Michael Ventris and John Chadwick performed the bulk of the decipherment of Linear B between 1951 and 1953. At first Ventris chose his own numbering method, but later switched to Bennett's system. His initial decipherment was achieved using Kober's classification tables, to which he applied his own theories. Some Linear B tablets had been discovered on the Greek mainland. Noticing that certain symbol combinations appeared only on the tablets found in Crete, he conjectured that these might be names of places on the island. This proved to be correct. Working with the symbols he could decipher from this, Ventris soon unlocked much text and determined that the underlying language of Linear B was in fact Greek. This contradicted general scientific views of the time, and indeed Ventris himself had previously agreed with Evans' hypothesis that Linear B was not Greek.