Some theory today. If in the Blackmar-Diemer Gambit Teichmann 5.Nxf3 Bg4 we see the unusual retreat 6.h3 Bf5, it becomes in effect a Gunderam 5.Nxf3 Bf5 with an extra h2-h3 move for White. All this is moot after 7.Ne5 e6 8.g4 if Black plays the solid 8...Bg6. Then 9.Bg2 c6 10.h4 reaches an important position that can come from either a Teichmann or a Gunderam (in one less move). Here White has full compensation for the pawn.
Ken Wieder in the Finals of the USCF 1989 Golden Squires Postal Chess Tournament decided to play much sharper with 8...Ne4!? In this BDG Teichmann, fireworks ensued. The line in the notes with 9.gxf5 demonstrates a key difference between the 8...Ne4 Teichmann and the 7...Ne4 Gunderam. The White h-pawn being on h3 instead of h2 allows two queen checks that prepare two knight forks, leading to a very difficult endgame. I chose another complicated line and won quickly when Black missed a tactic.
Sawyer (2004) - Wieder (1862), corr USCF 89SF10, 17.08.1992 begins 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bf5 7.Ne5 e6 8.g4 Ne4 9.Bb5+ [The other choice is also playable but very unbalanced: 9.gxf5 Qh4+ 10.Ke2 Ng3+ 11.Kf2 Nxh1+ 12.Kg2 f6 13.Nf3 Qxh3+! 14.Kxh3 Nf2+ 15.Kg2 Nxd1 16.Nxd1 exf5 17.Ne3 Nc6 18.Nxf5=] 9...c6 10.0-0 cxb5 [The correct way to equalize for Black is 10...Nxc3! 11.bxc3 Bg6 12.Bd3 Nd7 13.Nxg6 hxg6 14.Qf3 Qf6=] 11.gxf5 Nxc3 [11...Nf6 12.Bg5+/-] 12.bxc3 f6? [12...Nc6 13.fxe6 Nxe5 14.Qh5!+/-] 13.Qh5+ g6 14.fxg6 1-0
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