Difference between revisions of "Chess22k"
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* [http://www.talkchess.com/forum/viewtopic.php?t=67206 chess22k 1.9 released] by [[Sander Maassen vd Brink]], [[CCC]], April 23, 2018 | * [http://www.talkchess.com/forum/viewtopic.php?t=67206 chess22k 1.9 released] by [[Sander Maassen vd Brink]], [[CCC]], April 23, 2018 | ||
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67941 chess22k 1.10 released] by [[Sander Maassen vd Brink]], [[CCC]], July 09, 2018 | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67941 chess22k 1.10 released] by [[Sander Maassen vd Brink]], [[CCC]], July 09, 2018 | ||
| + | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=69139 chess22k 1.12 released] by [[Sander Maassen vd Brink]], [[CCC]], December 03, 2018 | ||
| + | ==2019== | ||
| + | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71396 chess22k 1.13 released] by [[Sander Maassen vd Brink]], [[CCC]], July 28, 2019 | ||
| + | ==2020== | ||
| + | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=73773 chess22k 1.14 released] by [[Sander Maassen vd Brink]], [[CCC]], April 26, 2020 | ||
=External Links= | =External Links= | ||
Latest revision as of 17:51, 27 April 2020
chess22k,
an UCI compliant open source chess engine by Sander Maassen vd Brink, written in Java first released in January 2017 [1]. While already in the 2400 Elo range using a 64-bit Java Runtime Environment (JRE), it has not initially implemented a tapered evaluation, but abrupt transition based on piece counts per side to distinguish between middlegame and endgame terms [2] [3]. However, tapered evaluation was implemented in chess22k 1.5 along with new evaluation terms adjusted by Texel's tuning method [4]. In November 2017, chess22k had its over the board tournament debut, version 1.6 played the CSVN PT 52 in Leiden, quite successful - shared 4th place with 6/9. Soon released afterwards, chess22k 1.6 requires Java 9 [5].
Contents
Features
Board Representation
Search
- Lazy SMP (1.10)
- Iterative Deepening
- Aspiration Windows
- Principal Variation Search
- Transposition Table
- Move Ordering
- Selectivity
Evaluation
- Evaluation Hash Table
- Tapered Eval 1.5
- Material
- Bishop Pair
- Piece-Square Tables
- Mobility
- Outposts
- Pawn Hash Table
- Pawn Structure
- King Safety
- Tactical Penalties
- Texel's Tuning Method
Forum Posts
2017
- chess22k v1.0 by sandermvdb, OpenChess Forum, January 13, 2017
- New release: chess22k v1.1 by Sander Maassen vd Brink, CCC, February 09, 2017
- chess22k 1.2 released by Sander Maassen vd Brink, CCC, March 19, 2017
- chess22k 1.3 released by Sander Maassen vd Brink, CCC, April 26, 2017
- Texel tuning method question by Sander Maassen vd Brink, CCC, June 05, 2017 » Texel's Tuning Method
- Impressive Texel-tuning results by Sander Maassen vd Brink, CCC, June 16, 2017
- chess22k 1.4 released by Sander Maassen vd Brink, CCC, June 18, 2017
- chess22k 1.5 released by Sander Maassen vd Brink, CCC, August 12, 2017
- chess22k 1.6 released by Sander Maassen vd Brink, CCC, November 13, 2017
- chess22k 1.7 released by Sander Maassen vd Brink, December 28, 2017
2018
- chess22k progress overview by Sander Maassen vd Brink, January 09, 2018
- chess22k 1.8 released by Sander Maassen vd Brink, CCC, March 04, 2018
- chess22k 1.9 released by Sander Maassen vd Brink, CCC, April 23, 2018
- chess22k 1.10 released by Sander Maassen vd Brink, CCC, July 09, 2018
- chess22k 1.12 released by Sander Maassen vd Brink, CCC, December 03, 2018
2019
- chess22k 1.13 released by Sander Maassen vd Brink, CCC, July 28, 2019
2020
- chess22k 1.14 released by Sander Maassen vd Brink, CCC, April 26, 2020
External Links
References
- ↑ chess22k v1.0 by sandermvdb, OpenChess Forum, January 13, 2017
- ↑ public boolean isEndGame(int color) in chess22k/ChessBoard.java at master · sandermvdb/chess22k · GitHub
- ↑ isEndGame used in chess22k/EvalUtil.java at master · sandermvdb/chess22k · GitHub
- ↑ chess22k 1.5 released by Sander Maassen vd Brink, CCC, August 12, 2017
- ↑ chess22k 1.6 released by Sander Maassen vd Brink, CCC, November 13, 2017
- ↑ Based on readme and GitHub - sandermvdb/chess22k
