What Is British Parliamentary Debate? A Beginner's Guide

If you've been to a debate tournament — or you're about to go to one — you've probably heard people talk about "BP." British Parliamentary debate is the most widely used debate format in the world. It's the format at the World Universities Debating Championship, it's what most Canadian university debate societies practice, and it's increasingly common at high school competitions in BC and across Canada.

It's also one of the most confusing formats if you've never done it before. Four teams? Two on the same side? What does "closing" even mean? This guide breaks down everything you need to know to understand BP — and to start competing in it.

The Basic Setup

A BP round has four teams of two debaters. The four teams are split into two sides:

Government (Proposition) side: Opening Government (OG) and Closing Government (CG). Both teams argue in favor of the motion.

Opposition side: Opening Opposition (OO) and Closing Opposition (CO). Both teams argue against the motion.

The eight debaters speak in a set order, alternating between government and opposition. Each speaker gets 7 minutes (in most high school and university tournaments). The speaking order is: Prime Minister (OG), Leader of the Opposition (OO), Deputy Prime Minister (OG), Deputy Leader of the Opposition (OO), Member of Government (CG), Member of Opposition (CO), Government Whip (CG), Opposition Whip (CO).

How Is It Different from Other Formats?

The biggest difference between BP and formats like CNDF or Cross-Examination is that you're competing against three other teams, not one. At the end of the round, the judge ranks all four teams from first to fourth. You're trying to beat not just the other side, but also the other team on your own side.

This creates a unique strategic challenge. Opening teams set up the debate and establish the main arguments. Closing teams need to extend the debate — they must bring genuinely new analysis or arguments that build on what the opening teams said but go further. A closing team that simply repeats what the opening team already argued will be ranked below them.

The other major difference is that BP motions are typically announced just 15 minutes before the round begins. There's no time for deep research or evidence preparation. You get the motion, discuss strategy with your partner for 15 minutes, and then the round starts. This makes BP a test of quick thinking, broad knowledge, and the ability to construct arguments on the fly.

Understanding the Positions

Each position in a BP round has a specific role, and understanding these roles is key to performing well.

Opening Government (OG). The OG defines the motion — they decide what the debate is actually about by explaining how they interpret the topic and what their specific policy or stance is. The Prime Minister sets up the case (definition, framework, first argument), and the Deputy Prime Minister extends it with a second argument and responds to the OO. OG has the advantage of framing the debate but the disadvantage of going first without knowing what anyone else will say.

Opening Opposition (OO). The OO responds to the OG's case and presents their own arguments against the motion. The Leader of the Opposition typically rebuts the PM's arguments and presents a counter-case, while the Deputy Leader extends the opposition's arguments and responds to the DPM. OO needs to directly engage with OG's framing — if they ignore the definition and argue about something else, judges will penalize them.

Closing Government (CG). This is where BP gets interesting. The CG needs to do two things: support the government's overall position (they can't contradict OG) and bring something new to the table that justifies their existence in the debate. This is called an "extension" — a new argument, a new mechanism, a new analysis that the opening half didn't cover. The Member of Government delivers the extension, and the Government Whip summarizes the entire government case while emphasizing why CG's contribution was the most important.

Closing Opposition (CO). Same challenge as CG, but on the opposition side. The Member of Opposition needs a strong extension that goes beyond what OO already argued, and the Opposition Whip summarizes and weighs the debate from the opposition's perspective.

Points of Information (POIs)

POIs work the same way in BP as in other Parliamentary formats. During a speech (except during the first and last minute, which are "protected time"), any debater from the opposing side can stand up and offer a POI. The speaker can accept or decline. If accepted, the person offering the POI has about 15 seconds to make their point or ask a question.

In BP, POIs are especially important because they're one of the main ways judges assess engagement. Accepting zero POIs suggests you're afraid of challenges. Offering zero POIs suggests you're not paying attention. Aim to accept at least one or two per speech, and offer them strategically — a well-placed POI that disrupts the other side's argument can be worth as much as an entire argument in your own speech.

How Judging Works in BP

Judges in BP rank the four teams from first (best) to fourth (worst). They also assign individual speaker scores, typically on a scale from 50 to 100, with 75 being an average speech.

Here's what judges are weighing: the quality and originality of arguments, how well each team engaged with the other teams' arguments, the strength of extensions (for closing teams), delivery and persuasiveness, and strategic use of POIs. For a more detailed breakdown of what judges evaluate, see our post on what judges look for in a debate round.

One thing that trips up newcomers: you can win your half of the debate (beat the other team on your side) while losing the overall round. For example, CG might rank first even if OG ranks third. Each team is judged independently.

Common Beginner Mistakes in BP

Not having a real extension (closing teams). The most common mistake in BP is a closing team that just repeats what the opening team said in slightly different words. Your extension needs to be genuinely new — a new argument, a new perspective, a new area of analysis. If the judge can't identify what you added to the debate, you'll rank below the opening team.

Knifing your own side. In BP, you can't directly attack the team on your own side. CG can't say "OG's arguments were wrong" — they need to build on OG's case, not tear it down. You can subtly shift emphasis, but outright contradiction (called "knifing") is penalized by judges.

Ignoring the other half of the debate (closing teams). Closing teams sometimes focus entirely on their extension and forget to respond to what happened in the opening half. The best closing speeches weave together a response to the other side's opening arguments with the team's own new contribution.

Speaking too fast. BP motions are announced 15 minutes before the round, so many debaters try to cram as much as possible into their 7 minutes. But a clear, well-structured speech with three strong points beats a rushed speech with six half-developed ones. Slow down, especially on your most important arguments.

Why BP Matters for High School Debaters

If your child plans to debate in university — and many competitive high school debaters do — BP is the format they'll encounter. UBC, SFU, McGill, U of T, Queen's, Western, and virtually every other Canadian university with a debate society practices BP. Getting comfortable with it in high school gives students a significant head start.

BP is also the format used at several major high school competitions, including the National British Parliamentary Championships (held each December) and an increasing number of invitational tournaments across BC. The BC Provincial BP Championships is one of the most competitive high school events in the province.

At DSDC, our Senior class (Grades 10-12) and Advanced Competitive class include extensive BP training, including practice rounds, motion analysis, and strategy for each position. Our coaches include competitors from the World Universities Debating Championship and Canadian National BP Championships.

Ready to Get Started?

BP can feel overwhelming at first — four teams, eight speakers, 15-minute prep. But once you understand the structure and roles, it's one of the most exciting and rewarding debate formats out there. If your child wants to learn BP or improve their existing BP skills, book a free consultation and we'll find the right class for their level.

Explore our classes or book a free consultation to get started.