hicetnunc wrote on 05/27/20 at 18:39:07:
One of the inconsistencies I have in my chessable version is that in the introduction of the line 1.c4 e5 2.g3 Nf6 3.Bg2 Bc5, he gives 4.Nc3 Nc6 5.a3 (and stops there), while in the other ...Bc5 variations, he gives e3 without a3. If you haven't this problem in your ebook, then your version is better than mine.
I'm rather confused here -- can you or anyone else help? I'm not sure which other ...Bc5 line(s) you mean, but after 1 c4 e5 2 g3 Nf6 3 Bg2 Bc5 4 Nc3, Sielecki's
Chess24 'main line'* is
4 ...0-0 5 e3 and now 5 ...c6, because, he says, after 5 ...Nc6 White can play 6 Nge2 dispensing with the inessential a2-a3 -- whereas after 4 ...Nc6 he gives 5 a3 as transposing to 3 ...Nc6 4 Nc3 Bc5 5 a3 (5 e3?! d5!). I've always found these lines rather murky: can you or anyone else tell us why ...d5 is inferior on move six with Nge2/...0-0 in? -- it's been tried by some strong players, with mixed results.
* I put 'main line' in quotes because S. chooses this in order to "stay similar to other lines", but
also briefly covers 5 Nf3!?, which he suggests is perhaps theoretically strongest.