Kostic's Trap

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  ...

What happens if the Knight takes the Rook at h8?  If 6. Nxh8 then Qxh1+, 7. Bf1 Qxe4+, 8. Be2 Nxc2+, 9. Kf1 Qh1 mate.

6. ...  Qxe4+
7. Be2, Nf3 mate

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