The second slam from yesterday's Surrey Schools Cup was bid at one table by Joe Benton and Max Fleming from St. Pauls.
Correct bidding using Acol would begin:
Note there is no need to use Blackwood 4NT. "Never Use Blackwood with a void" is exemplified here - one South used RKCB - Roman Key-card Blackwood, where the King of trumps is counted as the fifth ace. The response of 5D (showing 1 or 4 out of the five aces) left South uncertain whether the 'ace' in question was the King of trumps (vital) or the Ace of diamonds (less useful).
There are in fact 13 tricks available owing to a fortunate distribution in the diamond suit. If Diamonds can be trumped 3 times the Ace and Queen will fall, leaving dummy with two winners to dispose of the club losers. There is one spade loser in the South hand which can be trumped in dummy. Careful timing is required as you have to trump diamonds three times and then return to dummy to enjoy the established diamonds once trumps are drawn. Four entries are needed: Three trumps and the King of spades.
Win the trump lead (safest) with dummy's Jack, trump a diamond, cross back to dummy's King of hearts, and trump another diamond with West's Queen falling. Cross to the king of spades and trump a third diamond, establishing two winners as West's Ace falls. Trump the Jack of spades with dummy's 4 of hearts and play the winning diamonds, throwing clubs. The South hand is now good. 13 tricks - not a grand slam I'd want to be anywhere near as it requires a miracle lie in diamonds.
"Two over One" bidding
One core principle of the two over one bidding system as played by most experts is that a new suit response at the two-level is 100% game-forcing, thereby allowing more bidding space.
One heart promises 5 cards. The 2D response is game-forcing, promising 12+ points and 4+ diamonds. The 2H rebid is unlimited. The 4H bid seems simple but in fact shows a minimum hand given the context of his 2D game-force. North being aceless and with a weak singleton king uses the "Principle of Fast Arrival" to show his lack of interest in slam. PFA is simple. If you are in a game-forcing situation, bidding straight to game is weaker than bidding slowly. So a 3 Heart bid by North (instead of 4H) would show some slam interest and invirte cue-bidding.
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