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B: Mitcham Junction

How did you get there?

SWT to Wimbledon (which I don't think is blocked), then Tramlink

The Orange One wrote:Hint: The Southern network is evil.

Sorry, blocked through West Croydon and Sutton.

So it is. I'll resume the game in the morning - finding it hard to concentrate now.

As it's been quite a long game here's a recap of all the moves so far to avoid any repeats.

A: Mitcham Eastfields, B: Clapham Common, A: Beckenham Junction, B: Vauxhall, A: Denmark Hill, B: Tulse Hill, A: Embankment, B: Lewisham, A: Canada Water, B: Bank/Monument, A: Herne Hill, B: Peckham Rye, A: Stockwell, B: Richmond, A: Crystal Palace

To which I will add:

B: Baker Street

A: Ealing Broadway

I presume you had to reverse at Turnham Green? If you did, it's an illegal move. Rule 4 says:

(4) A "journey" is defined as any route from one station to another exclusively using "connections" as defined in rule 3 and "interchanges" as defined in rule 2(b).

and Turnham Green isn't an interchange (nor is Stamford Brook or Ravenscourt Park). I can't see any other valid route from Crystal Palace to Ealing Broadway.

You are correct! In that case, Barons Court.

Yes, I wasn't too sure about that myself, particularly as I made some remarks to tubeguru near the start of the thread that suggested otherwise. I think it should be a general principle that you can only make changes at recognized interchanges but the rules need clarifying again.

B: Kensington (Olympia)

A: Liverpool Street

B: Clapham High Street/Clapham North

A: Forest Hill

Sorry, but I cannot remotely see how you got there. London Bridge is blocked so you can't have got there by Southern, and all stations from Whitechapel to Surrey Quays are blocked so you can't have got there by the Overground. (Unless you somehow approached it from the south, but that appears impossible.)

Liverpool Street - Stratford - Lewisham - Elmers End - East Croydon - Forest Hill.

Central line crosses the Overground (otherwise you had me well and truly trapped!). Tramlink is only useful as an intermediate move.