My mistake was 27.o13.

for example:

|27.q12 28.p8 29.n9 30.n7 31.g8 32.p10 33.e18 34.e20 35.e22 36.d18 37.f20 38.h16 39.d16 40.g14 41.d11,
|27.q12 28.p8 29.o11 30.n9 31.m10

I could have tried |47.m11:
|47.m11 48.h12 49.s10 50.q7 51.q9 52.o8 53.o10 or
|47.m11 48.l11 49.k10 50.j10 51.i9 52.h9 53.s10 or
|47.m11 48.n10 49.h13 50.i11 51.l13 52.j12 53.k11 54.k14 55.i12 or

but

|47.m11 48.h12 49.s10 50.q7 51.q9 52.m7

Thanks for the analysis! I admit I didn't see |47.m11 at all. :/

What about something like this?
|31.m12 32.o14 33.d16 34.g14 35.d11 36.e9 37.f12 38.g10 39.j14

I thought that you would have played something like this:
|31.m12 32.o14 33.d16 34.g14 35.d11 36.f12 37.e13 38.e9 39.d10 40.g8

Isn't that also possible in the line we actually played? Did I overlook something that simple?

Once you moved 44.e9 I believe spd_iv took 45.f12 to prevent you from the line he described. Another version could have been more complicated with the same outcome:

44.d13 45.e14 46.f12 47.c13 48.e9 49.d10 50.g8

What happens with 27.q12 28.p8 29.q10?

Sam Dakota speaks!!! I was unsure if you even knew English. You never say a word in your games.