Opponent’s options: VANdAL 5a (10) (out play), NAVAL i11 (14), ViA 14j (18)
Candidate choices: TAG 5d (7), GETA 5b (5), EX a14 (28), EXALT i10 (28)

In Puzzle 6, your opponent only has one out play, but it is not worth blocking them.  Instead, you should plow forward and play EXALT, outscoring their out play.  If your opponent plays VAs/EXALTs, you can go out by playing TEG d8 (17) and win easily.