Poker course
Defending the Open
I am in the CO. Someone opened. What do I do? Learn every seat's defense, one position at a time.
What Defending the Open covers
Learn to defend from every seat — HJ, CO, BTN, SB and BB — building a complete fold/call/3-bet response to an open raise position by position, the same way you built your opening ranges.
I am in the CO. Someone opened. What do I do? Learn every seat's defense, one position at a time.
Learning objectives
- Build a complete fold/call/3-bet defense range from HJ, CO, BTN, SB and BB against a real open
- Judge a hand by how it performs against THIS open from THIS seat, not by raw strength alone
- Weigh price, equity realization, position, players behind and stack depth together before continuing
Lessons in this module
- Facing an Open
- Your cards are only one part of the decision.
- Defending as HJ
- One seat past first-in — but still facing a tight, strong range.
- Defending as CO
- Two openers behind you now — and equity realization starts to matter.
- Defending as BTN
- When you can call and keep position, more hands can survive.
- Defending as SB
- A discount helps. Being out of position with the big blind behind hurts.
- Defending as BB
- You get the best price at the table — and some of the hardest postflop situations.
- Stack Depth Adjustments
- Stack depth changes what your hand is trying to accomplish.
- Build Your Defense Range
- Stop solving one hand at a time.
- Defense Room
- Read the open. Read the table. Build the response.
Key takeaway
Defending the Open is 9 lessons and roughly 172 minutes of interactive work. Learn to defend from every seat — HJ, CO, BTN, SB and BB — building a complete fold/call/3-bet response to an open raise position by position, the same way you built your opening ranges.
Every lesson in Defending the Open
- Facing an OpenYour cards are only one part of the decision.6 steps · 12 min
- Defending as HJOne seat past first-in — but still facing a tight, strong range.9 steps · 16 min
- Defending as COTwo openers behind you now — and equity realization starts to matter.14 steps · 18 min
- Defending as BTNWhen you can call and keep position, more hands can survive.12 steps · 18 min
- Defending as SBA discount helps. Being out of position with the big blind behind hurts.11 steps · 18 min
- Defending as BBYou get the best price at the table — and some of the hardest postflop situations.25 steps · 24 min
- Stack Depth AdjustmentsStack depth changes what your hand is trying to accomplish.16 steps · 20 min
- Build Your Defense RangeStop solving one hand at a time.13 steps · 20 min
- Defense RoomRead the open. Read the table. Build the response.18 steps · 26 min
Frequently asked questions
What is the Defending the Open courseModule?
Learn to defend from every seat — HJ, CO, BTN, SB and BB — building a complete fold/call/3-bet response to an open raise position by position, the same way you built your opening ranges. It contains 9 interactive lessons and takes about 172 minutes to complete.
How long does Defending the Open take?
About 172 minutes in total, split across 9 lessons you can take one at a time.
Is Defending the Open free?
Yes — this module is included on the free StackedPoker plan.
Related
Concepts, lessons and tools that build on this page.
- LessonBuild Your Defense RangeStop solving one hand at a time.
- LessonDefending as BBYou get the best price at the table — and some of the hardest postflop situations.
- LessonDefending as BTNWhen you can call and keep position, more hands can survive.
- ModulePreflop AggressionUnderstand 3-bets, 4-bets, squeezes and the battle for initiative.
- ModuleBuilding Your Preflop FoundationLearn why position, ranges and stack depth determine which hands enter the pot.
- ConceptPositionIP realizes ~10% more equity than OOP with symmetric ranges.
Source: Module structure and lesson list come from the StackedPoker curriculum.