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Home * People * Fritz Reul
Fritz M.H. Reul,
a German computer scientist, chess programmer, and author of the chess engines List and Loop, which is also the chess engine of Wii Chess. Fritz studied mathematics and applied computer science at University of Applied Sciences Giessen-Friedberg, and defended his M.Sc. on computer chess in 2004. In 2005 he started his Ph.D. project New Architectures in Computer Chess at the Maastricht University supervised by Jaap van den Herik and Jos Uiterwijk, which he completed in June 2009 at Tilburg University[2].
- 1Tournament Play
WCCC 2003
Fritz Reul's first WCCC experience in Graz 2003 was a mess. List was not represented by its author himself, but by Erdogan Günes. Fritz, probably not aware of the ICGA rules, and with examination commitments, did not act appropriate to prove his program was not a clone, as accused by an official protest during the tournament. As a consequence, Loop List was disqualified after eight of eleven rounds [3]. With hindsight Fritz Reul was fully rehabilitated by the ICGA[4] in 2005:
DOCCC 2006
Reul's new program Loop (32-bit) played the 26th DOCCC 2006 in Leiden, represented by Opening Book AuthorClemens Keck, and surprised as runner up behind Rybka and ahead of HIARCS.
WCCC 2007
Another success was the participation of Loop Amsterdam (64-bit) during the WCCC 2007, also represented by Clemens Keck. Loop became third behind behind the later disqualified Rybka and Zappa, ahead of Shredder and GridChess.
During the ICGA Investigations in 2011 concerning the Rybka Controversy and evaluation overlaps, 64-bit Loop was inspected by Mark Watkins who found congruence with the evaluation of Fruit 2.1[5]. As confirmed by David Levy[6], the ICGA has received a complaint on Loop by Fruit author Fabien Letouzey and an investigation has been started about this case, as already mentioned by Watkins in August 2011 [7].
- Fritz Reul (2005). A Letter to the ICGA. ICGA Journal, Vol. 28, No. 1, pdf
- Fritz Reul (2009). New Architectures in Computer Chess. Ph.D. thesis, pdf
- Fritz Reul (2010). Static Exchange Evaluation with αβ-Approach. ICGA Journal, Vol. 33, No. 1
310 Chesser Loop Circle
- Loop List available soon by Fritz Reul, CCC, October 11, 2005
- doing undoing by Fritz Reul, CCC, May 14, 2007 » Make Move, Unmake Move
- Iterative DTS by Fritz Reul, CCC, July 02, 2007 » Parallel Search
- Board without color flags by Fritz Reul, CCC, October 31, 2009 » Color Flipping
- Compiler Problem by Fritz Reul, CCC, June 29, 2010
- ICGA/Rybka controversy: Feedback - Allegations against another Chess Engine – The LOOP Program by David Levy, ChessBase News, February 17, 2012
- Allegations against two more Chess Engines – The LOOP Program by David Levy, ICGA president, May 22, 2012 » Thinker
- Complaints against the Chess programs LOOP and THINKER by David Levy, ICGA President, May 9, 2014
Fritz M.H. Reul,
a German computer scientist, chess programmer, and author of the chess engines List and Loop, which is also the chess engine of Wii Chess. Fritz studied mathematics and applied computer science at University of Applied Sciences Giessen-Friedberg, and defended his M.Sc. on computer chess in 2004. In 2005 he started his Ph.D. project New Architectures in Computer Chess at the Maastricht University supervised by Jaap van den Herik and Jos Uiterwijk, which he completed in June 2009 at Tilburg University[2].
- 1Tournament Play
WCCC 2003
Fritz Reul's first WCCC experience in Graz 2003 was a mess. List was not represented by its author himself, but by Erdogan Günes. Fritz, probably not aware of the ICGA rules, and with examination commitments, did not act appropriate to prove his program was not a clone, as accused by an official protest during the tournament. As a consequence, Loop List was disqualified after eight of eleven rounds [3]. With hindsight Fritz Reul was fully rehabilitated by the ICGA[4] in 2005:
DOCCC 2006
Reul's new program Loop (32-bit) played the 26th DOCCC 2006 in Leiden, represented by Opening Book AuthorClemens Keck, and surprised as runner up behind Rybka and ahead of HIARCS.
WCCC 2007
Another success was the participation of Loop Amsterdam (64-bit) during the WCCC 2007, also represented by Clemens Keck. Loop became third behind behind the later disqualified Rybka and Zappa, ahead of Shredder and GridChess.
During the ICGA Investigations in 2011 concerning the Rybka Controversy and evaluation overlaps, 64-bit Loop was inspected by Mark Watkins who found congruence with the evaluation of Fruit 2.1[5]. As confirmed by David Levy[6], the ICGA has received a complaint on Loop by Fruit author Fabien Letouzey and an investigation has been started about this case, as already mentioned by Watkins in August 2011 [7].
- Fritz Reul (2005). A Letter to the ICGA. ICGA Journal, Vol. 28, No. 1, pdf
- Fritz Reul (2009). New Architectures in Computer Chess. Ph.D. thesis, pdf
- Fritz Reul (2010). Static Exchange Evaluation with αβ-Approach. ICGA Journal, Vol. 33, No. 1
310 Chesser Loop Circle
- Loop List available soon by Fritz Reul, CCC, October 11, 2005
- doing undoing by Fritz Reul, CCC, May 14, 2007 » Make Move, Unmake Move
- Iterative DTS by Fritz Reul, CCC, July 02, 2007 » Parallel Search
- Board without color flags by Fritz Reul, CCC, October 31, 2009 » Color Flipping
- Compiler Problem by Fritz Reul, CCC, June 29, 2010
- ICGA/Rybka controversy: Feedback - Allegations against another Chess Engine – The LOOP Program by David Levy, ChessBase News, February 17, 2012
- Allegations against two more Chess Engines – The LOOP Program by David Levy, ICGA president, May 22, 2012 » Thinker
- Complaints against the Chess programs LOOP and THINKER by David Levy, ICGA President, May 9, 2014
Chess Board Loop
- ↑...weil Chess960 Leben ins Schach bringt Die Computer Schach Experten Frank Schneider und Kai Skibbe im Interview (German)
- ↑Fritz Reul (2009). New Architectures in Computer Chess. Ph.D. thesis
- ↑ICGA disqualifies chess program 'List', ChessBase News, November 27, 2003
- ↑David Levy (2005). Cancellation of Suspension.ICGA Journal, Vol. 28, No. 1pdf
- ↑Loop 2007 / Fruit 2.1 by BB+, OpenChess Forum, April 18, 2011
- ↑ICGA/Rybka controversy: Feedback - Allegations against another Chess Engine – The LOOP Program by David Levy, ChessBase News, February 17, 2012
- ↑Re: Loop 2007 / Fruit 2.1 by BB+, OpenChess Forum, August 22, 2011
- ↑dblp: Fritz Reul
Home * Engines * Loop
Loop,
an UCI compliant chess engine by Fritz Reul with different board representations for 32-bit and 64-bit platforms, at times commercial. Loop became subject of its author's Ph.D. thesis New Architectures in Computer Chess[2] . Despite different board representation, both Loop versions presumably share same search and evaluation with similar features and weights.
- 3Evaluation
- 7Forum Posts
- 8External Links
Loop Chess Engine
The 32-bit program, based on Reul's former program List, relies on a 15x12 board representation in conjunction with disjoint piece-lists with adequate move generation of blocker loops. It participated as Loop Leiden at the DOCCC 2006, becoming strong runner up behind Rybka. A specially adapted version called Loop Express became the engine of Wii Chess for the NintendoWiiconsole in 2008 [3] . The non-bitboard
