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Principles of Fuseki
Kyu Dan System
Video membership
- Learn 48 core principles of Go
- Explore weaknesses with TRAP Opener
- Learn Essential Josekis & Essential Invasions
- Lessons on Estimation & Thickness & how to properly attack
Go Equipment Collection
Yunzi Double-Convex Go Stone Set
These classic Yunzi stones are made from a lead-free mineral blend based on the traditional Yunnan formula. Known for their solid weight, matte texture, and satisfying feel, they offer a reliable, tournament-level playing experience. Black stones reveal a subtle dark green translucence under strong light, a signature trait of traditional Yunzi.
"New Yunzi" Double-Convex Go Stone Set
The biggest upgrade from traditional Yunzi: "New Yunzi" stones are virtually free of air bubbles, giving them a flawless, smooth finish that looks clean and feels premium. Although it is "New Yunzi", it has nothing to do with Yunzi. It is a brand new kind of stone set that is made from a mixture of minerals and gems to recreate the texture of jade.
Reversible 1.57 inch Shin Kaya Go Board
This 1.57-inch (4cm) Shin Kaya Go board is a budget-friendly, portable option for everyday study and casual play. It's lightweight, easy to carry, and built to last.
2.4 inch Shin Kaya Go Board
This 2.4-inch (6cm) thick Shin Kaya Go board is a solid choice for players who want a traditional, high-quality feel without the high price of premium solid-wood boards. Whether you're studying kifu alone or playing with a friend, this board gives you a more immersive and authentic experience.
Single-Piece 2.4" Shin Kaya Go Board
This is a true single-piece Go board, carved from one solid slab of Shin Kaya wood. Unlike jointed boards, it offers consistent color and grain across the entire surface—clean, seamless, and naturally elegant.
Refined Set – "New Yunzi" + Cedar Bowls + 1.57" Reversible Board
The Refined Set is built for players who want upgraded stones and a clean, modern playing experience. It features our improved New Yunzi stones, a 1.57-inch reversible board, and a pair of classic cedar bowls—ideal for study, daily games, or introducing others to Go.
Refined Pro Set – "New Yunzi" + Cedar Bowls + 2.4" Single-Sided Board
The Refined Pro Set is our most premium option—built for Go players who want flawless stones, upgraded handling, and the presence of a tournament-style board. It features our New Yunzi stones, a thick 2.4-inch single-sided board, and a pair of cedar wood bowls to complete the full experience.
Classic Set – Yunzi Set + Cedar Bowls + 1.57" Reversible Board
The Classic Set is a complete, well-balanced Go setup perfect for study, casual play, or travel. It features the timeless appeal of traditional Yunzi stones, paired with cedar wood bowls and a 1.57-inch reversible board for a functional and authentic playing experience.
Classic Pro Set – Yunzi + Cedar Bowls + 2.4" Single-Sided Board
The Classic Pro Set is built for players who want a more immersive, tournament-style Go experience. It features the trusted quality of traditional Yunzi stones, a pair of elegant cedar wood bowls, and a 2.4-inch thick single-sided board that brings weight and presence to every game.
Yunzi Double-Convex Go Stone Set
These classic Yunzi stones are made from a lead-free mineral blend based on the traditional Yunnan formula. Known for their solid weight, matte texture, and satisfying feel, they offer a reliable, tournament-level playing experience. Black stones reveal a subtle dark green translucence under strong light, a signature trait of traditional Yunzi.
"New Yunzi" Double-Convex Go Stone Set
The biggest upgrade from traditional Yunzi: "New Yunzi" stones are virtually free of air bubbles, giving them a flawless, smooth finish that looks clean and feels premium. Although it is "New Yunzi", it has nothing to do with Yunzi. It is a brand new kind of stone set that is made from a mixture of minerals and gems to recreate the texture of jade.
Reversible 1.57 inch Shin Kaya Go Board
This 1.57-inch (4cm) Shin Kaya Go board is a budget-friendly, portable option for everyday study and casual play. It's lightweight, easy to carry, and built to last.
2.4 inch Shin Kaya Go Board
This 2.4-inch (6cm) thick Shin Kaya Go board is a solid choice for players who want a traditional, high-quality feel without the high price of premium solid-wood boards. Whether you're studying kifu alone or playing with a friend, this board gives you a more immersive and authentic experience.
Single-Piece 2.4" Shin Kaya Go Board
This is a true single-piece Go board, carved from one solid slab of Shin Kaya wood. Unlike jointed boards, it offers consistent color and grain across the entire surface—clean, seamless, and naturally elegant.
Refined Set – "New Yunzi" + Cedar Bowls + 1.57" Reversible Board
The Refined Set is built for players who want upgraded stones and a clean, modern playing experience. It features our improved New Yunzi stones, a 1.57-inch reversible board, and a pair of classic cedar bowls—ideal for study, daily games, or introducing others to Go.
Refined Pro Set – "New Yunzi" + Cedar Bowls + 2.4" Single-Sided Board
The Refined Pro Set is our most premium option—built for Go players who want flawless stones, upgraded handling, and the presence of a tournament-style board. It features our New Yunzi stones, a thick 2.4-inch single-sided board, and a pair of cedar wood bowls to complete the full experience.
Classic Set – Yunzi Set + Cedar Bowls + 1.57" Reversible Board
The Classic Set is a complete, well-balanced Go setup perfect for study, casual play, or travel. It features the timeless appeal of traditional Yunzi stones, paired with cedar wood bowls and a 1.57-inch reversible board for a functional and authentic playing experience.
Classic Pro Set – Yunzi + Cedar Bowls + 2.4" Single-Sided Board
The Classic Pro Set is built for players who want a more immersive, tournament-style Go experience. It features the trusted quality of traditional Yunzi stones, a pair of elegant cedar wood bowls, and a 2.4-inch thick single-sided board that brings weight and presence to every game.
Student Reviews
Frequently Asked Questions
Can't find what you're looking for? Check out our full documentation.
Who is this for?
The Kyu Dan System is ideal for players from complete beginners to intermediate players. If you're ready to take your study seriously, we're here to guide you.
Read moreHow does the personalized plan work?
We begin by reviewing several of your games to identify patterns and areas to improve. Based on that, we craft a roadmap that connects directly to specific lessons.
Read moreHow often is content updated?
We add 4 new lessons every month, ensuring the curriculum stays fresh and aligned with your progress.
Read moreIs this just video content?
No, it's a structured learning experience. Lessons include reviews, assignments, and feedback loops so you can actively learn and apply concepts.
Read moreWhat is TRAP Opener?
A TRAP opener is a structured opening system designed to create difficult decisions for your opponent early in the game. It's not a trick play or cheap tactic, it sets up positions where your opponent either falls into a losing sequence or is forced to navigate a much harder game. Even if the trap doesn't trigger, you're left with a strong, stable position that follows solid principles. It's a low-risk, high-reward way to take control from move one.
Read moreWhat if I have questions while learning?
As a member, you'll have access to our private Discord community where you can ask questions at any time, get personal guidance, and connect with others learning the same system.
Read morePrivate Lesson
Personal coaching
- 4 private lessons per month (about 1-2 hours each)
- Live review of one or more of your games every session
- Teaching game plus post-game review each week
- Custom study plan and daily tsumego guidance
- Full access to the Kyu Dan System (included, $18/month value)
- Ask Zee questions between lessons about positions or full games
Kyu Dan System
Video membership
- Learn 48 core principles of Go
- Explore weaknesses with TRAP Opener
- Learn Essential Josekis & Essential Invasions
- Lessons on Estimation & Thickness & how to properly attack
Who are the instructors?
A Go learning platform built for adults. Most Go content online is too theoretical, too technical, or too vague to apply in real games. Many platforms feature strong players, but playing well is not the same as teaching well. Here's what makes Simple Baduk special.
Read moreHow can I reach customer support?
You can email us anytime at help@zeejyan.com. We'll get back to you as quickly as possible.
Read moreHow do I provide feedback on the content?
We'd love to hear from you. Share your thoughts by emailing us at help@zeejyan.com or posting in our Discord channel, where our team and community can see your suggestions.
Read moreCan I request specific topics for future videos?
Absolutely. You can send your requests to help@zeejyan.com or drop them in our Discord channel. We're always open to ideas that help us create content you'll enjoy.
Read moreOverview
Last updated: October 8, 2025. Welcome to Simple Baduk (https://simplebaduk.com). We respect your privacy and are committed to protecting any personal information you choose to share with us. By using our website, you agree to the collection and use of information in accordance with this policy.
Read moreInformation We Collect
Personal Identification Information: We only collect personal information that you voluntarily provide, such as your name and email address, when signing up for our email list, creating an account, or placing an order. We do not collect data through tracking tools, cookies, or third-party analytics like Facebook Pixel.
Read moreHow We Use Your Information
We use the information you provide solely for: Sending product updates, discounts, and membership-related content. Providing access to your purchased or subscribed content. Customer support and order-related communication. We do not share, sell, or rent your personal data to anyone.
Read moreData Security
We use standard industry practices to store and protect your information. While no system is perfectly secure, we take all reasonable precautions to prevent unauthorized access or misuse.
Read moreYour Rights
You may request to view, update, or delete your data at any time. Simply email us, and we'll process your request as quickly as possible.
Read moreThird Party Websites
Users may find advertising or other content on our website that link to the sites and services of our partners, suppliers, advertisers, sponsors, licensors and other third parties. We do not control the content or links that appear on these sites and are not responsible for the practices employed by websites linked to or from our website.
Read moreChanges to This Policy
If we make significant changes to our Privacy Policy, we'll post the updated version here with a new "Effective Date."
Read moreDigital Products & Memberships
We offer a 30-day money-back guarantee on all digital products and memberships. If you're not satisfied for any reason, email us at help@zeejyan.com within 30 days of your purchase, and we'll process your full refund—no questions asked. Note: Some products may include a lifetime refund guarantee, which will be explicitly stated at the time of purchase. If your product includes this guarantee, you're covered beyond the standard 30-day window.
Read moreShipping Information
All orders are shipped from China and are typically processed within 3 to 5 business days before dispatch. For flat-rate shipping, tracking is not available during ocean transit. Once your order has been dispatched from China, you will receive a tracking number via FedEx or UPS. The tracking number will become active once the package arrives in the United States, allowing you to follow its progress to your door.
Read moreShipping Eligibility
We currently only ship to addresses within the United States. If you are located outside the U.S. and would like to place an order, please contact us first at help@zeejyan.com to discuss possible arrangements.
Read moreEstimated Delivery Time
Please note that delivery time does not include handling and processing. Handling & Processing: 3–5 business days. Shipping to the U.S.: 25–30 days on average. Possible Delays: In rare cases (such as customs processing or shipping congestion), delivery may extend to 35–55 days. There will be no additional import taxes or fees required upon delivery. Please ensure you are comfortable with this estimated timeline before placing your order.
Read moreTracking and Delays
Tracking information will be sent to you via email once your order is shipped. Please note that tracking updates may not appear until the package reaches the U.S. Occasional delays may occur due to customs processing, holidays, weather conditions, or postal service disruptions. We appreciate your patience and understanding.
Read moreReturns and Cancellations
If your order has already shipped and you wish to return it simply because you no longer want it, you must first receive the package before requesting a return. You will then need to ship it back to our New Jersey warehouse with postage paid by you, as we cannot recall packages once they are in transit. If your item is defective, we will cover the return shipping cost.
Read moreDamaged or Defective Items
If your item arrives damaged or defective, please contact us within 7 days of delivery at help@zeejyan.com. Please include your order number and clear photos of the item and packaging in the email. We will either send a replacement or issue a full refund. In these cases, we cover all return shipping costs.
Read moreNatural Material Disclaimer
All of our Go boards are made from natural Shin Kaya wood. Minor cosmetic variations—such as differences in color, grain patterns, joint lines, or small imperfections—are normal and not considered defects.
Read moreLost Packages
If your order has not arrived after 55 days and shows no movement or delivery confirmation, please contact us at help@zeejyan.com. After reviewing the tracking and confirming the loss, we'll offer you a replacement or a full refund.
Read moreNeed Help?
For any questions about your shipment, tracking updates, or return process, please contact us at help@zeejyan.com. We'll get back to you as soon as possible.
Read more