I Couldn't Prompt GPT-OSS-20B to Control Its CoT

I wrote a while ago about how it was easy to get Claude or Gemini to control their CoT , but other research found that models only follow CoT formatting instructions ~2% of the time . The prompts other people were trying didn't match what I'd expect to work (just be extremely detailed and repetitive), so hubris led me to try to find some prompts that would control CoT in GPT-OSS-20B .