OK. I'm working on a different one.

As dfhwze has written above, this a nearly similar kata. The other ones are already have to much satisfaction rate to change.

Just how chess can be played with just bishops and rooks, the solar system can be contracting.

Fixed it.

Now "Earth" (and "Venus") will leave the orbit.

Now the return should be "No planet won!" for either empty list in input or empty list after game (for good code that would be the same). It still expects "It is a tie!" if there are planets in the solar syste, but it's a tie.

Fixed it!

Added example with Saturn because Neptune is already part of the other example, and anyway, Neptune doesn't have four moons.

It's like saying that . is used for full-stops and shouldn't be used for dot balls in this kata. So just think I'm re-inventing the > symbol.

A little similar to Difference of 2.

Added input assertion messages on failure.

Thank you!

As the input is a string, it won't modify the input, that only happens with lists.