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I'm not particularly familiar with QMC, although I do know of it. I was just adding a comment in support of this not being a particularly revolutionary methodology because, althoug…

Given enough time and a well-considered methodology, yes. I know two groups that work directly upon this and have great results.

The problem is that you don't know what the sources of error are. In methods like density functional theory (DFT), or other post Hartree-Fock calculations, the sources of error are…