Опасно! Волк! Chigorin the great Russian world championship candidate seems to have been unable to play against the Viennese master Heinrich Wolf. Wolf was undoubtedly a strong player, but as his scores against Chigorin's peers shows he had disproportionate success against the Russian champion.

Pillsbury beat Wolf 4 to 0, with 2 draws.
Maroczy beat Wolf 11 to 1, with 4 draws.
Tarrasch beat Wolf 5 to 0, with 6 draws.
Schlechter beat Wolf 10 to 0, with 6 draws.

So why did Chigorin fare so badly against Wolf? Chigorin's alcoholism and poor health (diabetes) must have contributed to the sharp decline in his powers evident from 1904, but even so his record against Wolf is extraordinarily bad.