The following changes to the Rules were made in the edition published
on December 1, 2016.
Major Changes
-  I.D. Distracting Speech or Behavior
 
-  Misleading your opponent is no longer explicitly forbidden; the Rules Committee determined that such a rule was unenforceable.
 
-  II.C. Protocol
 
-  Tournament rules not to be used as a tool for intimidation.
 
-  II.D. Director's Discretion
 
-  Directors should try to unwind the progress of a game as necessary even to the point of un-starting a clock and returning time to a player.
 
-  III.A.1. References
 
-  OTCWL2016 is now in effect.
 
-  III.A.2. Tiles
 
-  Tile thickness and wear are now considerations.
 
-  III.G.2. Establishing Orientation
 
-  Ambiguous initial tile orientation should be clarified immediately.
 
-  III.G.3. Misoriented Tiles
 
-  Plays with misoriented tiles should be corrected, not challenged.
 
-  IV.B.3. Loose Tiles
 
-  Rules concerning this situation have been rewritten and expanded.
 
-  IV.B.4. Played Tiles Gone Missing
 
-  Rules concerning this situation have been rewritten and expanded.
 
-  IV.B.7. End of Game Underdrawing
 
-  If you don't record cume, then underdraw, the regular overdraw procedure applies.
 
-  IV.B.8. Overdrawing Tiles when Fewer than Seven in the Bag
 
-  Rules concerning this situation have been rewritten and expanded.
 
-  IV.B.9. Exposing Tiles when Fewer than Seven in the Bag
 
-  Rules concerning this situation have been rewritten and expanded.
 
-  IV.C.3. Tiles from an Adjacent Game 
 
-  Rules concerning the case where the situation is not immediately detected have been rewritten and expanded.
 
-  IV.C.4. Tile Bag Access
 
-  A new rule has been added to explain who has priority of tile bag access.
 
-  IV.F.1. How to Designate the Blank
 
-  If written, the blank must be in capital letters.
 
-  IV.I.2. Holding the Play
 
-  Players must now announce that they are drawing provisional tiles. The procedure for releasing a hold after the drawing of provisional tiles is now documented, as is the penalty for returning provisional tiles to the bag unseen.
 
-  IV.J.1. Software Self-Lookup Procedure
 
-  Re-adjudication is not permitted after tiles are commingled or a subsequent play made and clock started.
 
-  IV.K.4. Requesting a Second Opinion
 
-  If a player asks for a second opinion about a play's validity, and the second opinion contradicts the first one, then in the absence of a third opinion, the first opinion takes precedence.
 
-  VI.A. Word Reference
 
-  CSW2015 is now in effect.