Thanks to Andrew Branca now you have a reference:
Only 13 Duty to Retreat States (as of 9/4/17)
Arkansas
Connecticut
Delaware
Hawaii
Maryland
Massachusetts
Minnesota
Nebraska
New Jersey
New York
North Dakota
Ohio
Rhode Island
Plan accordingly.
New York has a strong affirmative defense clause while the duty to retreat outside the home is only when it can be done safely which is as vague as the proper clause requirement for pistol licenses. The affirmative defense has made it a non-issue in the state, even NYC.