Unsure of how verified 30 works or how I got the incorrect code

[grubbster]

I'm not sure if I'm fundamentally misunderstanding how verifier 30 works (which I guess would mean I'm unsure if how most/all of them work) or if I was somehow given the wrong answer, specifically on my second guess.

How I understood it was I guessed 243 and it checked if a certain color was equal to 4. It returned an x, meaning that yellow square was not equal to 4. Is my interpretation of this incorrect?

Edit: Seems bga doesn't like my screen shot. This was #c512ce1 with verifiers 16, 22, 26, 30, 36. I guessed 452 (a✓b✓dx), 243 (dxe✓), and final solution 324 (wrong) with the correct solution being 144.

[Jellby]

The verifier will say yes if a certain color is equal to 4 and no otherwise. You don't know which color, the machine does. You know the verifier must say yes for the secret code, so you know at least one of the three numbers must be 4.

You tested 243. You were not testing "if the yellow number is 4 in the secret code", you were testing "if the verifier is looking at yellow". You got a no, so the verifier is not looking at yellow. Now you know that at least one of blue and purple is 4 in the secret code, but you know nothing about yellow.