I've been doing some testing and some calculating based on Dantarion's Master Core files. Shaya's formula appears to be correct, but I have to add a clear note about how the frames are counted. If an attack would hit on frame 4 and do three frames of shieldstun, the frames spent in shieldstun are frames 5, 6, and 7 (that is, frame 4 where direct contact actually happens is just "eaten" by having your shield hit at all). I denote how negative on block all of Pac-Man's various moves are since I projected him to be one of the biggest winners from this; he actually just *barely* misses some extremely powerful thresholds with this patch (as in "if he had one more frame of advantage on a few moves, it would be extremely powerful").



Pac-Man shield advantage/disadvantage (patch 1.1.1):



Jab1: -12 (free to act), -5 (hit with jab2)

Jab2: -14 (free to act), -5 (hit with jab3)

Jab3: -25

Dash Attack: -6 (last hit), -6 (in-between hits)

Ftilt (all angles): -19

Utilt: -20

Dtilt: -16

Fsmash: -23/-24 (depends on spacing, closer/weaker hit will be -24)

Usmash: -23 (first hit is a true blockstring into second hit)

Dsmash: -27



All smashes are assumed uncharged. The minus frames mean that that's the time during which you are stuck in an animation while your opponent is able to do a OoS option (after they expire, you can either have your hitbox actually hitting that very frame for the jab chains/subsequent hits of dash attack or are free to block for the other moves).



What this means meta wise is that if you try to grab Pac-Man with a frame 6 grab while blocking his jab combo you will trade with the next jab in the chain. A grab trading with a hit results in the grabbed character going instantly into a ground break and taking 3% damage. As it turns out, if you do this trade with Pac-Man's jab2, you end up doing 1% more damage than you take (Pac-Man's jab2 only does 2% damage) and end up at minor frame advantage (a small handful of frames, not enough to really exploit). Likewise, characters with frame 6 grabs can grab after any hit of Pac-Man's dash attack (and frame 7 grabs can trade which is favorable with the first two hits).



This kinda leads me to believe that it's likely the story won't change for all that many characters with this additional shieldstun. Most moves are still very minus on block and only safe due to spacing.