Johann Baptist Allgaier

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What Wikipedia says

Johann Baptist Allgaier (June 19, 1763, Schussenried – January 3, 1823, Vienna) was a German-Austrian chess master and theoretician. He was also the author of the first chess handbook in German – Neue theoretisch-praktische Anweisung zum Schachspiel (Vienna 1795–96).

Excerpt from the Wikipedia article “Johann Baptist Allgaier”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: DaQuirin, Public domain, via Wikimedia Commons.