In a shockingly rare move, Néw York’s Board of Regents refused to approve a batch of charters recommended for renewal by Néw York City.

Regents’ chair Merryl Tisch has expressed her desire to expand the charter sector. But each of the schools delayed or denied had serious problems, either with low test scores or an unusually harsh disciplinary policy.

The flap last month over an Albany charter proposal may have made the Regents willing to exercise oversight.