Poker Term

关煞位河牌圈静态隔离加注（CO River Isolation Raise Static）

In the river, the cutoff player makes an isolation raise against a single opponent, assuming the opponent's range or strategy does not change in response to this raise.

Term Explanation

"CO River Isolation Raise Static" is a combined poker term describing an isolation raise executed by the Cutoff (CO) player on the river, where the opponent's decision-making pattern is considered static — meaning the opponent does not adjust their range or tendencies in response to this raise.

Example Scenario

A typical situation: Preflop, the CO player opens for a raise, and only the big blind calls. Both players enter a heads-up pot. After checking or betting on the flop and turn, the action reaches the river. The CO player believes the opponent's range is wide and likely includes medium-strength hands, so they make a large raise (isolation raise) aiming to force the opponent to fold marginal hands while extracting value from calling hands. Here, "static" means the CO assumes the opponent will not detect the isolating intent of the raise and counter it (e.g., by bluff-raising).

Strategic Implications

  • Static Assumption: The opponent does not adjust their frequency to the CO's raising pattern. This typically applies against weak players or in short-term heads-up situations.
  • Isolating Purpose: The raise aims to narrow the opponent's range, forcing them to fold medium-strength hands, leaving only hands that either call for value or bluff.
  • Positional Advantage: The CO position on the river has the last action or close to it, allowing adjustments based on the opponent's response.

Notes

  1. This strategy is effective against passive or predictable opponents. Against aggressive or adaptable players, the static assumption may fail, leading to re-raises or bluffs.
  2. Raise sizing should be based on pot size and opponent's range, typically between 50% and 100% of the pot.
  3. An isolation raise has positive expected value only when the CO has a clear read on the opponent's range.

Relationship to Other Concepts

  • Opposite of "dynamic isolation raise," where the opponent adjusts their strategy.
  • Often used in conjunction with range analysis and pot odds.