17... Q(9,18)
Chess on an Infinite Plane (PixelByPixel - captaintugwash)

Looks like I'll be offline from this evening until Tuesday evening. I'm getting a dongle, however there's no guarantee I'll get a signal out where I'll be. I should do, I'm not far from where I've lived in the past and I coped with a dongle then.
I might be offline for a good week, please give me until the end of next weekend to get myself sorted, thanks.
Glad you asked about the (-1,8) rook vs the (10,9) rook. I should have noticed and waited for clarification before posting a board. Glad no problems.
16.C(-4,17)-(5,17)+...R(-1,9)-(5,9)
17.C(5,17)-(6,15)