🧩 Level 4 - Puzzle #290
📊 Professional
⭐ Hard
📝 67 Steps
🔧 6 Techniques
🎯 Current State
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🔧 Techniques Used
Hidden Single
51×
Pointing/Claiming
7×
Naked Quad
4×
Naked Triple
3×
XY-Wing
1×
XYZ-Wing
1×
📋 Solution Steps
All
Singles
Locked
Subsets
Fish
Wings
Chains
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