holy...... almost got CHARLES EDWARD KNIGHT, but.... stepped right on a pitbull for no reason
]]>Just guessed a combo lock! It had about 7 sticking switches, so I hit 2, 3, skipped to 5 and started mashing buttons. Noticed somewhere in there a door opened but I had already closed it. Luckily, I could exit and come back.
I wonder if the owner thinks I've cheated.....
I've actually guessed a few combo locks... it's always a fun feeling to cheat chance =P
]]>I wonder if the owner thinks I've cheated.....
]]>High tier house robbers can crack the stuff up no matter what. Infinite tools.
]]>FYI: chance calculation based on bit-lock, in which breaking of wired-wall-tile will destroy whole circuit, so you need to choose correct wire at the start. If there is no such protection, you can saw it from behind, breaking through tons of concrete
UPD: isn't OP tactic works only if homeowner is in his bed IRL? He can change code between attempts
]]>Step 1: Disable all commitment gates between you and the combination buttons so you can exit the house safely.
Step 2: Disable all commitment gates between you and the thing the combination buttons open.
Step 3: Calculate the value of tools needed to do this. It may be cheaper to just saw your way to the vault and then ladder over the powered trapdoor, or at least saw your way to the inverter switches to learn the combination for next time.
Step 4: If it's cheap to try new combinations it's time to run some numbers. The builder of the combination lock is abusing the fact that adding a single button doubles the total possible combinations. But as a robber we can abuse the fact that it is possible to check multiple combinations per run, and then return to try again. The trick is to not check the same combination twice. In the following example, I'll use an 8 switch combo.
There are 2^8 (256) total possible combinations, which seems huge at first, but if you break it down it's really not.
There is 1 combination with no buttons pushed
There are 8 combinations with one button pushed
There are 28 combinations with two buttons pushed,
56 with 3,
70 with 4,
56 with 5,
28 with 6,
8 with 7, and
1 with all buttons pushed.
Which means if you devise a method for checking 8 different combinations each time, you will only have to visit the house 70 times to try every 4 button combination. Throw a little probability into the game and this is how much it costs to break an 8 switch combo if the solution is a 4 button combo:
Commit gate disablement cost (Absolute minimum is 100, so I'll assume that. In all likelyhood the total will be closer to 400) * 35 = $3500 + the time to actually do it
Cost of sawing through half the map and placing a ladder over the powered trapdoor to get to the vault: 12*400 +1800 = $6000
In conclusion, solving combination locks isn't feasible. It is unfortunate that there isn't an alternate way to solve them.
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