If Governor Andrew Cuomo angered Mayor Bloomberg by batting off his calls to end seniority-based layoffs, perhaps the governor redeemed himself in the mayor’s eyes today. Cuomo sent the chancellor of New York’s Board of Regents, Merryl Tisch, a letter saying he believes that student test scores should count for a larger portion of teachers’ annual evaluations.

His comments are a critique of a set of regulations put out by the Board of Regents that they will vote on next week. The regulations are to be used by New York City and other districts as a guide to implementing the state’s new teacher evaluation system.

In a statement today, Tisch vowed to support Cuomo’s recommendations at the meeting next week, saying that they “will lead to an even stronger teacher and principal evaluation system for New York.” It’s not clear if the other members of the board will agree with Tisch. A recent appointee to the board, the former city school official Kathleen Cashin, is a quiet critic of Bloomberg’s.

Another hurdle involves getting the teacher evaluations implemented in school districts. The new state law revising the evaluation system granted final power to local collective bargaining talks between districts and unions. That means that no evaluation system will become final without local unions’ approval.

United Federation of Teachers President Michael Mulgrew responded to Cuomo’s letter obliquely, saying only: “We look forward to discussing the Governor’s recommendations with the Regents.”

Bloomberg’s reaction was more effusive:

“The thoughtful recommendations made today by Governor Cuomo will greatly improve the rigor of these new evaluations, and I am heartened that the Regents agreed to adopt them. But it will take the sustained commitment of all invested parties – and perhaps most importantly, the cooperation of the teachers union – if we are to make this evaluation system a reality.”

Here’s Cuomo’s complete letter: