- Halosar Trap
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Black falls into the trap with 7...Bg4?The Halosar Trap is achess opening trap in theBlackmar-Diemer Gambit .The trap begins with the moves:1. d4 d5:2. e4This is the start of the Blackmar-Diemer Gambit.:2. ... dxe4:3. Nc3 Nf6:4. f3 exf3Now 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!!Chess diagram|=
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After 11. ... Qc5White threatens mate with 9.Nxc7#. The Black queen can't capture the knight because 8...Qxb5 9.Bxb5+ is check.:8. ... Na6:9. Qxb7 Qe4Black 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. Nf3The 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.References
*cite book | author=Burgess, Graham | title=The Mammoth Book of Chess | publisher=Carroll & Graf | year=2000 | id=ISBN 0-7867-0725-9
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