He often put on blindfold exhibitions. In one he scored eight wins, two draws and two losses including this game: G. Deurer – Alexander Fritz 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 d6 5.c3 Bg4 6.Qb3 Bxf3 7.Bxf7+ Kf8 8.Bxg8 Rxg8 9.gxf3 Qc8 10.Kh1 g5!? 11.d3 g4! 12.f4 g3!! 13.fxg3 Qh3 14.Rf3 Rxg3!! 0-1
His name is attached to the Fritz Variation in the Two Knights Defense or Prussian Game (1e4 e5 2Nf3 Nc6 3Bc4 Nf6 4Ng5 d5 5exd5 Nd4).