1.d4,d5 2.e4,dxe4 3.f3 Blackmar Gambit, published 1882, black is better after 3..,e5

1.d4,d5 2.e4,dxe4 3.Nc3, followed by f3 later, was promoted by Emil Diemer (1908-1990), now known as BDG or Blackmar-Diemer Gambit

Black can still play ..,e5

• 3..,e5 MBourque
• or one move later: 1.d4,d5 2.e4,dxe4 3.Nc3,Nf6 4.f3,e5 Bihlmeyer

Main variation

• - 5..,e6 set-up Ruth, Castañeda, Wantroba, Qiao
• - 5..,c6 "Caro Kann" set-up Faille Fiske
• - 5..,g6 Diemer 1950
• - 5..,Bf5 Mansigian
• - 5..,Bg4 Kodali 2015, Kodali 2016, Kodali 2017, Roy

Alternative against 5..,Bg4 players: sac another pawn

• a trap: Kodali 2022, Diemer 1934
• other examples: Diemer 1949, Diemer 1949, Diemer 1949, Diemer 1948

Black does not take on f3 and defends the extra pawn with ..,Bf5

• 1.d4,d5 2.e4,dxe4 3.Nc3,Bf5 (instead of defending the pawn with 3..,Nf6) Hartmayer

Black does not take on f3 and defends the extra pawn with both ..,Nf6 and ..,Bf5

• 1.d4,d5 2.e4,dxe4 3.Nc3,Nf6 4.f3,Bf5 (defending the pawn with both 3..,Nf6 and 4..,Bf5) Harris, MBourque

Decline

• Caro Kann Prawira, Colwell, Lazarus
• 4..,e3 instead of 4..,exf3 Bihlmeyer
• 4..,c5 instead of 4..,exf3 Meredith

When they do not play 1..,d5

• Different move order after 1.d4,Nf6 2.Nc3,d5 3.e4
  • 3..,dxe4 is a standard BDG
  • 3..,Nxe4 exchanges pair of knights first:
    • Bauer accepts the pawn sac,
    • Bihlmeyer declines.

Games