1. d4 d5 2. c4 dxc4 3. Nc3 Nf6 4. Qa4+ Nc6 5. Qxc4 Nxd4 6. Bf4?? Nc2#

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Source(s): Leinster Chess News, vol. 2, no. 4, January 1999 (via the Wayback Machine).