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Study Diary

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BTN jam lock vs SB

NodelockICM23SB vs BTN

24bb effective · BTN opens 2bb · SB 3-bets to 6bb or effectively jams to 24bb

The adjustment

After locking BTN to shove a 2.2-percentage-point narrower range (11.4% → 9.2%) against SB’s non-all-in 6bb 3-bet, SB increases its 6bb 3-bets from 9.1% to 24.3%, while effective jams fall from 13.2% to 6.7%.

Calls and folds also change at the locked node; all other nodes remain unlocked.

ICM23 · Setup and opening range

Seven-handed stacks

UTG 19 · MP 23 · HJ 27 · CO 25 · BTN 24 · SB 30 · BB 21bb.

Blinds 0.5/1bb; initial pot 2.5bb. BTN (BU in HRC) opens to 2bb with a displayed 38.3% range. Four players fold before BTN.

SB’s raise to 24bb is an effective jam against BTN’s 24bb stack; SB starts with 30bb.

ICM23 · Directional risk premium

SB → BTN: +5.7% · bubble factor 1.26
BTN → SB: +6.4% · bubble factor 1.29

ICM23 scenario. Read from the row player toward the column opponent; the two directions differ.

SS1: Opening range and risk premium
SS1 · Opening range and risk premium · Click to zoom or open original

Baseline SB versus BTN’s open

SB’s displayed response: fold 76.3%, call 1.4%, raise to 6bb 9.1%, effective jam to 24bb 13.2%.

SS2: Baseline SB response
SS2 · Baseline SB response · Click to zoom or open original

Baseline BTN versus SB’s 6bb 3-bet

After SB raises to 6bb and BB folds, BTN can fold, call, or jam to 24bb. The header/tree jam value is 11.4%; the normalized bottom-bar jam share is 29.7%.

SS3: Baseline BTN response versus 6bb
SS3 · Baseline BTN response versus 6bb · Click to zoom or open original

Locked BTN response

Only this node is locked

BTN opens 2bb → SB 3-bets to 6bb → BB folds → BTN responds.

All other nodes remain unlocked, including BTN’s opening strategy and SB’s responses.

The displayed combo-range jam percentage decreases from 11.4% to 9.2%. Both call and jam branches have lock icons. Fold and call values also change, so this is not a jam-only adjustment.

BTN response: keep the two display scales separate
ActionHeader/tree baseline → lockedBottom bar baseline → locked
Fold22.8% → 24.6%59.4% → 64.0%
Call4.2% → 4.6%10.9% → 11.9%
Jam 24bb11.4% → 9.2%29.7% → 24.1%

Header/tree: displayed combo-range percentage. Bottom bar: normalized displayed BTN response mix. Do not read 9.2% as the frequency facing the 3-bet. The screenshots do not establish whether combo-lock or frequency-lock mode was used; card removal and bunching can distinguish action frequencies from combo percentages. HRC frequency-lock documentation.

SS4: Locked BTN response versus 6bb
SS4 · Locked BTN response versus 6bb · Click to zoom or open original

Recomputed SB versus BTN’s open

SB displayed action percentages, same decision node
ActionBaselineRecomputedChange (pp)
Fold76.3%68.2%−8.1
Call1.4%0.8%−0.6
Raise 6bb9.1%24.3%+15.2
Effective jam 24bb13.2%6.7%−6.5
Total raises22.3%31.0%+8.7
SS5: Recomputed SB response
SS5 · Recomputed SB response · Click to zoom or open original

Hand selection

■ 6bb 3-bet■ Effective jam to 24bb

Where SB still jams after the lock

SS5’s effective-jam branch lists these hand classes. Purple marks inclusion, not a 100% jam frequency. Its displayed total is 6.7%.

Which hands shift toward the 6bb 3-bet?

Selected hand-class action frequencies: baseline → recomputed. These are not weighted combo counts.

Exact per-hand jam frequencies and weighted combo counts need an HRC action-strategy export or the selected 24bb branch’s hand-level frequencies. Full SS5 source ↗

Compare the ranges

Range-only views retain every hand cell, action header and percentage bar. Click a range to zoom; full screenshots are linked beneath each view.

Five HRC source screenshots retained at original resolution. Displayed percentages are rounded.