Here's a quickie:
Let $r\ge2$. Does every connected $r$-regular bipartite graph contain a Hamiltonian cycle?
I've been playing around with this for almost an hour, but I can't prove it.
2026-03-25 18:53:52.1774464832
Does every connected $r$-regular bipartite graph contain a Hamiltonian cycle?
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The Horton graph is cubic, 3-connected, bipartite, and non-Hamiltonian. There is a conjecture of Barnette (see here) that cubic, 3-connected, bipartite, planar graphs are Hamiltonian. This has yet to be proven or disproven.