Thank you for your nice explanation
Pirc defense, Czech variation - is it good
Maybe this Video is a good starting point: https://www.youtube.com/watch?v=3WD82x1YBlg
Interesting synopsis.
The line above is rubbish. 1.e4 d6 2.d4 Nf6 3.Nc3 c6 4.f4 Qa5! 5.Bd3 e5 6.Nf3 Bg4 7.Be3?! ef4! 8.Bf4 Qb4
A. 9. 0-0 Bf3! 10.Qf3 Qd4+ 11. Kh1 Nbd7! . .with iron control over the e5 square. A subsequent and timely . .Ne5 should see black through any difficulty.
B.1. 9. a3! Qb2? (recommended by some masters incredibly enough) 10.Na4 Bf3! 11.gf3 Qd4 12.c3! wins the black Queen.1-0
B.2. 9.a3! Bf3! and now 10.Qf3? Qb2. 1-0 10. gf3 Qd4 followed by . .Nbd7 (Wheres whites compensation?) and finally, 10. ab4! (best) . .Bd1 11. Td1 d5! with nothing to fear i.e. 12. b5 Bb4! with equal chances.
B.2 10.gf looks fine for White. Black only has developed a knight on f6 and a queen on d4 that's going to be kicked again for another free tempo and Black's king is still in the center. Black is going to have to figure out how to complete develop while White has an initiative. ...Nbd7 is a nice start but there are still 3 other pieces that still aren't doing anything.
The line above is rubbish. 1.e4 d6 2.d4 Nf6 3.Nc3 c6 4.f4 Qa5! 5.Bd3 e5 6.Nf3 Bg4 7.Be3?! ef4! 8.Bf4 Qb4
A. 9. 0-0 Bf3! 10.Qf3 Qd4+ 11. Kh1 Nbd7! . .with iron control over the e5 square. A subsequent and timely . .Ne5 should see black through any difficulty.
B.1. 9. a3! Qb2? (recommended by some masters incredibly enough) 10.Na4 Bf3! 11.gf3 Qd4 12.c3! wins the black Queen.1-0
B.2. 9.a3! Bf3! and now 10.Qf3? Qb2. 1-0 10. gf3 Qd4 followed by . .Nbd7 (Wheres whites compensation?) and finally, 10. ab4! (best) . .Bd1 11. Td1 d5! with nothing to fear i.e. 12. b5 Bb4! with equal chances.
The line above is mighty good for white- the only sensible reply to 7.,Be3 is 7...Nbd7, taking at d4 or f4 is positionally extremely shaky.
Why 9.a3?
It's known since some thirty years ago that 9.Qd2 is very strong.
Does that mean that sticking with the regular Pirc lines is better, with an occasional use of the Czech more for surprise purposes?
The line above is rubbish. 1.e4 d6 2.d4 Nf6 3.Nc3 c6 4.f4 Qa5! 5.Bd3 e5 6.Nf3 Bg4 7.Be3?! ef4! 8.Bf4 Qb4
A. 9. 0-0 Bf3! 10.Qf3 Qd4+ 11. Kh1 Nbd7! . .with iron control over the e5 square. A subsequent and timely . .Ne5 should see black through any difficulty.
B.1. 9. a3! Qb2? (recommended by some masters incredibly enough) 10.Na4 Bf3! 11.gf3 Qd4 12.c3! wins the black Queen.1-0
B.2. 9.a3! Bf3! and now 10.Qf3? Qb2. 1-0 10. gf3 Qd4 followed by . .Nbd7 (Wheres whites compensation?) and finally, 10. ab4! (best) . .Bd1 11. Td1 d5! with nothing to fear i.e. 12. b5 Bb4! with equal chances.
why not 8...Qb6 instead of Qb4?
Literature about the Czech Prybil : "d6 move by move" by Lakdawala is based on that. However, I question why everyone likes 4...Qa5 after f4. It leads to very complex lines. 4...d5 is safer, more positional, and scores better for Black than Qa5.
The Qa5 lines, while less safe are going to be harder for white to figure out over the board. I think the video link in post #4 show that a little bit. It also appears that intuitive moves for white may not be the best in some lines. I think the person who understands the Qa5 line better is going to come out on top of the battle. That being said....if your strength is a positional approach, then using 4....d5 would play to your strengths.
It's also likely that because Akobian discusses this people "like" it more.
Why play c6?