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These instances turn out to be very hard to solve with exact TSP solvers. On a 200 vertex instance from our family, Concorde, the fastest known exact TSP solver, needs more than 1,000,000 times the runtime it needs for TSPLIB instances of similar size. On a 1000 vertex instance the runtime factor is already about 10^27. Here we provide instances with up to 200 vertices \nfrom our family in TSPLIB format. We also provide code for generating these instances for an arbitrary number of vertices. Finally we make all the .log-files available of the runs of Concorde we describe in our paper."},"dsDescriptionDate":{"typeName":"dsDescriptionDate","multiple":false,"typeClass":"primitive","value":"2024-05-21"}}]},{"typeName":"subject","multiple":true,"typeClass":"controlledVocabulary","value":["Computer and Information Science","Mathematical Sciences"]},{"typeName":"freeKeyword","multiple":true,"typeClass":"compound","value":[{"freeKeywordValue":{"typeName":"freeKeywordValue","multiple":false,"typeClass":"primitive","value":"Traveling Salesman Problem"}}]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"Hougardy, S., Zhong, X. Hard to solve instances of the Euclidean Traveling Salesman Problem. Math. Prog. 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