Assertion: castle's silver | /r/AtLocation | same rank
Facets:
value: on 57
type: LOCATION
value: on 77
type: LOCATION
Source sentences:
text: Since the player's silvers are on the same rank on 57 and 77 (Black's castle), the two silvers are prone to be forked by the opponent's knight via a ...P-65 Px65 Nx65 sequence.