tubechallenge.com

No takers yet for the next regular Where Am I, so I'd like to try something a bit different. Not sure how it'll work out!

I'm at a station on the Tube map - just the eleven lines of the London Underground, nothing else. Your job, as usual, is to find out where I am by asking a series of yes/no questions. However, after I've answered each question I shall make a journey of one stop, in any direction. The next question will then normally relate to my new location, although you can ask questions like "Were you on the Northern Line when you answered question 3?" if you like. (I'll keep a record of the whole journey.)

I am allowed to reverse direction, but if I have previously made a journey from station A to station B, I won't make it again. (This prevents me from going round in circles.) If it becomes impossible for me to move, then I'll say so and your job will be to find me at my permanent location.

As usual, there's a maximum of two questions in a row. If you ask a question before I've answered the last one, I'll answer it as though it had been asked after my answer to the last one (i.e. after I've moved a second time).

Not sure how long this will take so I'll keep it open-ended. Fire away!

Are you in zone 1?

Yes. (1)

Are you on, or north of the Central line?

No. (2)

Are you on the District Line?

No. (3)

Are you on, or south of the District Line?

Yes. (4)

Is it possible for your next move to place you at a station served by the Victoria Line?

I'm not sure if it is possible to win this game (unless you end up on a dead-end branch). As soon as we work out where you were, you will have already moved somewhere else.

He could take a variety of paths, yes, but we can work things out by narrowing it down. I've narrowed down his possible starting stations to 28.

Urzzz1871's question is really, really confusing though.

Just trying to narrow down where he is.

A "yes" would mean he is either on or 1 station away from the victoria line cutting down his available stations to 10, as opposed to about 40/50 possibilities at the moment.

Urzzz1871 wrote:Just trying to narrow down where he is.

A "yes" would mean he is either on or 1 station away from the victoria line cutting down his available stations to 10, as opposed to about 40/50 possibilities at the moment.

It's not whether the question is helpful, it's just that it's really confusing. Because we don't have any clue where he is at the moment (he moves AFTER he answers the question), this would put the things we currently know as actually up to 2 stations away from the Victoria Line.

I'm also assuming that he's following Guinness same-station rules (no Bank/Monument or Paddington interchanges, although he wouldn't have possibly had a chance at using the Paddington interchange yet) because if not there's a lot more options I have.

Is that not still a significant improvement from where we are now?