From: michael reid To: cube-lovers@ai.mit.edu, randall@theory.lcs.mit.edu Subject: Re: God's Number keith randall writes > Don Dailey, Aske Plaat, and myself have a program that will do a > complete 22-ply search in about 24 hours on an 8 processor Sun > machine. The program measures distance in the QT (quarter-turn) > metric. wow, that's quite a bit faster than my optimal solver! how about searches through other depths (20q, 21q, 23q, ... )? does the run time depend upon the input position? could you describe your searching algorithm? i'm sure that this would be of interest to many people on the cube-lovers mailing list. > By the way, below are solutions and depths for all of the symmetric > cubes enumerated by Hoey and Saxe in their message of Sun, 14 Dec 80. i already posted data for these positions, but it's always nice to have confirmation. however, ... > 22 girdleflip * pons asinorum > F F U L F L' D' R L' U' L L U U R F' B D' F' U R' D' this is solvable in 18q: ) 3. U R U' F D R L' B' L' F R F B' U' L' D B' D' (18q, 18f) although i gave it in a different orientation. > 22 plummer * six-H * superflip > F U D F' R L F U D R R L L B' U D F' R L B' R' L there's a slight typo here; the last twist should be L' . mike ------------------------------ End of Cube-Lovers Digest *************************