Halosar Trap

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This article uses algebraic notation to describe chess moves.

The Halosar Trap is a chess opening trap in the Blackmar-Diemer Gambit.

The trap begins with the moves

1. d4 d5

2. e4

This is the start of the Blackmar-Diemer Gambit.

2. ... dxe4

3. Nc3 Nf6

4. f3 exf3

Now 5.Nxf3 is usual, but by capturing with the queen, White lays a trap. (This is the Ryder Gambit.)

5. Qxf3 Qxd4

6. Be3 Qb4?!

Better is 6...Qg4. Black thinks that castling is prevented because of ...Bg4, but White castles anyway.

7. 0-0-0 Bg4?

(See diagram.) Blundering into the trap.

8. Nb5!!

White threatens mate with 9.Nxc7#. The Black queen can't capture the knight because 8...Qxb5 9.Bxb5+ is check.

8. ... Na6

9. Qxb7 Qe4

Black lost even more quickly in Diemer-Halosar, Baden-Baden 1934, after 9...Rc8 10.Qxa6 1-0.

10. Qxa6 Qxe3+

Worse is 10...Bxd1 11.Kxd1 Rd8+ 12.Bd2 and White is winning, for example 12...Ng4 13.Nxc7+ Kd7 14.Qxa7.

11. Kb1 Qc5

12. Nf3

The White threat of 13.Qb7 wins the black a-pawn by force. With even material and a passed a-pawn, White will have a winning advantage (Burgess). Even stronger seems 12. Qb7! with the idea 12. ... Bxd1 13. Qxa8+ Kd7 14. Nc3 and White has a winning attack.

[edit] References

• Burgess, Graham (2000). The Mammoth Book of Chess. Carroll & Graf. ISBN 0-7867-0725-9.