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The Modern Defense (also known as the Robatsch Defence after Karl Robatsch) is a hypermodern chess opening in which Black allows White to occupy the center with pawns on d4 and e4, then proceeds to attack and undermine this "ideal" center without attempting to occupy it. The Modern Defense usually starts with the opening moves: 1. e4 g6
The latter promises a tactical melee, with a common line being 6.Bb5+ Bd7 7.e5 Ng4 8.e6 (8.h3 or 8.Bxd7+ are other possibilities) 8...fxe6, which was thought bad, until Yasser Seirawan played the move against Gyula Sax in 1988 [9] (8...Bxb5 is the alternative, if Black does not want the forced draw in the main line), continuing 9.Ng5 Bxb5!
Alekhine's Defence is a chess opening that begins with the moves: . 1. e4 Nf6. Black tempts White's pawns forward to form a broad pawn centre, with plans to undermine and attack the white structure later in the spirit of hypermodern defence.
According to Jeff Sonas' Chessmetrics rating system, Geller was ranked No. 2 in the world May–July 1963, and was in the world's top ten for much of the 1950s and 1960s. [3] After FIDE adopted the Elo rating system in 1971, Geller appeared in the top 10 three times: in 1971 (equal 6th, 2630), 1976 (equal 8th, 2620) and 1981 (equal 10th, 2615).
According to Jim Bickford, [1] one of the characteristics of this defense is the "cork-screw" maneuver the knight makes by traveling to the second rank via f6 and h5. In the introduction to his monograph, Bickford quotes the late Tony Miles as saying "The black knights are better on the second rank – a shame it takes two moves for them to get there."
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The system engages targets within 50 metres (55 yd) of the vehicle it is defending, and the ammunition detonates at around 1.5 metres (1.6 yd) from the threat. [11] It will engage any threat approaching the tank between the velocities of 70 metres per second (230 ft/s) and 700 metres per second (2,300 ft/s), and can disregard false targets ...