How would you play this 6 slam after the 4 of Diamonds lead following the bidding as shown above ?
On seeing dummy and capturing South's singleton K, West thought "Oh well, one off. Two Aces to lose..." and was soon one down. A little more thought and he would have seen that the contract is unbeatable!
Q: Why did North not lead a Spade? Ans : He has not got any!
Q: Would South open a weak 2 with A,K and A? Ans: Maybe, but unlikely.
It looks very likely therefore that the Aces are split. A with North and A with South. West should lead a to the Jack in dummy. If North wins, win the return in hand and throw 8 and K on the K and Q You can then throw two Spades on the Ace an King of Hearts and cross ruff for 12 easy tricks.
If North ducks and the J wins, cross back to hand and lead K throwing 8 from dummy and play similarly to above. You lose only the A and chalk up your slam for +1370. You were the only pair to bid this "cold" slam as WEST. It would be minus 2 played by East when South Plays Ace and another spade for North to ruff and then play the Ace of clubs for -200.
It's a simple game.