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an UCI compliant chess enginge written in C++ by Thomas Petzke, in late 2010 and 2011 translated from his Pascal based mACE engine, started a year earlier. Subsequent versions steadily improved, and the development of mACE and iCE over the years is documented in Thomas mACE blog [1], along with elaborating on all kind of chess programming topics.
Ice Chess at Rosa Parks Circle [2]


iCE uses Magic Bitboards and a fail-hard PVS framework. Beside code cleanup, refactoring and tuning, iCE 2.0 from September 2014 now features History Heuristic, Late Move Pruning, Razoring and Counter Move Heuristics. Further, compared to iCE 1.0 LMR became less aggressive, Lazy Evaluation was removed [3], and LMR added at the root. The former pure Pawn Hash Table now incorporates king positions to hash additional terms [4]. iCE's evaluation is the result of an extensive automated tuning process using the PBIL [5] type of genetic algorithms [6].

See also

Forum Posts

External Links

Chess Engine





Ice Chess



  1. ^ mACE Chess blog by Thomas Petzke
  2. ^ Ice Chess Battle At Rosa Parks Circle, Image 4 (cropped) - The Chess Board, by Gene Parker, January 11, 2011 - The Ice pieces were made by Randy Finch and Ice Sculptures, LTD of Grand Rapids, Michigan
  3. ^ Not being lazy anymore, mACE Chess, June 28, 2014
  4. ^ Chess Programming - Inside iCE
  5. ^ Re: Eval tuning - any open source engines with GA or PBIL? by Thomas Petzke, CCC, December 06, 2014
  6. ^ Re: FCT1: iCE 2.0 v2240 POP x64 is still running ... by Thomas Petzke, CCC, September 19, 2014

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