12. Bj4
Super-dog Championship (captaintugwash - Martin0)

You had the option Bi5, so it was not that clear whether it was just a free tempo or not. It is true your bishop might get trapped there though. In this case, yes you lost a tempo.
13...Bb6

I'm not spending nearly as much time on this as I should, largely because I know that if I analyse too much, I'll probably just resign! e3 is clearly bad, f3 doesn't look good either, Bg1 is unplayable, so this looks forced...
14. d4

Yeah I'm not letting that pawn advance. Capturing is clearly forced, I'll reassess after your next move.
15. exd3

gg
I don't feel ready to play infinite chess yet.
Showing one potential line to the end:
15.exd3 Qxd3+
16.Qe2 Ng3+
17.fxg3 fxg3+
18.Ke1 Bf2+
19.Kf1 Bd4+
20.Ke1 Bc3+
21.Wd2 Bxd2
(22.Kd1 Rf1+ 23.Qxf1 Qxf1+ 24.Kxd2 Qxa1 and black is ahead a bit more than a queen)
22.Qxd2 Rf1#
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I knew Ng3+ was crushing.
As for infinite, I think it suits my style more. I'm better with an open board, with lots of attacking options. I'm not so good in tight positional games. I think I'll have more of a chance.
When you're ready Martin, I'll be waiting!

This is how far I got in my mental analysis before I decided to resign. I'm glad to see it was as terrible as I suspected.
"Attacking sounds fun"
Yes, but for whom?