River strategy is the most mathematically precise of all streets, as on the river there is no more equity to realize and decisions are purely about expected value based on hand distribution. Concepts of bluff frequency, pot odds, and value-to-bluff ratios become absolutely critical. A player with strong river strategy understands how to polarize their betting range, which hands to use as bluffs with blockers to the opponent’s nuts, and how to calibrate sizing to maximize EV. Perfect river strategy is the ultimate goal of solver study, as it is where the most costly EV mistakes occur.