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| / / / /| U| |
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| L / UL / U / UR / | B| |
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| /__________/__________/__________/ R| /| |
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| / / / /| U|/ | |
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| / UFL / UF / URF / | / R| B |
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| /__________/__________/__________/ R| /| B| |
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| | | | | F|/ | | |
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| | | | | U/ R| /| |
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| | FLU | FU | FUR | /| |/ | |
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| | | | |/ | / R| |
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| |__________|__________|__________/ R| /| B| |
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| | | | | F|/ | D| |
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| | | | | / R| / |
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| L | FL | F | FR | /| D|/ |
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| | | | |/ | / |
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| |__________|__________|__________/ R| / |
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| | | | | D|/ D |
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| | | | | F/ |
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| | FDL | FD | FRD | / |
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| |__________|__________|__________/ |
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| D |
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|Written by Jonathan Bowen |
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| Programming Research Group |
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| Oxford University Computing Laboratory |
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| 8-11 Keble Road |
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| Oxford OX1 3QD |
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| England |
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| Tel +44-865-273840 |
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|Created October 1981 |
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|Updated April 1985 |
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|Issue 1.1 |
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| Notation |
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|--------------------------------------------------------------|
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|1. Description |
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| ----------- |
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| The Rubik Cube is a cube which may be considered to |
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| consist of 27 miniature cubes or 'cubies'. Each face |
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| is divided into nine square segments. Any face and |
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| its adjacent segments on the other faces may be |
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| rotated relative to the rest of the cube. |
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|2. Faces |
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| ----- |
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| The following letters are used to denote the six faces |
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| of the cube: |
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| U for the upper face, |
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| B for the back face, |
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| F for the front face, |
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| L for the lefthand face, |
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| R for the righthand face, |
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| D for the downward face. |
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| U B F L R D denote a clockwise rotation through |
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| 90 degrees of the face indicated. |
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| U- B- F- L- R- D- denote an anticlockwise rotation |
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| through 90 degrees. |
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| U2 B2 F2 L2 R2 D2 denote a rotation through 180 |
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| degrees. |
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|3. Segments |
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| -------- |
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| Each segment of each face is represented by a string |
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| of one to three letters. The first letter indicates |
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| the face on which the segment is situated. If this is |
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| the only letter in the string then the segment is in |
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| the centre of the face. If one letter follows then the |
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| segment is in the centre of one of the edges of the |
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| face and the second letter indicates the adjacent |
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| face. If two letters follow then the segment is in one |
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| of the corners of the face and the two letters |
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| indicate the two adjacent faces. Note that the order |
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| of the last two letters is immaterial. The following |
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| are examples of segments: |
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| U the centre segment of the upper face. |
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| RF the segment at the centre of the righthand |
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| face's edge which is adjacent to the front |
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| face. |
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| FDL or FLD the corner segment on the front face which |
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| is adjacent to the lefthand and downward |
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| faces. |
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|4. Operation notation |
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| ------------------ |
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| Segments in brackets denote movement of the segments |
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| specified. Elements in the brackets are a cyclic group |
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| and rotate round one place from right to left when the |
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| operation is performed. E.g. (UF,BU,UL) is transformed |
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| to (BU,UL,UF). Note that the first element moves to |
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| the last position. |
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| Operation |
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|--------------------------------------------------------------|
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|1. Get a cross on a face ensuring that the segments match |
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| downwards. |
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|2. Complete the face ensuring that the corners match |
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| across. |
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|3. Using the completed face as the bottom face complete |
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| the middle slice using either of the following moves |
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| for each of the four segments depending on which is |
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| required. |
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| (i) (UF,RF): U R U- R- U- F- U F |
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| (ii) (UF,FR): F- U2 L- U L U2 F |
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|4. Again using the completed face as the bottom face now |
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| get a cross on the upper face. Do not try to |
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| orientate these downwards at first. Use the following |
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| two moves: |
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| (iii) UB,UF flip (UF,BU,UL): B L U L- U- B- |
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| (iv) UB,UL flip (UF,UL,BU): B U L U- L- B- |
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|5. Now orientate the cross downwards: |
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| (v) (UR,UB): F- U- F U- F- U2 F |
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|6. Get the four corners into their correct positions |
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| using either of the following moves depending on how |
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| the cube has fallen out: |
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| (vi) (UBR,LBU,LUF): U R U- L- U R- U- L |
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| (vii) (UFL,FUR) and (ULB,BRU): |
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| B L U L- U- L U L- U- L U L- U- B |
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|7. Rotate the corners so that they are orientated |
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| properly using the following move: |
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| (viii) (FLU,LUF,UFL) and (FDL,DLF,LFD): |
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| R F R- F R F2 R- L- F- L F- L- F2 L |
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