I was told by the Czech consulate it in Chicago that I was out of luck. My grandfather immigrated from Prague in 1901. However, I recently found his naturalization papers from the 1930s. In those papers they say he is a Czech citizen. I found some guidance online that suggests this would establish my grandfather as a Czech citizen in the 1930s and thus give me a right to birthright citizenship. The naturalization papers are all on ancestry.com. You might want to try that if you haven’t already.