NNUE: re-fit raw-to-score calibration, NNU4 weight format, super-lazy default-on, lazy probe measured net-negative

Fits an affine (a + b*raw) correction into every exported .nnue file
(export_nnue_weights.py's CalibrateScoreMapping) so the engine's
consumed centipawn output tracks Stockfish's real score scale rather
than the net's nominal raw WDL-sigmoid output -- training variance
alone shifts this mapping across retrains even with an identical
recipe, so it's re-fit and baked in per export rather than assumed
constant. Weight format bumped to "NNU4" to carry the two new floats;
older NNU1/2/3 files are no longer readable.

Super-lazy (material-only) pre-filter promoted to default-on
(g_fUseNnueSuperLazy = TRUE) with a recalibrated per-material-bucket
margin table (measured against the recalibrated net, 16-shard
cross_sectional_200k.ep_ sample) -- real, measured nps win across all
three curated suites. The separate lazy-probe gate (accumulator-based
early exit) is measured net-negative on real search traffic at this
net's probe-vs-forward latency ratio and stays off by default
(g_fUseNnueLazyProbe = FALSE); code kept live since margin tuning
could still flip this, per docs/NNUE.md.

Also: direct per-call latency instrumentation for NnueProbeScore/
NnueForward (root.c, EVAL_TIME build) to make the lazy-probe
breakeven math measurable directly instead of inferred; QSearch
futility margins given real-data-derived NNUE_FULL/NNUE_LAZY
starting points.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

1 files changed, 10 insertions, 2 deletions

diff --git a/src/command.c b/src/command.c
index 1767e98..9808c33 100644
--- a/src/command.c
+++ b/src/command.c
@@ -992,14 +992,22 @@ Return value:
 
     if (!STRCMPI(argv[1], "superlazyon"))
     {
+        // 2026-10-20: margin cp is now optional -- omit it to use
+        // eval.c's calibrated iNnueSuperLazyMarginByMatBucket table
+        // (the normal case); pass one to force a flat override across
+        // every material bucket instead, same convention as
+        // "nnue lazymargin".
         if (argc < 3)
         {
-            Trace("Usage: nnue superlazyon <margin cp>\n");
+            g_iNnueSuperLazyMargin = -1;
+            g_fUseNnueSuperLazy = TRUE;
+            Trace("NNUE super-lazy (material-only) pre-filter enabled, "
+                  "using calibrated per-bucket margin table.\n");
             return;
         }
         g_iNnueSuperLazyMargin = (SCORE)atoi(argv[2]);
         g_fUseNnueSuperLazy = TRUE;
-        Trace("NNUE super-lazy (material-only) pre-filter enabled, margin=%d cp.\n",
+        Trace("NNUE super-lazy (material-only) pre-filter enabled, flat margin=%d cp.\n",
               g_iNnueSuperLazyMargin);
         return;
     }