semelis: In real game endgame sente is usually worth at least 1 point.
If the problems are to train and improve real game ability, sente is important IMO.
Behair: This is wrong. If the objective is only to maximize the number of points independently of sente/gote, the correct answer for W is P2, which is 1 pont better than proposed here (Q2).
TheStudent: To decide between P18 or Q18 the question should be more specific: "keep sente" or "sente is not important".
I suggest to split this problem in two distinct problems!
Farkas: In endgame-type problems, sente is NOT a factor. You just must to reduce your opponent's points as much as you can.
In real game endgame sente is usually worth at least 1 point. If the problems are to train and improve real game ability, sente is important IMO.