Well, I don’t really know anything about these two A40 lines, but they’re surely not really of equal interest. The so-called Dunworth Defence (how often has Mr Dunworth played it? – according to ChessLive, not at all!) looks to be a bit of a one-trick pony. After 1 d4 g6 2 c4 Bg7 3 e4 d5 4 ed c6 5 dc Bd4, the main line seems to be 6 cb Bb7 7 Bb5 Bc6 8 Bc6 Nc6 9 Ne2, e.g. 9 …Nf6 10 0-0 Be5 11 Nbc3 0-0 12 Qa4 Rc8 (or 12 …Nd4 13 f4 Nd2 14 Ne2 Qb6 15 Kh1 Bc7 16 Nc3 Rfd8 17 Qc2 Rac8) 13 Nc3 Qc7 14 f4 Qb6 15 Kh1 Bc3 16 Nc3 0-0. One feels White should be able to beat Black back, but it’s very tricky and messy and not much fun for White – in short the perfect (occasional) blitz opening.

The “Beefeater” (1 d4 g6 2 c4 Bg7 3 Nc3 c5 4 d5 Bc3 5 bc f5) is another matter, a sharp system of real strategic interest. It was championed, I believe, by David Norwood (did he invent the name? – it was new to me), but the only other thing I know about it is that Speelman, in his 2000 book on the Modern Defence co-authored with Neil McDonald, says (p. 156) that after 6 h4 Nf6 7 h5 Rg8 8 hg hg, White has 9 Qa4! (rather than 9 Nf3 which Burgess, in NCO published the previous year, calls unclear after 9 …Qa5), which he says is “very annoying here, though not necessarily fatal”. In practice, 9 Qa4 has usually been met by 9 …Qb6 with the possible idea of …Qb6—a6 or …Nf6—e4 and …Qb6—f6, with which Black has usually done fine in the few games in which it’s been played.

Anyone care to comment on these lines?

"1. d4, g6 2. c4, Bg7 3. e4, d5"
3..d5... really? I guess 3..d5 should be c5 or something, right