New piece concept: Mutator

the Mutator is a piece that can capture it's own pieces. In doing so, it gains the ability of that piece. You could have your mutator capture your rook and bishop to create a mutated queen. If you capture your own piece twice however, like taking two of your own rooks, you get the ability of one rook. Nothing else. You can't capture kings, however, and capturing pawns doesn't give you the ability to take en passant. The movement would be the same as a regular king at the start, and it would gain more abilities as it captures more.

-1 what if you took your R and your Q?

it would be only a mutated Q

cool!!

Then don't do it!

although all you really so is basically add a extra queen maybe add fairy pieces so the mutator has some tough options to pick from you could add the archbishop maybe the chancellor/elephant and maybe other fairy pieces you could add the mutator to gothic chess too!

although all you really DO instead of SO. Typo.

then that would be a bad idea xD

You're right

Take a look at Fusion Chess and similar variants:

https://www.chessvariants.com/other.dir/fusion.html 

Similar Variants

Although I came up with the idea behind Fusion Chess on my own, I was not the first to come up with this idea. Pritchard's Encyclopedia of Chess Variants describes some similar games. I was unaware of these games when I created Fusion Chess, and I did not think of these games or borrow any rules from them when I revised it. For the sake of historical interest, here are the games presented together.

Combination Chess (1898)

This game was a century old when I invented Fusion Chess, and Pritchard does not name the inventor. In this game, the Queen moves as a King but isn't royal. As in Fusion Chess, fusion is permissable between any of the pieces except the King and Pawn and with the restriction that no more than three pieces may combine together. This restriction is probably because a Rook/Bishop/Knight compound would move no differently than a Rook/Bishop/Knight/Queen compound. As in Fusion Chess, compound pieces may undergo fission by moving a component to an empty space, though unlike Fusion Chess, a fission move cannot be used to check the King. Castling is not allowed when a Rook is part of a compound piece, probably on the grounds that it is no longer a Rook. Nothing is said about whether castling is once again legal if the other components move away from the Rook.

Coronation Chess (1924)

Invented by Frank Maus. Coronation is the same thing as fusion, and in this game, it is allowed between a Rook and a Bishop after the player has lost his Queen, or more generally whenever the player lacks a Queen. There is no mention of fission in this game.

Union Chess (1924)

Invented by Frank Maus. In this game, coronation is allowed between any pair of Rook, Bishop, or Knight, the only restriction being that the two pieces are different. There is no mention of fission, and no mention of allowing triple compounds like the Amazon. It is not stated whether Pawns may promote to the other compound pieces.

Confederate Chess (1924)

Invented by Frank Maus. This is like Union Chess with fission, which is described as abdicating a coronation. Perhaps the name for this game came to mind because the Confederacy wanted to secede from the Union. There is no mention of any restriction on fission. So, maybe fission can be used to capture a piece.

Empire Chess (1925)

Invented by Frank Maus. This is like Coronation Chess with the additional options of combining Rook and Knight into an Empress or Bishop and Knight into a Princess. As in Cornonation Chess, coronation is allowed only after the Queen is lost, or more generally, when a player does not have another compound piece on the board. But a player may gain additional compound pieces through Pawn promotion. A Pawn may promote to an Empress or Princess, though a player may never have two compound pieces of the same type on the board at the same time.

i take my vote back, +1

but it might be a bit hard to code so we have o be patient

Yes

If it captures a pawn then could it promote?

@acgusta2 Nah, that would be broken xD. It would only take the mutation capabilities.

That's unfair! Suppose you take a pawn with the Mutator and then take a bishop. Can the mutated bishop promote to a queen?