5...b5 6.Bf1 Nd4 7.c3 Nxd5 8.Ne4 Qh4 9.Ng3 Bg4 10.f3 e4 11.cxd4 Y Estrin vs H Berliner, 1965  (C57) Two Knights, 42 moves, 0-1 8.Qf3 cxb5 9.Qxa8 Bc5 10.O-O O-O 11.b4 Bxb4 12.Nc3 Nh5 13.Nf3 Bogoljubov vs Euwe, 1941  (C58) Two Knights, 23 moves, 1-0 8.Bd3 Ng4 9.Ne4 f5 10.Be2 h5 11.h3 fxe4 12.hxg4 Bc5 13.Nc3 Qd4 Vitiugov vs Grischuk, 2019  (C58) Two Knights, 45 moves, 1/2-1/2 8.Bf1 h6 9.Nh3 Bc5 10.d3 Qb6 11.Qe2 Bg4 12.f3 Bxh3 13.gxh3 000 Steinitz vs Chigorin, 1892  (C58) Two Knights, 24 moves, 0-1 4 games