The 4 wheel combination lock AMIG from Spain has false gates and serves as an example here. This video explains how usual combination padlocks work, why they can be decoded and explains methods to defeat false gates. It covers some basic methods, so please also check out this playlist for more options on other locks:    • Lock Picking  decoding combination l...  

3 wheels, only true gates, easy
   • (picking 101) ABUS 145/20 3 wheel com...  

4 wheels, false gates, method: loosness detection
   • (picking 115) ABUS 165/40 4wheel com...  

3 wheels, only true gates, locked in open position
   • (picking 175) Tricycle 3 wheel combin...  

4 wheels, false gates, method: impact to next binder
   • (picking 211) Old BURG 4 wheel combin...  

3 wheels, only true gates, method: impact to next binder and disassembling
   • (picking 214) Two Master 3wheel comb...  

4 wheels, only true gates, method: pulling strength
   • (picking 221) Abus 4 wheel combo padl...  

4 wheels, only true gates, loosness detection
   • (picking 239) Master 4 wheel combinat...  

4 wheels, only true gates, "fuzzy decoding" (loosness area)
   • (picking 206) Master 4wheel combinat...  

bicyle lock with antipick features
   • (picking 160) ABUS 4 wheel combinatio...