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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].

Features

[6]

Board Representation

Search

Evaluation


Forum Posts

2017

2018


External Links


References

  1. ^ chess22k v1.0 by sandermvdb, OpenChess Forum, January 13, 2017
  2. ^ public boolean isEndGame(int color) in chess22k/ChessBoard.java at master · sandermvdb/chess22k · GitHub
  3. ^ isEndGame used in chess22k/EvalUtil.java at master · sandermvdb/chess22k · GitHub
  4. ^ chess22k 1.5 released by Sander Maassen vd Brink, CCC, August 12, 2017
  5. ^ chess22k 1.6 released by Sander Maassen vd Brink, CCC, November 13, 2017
  6. ^ Based on readme and GitHub - sandermvdb/chess22k

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