Chess Engines Diary

  Zahak - UCI chess engine written in Go.  Author: Amanj Sherwany v.2.0.0 Getting rid of multi-cut Adding Aspiration Window Adding Late Move Pruning Tweaking pruning parameters Removing Extended Futility Pruning Adding Futility Pruning in Quiescence Search Fixes in UCI protocol Zahah 2.0.0 download

  Temp 3'+3" Lenovo Ideapad 330, i3-8130U, 12GB GUI  Arena 3.5.1 Book  Perfect 2021 All JCER games 94 .482 Table:  Scid vs PC JCER Test Tournament:   182 games

  Temp 3'+3" Intel Core i7 7,9 GB GUI  Fritz 17 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER Test Tournament:   182 games

  Temp 3'+3" Intel Core i7 7,9 GB GUI  Fritz 17 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER Temp Tournament:   132 games

Clover - UCI chess engine Author: L uca Metehau Clover is a chess engine, written in C++, inspired by my favorite plant. Since the 2020 lockdown, I got bored and decided to combine the 2 things I love the most: chess and programing, into making a program that can beat me. Clover 2.1.2.1 download

Igel - UCI chess engine, Rating JCER=2932   (12 place)  Author : Volodymyr Shcherbyna (Fork of GreKo 2018.01) 3.0.5 news ------------- Train a new network using Igel 2.6.0 (HCE), Igel 2.9.0 (NNUE) and Igel 3.0.0 (NNUE) data: ign-1-d593efbd Better time management in sd time control Skip tt cutoff for null moves in search Skip null move prunning on tt hit Vote for best thread in SMP mode Less aggressive time use in non repeated tc Igel 3.0.5 - download

  Temp 3'+3" Intel Core i7 7,9 GB GUI  Arena 3.5.1 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER League Tournament:   132 games

Fire - UCI chess engine, Rating JCER=2950 author compilation - Norman Schmidt v.8.11 this is a feature-only release w/no change in playing strength UCI option SearchType random w/ uniform_real_distribution & mesenne twister engine NDEBUG asserts tested and tweaked void position::init() zobrist now gets random seed using std::chrono::system_clock Fire 8.11 download

MinimalChess as an engine to an UCI compatible Chess GUI. Author: L ithander Version 0.4 Version 0.4 now uses tapered Piece-Square tables to evaluate positions. It took two weeks of tuning and testing until I finally managed to find values that could rival PeSTOs famous PSTs in strength. Version 0.4 also introduces a killer heuristic and staged move generation. A new time control logic is spending the allocated budget smarter, especially in modes where there's an increment each move. These changes provide a considerable boost in playing strength to approximately 1900 ELO without making the code any less simple and minimal: Version 0.4 has seen a lot of refactoring and even lost a few lines of (executable) code compared with Version 0.3. Minimal 0.4 download

Berserk - UCI chess engine (  written in C). Author:  Jay Honnold  Rating JCER=2794 v.4.1.0. Candidate Passed Pawns Various NPS Improvements (22% increase!) Caching "special piece" bitboard Incremental material updates Pawn hash tables PEXT support Pawn threats QS modified to rely purely on SEE scoring Credit to Halogen's author for this idea Syzygy Tablebase support added Using Andrew Grant's Pyrrhic Berserk 4.1.0 download

Author: Connor McMonigle  This release adds around +120 elo in self play over v1.2.1. Limited testing indicates that slightly more elo can be expected against other opponents. Additionally, the reported NPS should be slightly increased relative to v1.2.1. The embedded network is trained entirely on data generated by Seer's search starting with a randomly initialized network. The network is no longer directly or indirectly trained on Stockfish derived training data. The training technique employed is a variant of semisupervised learning and involves starting with a large number of <=6 man positions labeled using Syzygy EGTBs. Seer 2.0.0 download

P Engine JCER Score Lc Ig Ha Chg +/-/= 1: Lc0 0.27.0 2900 2.5 / 4 XX =0 11 +4 (+2 -1 =1) 2: Igel 3.0.0 2932 2.0 / 4 =1 XX =0 -4 (+1 -1 =2) 3: Halogen 10 2823 1.5 / 4 00 =1 XX +0 (+1 -2 =1) GUI - Banksia, Games download ,   HP Pavilion, i5-1035G1, 8GB RAM

Stockfish - UCI chess engine, compiled by Lonfom169 Rating JCER=3157 Timestamp: 1619349982 More extensions if SE search is very low. More extensions for non-PV nodes if value from singular extension search is significantly below singularBeta. Passed STC: LLR: 2.97 (-2.94,2.94) <-0.50,2.50> Total: 25064 W: 2334 L: 2162 D: 20568 Elo +2.38 Ptnml(0-2): 82, 1720, 8768, 1868, 94 https://tests.stockfishchess.org/tests/view/6084ba7995e7f1852abd27e3 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,3.50> Total: 67136 W: 2644 L: 2450 D: 62042 Elo +1.00 Ptnml(0-2): 46, 2134, 28990, 2376, 22 https://tests.stockfishchess.org/tests/view/6084d79195e7f1852abd27ee Bench: 4075325 Stockfish 21042513-lonfom169 and NNUE download  

BanksiaGUI is a freeware chess Graphical User Interface. Changes v 0.41: Fixed bugs: Lichess bot: challenging function did not work well, app may be frozen if it is showing some very fast games Database: incorrectly sort (by names, events) Some small improvements/adjustments New features:    Clocks: new mode to display clocks above and under the board Elo offset can be anchored to a player Rated: auto assign Elo from a tournament result to engines Quick open a game from a tournament (from the pop-up menu) Remember the active tab of the tournament result panel New special functions for GPU engines, a user: 1) can mark engines as GPUs 2) can set up serially CPU cores for GPU engines which may be different from ones for none-GPU ones 3) get clever tournament concurrency: it auto arranges to make sure no more than one GPU game can be played at a moment but still maximize concurrency Lichess bot: detect the online status of players in the challenge list, shuffle that list before use

Clover - UCI chess engine Author: L uca Metehau Clover is a chess engine, written in C++, inspired by my favorite plant. Since the 2020 lockdown, I got bored and decided to combine the 2 things I love the most: chess and programing, into making a program that can beat me. Clover 2.1.2 download

OliThink is an open-source WB engine by Oliver Brausch MSYS2/MinGW static builds by T. Poppins Rating JCER=2722 v.5.9.3 Complete rewrite of OliThink with a very fast move generator (based on OliPerft). Engine runs without any chess information. No pawnstructure, no tables etc. OliThink 5.9.3 - download

  Temp 3'+3" Intel Core i5-1035G1 7,9 GB GUI  Fritz 17 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER Test Tournament:   156 games

Stockfish - UCI chess engine, compiled by Stefan Geschwentner Rating JCER=3157 Timestamp: 1619349717 Thread based reduction tweak. For PV nodes at the first two plies no reductions are done for each fourth thread. STC (8 threads): LLR: 2.94 (-2.94,2.94) <-0.50,2.50> Total: 53992 W: 3334 L: 3167 D: 47491 Elo +1.07 Ptnml(0-2): 64, 2713, 21285, 2860, 74 https://tests.stockfishchess.org/tests/view/6083b2d695e7f1852abd277a LTC (8 threads): LLR: 2.93 (-2.94,2.94) <0.50,3.50> Total: 64888 W: 1888 L: 1725 D: 61275 Elo +0.87 Ptnml(0-2): 14, 1556, 29146, 1709, 19 https://tests.stockfishchess.org/tests/view/6084249595e7f1852abd2795 No functional change (for one thread) Stockfish 21042513 and NNUE download  

Pedone - UCI chess engine, Author - Fabio Gobbato,  Rating JCER=2936 Pedone is an UCI chess engine written in C. It has been developed with particular care in code and data structure optimizations. Pedone 3.1 NNUE download

  Temp 3'+3" Intel Core i7 7,9 GB GUI  Fritz 17 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER Test Tournament:   240 games

Stockfish - UCI chess engine, compiled by Bmc4 Rating JCER=3157 Timestamp: 1619261733 Merge all move generators Merging `generate<EVASIONS>` and `generate<QUIET_CHECKS>` into `generate_all()`. verified to yield correct perft results, even though bench changes due to different order of generated moves. No regresion playing games: passed STC: LLR: 2.94 (-2.94,2.94) {-1.00,0.20} Total: 161800 W: 14585 L: 14624 D: 132591 Elo -0.08 Ptnml(0-2): 577, 11681, 56451, 11586, 605 https://tests.stockfishchess.org/tests/view/606532732b2df919fd5f026d passed LTC: LLR: 2.98 (-2.94,2.94) {-0.70,0.20} Total: 188504 W: 6906 L: 6961 D: 174637 Elo -0.10 Ptnml(0-2): 87, 6272, 81610, 6175, 108 https://tests.stockfishchess.org/tests/view/6065b0772b2df919fd5f02ae Bench: 4536129 Stockfish 21042412 and NNUE download  

Tucano - winboard/UCI chess engines,  Author - Alcides Schulz Rating JCER=2325 Tucano 9.09 for Android download

🥇Stockfish 13, 🥈SugaR AI 2.00, 🥉Fisherov 0.97. Relegation to 2 League: Nemorino 6.00 Patch 1, Booot 6.5, Pedone 3.0 .  Temp 3'+3" Intel Core i7 7,9 GB GUI  Fritz 17 Book  Perfect 2021 All JCER games 94 .482 Table created  Scid vs PC JCER League Tournament:   480 games League – TOP 64 1 League Edition 46 Rating JCER Score 1. Stockfish 13 3109 47.5 / 60 2. SugaR Al 2.00 3129 46.0 / 60 3. Fisherov 0.97 3159 46.0 / 60 4. Raubfisch X44f1 3112 43.5 / 60 5. Dragon 1.0 3083 43.5 / 60 6. Ethereal 12.75 NNUE 3092 41.5 / 60 7. RubiChess 2.1 3024 34.5 / 60 8. Fire 8.1 2960 25.0 / 60 9. Xiphos 0.6.1 2923 22.0 / 60 10. Igel 3.0.0 2939 22.0 / 60