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True, you can't force White to take on e4 I don't think. I thought briefly about 22...e3!? initially, but don't think that it comes to anything as you can't arrange a good battery on the long diagonal (White sometimes has c3-c4). Still, at move 18 it really feels like Black has something to me. You have the two bishops, a safe king, sound structure, and White has weakened his kingside and light squares tremendously. He's also walking himself into a lot of pins, i.e. the c-pawn is pinned to the queen on c2, the knight is pinned to a queen on e4 if the pawn is captured, and the knight is pinned to the bishop on e3 after ...Bc5. Your ...g5 ideas might be fine, but they would certainly not be the first ones I considered. I want to keep Black's advantages of a safe (for now) king and sound structure. How about gaining space and creating weaknesses in White's queenside? I.e. creating a second weakness? I also like 18...b5 and 18...Rac8 very much, just creating pressure down the queenside files for Black's rooks. With enough queenside space, it's possible that a later ...e4-e3 pawn sac will work because Black will introduce a rook into the attack or be able to create the powerful Q+B battery. Something plausible like 18...b5 19.Rfe1 Rac8 20.Qe2 Qd5 21.a3 a5 still looks pretty good for Black, and you're keeping your two bishop advantage, not going into that opposite-colored bishops position you did in the game. That's just my take on the position. I'm not saying that I'm right and you wrong, but sometimes you just need to hear other people's ideas about a position to think a little differently. I really didn't like 18...Bc6 for some reason, partly because you aren't giving White enough chances to go wrong (accepting the sacrifice on e4), partly because you're blocking the c-file, and partly because I think that you can still "build" your position for a while (minority attack on the queenside). Your minority attack on the queenside has the benefit of opening another front, so that White can't as easily just "blockade the pawn then shove the kingside." In fact, I think that only in the pure opposite-colored bishop middlegame can White think about doing that, as then your bishop on c6 is too passive behind the blockading pawn. I also strongly disliked 28...b4, because after 29.c4 White is keeping the queenside lines closed while depriving you of access to b5 and d5 (some of the squared you need to put your queen on to get a light-squared counter attack working). Hmmm...I think that may be the crux, you needed open lines on the queenside for your rooks to distract White from his slow build-up.
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