Instance Created:  April 26, 2002
Number of Cities:  59296
Status:  OPEN
Best Tour:  165371
Best Lower Bound:  xxx

History

Date	Gap	Lower Bound	Tour
2.2.03			165450 - Found by Keld Helsgaun, using a variant of LKH.
16.3.03			165445 - Found by Hung Dinh Nguyen using a hybrid genetic algorithm, starting with the above tour.
21.3.03			165444 - Found by Hung Dinh Nguyen using a hybrid genetic algorithm, starting with the above tour.
5.3.03			165440 - Found by Keld Helsgaun, using a variant of LKH.
25.7.08			165372 - Found by Keld Helsgaun, using LKH 2.
4.10.12			165371 - Found by Xavier Clarist.

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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