Falling Dominoes

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An example puzzle from WPC 2017 IB: how many dominoes will remain standing?

The image below depicts the top view of a set of dominoes (as represented by the picture on the left) which are placed on a level floor. They are pushed simultaneously in the direction of the given arrows. Identify the number of dominoes that will stand erect, i.e. not fall.

(Rules and example from WPC 2017 IB)

History of the puzzle[edit]

WPC 2017 IB names this type among the "puzzle types that are more likely to be seen in mainstream puzzle platforms, and are familiar to puzzle enthusiasts regardless of WPC experience", but no instance of this puzzle aside of WPC puzzle have been found so far.

Appearances in the past WPCs[edit]