MNb wrote on 03/26/07 at 20:31:19:
Nunn (1996) writes "it turns out that 12.Qg3 is an improvement over the immediate Nd5. If Black castles queenside, then White has a dangerous sacrifice on b5; therefor Black is almost forced to play 12...b4, when White plays his Nd5 sacrifice with an extra tempo. Unfortunately for White, even this improved version appears inadequate for more than a draw."
In that Bjorqvist-Svensson game Nunn suggests 18...Ng7 19.e6 Nc5 20.exf7+ Kxf7 21.Rf1+ Kg8 "and it is hard to believe that White has enough for the piece." In the margin I have added 22.Kb1 Re8 23.Qf6 Qe7 24.Qb6 Nge7 25.Rde1 Qc7.
18.e6 (iso 18.g4) Nc5 and 16.e6 (iso 16.Qh4) both draw according to Nunn.
Thanks very much for the info, MNb.
The line Nunn suggests to the Bjorqvist game is taken from Weigel-Hauernherm - 14th West German Junior Corres Ch 1974/77. Dont know where black went wrong after move 21 cos he eventually lost.
Just to compare notes, according to RHM Survey:
1) 18...Ng7 is given a (?) & recommends 18...h6!. Possible continuation might be 19.Qe3 Ng7 20.e6 0-0-0 21.exd7+ Rxd7 =
2) 18.e6 Ktdf6 is unclear & no elaboration here. Does Nunn have any suggestions on this?
3) 16.e6?! Nxg3 17.exf7+ Kxf7 18.Rxe7 Kg8 19.hxg3 Rc8! 20.Ne6 Qe5 -+ as opposed to Nunn (draw)
Quote:Maybe Woofwoof's decision to abandon this is too early?
Oh I dunno! It does look on 1st impressions like black has to survive quite a violent storm to get a draw. Seems like everything works out to a draw w/o any errors from black!