This game is played the moves of the Halosar Trap of the Blackmar-Diemer Gambit. Queen's pawn opening.
1... d5 2. e4
Blackmar-Diemer Gambit
2... dxe4 3. Nb1c3 Ng8f6 4. f3 exf3 5. Qd1xf3
The Ryder gambit. Offers the d-pawn for even more advantage in speed at the cost of more material.
5... Qd8xd4 6. Bc1e3 Qd4b4
?! Takes the queen from danger and threatens the b2 pawn, confident that white can't castle because of the threat Bg4 which would win a quality by taking the rook at d1.
7. O-O-O
Castles anyway, protecting the pawn, developing the rook, and sets the trap.
7... Bc8g4
? So tempting, but leads to defeat.
8. Nc3b5
!! Triggers the trap. Some moves could avoid the immediate checkmate.. Na6, Nd7 (either one), e6, but none of those are without problems or cost.