you guys liked it sooo

Beneath the board where knights do prance,
Lies a rare and tangy dance.
A gambit few would dare to try,
Yet it schemes beneath the player’s eye.

With pawns exchanged in sacrifice,
I tempt you once, I tempt you twice.
A sour twist, a cunning play,
To seize control and pave my way.

Though seldom seen in match or lore,
I’m a gamble knocking at your door.
I feign retreat, then counterstrike,
A sly maneuver you might not like.

For in my name, there’s more to tell—
A hint of brine, a sharp-tongued spell.
Unorthodox, I leave my sting,
Yet to the bold, I offer a spring.

So think you brave? Will you resist,
This tangy trap you may have missed?
A riddle rare, with plans to trick,
Tell me, who am I, quick, quick, quick?