New engine releases & news 2021

[ydebilloez]

Belofte 2.1.2 released on 32/64 bit linux/windows/mac.

• Slight improvement over 2.1.1 (and its never released fix 2.1.1.2). Elo difference about 100, but given past experience with 2.1.1 release, lets wait confirmation from CCRL lists.

• No longer segfault on MacOS X on exit.

• No longer stops sometimes on move 256, lets hope this fixes the issue some have seen on move 64 or 128.

• Some primary endgame evaluation.

• Movelist generation and other speedups.

Other changes, see README.md.

[Modern Times]

Stashs' 30th birthday release

Stash 30.0 released
https://gitlab.com/mhouppin/stash-bot/-/releases

I'm getting +20-25 Elo from this in chess960 testing.

[bastiball]

Bagatur 2.2c


https://github.com/bagaturchess/Bagatur ... e.2.2c.zip

[jhonnold]

Berserk 4.1.0 is out now.

Minor evaluation and search changes. Most significant changes are NPS improvements and a major bug fix that is present in release 4.0.0.

Downloads available here: https://github.com/jhonnold/berserk/releases/tag/4.1.0

[Gabor Szots]

Belofte 2.1.2 released on 32/64 bit linux/windows/mac.

Thanks Yves. On my 64-bit Win10 PC the 32-bit exe runs faster than the 64-bit one so that is what I am using.

[Modern Times]

Just released Cheng 4.41
link: http://vlasak.biz/cheng

the improvement is modest this time (I'm playing with fire - no pun intended , estimated +15 against other engines (about half of 4.40 vs 4.39)
(self-play hyperbullet 56% against 4.40 so who knows, I usually get about half of self-play) - my apologies to the testers for not jumping hundreds of Elo points

+55 Elo in my chess960 testing:

http://ccrl.chessdom.com/ccrl/404FRC/cg ... _length=30

Needs more games, but unlikely to change too much.

[mar]

+55 Elo in my chess960 testing:

http://ccrl.chessdom.com/ccrl/404FRC/cg ... _length=30

Needs more games, but unlikely to change too much.

thanks Ray, that's way more than I expected to be honest. glad to see that I finally broke 3k in CCRL FRC - means a lot to me

unfortunately I found some bugs after the release, but they don't seem to impact the strength (aspiration window overflow when close to mate, score ocillations in fine #70, failure to resolve some mates). fixing them might impact strength in theory though - so I'll probably keep the release as is

[lucametehau]

Took me some days, but I managed to get something working and now Clover 2.2 is here. Mostly, I just added a safecheck evaluation term and retuned all of them on lichess-quiet positions.

Download link: https://github.com/lucametehau/CloverEngine .

[Damir]

Invictus by Edsel Apostol released:

https://github.com/ed-apostol/InvictusC ... s/tag/r323

[Guenther]

Invictus by Edsel Apostol released:

https://github.com/ed-apostol/InvictusC ... s/tag/r323

If there is interest (enough) I will upload one or two flavours for older hardware.
I have already compiled one for me. Time to depth for more threads seems quite improved.
(even noticable on my hardware compared to r305 nopopcount release)

Note that default for Threads for r323 is 8!
(so below output is for 4 threads = max of my machine)

Code: Select all

Invictus r323
Copyright (C) 2021 Edsel Apostol
Use UCI commands

uci
id name Invictus r323
id author Edsel Apostol
option name Hash type spin default 256 min 1 max 65536
option name Threads type spin default 8 min 1 max 4096
option name Ponder type check default false
option name ABDADA Depth type spin default 3 min 1 max 128
option name Cutoff Check Depth type spin default 4 min 1 max 128
option name NUMA type check default false
uciok
ucinewgame
go infinite
info depth 8 seldepth 11 score cp 35 time 11 nodes 6237 nps 567000 pv b1c3 b8c6 g1f3 g8f6 d2d4 d7d5 c1f4 f6e4
info depth 9 seldepth 12 score cp 7 time 209 nodes 1537438 nps 7356162 pv b1c3 b8c6 d2d4 d7d5 g1f3 g8f6 f3e5 c8f5 c1g5
info depth 10 seldepth 15 score cp 31 time 222 nodes 1573711 nps 7088788 pv b1c3 b8c6 d2d4 d7d5 g1f3 g8f6 c1f4 c8f5 h2h3 f6e4
info depth 11 seldepth 15 score cp 8 time 325 nodes 2268278 nps 6979316 pv b1c3 d7d5 d2d4 g8f6 c1f4 f6h5 f4d2 h5f6 g1f3 b8c6 d2f4
info depth 12 seldepth 16 score cp 18 time 337 nodes 2295494 nps 6811554 pv b1c3 d7d5 d2d4 g8f6 h2h3 b8c6 g1f3 f6e4 c1f4 c8f5 g2g4 e4c3 b2c3
info depth 13 seldepth 19 score cp 13 time 376 nodes 2385697 nps 6344938 pv e2e4 b8c6 g1f3 g8f6 b1c3 d7d5 e4d5 f6d5 f1b5 c8f5 e1g1 d8d6 c3d5 d6d5
info depth 14 seldepth 22 score cp 36 time 608 nodes 2918356 nps 4799927 pv e2e4 b8c6 g1f3 e7e5 b1c3 g8f6 d2d4 e5d4 f3d4 d7d5 d4c6 b7c6 e4e5 f6e4
info depth 15 seldepth 22 score cp 25 time 864 nodes 3489941 nps 4039283 pv b1c3 b8c6 g1f3 d7d5 d2d4 g8f6 c1f4 c8f5 f3e5 c6e5 d4e5 f6e4 c3e4 d5e4 h2h3 e7e6
info depth 16 seldepth 24 score cp 30 time 1590 nodes 5103955 nps 3210034 pv e2e4 e7e5 g1f3 g8f6 b1c3 b8c6 d2d4 e5d4 f3d4 f8b4 f2f3 e8g8 c1f4 f8e8 d4c6 b7c6 a2a3
info depth 17 seldepth 21 score cp 30 time 1742 nodes 5430078 nps 3117151 pv e2e4 e7e5 g1f3 g8f6 b1c3 b8c6 d2d4 e5d4 f3d4 f8b4 f2f3 e8g8 c1f4 f8e8 d4c6 b7c6 a2a3
info depth 18 seldepth 24 score cp 36 time 2379 nodes 6823967 nps 2868418 pv e2e4 e7e5 g1f3 g8f6 b1c3 b8c6 d2d4 e5d4 f3d4 f8c5 c1e3 c5d4 e3d4 d8e7 f1e2 e8g8 c3d5 f6d5 e4d5
info depth 19 seldepth 29 score cp 39 time 6957 nodes 16859943 nps 2423450 pv e2e4 b8c6 g1f3 e7e6 b1c3 d7d5 d2d4 d5e4 c3e4 d8d5 e4c3 f8b4 f1d3 g8f6 c1e3 d5a5 e1g1 b4c3 b2c3 a5c3
info depth 20 seldepth 27 score cp 39 time 7685 nodes 18442561 nps 2399812 pv e2e4 b8c6 g1f3 e7e5 b1c3 g8f6 d2d4 e5d4 f3d4 f8b4 f2f3 e8g8 a2a3 b4d6 c1e3 d6e5 f3f4 e5d4 e3d4 c6d4 d1d4
info time 13719 nodes 31549763 nps 2299713
info depth 21 seldepth 31 score cp 22 time 21399 nodes 48099894 nps 2247763 pv e2e4 e7e5 g1f3 b8c6 f1c4 f8d6 e1g1 g8f6 d2d3 e8g8 a2a4 c6a5 b1c3 a5c4 d3c4 f8e8 c1g5 d6f8 c3d5 c7c6 g5f6 g7f6
info time 25317 nodes 56138564 nps 2217425