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Hello! QBSolv is now deprecated and it is recommended by D-Wave to use dwave-hybrid.
QBSolv makes uses of the tabu algorithm when running on classical solvers. More information can be found on the docs. Infeasible solutions have not been reported before but I would recommend looking into dwave-hybrid. Let us know if this answers your question!
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Thanks for your response. In light of current dwave-hybrid approaches, I have used the D-wave Simulator for simulated annealing (neal - https://docs.ocean.dwavesys.com/projects/neal/en/latest/reference/sampler.html). Like QBSolv, it is also returning infeasible solutions. In the case of D-wave simulators, are they suitable for large problems, and can they produce unfeasible solutions? I'm sure I'm working with the correct QUBO array for the problem.