Instance Created:  April 26, 2002
Number of Cities:  436
Optimal Value:  1443
Solved:  April 29, 2002
Solution Method:  Concorde, QSopt LP solver
Solution Time:  31.1 seconds, AMD Athlon 1900+

History

Date	Gap	Lower Bound	Tour
4.29.02	Optimal	1443 - Concorde (defaults), using QSopt as an LP solver. The run was carried out on a single AMD Althlon 1900+ processor (1.6 GHz), in 31.1 seconds, using 1 nodes in the branch-and-bound tree.	1443 - Found during branching run by Lin-Kernighan heuristic.

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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