From 917bf1260ae217bdcbdbc11c2c37cdb5d3a8eae9 Mon Sep 17 00:00:00 2001 From: Scott Gasch Date: Sat, 29 Aug 2026 00:30:53 -0700 Subject: Switch to Crafty-style killer ordering; fix mvNullmoveRefutations type-mixing bug and add a quiet-refutation killer backfill. Killer tiers now try both of this ply's own killers before either ply-2-back one, matching Crafty's ordering. Two earlier attempts at this same swap were reverted for regressing; this pass lands on top of NumLeftoverMovesToSelect (more SelectBestWithHistory budget to reach these lower-tier slots) and a real bug fix below, and beats interleaved order head-to-head on solves, node count, and first-move beta cutoff across the three curated suites. The bug: mvNullmoveRefutations's empty-killer-slot backfill could only ever contain a capturing move (TryNullmovePruning only wrote it inside the capture-refutation branch), but IS_SAME_MOVE's mask includes the pCaptured bits, so that backfilled value could never match a real quiet candidate -- the backfill was silently dead code. Fixed by recording genuinely quiet null-move refutations into a new, separate mvNullmoveQuietRefutations array (kept separate so it can't clobber the capture history mvNullmoveRefutations still needs for the Botvinnik-Markoff same-piece-two-squares extension check) and backfilling the regular killer table from that instead. The check-evasion killer table intentionally does *not* get this backfill: a null-move refutation can never legitimately be an escaping-check move (null moves can't deliver check), so backfilling there risks IS_SAME_MOVE cross-context false positives instead of the old guaranteed-inert no-op. Measured at sd10 across ecm_ringers/ecm_confident_quick/ecm_hard_quick against head_reference (commit d11e973): 115/191 solves (vs. 116 baseline), 924.36M total nodes (vs. 933.23M), first-move beta cutoff within 0.1-0.9 points of baseline on all three suites -- and clearly better than the same fix under interleaved order (113/191 solves, 963.10M nodes), which loses to head_reference on every metric. Co-Authored-By: Claude Sonnet 5 Claude-Session: https://claude.ai/code/session_01EortUUkDVpsfrbqshBJYJg --- src/large.bin | Bin 255229596 -> 0 bytes 1 file changed, 0 insertions(+), 0 deletions(-) delete mode 100755 src/large.bin (limited to 'src/large.bin') diff --git a/src/large.bin b/src/large.bin deleted file mode 100755 index 3212478..0000000 Binary files a/src/large.bin and /dev/null differ -- cgit v1.3