1- : the main difference is that ...e5 gives more support to a kingside attack, but ...c5 does not block the g7 bishop. For instance, in the Saemisch variation (White plays f3 and follows by a kind of Yugoslav attack - cf. the Dragon Sicilian) ...e5 is often a mistake because Black has to create problems on the queenside if White castles here.
2- That order of moves is a bit odd. But anyways, White refrains from playing d5 as long as he can because it would block the center ; as long as the center is not blocked Black cannot attack on the kingside by ...f5. Additionnaly, the knight is better on d7 than e7 because it keeps an eye on the c5 square. Sometimes even (7...Nc6 8.d5) 8...Nb8 is played, precisely to play that knight on e7.
EDIT : of course I forgot to mention that ...Nc6, attacking d4, more or less forces d5.
hey!
I'm qute new to KID and I tried so study some principles of the opening. However I still don't understand some things.
Could you help me out with that? :)
1) When should I use c5 and when e5? What is the main difference? When do you use which line?
I think e5 is better since black in most lines tries to attack on the king side (f7-f5-f4) and e5 pawn is great for support, right?
2) second question is why in the game: 1. d4 Nf6 2.c4 g6 3. Nf3 Bg7 4. Nc3 0-0 5. e4 d6 6. Be2 e5 white plays 7. 0-0 Nc6 8. d5 Ne7 instead of 7. d5 ? 7. d5 seems for me more logical since it restricts the Nb8 and it only can be developed on d7 which blocks Bc8.
Thank you