🧩 Level 4 - Puzzle #172
📊 Professional
⭐ Hard
📝 83 Steps
🔧 6 Techniques
🎯 Current State
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🔧 Techniques Used
Hidden Single
51×
Pointing/Claiming
10×
ALS-XZ
8×
Naked Quad
7×
Naked Pair
4×
Naked Single
3×
📋 Solution Steps
All
Singles
Locked
Subsets
Fish
Wings
Chains
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