What Happens When You Deploy a Long-Only Bot on Gold’s Worst Day in Months
A post-mortem of two gold trading bots on August 13, 2026 — and what we learned about signal generation, position sizing, and why “safe-haven” strategies can still lose money.
The Setup
On August 13, 2026, gold fell roughly 80 points in a clean, one-directional selloff. From an open near 4,400 down to an intraday low around 4,319, it was the kind of day that trend followers dream about — and that long-only bots learn to fear.
That day, we had two gold bots running simultaneously. By the end of it, one had traded 69 times and lost $20,670. The other saw nothing — not because the market was quiet, but because a bug in its code threw away 99.98% of incoming price data.
This is the full story of what happened, why it happened, and what we’re going to do about it
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