optional-eval-in-check vs master @ 8.0+0.08

Configuration

Author	Nocturn9x
Variant	standard
Creation	1792518608
Dev Source	https://github.com/nocturn9x/heimdall
Dev SHA	126e7b47fcaf05ae3727b41270ce89404257eb0c
Dev Branch	optional-eval-in-check
Dev Bench	5401484
Dev Avg NPS	—
Dev Network	tyrfing
Dev Options	Threads=1 Hash=16
Dev Time	8.0+0.08
Base Source	https://github.com/nocturn9x/heimdall
Base SHA	a010d9ec3b285981577b83d78a68c2f4a0e705da
Base Branch	master
Base Bench	5551733
Base Avg NPS	—
Base Network	tyrfing
Base Options	Threads=1 Hash=16
Base Time	8.0+0.08
Opening Book	UHO_Lichess_4852_v1.epd
Upload PGNs	FALSE
Syzygy WDL	DISABLED
Syzygy ADJ.	OPTIONAL
Win ADJ.	movecount=8 score=800
Draw ADJ.	movenumber=32 movecount=10 score=0
Scaling	BASE 910000 NPS

optional-eval-in-check vs master

Approve Restart Delete

Name  | optional-eval-in-check
Elo   | -25.92 +- 9.96 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | -1.64 (-2.25, 2.89) [0.00, 3.00]
Games | N: 1316 W: 276 L: 374 D: 666
Penta | [14, 193, 331, 117, 3]

LLR history

Info

Guard search heuristics and skip static evaluation in check (bench 5401484)
Checked nodes carry noEval through the search stack and TT. Main-search
futility pruning and the fail-low extension after a reduced parent search
previously consumed static eval in check; require present evaluations before
using them. Guard improving, reverse futility, null move and correction-history
arithmetic likewise, and compute TT-adjusted eval only where needed.
Disable qsearch stand pat when static eval is absent. Preserve capture-only
move generation and SEE pruning here; full check evasions and qsearch mate
recognition are isolated in a follow-up commit. Until then, checked qsearch
nodes with no searched capture retain -SCORE_INF.
At the hard ply boundary, return a neutral score in check instead of evaluating.
Enforce the rawEval precondition with doAssert, including in danger builds.
Subprocess tests verify this invariant and absent-eval unwrapping survive there.
Validation: focused AVX2 checked/danger and scalar checked tests; exhaustive
optional-eval/TT round trips and unchanged layouts; Python suite (99 run,
5 skipped). Optimized depth-13; depth 14 visited 8078278 nodes.
Twelve alternating depth-14 pairs on CPU 2 versus the representation-only
commit show -1.25% throughput change, 95% bootstrap interval
[-7.32%, +3.49%]. Search trees differ, so this measures throughput rather
than identical work or playing strength.
Co-authored-by: GPT 6 <codex@openai.com>

Priority

Throughput

Workload size

#	User	Games	Wins	Draws	Losses	LL	LD	DD / WL	DW	WW	Pairs	Time	Crash

Errors

Time	Worker	User	Error	Logs
No errors