Instance Created:  April 26, 2002
Number of Cities:  29514
Status:  OPEN
Best Tour:  80353
Best Lower Bound:  xxx

History

Date	Gap	Lower Bound	Tour
02.02.03			80377 - Found by Keld Helsgaun, using a variant of LKH.
16.03.03			80371 - Found by Hung Dinh Nguyen using a parallel hybrid genetic algorithm.
07.07.04			80361 - Found by Keld Helsgaun, using a variant of LKH.
xx.xx.xx			80356 - Found by Keld Helsgaun, using a variant of LKH.
10.11.08			80355 - Found by Changxing Dong, Gerold Jaeger, Paul Molitor and Dirk Richter using LKH2 with an extended candidate set.
11.27.08			80353 - Found by Keld Helsgaun, using 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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