when you start countering every move by your opponent and forgeting development of own pieces
You know you're bad at chess when. . .
-Your endgame strategy consists of cleverly sacrificing every piece and praying for a stalemate.
Hey, those prayers came true several times!
You're bad at chess when you post in a thread about bad chess players. Wait. What am I saying? I AM posting in a thread about... Nevermind. Just forget I ever said that.
In the post-mortem, you ask your opponent (who won) why she didn't just push the pawn on the 7th and promote to queen with a backrank. She responds "You can't do that. That's only in checkers."
Saw that happen at my chess club last week. The guy who lost reminded her of the finer points (like how pawns capture diagonally) through the whole game. :)
You know you're bad at chess when:
-You feel accomplished when you learn to perform "The Queen's Tour"
-Your endgame strategy consists of cleverly sacrificing every piece and praying for a stalemate.
-You count on your fingers to figure out whether or not you should take that "hanging" pawn.
-Your FIDE rating is negative.
-You're playing in a blitz tournament and your opponent tells you to take all the time you need.
-You start every game by asking your opponent if they allow mulligans.
-Your chess.com profile has fischer somewhere in it, yet you've never looked at one of his games.
-You know what en passant is, but you give the stinkeye to anyone who uses it.
I'm sure some of these have been around in various forms, but I didn't copy them from anywhere, so resemblance to current chess jokes is unintentional.