The cube: stays on a place and only lets alley pieces go through. moves like a rook that can only move 1 square it a time. Can't capture.
the rooks
are the cubes.
Invent the new worst/most useless chess piece ever!
Sort:
the rat wall. You can only pass over it once your opponent flags.
The white and black knights are the rat wall.
the dancing knight. it will only take your own pieces and wont help checkmate the opponent.
and
poof. It also turns into a regular black knight every black move. if you are playing white that is.
Aug 9, 2017
0
#525
the error rook: moves like a rook but captures like a bishop.
The queens are the error rooks.
My entry for the worst piece is the peon. It moves like the pawn except that it can't capture or check. And when it reaches the 8th rank, it can't be promoted; it just sits there for the rest of the game.
wertq: moves like a king but cannot capture and starts in replacement of q . if they mate it you lose.
The Parteo. It adds 1 min to your opponents clock every move and takes up the space of the Q. It moves up 2 spaces each move, eating anything in the way. It looks like a pawn and can't capture like one. When it gets to the end of the board it promotes into a queen for your opponent. If it captures your king on its way to the end you lose. So you cannot mate with only a Parteo, but you can lose if your opponent is smart enough to not capture the Parteo and let it Promote to their queen! 
And the White Parteo is colored this blue, the black Parteo is colored this green.
Aug 12, 2017
0
#534
The comedian. Ridiculizes the opponent's King so the entire army will turn against him.
The reversing pawn---instead of promoting, the pawns reverse their movement direction so after reaching e8 a next pawn move could be e7 or exd7 for example
Aug 12, 2017
0
#536
The spy- whenever it moves you lose in the board burns down your house
Nuclear pawn: If anything comes around it, the whole board will blow up and end the game!
This is still active?
Aug 16, 2017
0
#540
the chicken with chicken pox: gives your opponent's pieces chicken pox(not including your opponent.)
the bingo card: takes up a 3x3 area. When you get 9 of your pieces on it it explodes and the you win (?!?).
the cup of coffee: you knock it and spill it and it makes your pieces ahead 1-2 squares.
the prawn: only eats pawns
the nonsense: When a enemy piece tells it to attack your side, it gets captures. (but it is yourmove after that)
the chinese: starts at b3 or g3 and moves and captures forward. when it goes to the 5 to 8 rank moves like a king.
the pro pawn: never capture and never gets captures.
the last sentence of this post: explodes after your opponent starts singing.
The Chunk: lets only the enemy pieces pass through and over and around it