Bridge Unlocked teaches two bidding systems, each as a complete course: ACOL (weak no‑trump and four-card majors), and Strong No‑Trump and 5-card majors. When you join, you choose which one to start with.
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Choose Start for free on this site and we ask your text size, then your bidding system, before your first lesson. If you create your account first instead, the system is one of the joining questions (see Create your free account).
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At the bidding-system step, read the two options. In short: ACOL is what most clubs in Ireland and the UK play; Strong No‑Trump and 5-card majors is played in most online bridge and much of the rest of the world.
Open this picture full size. Step 2: the two systems, side by side at the chooser step. -
Not sure? Open the 30-second comparison on the same screen. It lays the difference out plainly, with no jargon.
Open this picture full size. Step 3: the comparison takes half a minute and settles most doubts. -
Choose one and carry on. Your courses, practice hands, Daily Deals and quizzes all arrive in that system’s version.
Changing later is safe. Progress in each system is kept separately, so nothing is ever overwritten or lost: see Switch your bidding system in Settings.
New to bridge? You don’t need to understand the difference yet. Choose the system played where you’ll play, and the lessons explain the rest.