Rework check/pawn-push/recapture extension gating on real SEE (GetMoveSee, generalized from GetCheckSee), restrict LMR to leftover moves only, and tighten recapture's window back to 1x after measuring a 6.8x node blowup from sharing the wider window.

Head-to-head match at 1170 games confirms parity with the prior head (score=0.510, LLR still between bounds) -- landing as a neutral-or-better baseline rather than a regression.

1 files changed, 24 insertions, 1 deletions

diff --git a/src/generate.c b/src/generate.c
index a04b4c6..e3db067 100644
--- a/src/generate.c
+++ b/src/generate.c
@@ -4171,6 +4171,21 @@ Return value:
                     pStack->mvf[u].bvFlags |= MVF_SEE_KNOWN |
                         ((s >= 0) ? MVF_SEE_NONNEGATIVE : 0);
                 }
+                else
+                {
+                    // s > 0 here: the captured piece is worth strictly
+                    // more than the piece making the capture. The real
+                    // SEE(pos, mv) is mathematically guaranteed >= this
+                    // material floor (the side to move can always stop
+                    // the exchange right after this capture), so its
+                    // sign is already known to be nonnegative without
+                    // paying for the actual exchange walk -- avoids a
+                    // later GetMoveSee() cache miss (and a redundant
+                    // SEE() call) on exactly the most common "good
+                    // capture" case.
+                    pStack->mvf[u].bvFlags |= MVF_SEE_KNOWN |
+                        MVF_SEE_NONNEGATIVE;
+                }
 
                 if (s >= 0)
                 {
@@ -4384,7 +4399,15 @@ Return value:
                     pStack->mvf[u].bvFlags |= MVF_SEE_KNOWN |
                         ((s >= 0) ? MVF_SEE_NONNEGATIVE : 0);
                 }
-                
+                else
+                {
+                    // Same reasoning as _ScoreAllMoves' identical
+                    // shortcut: s > 0 here is a guaranteed floor on the
+                    // real SEE, so its sign is already known.
+                    pStack->mvf[u].bvFlags |= MVF_SEE_KNOWN |
+                        MVF_SEE_NONNEGATIVE;
+                }
+
                 if (s > 0)
                 {
                     // Winning captures: take with pieces before with king