dammmm
What would you say if you lost a match ?

Heres what I said last Wednesday:
"Well played. I really thought that looked like a draw."
The annoying thing is, it WAS a draw. If I had just played one move a couple of moves earlier, noticing the pin on my pawn, it would have been perfectly drawn. DARN YOU TIME PRESSURE!!!

I knock all the chess pieces down and scream about the russians trying to mess with my head. I usually steal a queen or a king so that they cant have other games played.

When you lose a game, you should act like a complete professional
...accuse your opponent of cheating and storm out.

Depends on how angry I get, but stabbing him is allways an option.
On a more serious note, if we are talking online, I usually give them a goodgame, if I lost due to me just screwing myself over, I usually just leave the game without any comment.
win or lose, I always say good game. Usually, I try to either review the game or play a rematch with my opponent. After a "best of 3" with my opponent, I may end it or continue, depending on whether I have time or not.

i will always tell my opponent "good game", and then move on to analyze my own game.. if they were good at any piece, i would give them the knight virtuoso, comisinoer (forgot the spelling) of the queen or those similar ones (if the game was here on chess.com)
and if i won, i would still say "good game", and i would add, "better luck next time"

If I win: ty4playing.
If I lose: ty4playing.
No, in all seriousness, when I win I normally say something like "Thanks for the game," and when I lose it's often along the lines of "Thanks for the lesson" or "Well done." "Good game" is also common, if it is a good game.
By the way, that's a great picture with the original post.
Over the board: Attempt a handshake,and say: nice job!
Online? If the player was chatting a bit,I'd say: Well done! If there was no dialogue, I'd keep it that way, win or lose...

Some play because they like win. Others play because they like play.
I like to feel the pleasure of my opponent when he wins.

I always say "well played" no matter how bitter I may feel,if I have chatted with my opponent I may use a less generic response suiting the game and player, and if in tournaments I usually wish them good luck with remaining games.
There is no need to be rude because I lose, I lose because I played badly or I played someone better, there are no other reasons for loss.
Thats the truth, it is just a game after all.
"What would you say if you lost a match ?"
I'd congratulate my openent : << good game >> / << you are a good player >>
and I would say too : << damn >> / << what a pity >> ((because i lost that match))
and you? what would you say? the truth ...
thanks