Nottingham: Chess Player, 1980. — 48 p. — ISBN 0-906042-21-6.
M. Thomas, who wrote the best extended consideration of these lines from White's perspective 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Bc4 Bg7 5.Qe2. recommended this variation and was the first and last to explore its intricacies. As he wrote:"This system is ideal for club and tournament players because it is of a sharp tactical nature and weak opening play by Black is rapidly punished." What's more, while Black has at least one likely equalizing line, even with best play he must concede White a significant initiative or space advantage.