Opponent’s options: JOLTED b1 (46), JOLTER i3 (22)
Scoring options: WIVERN n10 (40), EARWIG a8 (33)
In Puzzle 20, you can win the game by playing WAUR 4a (11). This sets up WIVER a4 next turn, a play that is difficult for your opponent to block effectively without giving you a good counterplay. Any play that uses the J gives you JIVER, and as a back up play you have DIVER next turn.