I agree with Glen. 9. Nbd2 is an excellent way to avoid the Dilworth and the Dilworth is precisely the reason why many players, including Kasparov, have switched to 9. Nbd2 as their main weapon against the Open Ruy Lopez. With regard to the Schliemann, I think it's main success over the years has been to the fact that it, like it's close relative, the Latvian Gambit, is generally a surprise for white players. However, a well-prepared player will score very highly with White against the Schliemann and I firmly believe that white should get the upper hand. My general feeling is that Black usually cannot get very agressive early on if he plays 1...e5 because the symmetrical structure favors white since he is ahead in development and, because he moves first, he is effectively a tempo up. Throughout the years, "agressive" lines for Black have slowly faded out of popularity: The Elephant Gambit, Latvian Gambit, Schliemann, Archangel, and Zaitsev lines have all faded in popularity over the last decade. So long as White knows the main lines and sticks with them. This does not mean that 1...e5 is a bad opening, far from it. It is just that it seems to be an opening balanced between the solid structure of, for example, the Caro-Kann and the unbalanced positions of the Sicilian and that Black must walk a fine line between solid, positonal play and active play and that if he leans too much to either side, he will be squeezed positonally because of his passivity, or crushed for playing a premature attack. However, if Black is able to walk the tight-rope, then he can often get a strong attack if white overextends is is not cautious enough or can get a positional advantage if White becomes too passive. The only problem is that I feel that White has a bit more flexibility in his approaches while Black is pretty much obliged to focus his attention on preventing White's attacking/positional ambitions early on and that is not something everybody can do. It is probably best suited for those with positional yet active styles, such as Karpov and Anand who, coincidentally, have also wielded the Caro-Kann which may indicate a similarity in the way that black must be able to play the opening phase of the game. If you fit that mold, then 1...e5 is probably an excellent choice. If you are a very calm, quiet, positional player, then you probably want to lean more towards a Caro-Kann while if you are more aggressive you should probably seek a French or Sicilian. With regard to specific variations of the Ruy Lopez, I would have to say that the most solid ones are probably the Berlin, Open Variation, Chigorin Variation, and Marshall are probably Black's most solid options.
As for Khalifman's evaluations, having read through OFWATA Vol. 1 and skimmed through Vol. 2, I have to say that Khalifman's evaluations, though he supports them well, are probably a tad bit biased (as evaluations usually are in repertoire books). And even the Ruy Lopez does lead to a slight white advantage in EVERY line (which I find difficult to believe is possible for an opening that has been around for 400+ years), I agree with alumbrado that Khalifman offers many interesting suggestions that don't really have a lot of practical outings at the top levels of play and that even if a line is +=, it is definitely not easy for White to prove a CLEAR advantage, let alone win the game (having played the Sicilian Dragon from both sides of the board for many years, I can certainly testify to this!!!!).
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