Two horizontal lines starting GOLD-only EA "Turnover - TENRYU -". This is a serialization that looks back at the logic and verification results tried during development, including improvements to take-profit, introduction of roll reversals, trend filters, stop losses, and lot management. It also discloses unsuccessful validations, such as trades that turned red even with a 95% win rate, and records where 24 stop losses were concentrated. Based on development source code and diagnostic data from September 2026, it introduces trial and error from the initial version to the released version. ※The article includes diagnostic results during development. It is published separately from the performance of the current released version.