bgm, on 2013-May-28, 16:17, said:
Ignoring possible trump promotions
When 3-2 break you are losing 2 ♠ tricks by playing ♠ KJT
When 5-0 break or 4-1 break with AQ9x - x, you are losing 3 ♠ tricks to ♠ AQ9
When 4-1 break
with singleton A: play small on first round
with singleton Q: play K on first round
with singleton 9: play K, J, or T on first round
Therefore you should play K on first round.
since we do not have any bidding that might give us a clue which opp holds the
trump ace the above approach is best under all circumstances