diff --git a/worker.js b/worker.js
index e405f4e..fa37797 100644
--- a/worker.js
+++ b/worker.js
@@ -72,6 +72,14 @@ async function main() {
     for (const strategy of strategies) {
       if (!strategy.enabled) continue;
 
+      // FIX: Prevent parallel betting!
+      // If the strategy has an unresolved position in limbo, it MUST wait.
+      // This protects the strict mathematical sequence of Martingale systems.
+      const acct = paper._getAccount(strategy.name);
+      if (acct.openPositions.size > 0) {
+        continue;
+      }
+
       const signal = strategy.evaluate(state);
       if (signal) {
         console.log(`[Worker] Signal from ${strategy.name}: ${signal.side} @ ${signal.price}¢ — ${signal.reason}`);