Test a read with nodelocking

In Study's Action line, select the postflop decision you want to change. Use its Nodelock lock icon. If you are inspecting an earlier decision, focus that decision first so the icon edits the intended node.

Check the acting player, street, board, available actions, and baseline frequencies. Nodelocking is available at postflop decisions, not preflop actions or street headers. Current Study supports up to two locked nodes in a solve view; remove an existing lock before adding a third.

The Study editor has three modes:

• Range: set aggregate action frequencies across the player's range. Use the frequency inputs or sliders, and lock an action frequency when you want to hold it while adjusting others. An overall 60% call target does not mean every combination calls 60%.
• Category: add a rule, choose an available hand, draw, detail, or equity category, then set its action frequencies and lock the rule. Categories must be unique and contain available combinations. Lock other hands preserves the other hands' baseline behavior when you want a more targeted change.
• Hand: explicitly fix selected combos’ strategies; range and category targets cannot override them. Those frequency targets apply to the remaining unlocked combos; displayed results include the fixed combos. Expand a starting hand to its exact combos, edit the action mix, and lock the intended combos. You can lock all combos at their current frequencies or unlock them all. On boards with suit-isomorphic combos, the editor identifies linked groups; their edits and locks stay linked.

For example, “call more often with weak pairs here” is more specific than “this opponent is loose.” Use Category if a supported category captures your read, or Hand for a selected set of combos.

Fast Lock presets are not currently exposed in the Study editor. The supported workflow here is Range, Category, or Hand.

The three tabs work together. Adjusting Range automatically enables its overall target. Locked Category rules and Hand combos remain included when you switch tabs. Tab counts show included rules, and Combined preview shows their joint result. Apply all rules submits them together. Lock other hands is available only when overall frequencies are off and excludes explicitly locked Hand combos. Conflicting targets may not all be achievable.

Check Lock previous nodes before choosing Apply all rules:

• Own nodes preserves earlier decisions by the player whose strategy you are locking.
• All nodes preserves both players' earlier decisions along the preceding line.

These controls keep selected earlier strategies at their baseline while testing the change. They do not apply the same new frequency to every prior decision.

Apply the lock and wait for the updated solution. Use Compare at the relevant decision to inspect Current lock against GTO and any available profile source. Follow the action to the opponent's response to see how it changes; the locked node itself is the behavior you imposed.

Reopen the locked node to edit it. Reset restores the editor's opening values; Unlock removes the lock at that node. Neither is the same as resetting the entire custom postflop setup.

Test a milder assumption while keeping the other setup inputs fixed. If the preferred response changes sharply, your conclusion depends heavily on the read.

Nodelocking changes strategy at a decision. To change which hands arrive there, use range editing. To study a broader behavioral model across the postflop, use player and pool profiles.