sometimes, those "weaker opponents" tend to surprise me with their attacking lines, so I stick to the Petroff.
Back in the days when I used to defend the Spanish Game, I chose the Moller Variation of the Ruy Lopez or the Breyer Variation. But now, I use the Petroff defense most of the time because its full of tactics
It is arguable that if you are in a must win situation as black, then you should avoid 1...e5 against 1.e4 altogether in favour of a more imbalancing choice, such as 1...c5. I was just curious as to what you guys think is the best fighting choice against the Ruy Lopez from black's point of view. I don't necessarily plan on taking up this line, but since I am learning the opening for both sides (especially white) I think it would make for a good discussion topic. For all you die-hard 1...e5 players, what do you guys turn to when you need to create positional imbalances necessary to outplay a weaker opponent, without making serious concessions.
I am basically taking a theoretical standpoint here, meaning that with best play what defences do you think leave black with enough scope to play for a win? Assuming both players know the theory quite well and play at a reasonably high level. Personally, I think the Berlin is quite a good choice as it leads to an imbalanced endgame, and white can't just simplify to a completely lifeless position if he wishes. I know Aronian has scored quite a few wins at the top level with this defence.
It seems like the sharp attacking lines, such as the schlieman or Marshall, leave black defending a worse endgame with best play, often a pawn down in exchange for two bishops, and aren't ideal for playing for a win. In many of the closed lines it seems like it is tough for black to do anything if white doesn't overpress, and white often gets a small but persistent initiative on both sides of the board, while black just defends and trys to neutralize the pressure. So what do you guys view as black's best choices in a must win situation?