r/TournamentChess • u/bolsastan • 10h ago
9..a5 in the Bb4+ Intermezzo line of the Catalan, one of the new big mainlines?
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. Bf4 a5 10. Rd1 a4
This line will not be a secret to some of you here, since it has been played by almost all top players facing the Catalan in the past few years (Nepo, Grischuk, Le in World Rapid for starters). Also, I can see that it's not super rare in the Lichess >2200 bracket.
Usually I would prefer to write about rare lines on this sub, but I was really happy to learn about this line recently and would like to share. I don't how to put it exactly, but facing the Catalan used to be frustrating.
Besides the line I mentioned in the diagram, 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 b6 9. Ne5 Bb7 10. Rd1 Nbd7 11. cxd5 cxd5, there are also lines like 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 Bb4+ 5.Bd2 Be7 6.Bg2 O-O 7.O-O c6 8.Qc2 Nbd7 9.Bf4 b6 10.cxd5 cxd5 11.Rc1 where White forces an early cxd5 cxd5 and then forces 30 boring moves of shuffling in a symmetrical structure because they have "the bishop pair" or "control of c-file" but really it's more akin to chess terrorism. It's really nice that 9..a5 solves this (with some caveats).
Now I may return to the Bb4+ Intermezzo lines again, based on the 9..a5 and 10..a4 idea, instead of the riskier tries I have been using against the Catalan. Honestly I am super out of depth with something so theoretical like the Catalan, so take what I wrote with a pinch of salt and do your own research :D
---
Additional note: While Black would indeed like to delay b7-b6 as long as possible... if Black does not manage to get in a4 before White plays b3, then Black will have to meet b2-b3 with b7-b6.
Example 1: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. b3 b6
Example 2: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. Bf4 a5 10. b3 b6
The reason is that White has supported c4-pawn with b2-b3, which signals their intention of Nc3 and e2-e4 next. Thus Black has to quickly play b7-b6 and Ba6 to renew the pressure on c4.