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12.8 Attack and Defense Database

The patterns in `attack.db' and `defense.db' are used to assist the tactical reading in finding moves that attacks or defends worms. The matching is performed during make_worms(), at the time when the tactical status of all worms is decided. None of the classes described above are useful in these databases, instead we have two other classes.

For each `O' worm in the pattern that can be tactically captured (worm[m][n].attack_code != 0), the move at `*' is tried. If it is found to defend the stone, this is registered as a reason for the move `*' and the defense point of the worm is set to `*'.
For each `X' worm in the pattern, it's tested whether the move at `*' captures the worm. If that is the case, this is registered as a reason for the move at `*'. The attack point of the worm is set to `*' and if it wasn't attacked before, a defense is searched for.

Furthermore, `A' patterns can only be used in `attack.db' and `D' patterns only in `defense.db'. Unclassified patterns may appear in these databases, but then they must work through actions to be effective.

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