I wish to get some analysis for this variation employed by Black in Ruy-Lopez
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15 Nxe4
that's called the Riga variation.
7.Re1 d5 8.Nxd4 Bd6! 9.Nxc6 Bxh2+! 10.Kh1! (10.Kxh2 Qh4+ 11.Kg1 Qxf2+ draws by perpetual check.) Qh4 11.Rxe4+! dxe4 12.Qd8+! Qxd8 13.Nxd8+ Kxd8 14.Kxh2 Be6
EDIT: what you did there, 14...Qxd4 is wrong. Apart that you hanged the black Queen in the end, white is 2 pieces for a rook. I think it's better.
15.Nxe4 is the most easy way to win the game.