JOSEKI Volume 1: FUNDAMENTALS. Robert Jasiek

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1 JOSEKI Volume 1: FUNDAMENTALS Robert Jasiek 1

2 Table of Contents 1 Introduction The Difficulty of Understanding Josekis How to Read this Book Overview Acknowledgements and Technical Remarks What Is a Joseki? Model Opinion and History Local Equality Occupying an Empty Corner The 3-3 Point The 3-4 Point The 3-5 Point The 3-6 Point The 4-4 Point The 4-5 Point The 4-6 Point The 5-5 Point The Start of the Opening Introduction Symmetrical Moves

3 3.9.3 The Asymmetry of the The Asymmetry of the 3-5 and the Empty Corners during the Middle Game Timing The Most Important Corner Where to Play in the Corner Examples First Move in the Center The Point and Nearby Points Mirror Go Center Influence Irregular Moves Corner Enclosures Introduction Features of a Corner Enclosure Open Corner Closed Corner Open Side Closed Side Narrow Enclosure Wide Enclosure Approach Move to a Corner Stone Introduction

4 6.2 Entering the Corner Between Corner and Side Checking Extension from a Side General Low and Near Low and Far High and Near High and Far Center Block Middle Game Invasion or Reduction Ko Threat or Ladder Breaker Pincer Introduction Features Near and Low Near and High Far and Low Far and High Very Far and Low Very Far and High Center Block Examples of Not Playing a Pincer Returning the Pincer

5 7.12 Other Pincers Symmetries The Colour Symmetry The Corner Symmetries of Mirroring and Rotation The Symmetry of a Corner Enclosure The Symmetry of a Corner Stone and Approach Move Move Types Introduction Connection General String Connection Direct Connection Indirect Connection Cut General Crosscut Large Scale Cut Invasion Capture General Normal Captures Cut and Capture Net

6 9.4.5 Ladder Removal Contributing to a Capturing Race Eyespace and Territory General Protecting and Expanding Eyespace and Territory Reduction Extension General Normal Extension Entering the 3-3 Point Checking Extension Pressing Setting up Pressure from above and Pressing Fencing in Introduction to Thick Shapes Thick Extension Single Extension Bipolar Extensions Multiple Thick Extensions from a Crosscut Thick Block General Directional Block

7 Connecting Block Cutting Block Thick Connection Thick String Connection Thick Diagonal Connection Thick Diagonal Pair Thick Diagonal Pair and Jump Thick Diagonal String Connection Thick Jump Standard Shape Solidified Standard Shape Standard One-Point Jump Jump from Hanging Connection Jump from a Thick Wall Thick Cut Protection Solid Connection Hanging Connection Empty Net Thick Throw-in Thick Turn Attacking a Single Stone Worth Defending Leaning on a Light Stone Playing at the Head of at least Two Stones

8 Mutually Blocking Turns Successive Turns Thick Capture Light and Thin Shapes Short Light Jump Thin Block Thin Connection and Thin Turn Light Remainder Attachment Diagonal Attachment Jumping Attachment Nose Attachment Clamp Free Attachment Creating Possibilities Wedge Threatening a Connection Preparing a Crosscut Threatening a Cut Making Cuts Severer Atari Threatening a Capture Threatening to Fence in

9 Threatening a Squeeze Putting Helping Stones in front of a Wall Eliminating Possibilities Escape from Atari Defense against Capture Miscellaneous Examples Sacrifice Meanings of a Stone Introduction Construction Defense Connection Construction of a Development Direction or Movement Protecting and Expanding Eyespace and Territory Installation of a Proto-group Construction of a Group Construction of a Sphere of Influence Construction of Thickness Developing a Nearby or Another Group Destruction Cut Reduction Weakening

10 Attack Combined Construction and Destruction Capture Block Exchange Creating Possibilities Threatening Thick Shape Threatening a Connection Threatening a Cut Making Cuts Severer Threatening a Capture Threatening a Break-in Creating Miai to Develop Either Group Test Eliminating Possibilities Development Directions General Corner Movement to the Corner Intended Movement to the Corner Corner Block Block Corner Block and Edge Reduction

11 Corner Block with Threat Edge Edge Block with Movement to the Corner Edge Block Intended Edge Block Edge Block with Movement along the Edge Between Edge and Side Side Side Block and Corner Reduction Side Block Intended Side Block Side Block and Movement to the Center Side Block and Intended Movement to the Center Side Block with Threat Between Side and Center Block between Side and Center Block between Side and Center with Threat Center Center Block with Intended, Not Urgent Movement Center Block with Intended, Urgent Movement Center Block with Threat Moving Out Intention of Moving Out

12 11.8 Developing from a Crosscut Miscellaneous Evaluation of Territory Local Move Selection Aspects of Extensions and Checking Extensions The Gap Between a Wall and Extension When to Make An Extension When Not to Make an Extension Where to Play a Checking Extension The Behaviour of Some Specific Shapes Bad Escape from an Indirect Capture How to Play Nets The Vital Point of Two or Three Stones Capturing the Cutting Stone Superfluous Cuts of Successive Turns Exercises Problems Answers Index

Each group is alive unless it is a proto-group or a sacrifice.

Each group is alive unless it is a proto-group or a sacrifice. 3.8 Stability The concepts 'stability', 'urgency' and 'investment' prepare the concept 'playing elsewhere'. Stable groups allow playing elsewhere - remaining urgent moves and unfulfilled investments discourage