Registration Open. Register by January 22,
2027 (AoE).
Details that are still to be announced are listed on the Rules page; see also the timeline.
About
The computational development of optimization tools is a key component within the MIP community and has proven to be a challenging task. It requires great knowledge of the well-established methods, technical implementation abilities, as well as creativity to push the boundaries with novel solutions.
In 2022, the annual Mixed Integer Programming Workshop established a computational competition in order to encourage and provide recognition to the development of novel practical techniques within MIP technology. In 2025, it was renamed, with their permission, to honor Ailsa H. Land and Alison G. Harcourt (née Doig), who proposed the first LP-based branch-and-bound algorithm, a fundamental component of every modern MIP solver.
The 2027 Land-Doig MIP competition is supported by Gurobi, which is providing prizes for the winner and honorable mentions.
The competition is also supported by the Mixed Integer Programming Society (MIPS), a section of the Mathematical Optimization Society (MOS), via the MIP Workshop.
The topic of the 2027 MIP competition is "Explainability and Small Infeasible Subsystems". The goal is to advance the state of the art on computing small infeasible subsystems.
The jury will select one winner and up to two honorable mentions to present their work at the MIP Workshop 2027.
Furthermore, we will provide the following:
- One representative of the winning team will receive travel support to the MIP Workshop and free registration.
- High-quality submissions will receive an expedited review process in Mathematical Programming Computation.
Timeline
| Date | Milestone |
|---|---|
| From October 2026 | Registration open |
| Beginning of December 2026 | Deadline for instance submissions |
| End of December 2026 | Final evaluation details announced: instance sets, evaluation machine and ranking |
| January 22, 2027 (AoE) | Registration closes |
| Mid-March 2027 | Final submission of code and report, evaluation on public and hidden set of instances |
| End of May 2027 | MIP Workshop: Winners announced |
Register with the registration form by January 22, 2027 (AoE).
Organizing Committee
- Pierre Bonami — Gurobi (chair)
- Gerald Gamrath — Cardinal Operations
- Shuvomoy Das Gupta — Rice University
- Reem Khir — Purdue University
- Gioni Mexi — Zuse Institute Berlin
- Thiago Serra — University of Iowa
For questions, feedback, or inquiries, please visit the competition GitHub repository: https://github.com/mixedinteger/MIPcc27, which hosts the solution checker and helper scripts, solution format, program interface, and sample instances. Participants can open an Issue or start a Discussion.