|7-1||(N) 1D - 1S - 2S - 4S||South||CJ by W||10 tricks||no||4 x 30 + 300 = 420|
|7-2||(E) 1C - 1S - 2S - 4S||West||H3 by N||10 tricks||no||4 x 30 + 300 = 420|
|7-3||(S) 1S - 2D - 5D||North||HJ by E||11 tricks||no||5 x 20 + 300 = 400|
|7-4||(W) 1C - 1H - 2H - 4H||East||HK by S||10 tricks||yes||4 x 30 + 500 = 620|
|7-5||(N) 1C - 1H - 1S - 3S - 4S||North||DQ by E||10 tricks *||yes||4 x 30 + 500 = 620|
|7-6||(S) 1H - 4H - Pass||South||SQ by W||11 tricks *||no||5 x 30 + 300 = 450|
|7-7||(W) 1S - 1NT - 2H - 4H||West||CQ by N||11 tricks *||yes||5 x 30 + 500 = 650|
|7-8||(W) 1D - 1S - 2S - 4S||East||DK by S||11 tricks *||no||5 x 30 + 300 = 450|
|7-9||(N) 1D - 1S - 2S - 4S||South||DQ by W||11 tricks *||no||5 x 30 + 300 = 450|
|7-10||(W) 1D - 1S - 1NT - 2S||East||DK by S||9 tricks||yes||3 x 30 + 50 = 140|
|7-11||(S) 1C - 1H - 1S - 3NT||North||C6 by E||10 tricks||yes||40 + 3 x 30 + 300 = 430|
|7-12||(W) 1C - 1H - 1S - 6S||West||HQ by N *||12 tricks||no||6 x 30 + 800 = 980|
Deal 7-5 : If If Declarer ruffs 2 rounds of Hearts in Dummy with high trumps BEFORE drawing all enemy trumps he will make 11 tricks (and 650 pts). See also my comment on the bidding.
Deal 7-6 : Declarer here plays a cross ruff game. He first cashes in the three Aces. Then he proceeds by alternating ruffing his Diamonds in Dummy and ruffing Dummy's Spades in his own hand, making 11 tricks.
Deal 7-7 : Like Deal 7-6 also a cross ruff game. Always make sure to cash you winning Aces (and Kings if you have them) before you do the cross ruffing, otherwise opponents may discard their small cards in the side suits and trump your high cards at the end.
Deal 7-8 : Draw 2 rounds of trumps only and cash your Aces and Kings in Clubs and Hearts. Then cross ruff your remaining small cards in Clubs and Diamond. North will eventually over ruff with his Queen, but there is nothing he can do to stop you making 11 tricks.
Deal 7-9 : Before drawing trumps Declarer should play three rounds of Clubs, discarding a small Heart loser from Dummy on the 3rd trick. This way he makes 11 tricks.
Deal 7-12 : Leading a bare Ace in Slam contract generally only makes life easier for the Declarer. North should make the aggressive Heart Queen lead in the hope of setting up the Heart 10 as a second winner.