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Quick answer: “Cạ-to-Chắn Upgrade” means A Cạ-to-Chắn upgrade happens when a previously flexible Cạ is completed into an identical pair, increasing hand stability for a win path.

Mechanics

Cạ-to-Chắn Upgrade

A Cạ-to-Chắn upgrade happens when a previously flexible Cạ is completed into an identical pair, increasing hand stability for a win path.

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Cạ-to-Chắn Upgrade - Definition & Usage | Card Games Academy