A jettison, a beercard threat, a show-up squeeze

I opened a 10-12 Notrump as North and became declarer when partner put me in SIX NOTRUMP. The lead was the TEN OF DIAMONDS. This was covered Knave, Queen, and I won in hand. I marked time by cashing four rounds of hearts with no clear clues. After the spade finesse was proven, I unblocked in spades, and played a small club toward dummy's Jx.
Either my LHO (E) would need to have a doubleton honor, or RHO would need to have both, and I was confident I could guess the ending. The Jack lost to RHO's Queen. LHO actually played out of tempo, so I still didn't know the position with confidence. However, in the four card ending, the high heart was in my hand. Since I did not want to commit to the club finesse so early, I cashed the high spade, JETTISONING my Knave of hearts. I then cashed the 5 of hearts, with the BEER CARD the SEVEN OF DIAMONDS as the threat in the show up squeeze. In the two card ending, my RHO had to keep the EIGHT OF DIAMONDS and come down to the stiff KING OF CLUBS. It was rewarding to see the King of clubs popup in the show up squeeze on trick twelve.
A 100% board.
I did not realize the full potential of AT9. A mere double finesse guarantees the contract as long as both club honors are offside, making 75% of the time, and representing a better chance. Thanks to Ian Weinstock for pointing this out.