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search.c changes to restore (both trivial one-liners):
1. Near `iInitialAlpha = iAlpha;` (right after it), add:
pi->fPvNode = (iBeta != iAlpha + 1);
2. OPTIONAL -- only if resuming "isolate LMR's effect alone" testing
methodology (i.e. you want LMR-only numbers uncontaminated by
futility pruning again). If instead you want to test LMR *combined*
with futility (recommended next step per yesterday's session), skip
this and leave futility on as it is in the clean baseline.
Find the futility-pruning block:
ASSERT(!uFutilityMargin);
if ((iRoughEval + VALUE_ROOK <= iAlpha) &&
(uDepth <= TWO_PLY) &&
...
and disable it for isolation testing:
ASSERT(!uFutilityMargin);
if (FALSE && // temporarily disabled to isolate graded-LMR's
// effect in isolation during testing
(iRoughEval + VALUE_ROOK <= iAlpha) &&
(uDepth <= TWO_PLY) &&
...
Everything else in search.c (the GetLMRReduction call site, the
re-search-add-back using `uNextDepth -= iExtend`) is already generic
and needs NO changes -- it was written to work with any reduction
magnitude GetLMRReduction returns, so it already works correctly with
both the baseline's fixed -ONE_PLY and the graded version.
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