Instance Created:  April 26, 2002
Number of Cities:  9698
Optimal Value:  27724
Solved:  April 16, 2017

History

Date	Gap	Lower Bound	Tour
10.6.02			27724 - Best of 10 runs of LKH, each with n trials. Total running time 70172 seconds on an AMD Althlon 1900+ processor (1.6 GHz).
12.4.17	Optimal	27724 - Concorde (-Z1 -J4), using CPLEX as an LP solver. Wall-clock time for the branch-and-cut search was 1.3 days on a 48-core Intel Xeon E5-2620 @ 2.00GHz cluster; search tree contained 1,085 nodes.

Notes

1. Concorde is our linear-programming based TSP solver.

2. linkern is an implementation of Martin, Otto, and Felten's Chained Lin-Kernighan heuristic. It is included in the Concorde code.

3. LKH is Keld Helsgaun's powerful implementation of the Lin-Kernighan heuristic.

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