Google Now #1 Search Engine In Czech Republic 5 Countries To Global Domination
searchengineland.com
searchengineland.com
In general, I find Google's image search to be one of their weakest areas, even in English.
(I work at seznam.cz, not on anything search-related.)
Because of that, a reason could be that it is hard to split the statistics between those states because many Slovaks will use a Czechian search engine.
the other engines have only one site for the two countries, so that already have data for the Czech Republic and Slovakia combined. They should have mentioned it.
They do mention the following, though: It beats the aggregate share of Seznam.cz and two other Seznam sites, so it seems that comparison at least is/may be fair.
Things (for a mass public) gets very different when you see a TV ad. (Before 2006 or so, google didn't even try to claim google.cz domain name, which was by that time occupied by some squatters or something.)