Wednesday, January 13, 2021

Blackmar-Diemer Teichmann Bg2

Are three pawns really worth a bishop? One Blackmar-Diemer Gambit line has White with a bishop vs Black’s three extra pawns. The Teichmann Retreat 5.Nxf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 gives White has two popular plans.

Plan A: 9.Qf3 c6 10.g5 when Black may play 10…Qxd4?! 11.Nxg6 hxg6 12.gxf6 gxf6 with three pawns for the bishop. My database has White scoring 84% score in 19 games.
Plan B: 9.Bg2 c6 10.h4. White has scored 60% in 258 games. Personally, I’ve played 9.Qf3 far more often, but theory recommends 9.Bg2 as being better.

The standard relative value scale for chess material calls a pawn worth one point and the bishop three points. True, but God and the devil are in the details to find the good or bad.

This well-played game reaches a line where White has a bishop for three pawns. Players do not have the luxury of time to calmly consider the best options. If it is possible for Black to save the game, he must get his queenside pawns on the dark squares while advancing kingside pawns and rushing the king to the center to prevent White from invading. That didn’t happen. White’s bishop picked off all three queenside pawns and pushed the a-pawn to win in the game Christophe Villeneuve vs Alexandre Dhieux.

Villeneuve – Dhieux, 1st Cappelle Online Blitz Europe-Echecs INT, 10.01.2021 begins 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.Bg2 c6 10.0–0 [10.h4 Bb4 11.0–0 Nbd7 12.Qe2 Nxe5 13.dxe5 Bc5+ 14.Kh2!=] 10...Nbd7 [10...Bd6 11.Qe2=] 11.Nxg6 hxg6 12.Bg5 [12.Qf3=] 12...Be7 13.Bxf6 Bxf6 [13...gxf6-+] 14.Ne4 0–0 15.g5 Bxg5 16.Qg4 Nf6?! [16...Be3+! 17.Kh1 Nf6-+] 17.Qxg5 Nxe4 [17...Qxd4+ 18.Nf2=] 18.Qxd8 Raxd8 19.Bxe4 Rxd4 20.Bg2 Rfd8 21.c3 Rd2 22.Rab1 Re2 23.Bf3 Re3 [23...Red2=] 24.Rbe1 Rdd3 25.Rxe3 Rxe3 26.Bg2 Rg3? [26...Rd3=] 27.Rf3?! [27.Rd1+-] 27...Rxf3 28.Bxf3 f5
29.Kf2 Kf7 [29...e5 30.Ke3 Kf7 31.b4 e4= with drawing chances if the Black pawns can get on the dark squares.] 30.Ke3 Kf6 31.b4 a6 32.a4 b5? [32...e5 33.Bg2 e4 34.Bf1+=] 33.a5 e5 [33...c5 34.Bb7+-] 34.Bxc6 f4+ 35.Kf3 g5 36.Bb7 Kf5 37.Bxa6 e4+ 38.Kf2 g4 39.hxg4+ Kxg4 40.Bxb5 e3+ 41.Kf1 Kg3 42.a6 f3 43.a7 1–0

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