Call For Participants in the competition (in text)

Please distribute to those who are interested.

Call For Participants in the competition

The 1st Combinatorial Reconfiguration Challenge 
(CoRe Challenge 2022)

Submission deadline: March 31st 2022


Combinatorial Reconfiguration is a novel algorithmic concept that provides mathematical models and analysis for “transformations over state spaces.” Its appearance ranges from theory to applications. However, its technical achievements are hard to access. Thus, it is required to found a common infrastructure for utilizing and applying the algorithmic technology of combinatorial reconfiguration. See this website for more backgrounds.

The 1st Combinatorial Reconfiguration Challenge (CoRe Challenge 2022) is a competition aiming for practically exploring the combinatorial reconfiguration problem.

This 1st challenge targets the Independent Set Reconfiguration (ISR) problem. The ISR problem is one of the most well-studied reconfiguration problems. Theoretically, the problem is PSPACE-complete, which implies that there exist instances such that even a shortest reconfiguration sequence requires a super polynomial steps. Theoretical results and their references can be found in a survey by N. Nishimura.

Important Dates

Nov. 24, 2021
Challenge is open (and you can join at any point) & 1st benchmark released
Dec. 27-31, 2021
2nd benchmark released & Submission details are made public (sometime in the week of 27th)
Jan. 24-28, 2022
3rd benchmark released (sometime in the week of 24th)
Mar. 31, 2022
Challenge ends (submission deadline) — 23:59 AoE, UTC-12

Rules/Tracks and Other Details

See our web page


Certificates will be awarded to participants who perform well in each track/metric.


KAKENHI Grant-in-Aid for Transformative Research Areas (B) “Fusion of Computer Science, Engineering and Mathematics Approaches for Expanding Combinatorial Reconfiguration”


  • Takehiro Ito (Tohoku University, Japan)
  • Yoshio Okamoto (The University of Electro-Communications, Japan)
  • Takehide Soh (Kobe University, Japan)


For public questions, please use For private questions, please use core.challenge [at]