MiniZinc Challenge 2014 Results


The entrants for this year (with their descriptions, when provided):

In addition, the challenge organisers entered the following FlatZinc implementations:

  • Chuffed (description). A C++ FD solver using lazy clause generation.
  • G12/FD. A Mercury FD solver (the G12 FlatZinc interpreter's default solver).
  • G12/LazyFD. A Mercury FD solver using lazy clause generation.
  • Gecode (description). A C++ FD solver.
  • sunny-cp (description). A single-threaded CP portfolio solver using, e.g., Chuffed, G12 solvers, Gecode, MinisatID.
  • sunny-cp-presolve. sunny-cp with pre-solving.

As per the challenge rules, these entries are not eligible for prizes, but do modify the scoring results. Furthermore, entries in the FD search category (JaCoP and SICStus Prolog) were automatically included in the free search category, while entries in the free search category (Concrete, Chuffed, G12/FD, G12/LazyFD, HaifaCSP, MinisatID, Mistral, Opturion CPX, Picat CP, Picat SAT and promoted FD entries) were automatically included in the parallel search category. Lastly, all entries in the free search category and promoted entries into that category were automatically included in the open search category.

Summary of Results

The results for the MiniZinc Challenge 2014 were
  • Fixed search:
    • Gold medal: OR-Tools
    • Silver medal: Opturion CPX
    • Bronze medal: SICStus Prolog
  • Free search:
    • Gold medal: iZplus
    • Silver medal: Opturion CPX
    • Bronze medal: Choco
  • Parallel search:
    • Gold medal: OR-Tools
    • Silver medal: Opturion CPX
    • Bronze medal: Choco
  • Open class:
    • Gold medal: OR-Tools
    • Silver medal: Opturion CPX
    • Bronze medal: Choco

Description of Results

All times are given in milliseconds.

A score of 0.0 indicates a worse answer in quality (worse objective, no proof of optimality, or no answer for satisfaction problems), 1.0 a better solution in quality. When the quality is the same, the 1.0 purse is split with respect to time used.

If a promoted entry does not recognize an option (or states that it is just ignored), times and solutions from the previous category are used for scoring. The suffixes -fd, -free, -par or -open (for the parallel portfolio solver entered) at the end of the solvers names indicate which configuration the solvers were run with.

mzn2fzn was run with the same time and memory limits as the solvers.

In the Status column:

  • S indicates that a solution was found,
  • C indicates that the search was complete,
  • INC indicates an incorrect answer
  • MZN indicates that flattening aborted (time-out or out-of-memory)
  • UNK indicates that no answer was returned in the time limit or the solver aborted.

Download all problems

All problems are available in a zipped tar-ball here.


Select a list of solvers and benchmarks and click on "Compute Results" to score the solvers against each other on the selected benchmarks. The entrants for each of the fd search, free search and parallel search categories can be selected with the corresponding buttons.

Solver selection: Problem selection:


Total per problem:

Solver Score
Problem Solver Score

Individual results:

Problem Instance Solver Status Time Objective Score

Global constraint per model

The following table lists the global constraints used by each model in this year's challenge.

Model Global constraints used
amaze count
cyclic-rcpsp cumulative
elitserien alldifferent, global_cardinality_closed, inverse, member, regular
jp-encoding count
liner-sf-repositioning alldifferent, alldifferent_except_0
mario subcircuit
mqueens lex_lesseq
openshop cumulative
rectangle-packing cumulative, diffn
smelt cumulative
spot5 table
stochastic-vrp circuit
traveling-tppv alldifferent, regular

The files on this page are for MiniZinc version 1.6.