This trap was named after Serbian Grandmaster Borislav Kostic, who played it in the 20th century. It is also known as the Blackburne Shilling Gambit.
1. e4, e5
2. Nf3, Nc6
3. Bc4, Nd4
Black intentionally leaves the e5 pawn as bait. White takes the pawn on what looks like a strong attack on f7.
4. Nxe5, Qg5
5. Nxf7 ....
The Bishop may take the pawn instead (5. Bxf7 ....) but Black simply moves the King away (5.....Kd8).
5. .... Qxg2
6. Rf1, Qxe4+
7. Be2, Nf3 mate
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