Stockfish 2023121917 NNUE for Windows and Linux, interesting compilation by Michael Chaly (Elo +1.77)

- December 21, 2023

Stockfish 2023121917 - UCI chess engine, compiled by Michael Chaly

Timestamp: 1703006530

Adjust stand pat in qsearch on pv nodes

Instead of immediately returning a fail high do this only at non-pv nodes, for pv nodes adjust bestValue to value between alpha and beta and continue searching. Idea is to do it the same way as it's done in search where we don't return positive beta cutoffs after ttHits / zero window search at PvNodes and instead fully search lines.

Passed STC:

https://tests.stockfishchess.org/tests/view/65739b0af09ce1261f122f33

LLR: 2.94 (-2.94,2.94) <0.00,2.00>

Total: 189216 W: 48142 L: 47598 D: 93476 Elo +1.00

Ptnml(0-2): 584, 22463, 48051, 22845, 665

Passed LTC:

https://tests.stockfishchess.org/tests/view/657701214d789acf40aac194

LLR: 2.94 (-2.94,2.94) <0.50,2.50>

Total: 82506 W: 20689 L: 20269 D: 41548 Elo +1.77

Ptnml(0-2): 56, 9236, 22268, 9618, 75

Two issues had to be resolved:

- in rare cases it set alpha to the same value as beta and thus broke some asserts;

- messed up with returning tb win values.

Fix passed non-regression LTC vs this patch:

https://tests.stockfishchess.org/tests/view/6578113b4d789acf40aad544

LLR: 2.96 (-2.94,2.94) <-1.75,0.25>

Total: 277308 W: 68839 L: 68880 D: 139589 Elo -0.05

Ptnml(0-2): 167, 31580, 75212, 31517, 178

closes https://github.com/official-stockfish/Stockfish/pull/4922

Bench: 1069503

Co-Authored-By: Muzhen Gaming <61100393+>

Co-Authored-By: Shahin M. Shahin <41402573+>

Co-Authored-By: fffelix-huang <72808219+>

Stockfish rating CEDR progress:

Pl	Engine	Rating	Score	Games	%
20	Stockfish 20230227	3752.9	92.00	134	68.66
39	Stockfish ba43fcaff995	3745.4	112.50	159	70.75
40	Stockfish 241022	3745.3	64.00	112	57.14
42	Stockfish 031022	3742.8	110.50	158	69.94
54	Stockfish 070922	3740.2	123.00	164	75.00
58	Stockfish 20230911	3739.7	190.00	324	58.64
64	Stockfish 20230325	3739.1	109.00	169	64.50
67	Stockfish 20221107	3739.0	106.50	186	57.26
73	Stockfish 301022	3738.4	112.00	175	64.00
78	Stockfish 20230218	3737.5	110.50	164	67.38
81	Stockfish 20231008	3737.1	144.50	246	58.74
99	Stockfish 20230128	3735.2	69.00	106	65.09
101	Stockfish 20230813	3734.9	164.50	238	69.12
103	Stockfish 20231014	3734.8	146.00	256	57.03
118	Stockfish 20230525	3733.2	71.00	122	58.20
132	Stockfish 20230903	3731.9	308.50	457	67.51
138	Stockfish 20230711	3731.4	80.50	122	65.98
159	Stockfish 161022	3730.4	147.00	240	61.25
160	Stockfish 20221123	3730.4	247.50	356	69.52
165	Stockfish 20230520	3730.2	106.50	174	61.21
187	Stockfish 20221224	3728.8	65.50	104	62.98
198	Stockfish 20231021	3728.2	90.00	126	71.43
206	Stockfish 20230531	3727.9	61.00	116	52.59
220	Stockfish 23092217	3727.2	91.00	113	80.53
223	Stockfish 16	3727.0	1717.00	2877	59.68
232	Stockfish 20230114	3726.4	295.00	410	71.95