A Snarkbreaker is a single-channel recipe to "undo" a Snarkmaker. The one in current use was found by Simon Ekström and Chris Cain in June 2017. It can be used to change the direction of a construction arm, and is used for that purpose in several Demonoid and Orthogonoid spaceships.
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Moving the elbow block by one full diagonal requires adjusting the final three gliders by 2fd. Half-diagonal adjustments are possible: move the elbow block to the other side of the single-channel lane and move the final three gliders by 1fd.
In the pattern above, a sabotaged glider is present at T=0. This shows the earliest possible location of the initial glider in a recipe following the Snarkbreaker.