Since you’re here...

We hope you will consider supporting us today. We need your support to continue to exist, because good entries are more and more work time. Every reader contribution, however big or small, is so valuable. Support "Chess Engines Diary" even a small amount– and it only takes a minute. Thank you.
============================== My email: jotes@go2.pl



Chess engine: Pedantic 0.5.0

-

 


Pedantic - UCI engines
Rating CEDR=2901

v.0.5.0:
This version continues to incrementally improve the playing strength of Pedantic over the prior version. Included in this release are the following changes:

Changed phase tracking from using total material to using a geometric sequence { 1, 2, 2, 4, 8 }. Includes pawn values in phase calculation.
Expanded phalanx pawn evaluation bonus from using single value to its own piece square table.
Added evaluation for blocking enemy passed pawns by piece and rank.
Added evaluation for pawns defending other pawns in chain by square.
Added evaluation for passed-pawns with distance from both kings and whether or not the enemy king can stop promotion.
Added evaluation for pawn rams by square.
Added evaluation for threats by attacking piece and defending piece.
Enhanced passed pawn evaluation.
Added evaluation bonus for passed pawns that can safely advance.
Removed ineffective evaluation for backward pawns
Replaced Internal Iterative Deepening (IID) with Internal Iterative Reduction (IIR).
Greatly improved SEE-based pruning.
Updated evaluation tuning to use gradient descent.
Corrected major bug that has been plaguing prior versions in the transposition table replacement scheme that leads to lost games even after finding mate against opponent.
Refactored evaluation function to use combined mg/eg scoring instead of discrete values.
Added internal benchmark.
Added support for UCI Threads option and Lazy SMP. Can now participate in 4CPU and 8CPU tournament matches.
Playing Strength Improvements
AMD Ryzen 9 7940hs ♦ 256mb Hash Table ♦ 3-6 Man Syzygy ♦ Concurrency 14

+162 +/-9 Elo over Pedantic 0.4.1 in self-play at 20+0.2 time controls.
3007 +/-9 Elo at Blitz (2:00+1) time controls.
2944 +/-19 Elo at 40/15 (12:00+8) time controls.

Self-Play Results
Score of Pedantic 0.5.0 Dev vs Pedantic 0.4.1: 2251 - 508 - 1241  [0.718] 4000  
...      Pedantic 0.5.0 Dev playing White: 1208 - 196 - 596  [0.753] 2000  
...      Pedantic 0.5.0 Dev playing Black: 1043 - 312 - 645  [0.683] 2000  
...      White vs Black: 1520 - 1239 - 1241  [0.535] 4000  
Elo difference: 162.2 +/- 9.4, LOS: 100.0 %, DrawRatio: 31.0 %  

Pedantic 0.5.0 Release


Comments

Post a Comment

Popular posts from this blog

New Strong Engines Test, by Chess Engines Diary, 2024.04.12

-
Image
  💾  552 (!) games from the tournament download   👍 @chessenginesdiary  Country - Poland, City -  Malbork 🕓 Time 3'+3" 💻HP Pavilion i5-1035G1 8GB RAM 🖬 GUI-Banksia All  CEDR  317.321 games download  (01.04.2024 - 3'+3")  HypnoS 030424, Yuli GM Pro 16, Stockfish 16.1 and ShashChess 35 . These four engines scored the same number of points and placed at the top of the table in this strong tournament. Tech table: Engine KN/move NPS dep/mov time/mov mov/game time/game fails Alexandria 6.1.0 3218 576429 30.2 5.6 56.7 316.2 Berserk 13 4779 841025 36.7 5.7 56.0 318.1 Brainlearn 28 2275 366977 31.4 6.2 43.5 269.4 Caissa 1.18 5492 923486 30.2 5.9 50.4 299.7 Clover 6.1.19 4803 854377 31.4 5.6 62.2 349.4 Cool Iris 12.10 2201 356730 27.6 6.2 51.2 315.5 CorChess 20240331 2253 372774 27.4 6.0 52.2 315.8 Crystal 8 3582 571994 20.3 6.3 47.7 298.8 Fire 9.3 5225 876565 22.0 6.0 55.5 331.1 Fisherov chess monk 1.2 3487 619728 36.0 5.6 60.4 340.0 Hyp
Read more

New chess opening book: M11.2 (bin and ctg)

-
Image
  We provide two opening books, in two different formats: bin and ctg. This is enough to be used in almost any chess program (GUI). Of course, every book may contain errors, but this one is based on a high rating. Happy testing! Book - CTG format Customers who wish to use the CTG format book will need a GUI capable of reading this format, ie. Chessbase GUIs.  Please save the book in your book folder. We strongly recommend that you "Optimize" the book in the Book options dialog so the tournament moves are chosen. The book is very wide even in tournament mode unlike most other books. A type of book format mainly used by chess programs from Chessbase , such as Fritz, Chess Base, Komodo, FatFritz, Houdini , etc. Book - BIN format (  Used by chess GUIs Arena, Banksia and Droidfish) Binary books have some important advantages, especially for computer chess engines: space-efficient, fast on accessing and searching, more useful information.  At the most simple form, they are just a
Read more

New version chess engine: Lc0 BT4

-
Image
LcZero - CEDR Rating=3683 vBT4: Big transformer 4. New network architecture which builds off of BT3 by adding two types of auxiliary heads, future heads and categorical value heads. The categorical value heads predict a distribution over values of q rather than a WDL outcome distribution, and the future heads predict the moves that will be played over the next two plies. The hope is that these heads will give additional information to the net to improve training speed. We've also fixed half-precision training, so this model will be larger. BT4 training started in mid-October and is expected to take a few months. It has 15 layers with 1024 embedding size, 32 heads per layer, and 1536 emb size, for roughly a doubling in size over BT3.  Individual statistics:  Lc0 0.30.0 Stockfish 16 5/13 -3 13 Games Booot 7.2 6/10 +2 10 Games Critter 1.6a 8/9 +7 9 Games Dragon 3.2 4/8 +0 8 Games Stockfish 20230729 3.5/8 -1 8 Games ShashChess 33.2 3.5/8 -1 8 Games Fisherov chess monk 1.2 3/
Read more

Dragon NNUE by Komodo Chess - it's free!

-
Image
    Dragon by Komodo Chess Larry Kaufman: We have released Dragon at komodochess.com. Dragon uses NNUE (Neural Network Updated Efficiently) technology, originally developed for the game of shogi. Komodo has a great deal of chess knowledge in its evaluation. Training an NNUE network based on this evaluation was both an advantage and a challenge, requiring experimentation with architectures and data generation of billions of positions. The reinforcement learning phase for Dragon is in its infancy, but is already showing great promise. Dragon is a huge strength improvement over 14.1, the last release, about 197 elo in MCTS mode and 189 elo in standard mode, at CCRL blitz time control on one thread based on direct matches. With four threads, the gains were 156 elo in MCTS and 170 in standard mode. The improvement is due to the embedded neural network providing much more accurate evaluation and also in some sense gaining an extra ply or so of search by “seeing” some tactics that a normal ev
Read more