What Does He Not See?

Inspired by the cautionary (for Black) ending of Mannixcannon - Ellema, FICS, 2014 posted a few days ago  (see "Q.E.D.") I wanted to present another recent example of the "lesson" for the defender - do something with the extra piece(s) that White freely gives you.

According to The Database, Karranca, of FICS, started playing the Jerome Gambit (and related lines) last year.

Welcome to the Jerome Gambit Gemeinde!

Here is how one of his games ended. (It almost looks like Black's extra Bishop has not moved since its initial trip to c5; but it has, it later returned.) It is clear what his opponent did not see until it was too late. Short on time? Stressed out? Overconfident (a piece is a piece)?

Karranca - Keracim, blitz, FICS, 2014
after 47...Kxc4 Drawn

Here is a short, complete game by Karranca, showing that he understands that White must do something with the opportunities given to him, too.

Karranca - bevalenzuela
blitz, FICS, 2014

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ 

4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ng6 7.Qxc5 d6 8.Qc3 Nf6

9.d3 Re8 10.O-O c6 11.Re1 Ne5 12.Nd2 Qc7 13.d4 Neg4 14.Qg3 Nxe4

A tactical oversight. Jerome Gambiteers do not always get this chance. White sees that. 

15.Nxe4 Rxe4 16.Qf3+ Kg8 17.Rxe4 d5 18.Re8 checkmate.