Literally this thread
Another person: I think this is the worst
OP:
NOONONONONOOOO STOP IT DAMAINO IS THE WORST!!!!! Damaino is literally losing by first bro STOP ITDAMAINO IS WORST!!% WAUHDCUIAOHFSOIASJFIOAJSDOIWD I KNOW THE OPENING YOU NAMED IS -300 FOR BLACK BUT DAMAINO WORST!!!!
In fact, Mikhail Chigorin played the damaino several times and there is even a line named after him (Damaino Defense, Damaino Gambit, Chigorin Gambit)


What is the worst opening that either side can play in chess? This is just for fun purposes.
In my opinion, it is the Damiano Defense, as it is proven to be losing by force as black.
how's damiano defense losing by force?
It would be losing via 3. Nxe5 Qe7 4. Nf3 Qxe4+ 5. Be2, where although White is not up any material, the advantage is still +1.98, at least according to Stockfish.
i meant losing by force and not positionally worse. the irish gambit is worse because you are simply giving up a knight without enough compensation
Well, if 3. Nxe5 fxe5, Qh5+ is winning by force for White. If g6, then Qxe5+ wins the rook and if instead Black plays Ke7, 5. Qxe5+ Nd7 6. Bc4+, Black either gets checkmated or loses back the material with interest.
By the way, 2. f6 is mistake in Damiano defense.