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13...a5?! What was this move for..........? Perhaps it even deserved a "?".
15...Bxf5 and the attack has to wait. White is better though.....
17...Kg8? Hmmm, i would definitely played 17...Kh8 and i think there is a game after this. White would be better but he would not be winning.
After 17...Kg8 game is over..............
After 17...Kh8 if:
18.Rxe6 fxe6 19.Ng5 Qd7 20.Qf3 Bd8 21.Bg6 e5 22.Nf7 Kg8 with a small advantage for white......
18.Qc1 Ng8! and white has to find a way to attack.......(19.Qf4 Nd5 and then Ndf6 and black would have many defenders....(for example 20.Qe4 Ndf6 21.Qh4 Ng4 22.Bg5+ 23.Rxe6 fxe6 24.Qe4 Nf5 25.Qxe6 Rf8! with unclear game))
18.Qd2 Ng8 (or even Nh5) and white is not much better but just has a chance for an attack........
After 19.Qf4 we have the same position with 18.Qc1.