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Lion Melon Carving [1]

Lion, (Lion++)
a chess engine by primary author Giancarlo Delli Colli, initially written in Java and later ported to C++ based on the source code of Fruit, but able to run on multi-processor. Lion participated at the CCC 2005 in Bologna and the WCCC 2006 in Turin. At the WCCC, after five rounds were played and a protest was filed by a participant, Yngvi Björnsson and independently, Jonathan Schaeffer inspected Lion's source code and found it a close derivative of Fabien Letouzey’s program Fruit, which would have been acceptable if this had been revealed, credit given, and permission received before entering [2]. The Lion authors did not deny, and provided their own interpretation of rules since they had included a file crediting the effort by Fabien Letouzey, albeit invisible for other people [3]. Lion++ 1.5 was disqualified according to rule 2 [4]. The controversial term 'application detail' was later amended by the ICGA and made explicit as 'submission details' as part of rule 2 [5].

See also

Forum Posts

External Links

Chess Engine



  1. Watermelon, Watermelon! by Chris Galvin, July 9, 2012
  2. Computer Chess – a conversation, May 30. 2006
  3. Jaap van den Herik (2006). The Interpretation of Rules. Editorial, ICGA Journal, Vol. 29, No. 2, pdf
  4. Lion's ICGA Tournaments
  5. WCCC Rules (ICGA Tournaments), June 11-18, 2007

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