Competition Report: CHC-COMP-21
Grigory Fedyukovich (Florida State University, USA), Philipp R\"ummer, (Uppsala University, Sweden)

TL;DR
CHC-COMP-21 is a competition evaluating 7 solvers for Constrained Horn Clauses across various logical theories, providing insights into solver performance and competition organization.
Contribution
This report introduces the design, organization, and results of the fourth CHC-COMP solver competition, highlighting advancements in solver evaluation methods.
Findings
Seven solvers participated across seven tracks.
Performance varied significantly among solvers.
The competition framework facilitated systematic evaluation.
Abstract
CHC-COMP-21 is the fourth competition of solvers for Constrained Horn Clauses. In this year, 7 solvers participated at the competition, and were evaluated in 7 separate tracks on problems in linear integer arithmetic, linear real arithmetic, arrays, and algebraic data-types. The competition was run in March 2021 using the StarExec computing cluster. This report gives an overview of the competition design, explains the organisation of the competition, and presents the competition results.
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