Ruy Lopez, Modern Steinitz Defense

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This article uses algebraic notation to describe chess moves.
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a8 b8 c8 d8 e8 f8 g8 h8
a7 b7 c7 d7 e7 f7 g7 h7
a6 b6 c6 d6 e6 f6 g6 h6
a5 b5 c5 d5 e5 f5 g5 h5
a4 b4 c4 d4 e4 f4 g4 h4
a3 b3 c3 d3 e3 f3 g3 h3
a2 b2 c2 d2 e2 f2 g2 h2
a1 b1 c1 d1 e1 f1 g1 h1
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Ruy Lopez, Modern Steinitz Defense

In chess, C71 is the ECO code for the Ruy Lopez, Modern Steinitz Defense chess opening. The game begins 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6. Black's object here is to drive White's bishop to a less effectual diagonal and have more freedom. White has trouble keeping the initiative but has a number of ways to proceed. Paul Keres scored +24=25-2 as Black with this opening.

There are six ECO classifications for the Modern Steinitz. C71 is concerned with White's responses, 5.d4, 5.Nc3 and 5.c4. C72 is restricted to continuations of 5.0-0. C73 is a delayed exchange variation - 5.Bxc6 bxc6 6.d4. C74-C76 all begin with 5.c3. C74 covers 5...Nf6 but primarily focuses on 5...f5 6.exf5 Bxf5 with 7.d4 or 7.0-0. C75's main continuation is 5...Bd7 6.d4 Nge7, the Rubenstein Variation. C76 is characterized by the fianchettoed Black kingside: 5...Bd7 6.d4 g6.

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