Chess engine: Viridithas 11.0.0

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Chess engine: Viridithas 11.0.0

Chess engine: Viridithas Author:Cosmo

Rating CEDR=3523

v.11.0.0:

This version of Viridithas has been playing at TCEC and CCC during development, scoring (in my opinion) very respectably. At TCEC, Viridithas made it all the way to League 1, before being relegated back to League 2. At CCC, Viri almost made it to the CCC21 Rapid Main round, but unfortunately lost a tiebreaker for promotion to @lucametehau's excellent Clover.

Upgrades

Use more clock time. (4.12 +- 2.93) (#68)

Add support for HalfKA feature-set for NNUE. (7.67 +- 4.38) (#70)

Cache static evaluation in TT entries. (5.86 +- 3.68) (#71)

Fix the way nodes-searched is reported when SMP is on. (#73)

When using SMP, perform initialisation of the transposition table in parallel. (#74)

More singular extensions (7.70 +- 4.28) (#76)

Even more singular extensions. (1.50 +- 2.06) (#78)

Switch from HalfKA 768x2 network to 1024x2 relnet. (16.13 +- 8.95) (#79)

Index the main history table using threats on the from/to squares. (9.53 +- 4.96) (#80) - thanks @Ciekce!

Switch from 1024x2 relnet to 1536x2 relnet. (1.98 +- 1.60) (#82)

More smoothly adjust aspiration windows as depth increases. (2.35 +- 1.90) (#84)

Elo comparison against v10.0.0

STC:

ELO | 37.34 +- 8.88 (95%)

CONF | 8.0+0.08s Threads=1 Hash=16MB

GAMES | N: 3008 W: 928 L: 606 D: 1474

https://chess.swehosting.se/test/3912/

LTC:

ELO | 42.95 +- 15.09 (95%)

CONF | 60.0+0.60s Threads=1 Hash=128MB

GAMES | N: 1000 W: 305 L: 182 D: 513

https://chess.swehosting.se/test/3915/

FRC:

ELO | 90.10 +- 9.11 (95%)

CONF | 8.0+0.08s Threads=1 Hash=16MB

GAMES | N: 3008 W: 1179 L: 416 D: 1413

https://chess.swehosting.se/test/3913/

FRC gains are (as usual) due to the inclusion of greater quantites of DFRC data in the training set.

Thanks as always to everyone who helps me out with viri's development, especially everyone on https://chess.swehosting.se, you're a great bunch.

Binaries are separated by the microarchitecture levels. Most people should use v3!

v1 is supported on all x86-64 CPUs.

v2 has POPCNT, SSE3, etc.

v3 has AVX2, BMI, LZCNT, etc.

v4 has AVX512.

If you're on older AMD hardware with slow BMI2, I don't currently have a good binary for you, apologies.

Viridithas 11.0.0 download

Rating CEDR progress:

Pl	Engine	Rating	Score	Games	%
584	Viridithas 10.0.0	3523.1	246.50	404	61.01
592	Viridithas 9.1.0	3516.3	215.50	378	57.01
624	Viridithas 9.0.0	3465.9	303.00	550	55.09
690	Viridithas 8.1.0	3353.8	114.00	254	44.88
758	Viridithas 6.0.0	3257.4	118.00	323	36.53
763	Viridithas 7.0.0	3251.8	126.50	484	26.14
808	Viridithas 5.1.0	3180.3	117.00	279	41.94
857	Viridithas 5.0.0	3099.4	15.00	168	8.93
923	Viridithas 4.0.0	3030.3	71.50	148	48.31
941	Viridithas 3.0.0	2992.8	40.50	93	43.55
1018	Viridithas 2.6.0	2872.4	161.00	313	51.44
1100	Viridithas 2.4.3	2751.4	5.00	26	19.23
1122	Viridithas 2.5.0	2723.1	19.50	108	18.06
1338	Viridithas 2.4.2	2366.2	1.00	54	1.85

Comments

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