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Petroff Defence : ウィキペディア英語版
Petrov's Defence

Petrov's Defence (also called Petroff's Defence, Russian Game and Russian Defence) is a chess opening characterised by the following moves:
:1. e4 e5
:2. Nf3 Nf6
Though this symmetrical response has a long history, it was first popularised by Alexander Petrov, a Russian chess player of the mid-19th century. In recognition of the early investigations by the Russian masters Petrov and Carl Jaenisch, this opening is called the Russian Game in some countries.
The Petrov has a reputation of being dull and uninspired. However, it offers attacking opportunities for both sides, and a few lines are quite sharp. Often a trade occurs and Black, after gaining a tempo, has a well-placed knight. Pillsbury's game in 1895〔Lasker vs Pillsbury, 1895, 0–1 http://www.chessgames.com/perl/chessgame?gid=1109091〕 against Emanuel Lasker testifies to this. The Black counterattack in the centre also avoids the Ruy Lopez, Giuoco Piano (and other lines of the Italian Game), and the Scotch Game. Grandmasters Karpov, Yusupov, Smyslov, Marshall, Kramnik, and Pillsbury have frequently played the Petrov as Black.
The ECO codes for Petrov's Defence are C43 (for 3.d4) and C42 (for all other lines).〔
*〕
==White's third move==
White has four main choices for his third move:
* 3.Nc3, which may transpose to the Four Knights Game or the Three Knights Game
* 3.Bc4, which may lead to the Boden–Kieseritzky Gambit or transpose to the Two Knights Defence
* 3.Nxe5, the Classical variation
* 3.d4, the Steinitz Variation
White usually prefers 3.Nxe5, 3.Nc3, or 3.d4.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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