Double attack:
Black moves archer at B5 to B4, and simultaneously attacks the white warrior at B3 and the white power magician at C3.
One must fall, because both can't move out of the way at once, nor can either capture the archer, double protected by archer at A5 and warrior at A6.
Skewer:
White moves the bondsman to E4 above and skewers the black magician at F5 and the black assassin at G6. If black moves the magician, the assassin falls to the bondsman. If black leaves the magician, the bondsman captures it on the next move. An impossible scenario, as there is no black piece in range to protect the magician.
Sacrifices:
Giving up a piece to gain a positional advantage or a win, is a powerful tactic.
Below, black has only to capture the white archer at D2 to win:
If white recaptures F1-> D2, black answers by pushing D5 -> D2 and wins the game, as the white khan-archer at E2 has limited mobility (1 square in each direction), and cannot escape the Bondsman's attack swath. White loses.