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What does -x On Shield mean?

SereneMOS

Smash Rookie
Joined
Jan 6, 2020
Messages
3
I've been on ultimate frame data a lot recently, but I noticed that one of the values for moves given is something like, -4 On Shield. I don't know what it means and I wanted to see if someone else did.
 

Nah

Smash Champion
Joined
May 31, 2015
Messages
2,167
It's basically an indicator of how safe the move is on shield, the more negative the number, the more unsafe it is. "Frame advantage" is the technical term I think.

If a move is -10 on shield, it means that the shielder can act 10 frames before the attacker can. A move listed as +10 on shield means that the attacker can act 10 frames sooner than the shielder. I don't know how exactly the math works, but it's largely a result of move damage, endlag/landing lag, and shield drop frames

It's a smidge more complicated than that though, as you also need to account for the move's range, the opponent's OoS options, and human reaction time in order to get a better sense of shield safety
 
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