A blow to the Ziegler

The Ziegler defense ( 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c6 6.Bc4 Bf5 has always posed a problem to the attacker as the traditional lines 7.0-0 e6 8.Ne5 is insufficient.

However, 7.Bg5 e6 8.Nh4 Bg6 9.Nxg6 hxg6 10.Qd3 (diagram) gives white decent chances.

Blitz play this morning continued 10...Be7 11.0-0-0 and now the new move 11...Ng4 (diagram)

Black wants to exchange some pieces and eyes the f2 square for his jumper - what can you expect more from a move ?

Play went 12.Bxe7 Qxe7 and now I threw in the standard sacrifice 12.Bxe6 (diagram)

Obvioulsy, I was hoping for 13...fxe6 14.Qxg6+ (++), but that would have been too easy.

My blitz opponent played 13...Qg5+ 14.Kb1 fxe6 and now 15.Qg3 (diagram)

Here I thought that white had the advantage, as I have two interesting attacking options
- the knight is pinned and can ve attacjed by means of the simple h3
- my knight can attack the queen with Ne4 and the check on d6.

But it seems that it is actually black who is on top. My trusted silicon assistant gives 15...Qh4 16.Qc7 0-0 17.Qxb7 Nf2 18.Qxa8 Nxh1 19.Qxa7, with black having the piece for two pawns.

Have we discovered the real refutation of white's alternative line in the Ziegler( or O'Kelly ) defense ? It surely looks so....