Two Knights Defence

First recorded by Polerio (c. 1550 – c. 1610) in the late 16th century, this line of the Italian Game was extensively developed in the 19th century. Black's third move is a more aggressive defense than the Giuoco Piano which would result from 3...Bc5. Black invites White to attack his f7-pawn with 4. Ng5. If White accepts the offer, the game quickly takes on a tactical character: Black is practically forced to give up a pawn for the initiative. The complications are such that David Bronstein suggested that the term 'defense' does not fit, and that the name 'Chigorin Counterattack' would be more appropriate. The Two Knights has been adopted as Black by many aggressive players including Mikhail Chigorin and Paul Keres, and World Champions Mikhail Tal and Boris Spassky. In modern grandmaster play, 3.Bc4 is far less common than 3.Bb5 and the more solid 3...Bc5 is the usual reply, so the Two Knights Defense is infrequently seen. It remains popular with amateur players. Wikipedia
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