1 files changed, 16 insertions, 1 deletions
diff --git a/src/search.c b/src/search.c
index 1b83891..25318ed 100755
--- a/src/search.c
+++ b/src/search.c
@@ -1249,7 +1249,22 @@ QSearchFromCheckNoStandPat(IN SEARCHER_THREAD_CONTEXT *ctx,
         if ((pf->uQsearchDepth < pf->uQsearchCheckDepth) &&
             (pf->uQsearchDepth < g_uIterateDepth / 4) &&
             (pf->fCouldStandPat[pos->uToMove] == FALSE) &&
-            (CountKingSafetyDefects(pos, pos->uToMove) > 2))
+            //
+            // Threshold doubled 2026-09-06 (board_representation/
+            // EVAL.md section 9): was ">2", tuned against the old
+            // CHECK_VECTOR-based CountKingSafetyDefects. The bitboard
+            // rewrite (real blocker-aware slider attacks, queen 2x
+            // weighting) runs systematically hotter for the same
+            // underlying danger, so the un-rescaled old threshold was
+            // firing far more liberally than intended -- observed
+            // directly as a runaway check-extension cascade (85x+
+            // branching for a single ply) on a real position. Not yet
+            // independently recalibrated against real data the way
+            // iKingSwingP90 was; doubling is a stopgap matching the
+            // rough inflation this counter picked up, pending a real
+            // measurement.
+            //
+            (CountKingSafetyDefects(pos, pos->uToMove) > 4))
         {
             if ((uMoveCount == 1) ||
               (NUM_KING_MOVES(ctx, ctx->uPly) == 0) ||