Problem submissions for the 2024 MiniZinc Challenge are currently open! See the call for problems for more information.

MiniZinc Challenge 2014

The Challenge

The aim of the challenge is to start to compare various constraint solving technology on the same problems sets. The focus is on finite domain propagation solvers. An auxiliary aim is to build up a library of interesting problem models, which can be used to compare solvers and solving technologies.

Entrants to the challenge provide a FlatZinc solver and global constraint definitions specialized for their solver. Each solver is run on 100 MiniZinc model instances. We run the translator mzn2fzn on the MiniZinc model and instance using the provided global constraint definitions to create a FlatZinc file. The FlatZinc file is input to the provided solver. Points are awarded for solving problems, speed of solution, and goodness of solutions (for optimization problems).


  • 2014-09-19 A minor bug in the scoring script was fixed and the results have been updated correspondingly.
  • 2014-09-10 Announcement of the results available here.
  • 2014-08-11 Extension of the final submission deadline to Friday, 15 August 2014.
  • 2014-07-08 Announcement of MiniZinc Challenge Judges.
  • 2014-06-26 Official Call for Participation for the MiniZinc Challenge has been made.
  • 2014-04-17 Initial Call for MiniZinc Problems has been made.


  • Registration opens: Thu, 1 May 2014.
  • Problem submission deadline: Fri, 6 June 2014.
  • Initial submission round begins: Fri, 18 July 2014.
  • Initial submission round begins: Sun, 10 August 2014.
  • Final submissions: Sun, 10 August 2014 Fri, 15 August 2014.
  • Announcement of results at CP2014: 8-12 September 2014.


Entrants must register their intention to enter the contest before the first submission round.
The first submission round is an opportunity for us to provide feedback concerning your entry; it does not count towards the final result.
Feel free to register and later withdraw.

To register send an email with the following subject line

[MZNC14] registration


mzn-challenge ‘at’

In the body of the email please include an email address at which we can contact you.


We will provide submission details via email to the address provided above.

Problem Submission

We strongly encourage all entrants to submit one or two MiniZinc models satisfying the contest requirements, together with instances for these models. They can be submitted as tarballs to:

mzn-challenge ‘at’

The sooner they are submitted the better, the deadline is 14 June 2014. The call for problem submission is available here. Please feel free to distribute it.


The rules for the MiniZinc Challenge 2014 are available here.
If we need to make changes to the rules, all registered entrants will be informed by email.


The judges will be responsible for selecting the tested instances, vetting the results, and ruling on any questions that arise during the competition.

  • Jimmy H.M. Lee. Chinese University of Hong Kong.
  • Barry O'Sullivan, Cork Constraint Computation Center.
  • Roland Yap, National University of Singapore.


This is the seventh time this challenge is run, and there are many possibilities for comparing CP solvers. The rules try to make a sensible set of choices for the comparison. We would welcome any comments or suggestions regarding the running of this challenge.

We can be contacted at:

mzn-challenge ‘at’

MiniZinc forums

The MiniZinc forum is for beginners, users, and developers to discuss MiniZinc. If you would like to join then sign up for the MiniZinc forums.


The G12 MiniZinc page includes a list of resources related to MiniZinc and FlatZinc.

The G12 MiniZinc Distribution includes a MiniZinc-to-FlatZinc converter and a large suite of MiniZinc examples and benchmarks.

The MiniZinc Challenge 2013 webpage, include the results from that year.

The MiniZinc Challenge 2012 webpage, include the results from that year.

The MiniZinc Challenge 2011 webpage, include the results from that year.

The MiniZinc Challenge 2010 webpage, include the results from that year.

The MiniZinc Challenge 2009 webpage, include the results from that year.

The MiniZinc Challenge 2008 webpage, including the results from that year.