魔方
记录一下：昨天平生第一次完成六面的魔方，尽管是在书和网页的帮助下，还是很有成就感的。
参考的书是“Speed Solving the Cube: Easy to Follow, Step-by-step Instructions for Many Popular 3-D Puzzles”。在书的帮助下（第16页到第30页）成功地完成了下面两层，到了倒数第二步“Twist the final layer corners”时，总是碰到问题，后来发现书上的这一步有错误。在网上搜到了这两个网页，帮助我完成了最后一层。
https://www.rubiks.com/blog/how-to-solve-the-rubiks-cube-stage-5
https://www.rubiks.com/blog/how-to-solve-the-rubiks-cube-stage-6
感觉像学了一门新的语言。回来有空时再挑战4X4的魔方。也想鼓励小犇有空时挑战自己完成六面的魔方，而不是每次拿给其他小朋友帮助完成六面，然后就不敢动它了。
附录：
https://www.rubiks.com/blog/how-to-solve-the-rubiks-cube-stage-5
SOLVE THE TOP FACE
Holding your cube:
1) Matching the yellow pattern on the top face of your Rubik’s Cube to one of the yellow patterns shown on the Cubes below.
2) Then follow the correct sequence.
Tips:
- Yellow edge pieces on the top face do NOT need to match on the side pieces…yet!
1st Step: Make a yellow cross:
2nd Step: Make all the corners yellow
Now look at the top face of the Rubik’s Cube and match your face to one of the states below:
State 1
If no corner Cubes are yellow on the top face, you must have yellow left corner or left face as shown.
State 2
If one corner Cube is yellow match your top face as shown and do the sequence below.
State 3
If any two corner Cubes are yellow don’t worry about their position. You MUST match the front face with a yellow left corner as shown Do this sequence 1, 2 or 3 times to achieve a complete yellow top face. After each sequence, orient the Rubik’s Cube to REMATCH the top face to the appropriate state and repeat the sequence until all the corners are yellow.
If your Rubik’s Cube looks like this picture above then you can move to Stage 6!
https://www.rubiks.com/blog/how-to-solve-the-rubiks-cube-stage-6
Solve the final layer
Holding the cube
Hold the Rubik’s Cube as shown, now twist the top face until at least 2 corners are in the right location as A, B or A, D or B, C as shown below. If all 4 corners are in the right place you can proceed to the 2nd step.
1st Step: Position yellow corners correctly
While holding your Rubik’s Cube as shown above, look at the top face. Place the 2 correct corners in the back A, B or diagonally A, D or B, C across from each other.
If corners A and B are in the right place then to switch C and D, do the sequence below:
If you need to switch diagonal corners like B and C or D and A, then do the sequence once. Then, orient the Cube so the 2 correct corners are in the back and do the sequence again.
2nd Step: Position yellow edges correctly
If 1 edge is correct and 3 edges are incorrect orient the Rubik’s Cube so the face with the correct edge is the back face. Then determine if the edge pieces need to move clockwise or counter-clockwise and do the correct sequence below.
If all 4 edges are incorrect, then do either sequence below once, and then determine what direction the three edge pieces need to move and do the correct sequence below.
To cycle EFG Clockwise or EFGH Clockwise:
To cycle EFG Counter-Clockwise or EFGH Counter-Clockwise:
Congratulations - You just solved a Rubik's Cube!
