🚀 go-pugleaf

In the version of UChess I have, I do the same thing
that Kong Sian does with lookahead, and I found one problem.
If on lookahead you get a book move, thinking on opponents time,
you need to set Sdepth to 0 and forget that lookahead worked,
or things get confused, since the pgm will think you
got some ply in the lookahead, put the fix in before
you return from iop == 2 in search, to set Sdepth to 0.

Also I found it NOT useful to keep thelookahead precalc
unless Sdepth is >2 when you return in the iop == 2 clause.

-Roger
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bix: ruzun
NET: uzun@crash.cts.com