I borrowed this idea from GNU Go with good results: on my test suite it was almost as quick as 3-lib-alive search, but allowed it to solve many problems that start out with 3-liberties but quickly turn into ladders (such as loose ladders and nets).Do you use a depth cutoff beyond which strings with 4 liberties are considered tactically stable? GNU Go currently uses 7 at the default level 10.
This depth cutoff is relative to the full-board position we are analyzing, i.e. if we are at depth 4 in life-and-death reading and call out to the tactical reading, it will only read 3 plys with 5 liberties at the safety cutoff. I didn't get around to making the same experiment with GNU Go but that's why I don't expect it to be a drastic speed improvement.
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