Problem instances follow a somewhat simplified version of the RobinXML format (see [1] for the simplified version, and [2] for the full description).
All instances in this directory were generated with a random instance generator developed for the International Timetabling Competition 2021 (ITC2021, see [3]). All instances are feasible by construction. Particular attention has been given to ensure that the instances are diverse, challenging, and real-world like, using the framework of instance space analysis (see [3], [4], and [5]).
[1] The International Timetabling Competition on Sports Timetabling (ITC2021) by Van Bulck, Goossens
[2] RobinX: A three-field classification and unified data format for round-robin sports timetabling
[3] The International Timetabling Competition on Sports Timetabling (ITC2021) by Van Bulck, Goossens
[4] Which algorithm to select in sports timetabling? by Van Bulck, Goossens, Clarner, Dimitsas, Fonseca, Lamas-Fernandez, Lester, Pedersen, Phillips, and Rosati
[5] Instance Space Analysis for Algorithm Testing: Methodology and Software Tools by Smith-Miles, Muñoz.