Chess on an Infinite Plane (hitthepin - aidanB1)
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To make it a little easier to identify squares, I added orange brackets at the corners of the "classical" section of the 8x8 board. These are squares (1,1), (1,8), (8,1), and (8,8). On move 6 now:
5.B(8,-4)...B(6,5)
6.(8,3)
6.(8,3)...N(6,6)
7.G(8,2)...(5,6)
8.N(3,3)...C(8,6)
9.R(10,0)...R(-1,11)
4. B(6,5)