Qf3+ are all possible, with positions similar to the line of the Two Knights Defense beginning 1.

Against the Two Knights defense, the line 1.

Ne5 Bd6 (this is considered to be the main line of the Two Knights Defense).

Estrin wrote several chess books and was an authority on the Two Knights Defense.

The variation of the Two Knights Defense 1.

This is the Two Knights Defense where White has chosen the offensive line 4.

It follows the main line of the Two Knights defense for the first ten moves, and is characterized by the moves 10.

The Two Knights Defense is a chess opening that begins with the moves:

Nf3 gives a reversed Two Knights Defense.

His name is attached to the Colman Variation of the Two Knights Defense (1.

Black can also decline the pawn with 3...Nc6, transposing into the Two Knights Defense.

Transpositions into Giuoco Piano and Two Knights Defense and other openings are also possible.

Players willing to speculate choose the Two Knights Defense, 3 . . . Nf6, a cantankerous gambit.

In the Two Knights Defense the Knorre variation (ECO code C59) is named after him.

This colourfully named opening is a variation of the Two Knights Defense in which White sacrifices a knight for a superficially impressive attack on Black's king.

Apartsev vs Igor Arkadievich Zaitsev, Moscow 1963, Italian Game: Two Knights Defense.

The more aggressive Two Knights Defense; again, this is more in the nature of a counterattack, and some (e.g. Chigorin) have proposed it be renamed so.

Wilkes-Barre Variation, Two Knights Defense by Yakov Estrin, Chess Enterprises (June 1978).

His game with Hans Berliner in which Berliner played the Two Knights Defense and defeated Estrin is one of the most famous and important games in correspondence chess.

Always refers to an opening chosen by Black, such as Two Knights Defense or King's Indian Defense, unless, of course, it has 'reversed' in front of it, which makes it an opening for White.

Sometimes used to describe an aggressive or provocative variation such as the Albin-Chatard Attack (or Chatard-Alekhine Attack), the Fried Liver Attack in the Two Knights Defense, and the Grob Attack.

The Max Lange Attack is a chess opening that can arise from many different opening lines, including the Two Knights Defense, Petroff's Defense, Scotch Gambit, Bishop's Opening, Center Game, and Giuoco Piano.