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After some serious computations I have found the following parity algs for 4x4 solved using the reduction method. The algs should be the shortest possible using only R, Rw & U while preserving the lower layers. The move count is higher than the well known parity alg, but this might still be...

In Sweden we are at the moment running a school championship. This is a (inofficial) competition for kids in grades 7-12. In total we had 200 competitors in the qualification competitions organized by the schools. Of those the top 25 has qualified for the national final that will be held on...