Mediocre

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Mediocre Mediocre, (Mediocre Chess)

an UCI compliant chess engine by Jonatan Pettersson, written entirely in Java. Mediocre is the result of a chess programming blog, which describes aspects of the engine in detail [1]. Mediocre played the WCRCC 2007 and gained 7½ out of 14.

Board Representation

• 0x88
• Attack Tables

Search

• Iterative Deepening
• Fractional Plies
• Aspiration Windows
• Principal Variation Search
• Transposition Table
  • Zobrist Hashing
• Selectivity
  • Null Move Pruning
  • Futility Pruning
  • Late Move Reductions
  • Mate Threat Extensions
  • Passed Pawn Extensions
• Move Ordering
  • History Heuristic
  • Killer Heuristic
  • Internal Iterative Deepening
  • Static Exchange Evaluation

Evaluation

• Evaluation Hash Table
• Tapered Eval
• Piece-Square Tables
• Pawn Structure
• Pawn Hash Table
• King Tropism
• Rook on Seventh
• Knight Outposts
• Hanging Pieces

Misc#

• Perft
• PolyGlot Opening Book
• Pondering

Forum Posts#

2007 …#

• Mediocre 0.31 : 2127 by Patrick Buchmann, CCC, April 07, 2007
• Mediocre 0.32 : 2146 by Patrick Buchmann, CCC, May 01, 2007
• Mediocre 0.33 : 2184 by Patrick Buchmann, CCC, May 18, 2007
• Mediocre has a new home by Jonatan Pettersson, CCC, December 09, 2008
• Mediocre 0.334 : 2126 by Patrick Buchmann, CCC, December 25, 2008
• Mediocre 0.34 : 2191 by Patrick Buchmann, CCC, January 24, 2009

2010 …#

• Blog back on track (Mediocre engine) by Jonatan Pettersson, CCC, October 07, 2011
• Mediocre v0.4 released by Jonatan Pettersson, CCC, November 26, 2011
• Mediocre Chess 0.4 for Fritzy (and not only) ! by Sylwy, CCC, November 29, 2011
• The progress of Mediocre Chess (of Mr.Jonatan Pettersson) by Sylwy, CCC, December 09, 2011
• Mediocre v0.5 released by Jonatan Pettersson, CCC, July 30, 2012
• Mediocre 0.5 EXE? by Steve Maughan, CCC, September 06, 2013

External Links#

Chess Engine#

• Mediocre Chess Blog
• Mediocre on Souceforge
• Mediocre website
• Index of /chess/engines/Jim Ablett/Mediocre Chess by Jim Ablett, hosted by Kirill Kryukov
• Mediocre in CCRL 40/15

Misc#

• mediocre - Wiktionary
• Chick Corea and Friends - Mediocre, Remembering Bud Powell (1997), YouTube Video

feat.: Wallace Roney, Joshua Redman, Christian McBride and Roy Haynes

References#

1. ↑ Mediocre Chess Blog
2. ↑ Features based on readme.txt of Mediocre v0.5

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