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12.6 Autohelper Actions

As a complement to the constraints, which only can accept or reject a pattern, one can also specify an action to perform when the pattern has passed all tests and finally has been accepted.


Pattern EJ4

...*.     continuation


...*.     never play a here


The line starting with `>' is the action line. In this case it tells the move generation that the move at a should not be considered, whatever move reasons are found by other patterns. The action line uses the labels from the constraint diagram. Both constraint and action can be used in the same pattern. If the action only needs to refer to `*', no constraint diagram is required. Like constraints, actions can span multiple lines.

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