Author: Ian

Release Date: 2024-12-30
Language(s): C#
Repo Owner: Dragjon
Repo URL: https://github.com/Dragjon/Nectar

Score of NectarV0.2.2 vs NectarV0.2.1: 151 - 63 - 40  [0.673] 254
...      NectarV0.2.2 playing White: 74 - 28 - 25  [0.681] 127
...      NectarV0.2.2 playing Black: 77 - 35 - 15  [0.665] 127
...      White vs Black: 109 - 105 - 40  [0.508] 254
Elo difference: 125.6 +/- 41.5, LOS: 100.0 %, DrawRatio: 15.7 %
SPRT: llr 2.96 (100.7%), lbound -2.94, ubound 2.94 - H1 was accepted

https://github.com/Dragjon/Nectar/releases/download/V0.2.2/NectarV0.2.2-linux.zip
https://github.com/Dragjon/Nectar/releases/download/V0.2.2/NectarV0.2.2.zip
https://github.com/Dragjon/Nectar/archive/refs/tags/V0.2.2.zip

I’ve made many attempts now to create the perfect Python script for SF commits (via ChatGPT, of course), and finally realized that the problem was that almost everything necessary is already at Abrok. Official builds are over at the official site anyway. But all the commits are here, going back to 2018 or so. Here is a list of those commits, with direct links to the executables.

https://www.mediafire.com/file/7rh4g77afn5tjd2/stockfish-data-241229.txt/file

Author(s): Paolo Iommarini (ITA)
Release Date: 2024-12-29
Language(s): C#
Repo Owner: sakya
Repo URL: https://github.com/sakya/corechess

CoreChess is an open source chess GUI for chess engines.

  • Human vs Engine mode
  • Human vs Human mode.
  • Engine vs Engine mode.

Supported engines

Upgraded avalonia to v11.2.3

https://github.com/sakya/corechess/releases/download/0.18.4.0/CoreChess_setup_0.18.4.0.exe
https://github.com/sakya/corechess/archive/refs/tags/0.18.4.0.zip

Author(s): Semih Özalp (AUT)
Release Date: 2024-12-28
Language(s): C++
Repo Owner: h1me01
Repo URL: https://github.com/h1me01/Astra

Release Notes

History Updates

  • Added 6-Ply Continuation History
  • Added Capture History
  • Added Correction Histories
  • Improved overall move history tracking and updating

Search Improvements

  • Removed Check Extension
  • Improved static evaluation
  • Added history pruning
  • Improved null move pruning
  • Improved singular extension
  • Improved late move pruning
  • Improved delta pruning in quiescence search

Miscellaneous

  • Introduced a new, more flexible move generation
  • More efficient move picker

https://github.com/h1me01/Astra/releases/download/4.1/astra-4.1-avx2.exe
https://github.com/h1me01/Astra/releases/download/4.1/astra-4.1-avx512.exe
https://github.com/h1me01/Astra/releases/download/4.1/nn-768-2×1024-1.nnue
https://github.com/h1me01/Astra/archive/refs/tags/4.1.zip

Author(s): Volodymyr Shcherbyna (UKR)
Release Date: 2024-12-28
Languages: C/C++
Repo Owner: vscherbyna
Repo URL: https://github.com/vshcherbyna/igel

What’s new:

  • extend by 2 in singular extension on non pv move
  • improve low bound condition in singular extension
  • check beta score in probcut condition
  • store in TT in standing pat in qsearch
  • implement iid
  • tune null move depth
  • tune razor depth
  • remove instant moves handling

Regression run against Igel 3.5.0:

Long Time Control With Increment (60s+0.6s)

Elo   | 21.28 +- 3.60 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 8860 W: 2461 L: 1919 D: 4480
Penta | [7, 798, 2299, 1298, 28]

Short Time Control With Increment (10s+0.1s)

Elo   | 20.07 +- 3.21 (95%)
Conf  | 10.0+0.10s Threads=1 Hash=8MB
Games | N: 13918 W: 3953 L: 3150 D: 6815
Penta | [76, 1392, 3306, 2023, 162]

https://github.com/vshcherbyna/igel/releases/download/3.6.0/igel-x64_bmi2_avx2_3_6_0.exe
https://github.com/vshcherbyna/igel/releases/download/3.6.0/igel-x64_popcnt_avx2_3_6_0.exe
https://github.com/vshcherbyna/igel/archive/refs/tags/3.6.0.zip

Created from the combined CCRL that I have on this site. That means the engine ratings are from that list — though it was designed to adhere closely to the actual CCRL. One feature of that list is that all the extraneous information is removed from the engine names. Meaning if an engine is listed as, say, “Stockfish 15 avx2 4CPU” or something like that, it was first changed to “Stockfish 15” before the rating list was made. As a consequence, all the engine names here are also just the plain engine name and the version number/name. So you’d have to make those changes first to whatever PGN you were adding ratings to.

Just load this into Scid via Options — Resources…, or into Scid vs. PC via Options — Load Spellcheck File. It then works like a normal SSP ratings file.

https://www.mediafire.com/file_premium/8e42fx5tqor44c9/engines.ssp/file

Release Date: 2024-12-28
Language: C
Repo Owner: Jakob256
Repo URL: https://github.com/Jakob256/PurplePanda

Score against Version 18: 64% (+100 Elo)

  • moveordering refactored and considers “defended by a pawn” for own pieces
  • if depth2go>=4 and no hashmove is available, a shallow search is used to find the most promising move
  • beta-pruning at depth2go=1,2,3 with margins 0cp, 250cp and 500cp
  • 4 captures extend the search by 2 ply
  • repetition detection: if a position occures twice in the search tree, it is evaluated as drawn

https://github.com/Jakob256/PurplePanda/releases/download/v19/PurplePanda19.exe
https://github.com/Jakob256/PurplePanda/archive/refs/tags/v19.zip

These are just like the previous set of engine games, in that no player is rated below 2300, and no game has less than 10 moves or more than 150. Each game also has a high-enough beauty score in ChessBase that it has three out of three medals. This represents about 2% of the original database. All games have opening tags, ply count, beauty scores, evaluations, and novelty annotations.

All 45,074 games:
https://www.mediafire.com/file_premium/colmw3dj6wgxtvn/artemis-ccrl-4015.pgn/file

Author(s): Rei Meguro (USA)
Release Date: 2024-12-27
Language: C++
Repo Owner: Orbital-Web
Repo URL: https://github.com/Orbital-Web/Raphael

  • Used GediminasMasaitis’s Texel Tuner to tune evaluation parameters
  • Switched to fully tapered evaluation (not just a select few parameters)
  • Added bishop-colored corner distance boost
  • Added bishop pair bonus
  • Added early draw evaluation evaluation scaling to avoid premature captures that result in draws

ELO Increase: 118

https://github.com/Orbital-Web/Raphael/releases/download/v1.8.0/Raphael1.8.0.0.exe
https://github.com/Orbital-Web/Raphael/archive/refs/tags/v1.8.0.zip

“Artemis” games are games that are considered strong (2300+ and 10+ moves) and most beautiful (meaning three medals for beauty in ChessBase 17 or 18). These are the engine games that I ran for the FDRL (the Fixed Depth Rating List) and the CERL (the Chess Engine Rating List). Games have openings, evaluations, beauty scores, and novelty annotations.

All 25,647 games:
https://www.mediafire.com/file/536s0dvuv2698kp/artemis-chess-nerd.pgn/file

All 20,669 games:
https://www.mediafire.com/file_premium/mf688hcfutg460g/chess-tournaments-2024-06.pgn/file

This is combined from TWIC, Chesscom Events, and Chess Results:
https://theweekinchess.com/twic
https://www.chess.com/events/results
https://chess-results.com/partieSuche.aspx?lan=1

Doubles and non-standard games are removed. Everything here qualifies in ChessBase as a strong game, i.e. at least 10 moves, and with ratings 2300+. Openings, evaluations, beauty scores, and novelty annotations are added.

All 20,198 games:
https://www.mediafire.com/file/s7vp113612yhnct/chess-tournaments-2024-09.pgn/file

This is combined from TWIC, Chesscom Events, and Chess Results:
https://theweekinchess.com/twic
https://www.chess.com/events/results
https://chess-results.com/partieSuche.aspx?lan=1

Doubles and non-standard games are removed. Everything here qualifies in ChessBase as a strong game, i.e. at least 10 moves, and with ratings 2300+. Openings, evaluations, beauty scores, and novelty annotations are added.

All 18,324 games:
https://www.mediafire.com/file/7tiyloxt2uxra3m/chess-tournaments-2024-11.pgn/file

This is combined from TWIC, Chesscom Events, and Chess Results:
https://theweekinchess.com/twic
https://www.chess.com/events/results
https://chess-results.com/partieSuche.aspx?lan=1

Doubles and non-standard games are removed. Everything here qualifies in ChessBase as a strong game, i.e. at least 10 moves, and with ratings 2300+. Openings, evaluations, beauty scores, and novelty annotations are added.

All 24,437 games:
https://www.mediafire.com/file/dk0pua9r2qlr48b/chess-tournaments-2024-07.pgn/file

This is combined from TWIC, Chesscom Events, and Chess Results:
https://theweekinchess.com/twic
https://www.chess.com/events/results
https://chess-results.com/partieSuche.aspx?lan=1

Doubles and non-standard games are removed. Everything here qualifies in ChessBase as a strong game, i.e. at least 10 moves, and with ratings 2300+. Openings, evaluations, beauty scores, and novelty annotations are added.