Originally Posted by
RichardInSF
You didn't mention my favorite: buy a "Tokunai free" ticket for Y730 that allows unlimited use of JR in and around the central Tokyo area. Use it to go in and show it when you exit at, say, Odawara, paying the difference in fare but keeping the ticket.
Then to return from Odawara, buy a minimum price ticket and use the Tokunai Free to exit in Tokyo.
I'm sure this is not allowed, but the system isn't sophisticated enough to check -- and even if it does, your Tokunai free shows an entry with no exit because when exiting at (say) Odawara, the ticket agent never gets his mitts on the ticket to indicate an exit.
Right, this is the
kiseru move. Say your commuter pass is to go between Yokohama and Kawasaki. Use your pass to get in at Yokohama, and use the kaisuuken to get out somewhere in the Yamanote. On the way back, use the kaisuuken to enter the Yamanote and use your pass to get out at Yokohama. Clearly theft of service, but we're not discussing the legality/morality of this, just looking for the arbitrage.