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A move which is necessary to win a capturing race is called a semeai move. These are similar to attacking moves, except that they involve the simultaneous attack of one worm and the defense of another. As for attack and defense moves, it's important that all moves which win a semeai are found, so an informed choice can be made between them.
Semeai move reasons should be set by the semeai module. However this has not been implemented yet. One might also wish to list moves which increase the lead in a semeai race (removes ko threats) for use as secondary move reasons. Analogously if we are behind in the race.