What does four knights opening means in the game of chess?

Answer 1

The opening "Four-knights" is a variation of "King's Pawn Game", in which both players have equal control of the center and a lot of possibilities to continue the game.

The move sequence is 1. e2e4, e7e5, 2. nf3, nc6 3. nc3, nf6. a possible continuation would be 4. bc4, nxe4. Which is the Italian variation, from here white could play 5. nxe4 which black would respond with d7d5, forking the bishop and the knight.

White could also play 5. bxf7+, kxf7 and then 6. nxe4, d7d5. Keeping the material even and sacrificing the center to open black's kingside.