🧩 Level 4 - Puzzle #171
📊 Professional
⭐ Hard
📝 77 Steps
🔧 6 Techniques
🎯 Current State
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🔧 Techniques Used
Hidden Single
55×
Pointing/Claiming
12×
Naked Quad
6×
ALS-XZ
2×
Naked Pair
1×
Skyscraper
1×
📋 Solution Steps
All
Singles
Locked
Subsets
Fish
Wings
Chains
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