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The Bishop's Opening is a chess opening that begins with the moves: . 1. e4 e5 2. Bc4. White attacks Black's f7-square and prevents Black from advancing the d-pawn to d5. By ignoring the beginner's maxim "develop knights before bishops", White leaves their f-pawn unblocked, preserving the possibility of f2–f4.
One of the most notable proponents was the Soviet player Alexei Pavlovich Sokolsky (1908–1969), who often used it in high-level play. Sokolsky wrote a monograph on the opening in 1963, Debyut 1 b2–b4, which would lead to the opening being called the "Sokolsky Opening". Sokolsky's work defended the viability of the opening even at the ...
The Four Knights Game is a chess opening that begins with the moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6. This is the most common sequence, but the knights may develop in any order to reach the same position. The opening is fairly popular with beginners who strictly adhere to the opening principle: "Develop knights before bishops."
The opening is the initial stage of a chess game. It usually consists of established theory.The other phases are the middlegame and the endgame. [1] Many opening sequences, known as openings, have standard names such as "Sicilian Defense".
A diagnosis of vitamin B 12 deficiency is determined by blood levels lower than 200 or 250 picograms per ml (148 or 185 picomoles per liter). Measurement of blood methylmalonic acid (MMA), a vitamin B 12-associated metabolite, is a commonly used biomarker. [2] Deficiency is often suspected first, as diagnosis usually requires several tests.
White's 1.d3 releases their c1-bishop and makes a modest claim for the centre, but since it does not stake out as large a share of the centre as 1.d4 does, it is not a popular opening move. Of the twenty possible first moves for White, it ranks tenth in popularity.
In general, if 6...b5 7.Bb3 d6 8.c3, positions could resemble a traditional closed Spanish such as the Zaitsev, Flohr, Smyslov, Karpov, Breyer, or Chigorin where White has played 10.d3 (or in the case of the Chigorin, 11.d3 with 10.Bc2 c5 included) instead of 10.d4 (in the case of the Chigorin, 11.d4) if White plays Re1 and h3.
The Stonewall Attack is a chess opening characterized by White playing pawns to d4 and e3, bishop to d3, knight to d2, and then completing the Stonewall structure by playing pawns to c3 and f4. This set-up is usually achieved by a 1.d4 move order but transposition is also possible via Bird's Opening , 1.f4.