Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Nc3/3...g6/4. d4/4...exd4/5. Nd5

4. d4 exd4 5. Nd5 - Three Knights, Steinitz, Steinitz-Rosenthal Variation Three Knights, Steinitz, Steinitz-Rosenthal Variation rd bd qd kd bd nd rd pd pd pd pd pd pd nd pd nl pd pl nl pl pl pl pl pl pl rl bl ql kl bl rl 1. e4 e5 2.Nf3 Nc6 3.Nc3 g6 4. d4 exd4 5. Nd5 C46 The move order 4. d4 exd4 5. Nd5 after 3...g6 is the Steinitz-Rosenthal Variation and is a line for White which sacrifices a pawn for aggressive play in the center and active development. 5...Bg7 line Three Knights, Steinitz, Steinitz-Rosenthal Variation, 5...Bg7 rd bd qd kd nd rd pd pd pd pd pd bd pd nd pd nl pd pl nl pl pl pl pl pl pl rl bl ql kl bl rl 1. e4 e5 2.Nf3 Nc6 3.Nc3 g6 4. d4 exd4 5. Nd5 Bg7 C46 The move 5...Bg7 by black ignores White's aggressive knight on d5 and decides to fianchetto their bishop on the kingside, just as planned by Black's third move, g6. 5...Nf6 line Three Knights, Steinitz, Steinitz-Rosenthal Variation, 5...Nf6 rd bd qd kd bd rd pd pd pd pd pd pd nd nd pd nl pd pl nl pl pl pl pl pl pl rl bl ql kl bl rl 1. e4 e5 2.Nf3 Nc6 3.Nc3 g6 4. d4 exd4 5. Nd5 Nf6 C46 With black's fifth move 5...Nf6 black aims to trade White's strong knight for black's normal knight. It also attacks the e4 pawn, which forces white to trade the knights now or a couple of moves later. 1. e4 e5 2. Nf3 Nc6 3. Nc3 g6 4. d4 exd4 5. Nd5