MadChess

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[ Me Worry? [1] MadChess,

an UCI compliant open source chess engine by Erik Madsen, written in C# to run under the Windows .NET framework. It was first released under the GNU General Public License Version 3 as successor of Erik’s former C# engine RumbleMinze in October 2012 [2], and features adjustable playing strength with improved algorithms since MadChess 1.4 [3] [4]. MadChess 2.1, released in February 2017 is using .NET Core, Microsoft’s cross-platform free and open-source managed software framework to support not only Windows, but Linux, and Mac [5] [6].

Move Generation#

MadChess applies an incremental move generation, using the C# yield statement [7] [8] [9] [10] [11] using incrementally updated list of attackers for any rank, file, diagonal, or anti-diagonal.

Search#

MadChess performs a principal variation search along with transposition table, killer and history heuristic, null move pruning and late move reductions inside an iterative deepening framework with aspiration. It eliminates all reductions and lazy evaluation along the principal variation.

Evaluation#

The evaluation might be lazy with respect to bounds, and otherwise uses a tapered evaluation on game phase between speculative computed middlegame and endgame scores, considering piece-square tables, mobility, pawn structure, and king safety and various piece evaluation terms.

See also#

• Madness Schach
• Matchess
• RumbleMinze

Forum Posts#

2012#

• MadChess 1.0 Released (C# .NET Engine) by Erik Madsen, CCC, October 25, 2012
• Score Inaccuracy: An Engine Weakening Algorithm by Erik Madsen, CCC, October 31, 2012 » Playing Strength

2013#

• MadChess 1.1 Released by Erik Madsen, CCC, January 06, 2013
• MadChess 1.2 Released by Erik Madsen, CCC, March 09, 2013
• MadChess 1.3 Released by Erik Madsen, CCC, September 28, 2013

2014#

• MadChess UCI_LimitStrength Algorithm by Erik Madsen, CCC, April 12, 2014 » UCI, Playing Strength
• MadChess 1.4 Released by Erik Madsen, CCC, April 12, 2014
• MadChess With Odds Versus Elite Engines by Erik Madsen, CCC, September 11, 2014
• MadChess 2.0 Development by Erik Madsen, CCC, November 12, 2014

2015 …#

• MadChess 2.0 Released by Erik Madsen, CCC, October 12, 2015
• MadChess 2.1 Released - Supports Windows, Linux, Mac by Erik Madsen, CCC, February 23, 2017
• MadChess 2.2 Released by Erik Madsen, CCC, July 04, 2017
• MadChess 3.0 Beta by Erik Madsen, CCC, October 29, 2018
• Particle Swarm Optimization Code by Erik Madsen, CCC, November 24, 2018 » Automated Tuning

2020 …#

• Re: MadChess 3.0 Beta by Erik Madsen, CCC, July 23, 2020
• Engine Crash Detective Story by Erik Madsen, CCC, August 29, 2020 » Debugging
• Are Aspiration Windows Worthless? by Erik Madsen, CCC, December 20, 2020 » Aspiration Windows
• MadChess 3.0 Released by Erik Madsen, CCC, April 19, 2021

Blog Posts#

• MadChess 3.0 Beta 5c5d4fc (Piece Mobility) by Erik Madsen, February 1, 2020 » Mobility
• MadChess 3.0 Beta 6f3d17a (Late Move Pruning) by Erik Madsen, February 8, 2020 » LMP
• MadChess 3.0 Beta bef88d5 (Tweak Search, Tune Eval) by Erik Madsen, July 23, 2020
• MadChess 3.0 Beta 2d855ec (Crash Bug) – MadChess by Erik Madsen, August 29, 2020 [12]
• MadChess 3.0 Beta 4b7963b (Remove Aspiration Windows) – MadChess by Erik Madsen, December 20, 2020 » Aspiration Windows [13]
• MadChess 3.0 Released – MadChess by Erik Madsen, April 19, 2021

External Links#

Chess Engine#

• MadChess

MadChess - User Guide

• MadChess in CCRL 40/40

Misc#

• MAD from Wikipedia
• Mad (magazine) from Wikipedia
• Insanity from Wikipedia

References#

1. ↑ A postcard with the public domain “ me worry?” face that later inspired Mad magazine’s Alfred E. Neuman, ca. 1910s, Alfred E. Neuman from Wikipedia
2. ↑ MadChess 1.0 Released (C# .NET Engine) by Erik Madsen, CCC, October 25, 2012
3. ↑ MadChess UCI_LimitStrength Algorithm by Erik Madsen, CCC, April 12, 2014
4. ↑ MadChess - User Guide
5. ↑ MadChess 2.1 Released – MadChess, February 22, 2017
6. ↑ MadChess 2.1 Released - Supports Windows, Linux, Mac by Erik Madsen, CCC, February 23, 2017
7. ↑ Re: Question About CPP-C#, Performance, and Square Representation by Erik Madsen, CCC, October 03, 2012
8. ↑ yield - MSDN C# Reference
9. ↑ Behind the scenes of the C# yield keyword | Struggles by Lars Corneliussen, June 9, 2008
10. ↑ Generator (computer programming) from Wikipedia
11. ↑ Coroutine from Wikipedia
12. ↑ Engine Crash Detective Story by Erik Madsen, CCC, August 29, 2020
13. ↑ Are Aspiration Windows Worthless? by Erik Madsen, CCC, December 20, 2020 » Aspiration Windows

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