Chess Assistant 17 & Chess Assistant 17 PRO
Chess Assistant 17 combines advanced game database management, analysis powered by the strongest Houdini 5 engine, the advanced Tree mode, Opening Encyclopedia and many other features.

Chess Assistant 17 with Houdini 5 — $94.95 / €75.96
Chess Assistant 17 PRO with Houdini 5 PRO — $145.95 / €116.76

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Highlights from the Rybka Aquarium book

Sicilian Najdorf: 6. Bg5 running out of favour?

In 2007 the sharp 6. Bg5 in the Sicilian Najdorf featured a nice comeback. White players delivered some heavy blows at the very popular Poisoned Pawn variation, black’s most respected line against 6. Bg5. Two years later black has been able to come up with 3 reliable answers against white’s most dangerous plan:
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2 9.Rb1 Qa3 10.e5 h6 11.Bh4 dxe5 12.fxe5
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