[Technical Report] Designing for "Survival" rather than "Profit": the culmination of extreme fund management and process design

■ Introduction: The Optimized “Phantom Holy Grail” and the Harsh Reality of the Market

At dawn, what appears on the cold, impersonal monitor are countless backtest results that have been running since late night. By tweaking parameters and applying overfitting to past historical data, it is not difficult to draw a beautifully upward asset curve.

Many system developers become intoxicated by this “phantom holy grail” created in a clean room and push the product into real operation as is. However, the uncertain real market is merciless. When faced with unknown fluctuations, extreme volatility, or liquidity dry-ups, the beautiful curve based only on past data collapses in an instant, and accounts are driven to bankruptcy. This is why there are innumerable “corpses of algorithms” lying around in the realm of system trading.

We at Semura Lab have, through long-term verification and repeated scrapping and rebuilding of systems, arrived at one truth. Systems that chase “maximizing profit” as their primary goal are extremely fragile to changes in the environment. What engineers of process design should truly construct is an absolute defensive line, capable of surviving any abnormal market condition by ensuring they never exit the market (never go extinct) — a cold, unwavering defense.

■ 1. Uncertainty that leads to ruin and the “extreme rules” embedded in the system

Whether discretionary trading or system trading, the greatest trigger for capital blowout is the lack of measures against “unforeseen consecutive losses (drawdown).” The operation of irrational logic to recover losses, or averaging down in abnormal markets, will certainly destroy the account.

As process design engineers, we never leave such uncertainty to theory or luck. To physically block it, we directly embed in the core logic extremely strict “capital management absolute rules” that institutions and prop firms adopt.

① Strict setting of maximum daily drawdown

Markets can experience sudden flash crashes and abnormal trends that occur only on certain days (local noise). Our lab’s system, once the loss in a single trading day reaches a pre-set line of “definitely recoverable percentage,” will physically block all entries for the rest of that day no matter what trading signals appear thereafter. This is the process by which the system immediately determines that “today’s market environment is not aligned with the current logic.” By eliminating the risk of a certain abnormal market causing fatal damage at the code level.

② Definition of “complete withdrawal” via an absolute drawdown limit

Not only daily protection but a process to manage the life span of the entire system is essential. Set the maximum tolerable drawdown relative to initial capital (e.g., 10% loss), and when touched, forcibly shut down all system operations. Market volatility and cycles (regimes) change over years. Reaching this final line does not simply mean a deep stop-out. It means that the current logic’s edge has completely diverged from market conditions and reached its shelf life, and the system autonomously declares withdrawal from the battlefield as a final defense line.