Grab release

Grab releasing is a technique similar to chain grabbing, except the user releases the victim rather than throwing them. Grab releases are the most abusable in Brawl, and not in Melee or Smash Bros. 64, this is because you could not normally release an opponent in 64, and most character's had one attack that was fast enough to counter it in Melee.

There are 2 types of grab releases. A ground release where the user experiences 30 frames of lag, and the victim also (with an exception of DK, Ness, and Lucas) experience 30 frames of lag and land close-by on the ground. And an air release, where the user experiences 30 frames of lag and the victim (with an exception of Jigglypuff) suffers 50 frames of lag, but usually move a very far distance from the opponent.

Grab release comboes come into existence when a character has either a very short distance air release, two examples being Wario, and Meta Knight, or experiences additional lag from a ground release, two examples being Ness and Lucas.

Exceptions
When ground released, both Ness and Lucas suffer from 40 frames of lag rather than the normal 30. This gives the opponent 10 frames to either regrab either of them, or attack. This also counts Donkey Kong's carry release and doesn't count the Donkey Kong's ground release letting be like the Infinite throw trap.

When ground released, DK suffer's from only 20 frames of lag, rather than the normal 30, so he has 10 extra frames to counterattack the opponent. It's not suggested to grab release DK.

When Bowser or DK grab release an opponent, they only suffer from 20 frames of lag, allowing them to chaingrab or attack out of any grab release.

When Jigglypuff is air released she only suffers from 49 frames of lag, allowing her extra 1 frame to attack out of an air release, this allows her to use rest if the opponent gets close enough but is not essentially very useful.

Wario, who is also known for having grab release issues, experiences the lag of most normal characters. However his air release does not send him any horizontal distance at all, leaving him extremely vulnerable for 20 frames in front of the opponent.

Controversy
Many have argued about whether grab releases should be allowed in competitive play, since they usually much more potent than most chaingrabs, they usually end up as infinites or 0-deaths on the victim.

Well known grab releases are Marth's grab release 0-death on Ness and infinite on Lucas, Dedede's infinites on Luigi, Mario, Samus, DK, and Bowser, and Yoshi's 0-death on Meta-knight and infinite on Wario. (Dedede's chaingrab is partially a grab release, but also uses his downthrow.)

It is unknown why Ness, Lucas, Jigglypuff, DK, and Bowser all have different grab release times than the rest of the cast. Most people believe it was to "nerf" or "buff" them intentionally, but this can never be proven.