Considered not dangerous. Black has a choice between the adventurous 4...Bxf2+, the more sane 4...Nxe5 5.d4 c6 6.Be2 Bd6, and the ultra-solid 4...Qe7 5.Nf3 Qxe4+ 6.Be2 Nd4, which does look like an easy equalizer.
Ruy Lopez 3...Bc5 4.Nxe5!?
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I played this as white in a recent game and when I looked at chessgames.com I found only 3 games with this variation. Is it bad for white or..?