Instance Created:  April 26, 2002
Number of Cities:  34656
Status:  OPEN
Best Tour:  99159
Best Lower Bound:  xxx

History

Date	Gap	Lower Bound	Tour
2.2.03			99189 - Found by Keld Helsgaun, using a variant of LKH.
3.16.03			99188 - Found by Hung Dinh Nguyen using a hybrid genetic algorithm, starting with the above tour.
18.3.03			99181 - Found by Keld Helsgaun, using a variant of LKH.
15.5.07			99172 - Found by Keld Helsgaun, using a variant of LKH.
7.4.08			99161 - Found by Keld Helsgaun, using a variant of LKH.
30.06.08			99159 - Found by Changxing Dong, Gerold Jaeger, Paul Molitor, Dirk Richter on an AMD Opteron 2,6 GHz by a variant of LKH.

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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