9. Qx(-2, 15)
Chess on an Infinite Plane (abstractcube - vickalan)

I need to call for vacation. You can still reply here, but I'm travelling and won't be back till around July 29. (I plan to still mod during travel - I just won't have time to calculate moves).

I'm in three infinite chess games. I knew Tug was good, but I wasn't expecting this level of play from you, and also samuelysfung.
In the beginning it's not too different from vanilla chess. I think your experience will start to show as the game goes on, but we'll see.
13. Q(0, 15)
For both of our sakes, I'm going to start putting the board code in this details box. (you can click to open it)
Board Code
v0;0,-2,1;2,-1,1;16,0,1;14,1,1;4,3,3;6,6,4;8,0,15;10,5,1;6,6,1;4,7,1;14,8,1;16,9,1;2,10,1;0,11,1;0,-4,-6;0,-3,-5;0,-2,-4;0,-1,-5;0,0,-6;12,1,0;0,9,-6;0,10,-5;0,11,-4;0,12,-5;0,13,-6;12,11,-6;0,-1,2;0,0,2;0,1,2;0,2,2;0,4,4;0,5,3;0,6,2;0,7,2;0,8,2;0,9,2;0,10,2;1,-2,8;3,-1,8;17,2,9;15,1,8;5,2,8;7,1,6;9,4,19;11,5,8;7,6,8;5,6,6;15,8,8;17,9,8;3,10,8;1,11,8;1,-3,14;1,-2,13;1,-1,14;1,9,15;1,10,14;1,11,13;1,12,14;1,13,15;13,5,9;1,-1,7;1,0,7;1,1,7;1,2,5;1,3,6;1,3,4;1,5,6;1,6,7;1,7,7;1,8,7;1,9,7;1,10,7;

Sorry for my long delay. It's a fun game and I'll try to play more consistently. You, Sam and Tug are all tying me in knots, all at the same time.

I'm pretty sure you just blundered a queen. So now we've each blundered one key piece. Now the game is still on. (This will be really embarrassing if I missed something though).
Oh... whoops. That's not good.
14. H(8, -3)
Board code
v0;0,-2,1;2,-1,1;16,0,1;14,1,1;4,3,3;6,6,4;10,5,1;6,6,1;4,7,1;14,8,1;16,9,1;2,10,1;0,11,1;0,-4,-6;0,-3,-5;0,-2,-4;0,-1,-5;0,0,-6;12,1,0;0,9,-6;0,10,-5;0,11,-4;0,12,-5;0,13,-6;12,8,-3;0,-1,2;0,0,2;0,1,2;0,2,2;0,4,4;0,5,3;0,6,2;0,7,2;0,8,2;0,9,2;0,10,2;1,-2,8;3,-1,8;17,2,9;15,1,8;5,2,8;7,1,6;9,0,15;11,5,8;7,6,8;5,6,6;15,8,8;17,9,8;3,10,8;1,11,8;1,-3,14;1,-2,13;1,-1,14;1,9,15;1,10,14;1,11,13;1,12,14;1,13,15;13,5,9;1,-1,7;1,0,7;1,1,7;1,2,5;1,3,6;1,3,4;1,5,6;1,6,7;1,7,7;1,8,7;1,9,7;1,10,7;
15. Nx(4, 5)
Board code
v0;0,-2,1;2,-1,1;16,0,1;14,1,1;4,4,5;6,6,4;10,5,1;6,6,1;4,7,1;14,8,1;16,9,1;2,10,1;0,11,1;0,-4,-6;0,-3,-5;0,-2,-4;0,-1,-5;0,0,-6;12,1,0;0,9,-6;0,10,-5;0,11,-4;0,12,-5;0,13,-6;12,8,-3;0,-1,2;0,0,2;0,1,2;0,2,2;0,4,4;0,5,3;0,6,2;0,7,2;0,8,2;0,9,2;0,10,2;1,-2,8;3,-1,8;17,2,9;15,1,8;5,2,8;7,1,6;9,0,15;11,5,8;7,6,8;15,8,8;17,9,8;3,10,8;1,11,8;1,-3,14;1,-2,13;1,-1,14;1,9,15;1,10,14;1,11,13;1,12,14;1,13,15;13,5,9;1,-1,7;1,0,7;1,1,7;1,2,5;1,3,6;1,3,4;1,5,6;1,6,7;1,7,7;1,8,7;1,9,7;1,10,7;
Big blunder by me.
I missed that fork. I'll have to play expertly to make up for this.
8...H(5,9)