A farmer needs to cross a river with a cat, a mouse, and a bag of catnip. The boat can carry the farmer and one item at a time. If left alone together: the cat will eat the mouse, and the cat will destroy the catnip (cats gonna cat). The mouse ignores the catnip. How does the farmer get everything across? Show all steps.

Judge: Perfect solution with optimal 7 crossings and no constraint violations. Every step tracks state on both sides of the river. The classic cat-first, bring-cat-back trick is correctly applied, and the constraint that mouse ignores catnip is properly leveraged.

Judge: Optimal 7-step solution with complete state tracking at every step. Correctly identifies that cat must be brought back (Step 4) to prevent constraint violations. Clearly shows who is on each bank after every crossing. No constraint violations (cat never alone with mouse or catnip). The key insight about bringing the cat back is explicitly called out. Excellent presentation.

Judge: Correct optimal solution in 7 crossings with no constraint violations. All steps are clearly enumerated and the state reasoning is sound -- cat is the problematic item (conflicts with both mouse and catnip), so it must be brought back on step 4. The format is clear with numbered steps and bold annotations. Correctly identifies that mouse and catnip together is safe. Complete and well-explained.

Judge: Correct 7-crossing solution with no constraint violations. Every step is shown with clear state tracking (who's on each bank and safety verification). Correctly identifies it as the wolf-goat-cabbage variant. The key insight -- take the cat first, bring it back on the return trip -- is correctly applied. Optimal solution.

Judge: Solution contains two constraint violations: Step 1 leaves Cat and Catnip alone (marked safe, but prompt says cat will destroy catnip), and Step 6 leaves Cat and Catnip alone on the right bank. The model misread the constraints, treating Cat+Catnip as safe. The correct solution requires taking the Cat first. Presentation is clear but the answer is wrong.

Judge: The solution violates hard constraints: Step 1 takes the mouse across, leaving cat and catnip alone on the left bank — but the cat destroys catnip when left unsupervised. The correct approach is to take the cat first. The presentation is clear and well-formatted, but the core logic is wrong. All items do end up across, but the path is invalid.

Judge: The model gets stuck in a loop of failed attempts and never arrives at a valid solution. It correctly identifies the constraints and starts with the right move (take cat first), but then gets confused trying different approaches and the response is truncated mid-attempt. The correct solution requires bringing the cat back on a return trip, which the model briefly considers but dismisses incorrectly.

Judge: Solution is invalid. Step 3 places the mouse on the far side with the cat, leaving them alone together -- direct constraint violation. Steps 6-7 are incoherent (brings catnip back for no reason, then tries to combine multiple trips in one step). The model clearly didn't track the state on each side of the river.

Judge: Response is truncated after the initial state setup. Sets up the problem correctly with notation and rules but never provides any crossing steps. The solution is incomplete — we cannot verify if constraints are satisfied or if all items reach the other side.