I followed my own advice by pulling us off the beaten track early and deep into the woods against a better opponent.
Still, it seemed to me that I didn't grab a clear advantage until 14.P13, which seemed too far to the right. I was expecting something like 14.N13. After that, Klaus found a clever move by forcing 17.j19 and then creating a double threat with 18.L14, which makes the J18 k17 sequence work for him. At first, it seemed like the obvious answer was 19.L15. But then, for example, 20.m1221.i1322.k1123.j1024.j825.l926.n8! I didn't see any way around that, so I took a step back and looked at this position as a typical Y-shaped double threat. I looked for a spot high in the branches of the Y, and although there wasn't much space up there, it looked like 19.f14 might actually work. I don't see a way for Klaus to win after that.
Still, it seemed to me that I didn't grab a clear advantage until 14.P13, which seemed too far to the right. I was expecting something like 14.N13. After that, Klaus found a clever move by forcing 17.j19 and then creating a double threat with 18.L14, which makes the J18 k17 sequence work for him. At first, it seemed like the obvious answer was 19.L15. But then, for example, 20.m12 21.i13 22.k11 23.j10 24.j8 25.l9 26.n8! I didn't see any way around that, so I took a step back and looked at this position as a typical Y-shaped double threat. I looked for a spot high in the branches of the Y, and although there wasn't much space up there, it looked like 19.f14 might actually work. I don't see a way for Klaus to win after that.