The Combined Rating Lists updated as of October 4, 2015. New combined rating list is "Hybrid Top Selection" extracted from the hybrid PGN database. Surprisingly, Strelka 6 is higher than Houdini 4 in the ranking which maybe caused by not being part of the CCRL/CEGT rating and therefore did not meet the stronger mixed CPU versions. It is strange that CCRL/CEGT did not include this very strong chess engine, which somehow evoke conspiracy theories.
The Hybrid Top Selection did not include the private chess engines which should not belong to the respectable public rating list sites. They should be in private - at home.