German chess master and author who is known as a great strategist and problemist.
During World War I, he fought in eastern front, where he was captured by Russians, and taken as a prisoner of war.
He published two books on chess, in 1926 and 1928, that are still used in study today.
His father was an Austrian Military Officer.
He has had a great impact on the modern game like Savielly Tartakower.