I simply wimped out, being unable to predict the LMR/zugzwang/etc issues. I now use max iteration = 2 * mate + 5. Once it finds the mate, the iterations whiz by quickly, and this seems to catch most of the "find the shortest mate" issues by searching 4 plies deeper than would be needed if there was no LMR issues...
It means nothing for Elo, as you said...
Early search termination
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bob
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