On the 9th day of the last dance with 20u, I went from a floating profit of 200u to a loss of 500u. I made a few mistakes that I hope to avoid in the future. First, after breaking the previous high, I didn't take profits in stages. Second, after going into the red, I missed multiple opportunities to reduce my position. Third, my market analysis was off, which led to a Martingale strategy that magnified my losses.