Keeping an eye on other runners (but which ones?)

[spock]

Thanks to Peter and JImibt for very informative and helpful replies. Respect.

[Korattt]

that's potentially why you need to black box those runners into a sub-book (i.e. the main actors coerced into a virtual 100% book). from that, you can then treat them as inter-related pistons...

I like to see the front of the market as repelling magnets but a do see Jim’s way of thinking