Waterloo for Napoleon, according to Victor Hugo's legend, might have meant glorious victory instead of total defeat if his maps had disclosed the gulley that swallowed the flower of his cavalry—a sunken road meandering across the battlefield. The road broke the charge before it reached Wellington's famous squares.
As I see it, the major "accomplishment" of so-called scientific bidding is to insure that the opponents will know as much as possible about declarer's hand before they are called upon to mount their counterattack.
In the current deal, for example, South furnished a clear warning that should have served as a blueprint for the defense. The reason it failed was that apparently West did not know how to read a road map.
East played the deuce of hearts on the first trick and South's jack warned of his singleton. Nevertheless, West continued by leading the queen of hearts and South ruffed. Declarer played the ace of trumps and when West showed out, the play of the hand became an open book.
Dummy's club 10 was thrown under South's ace. Declarer then led a spade to dummy. After discarding his little diamond on a second round of spades, dummy's club 3 was led through East for a finesse against the jack. Picking up East's trumps, declarer showed his hand, conceding a trick to the ace of diamonds and chalking up the game and rubber.
West's defense was considerably less potent than it might have been though South had furnished West with a complete guide. Clearly, South must have a great club suit, proof against anything but the bad break which West knew about but which South could scarcely foresee until he had led one round of trumps.
A heart continuation was scarcely likely to embarrass the kind of trump suit South must hold. A diamond lead would be into the teeth of his bid suit. The situation cried for a shift to spades.
No matter what spades declarer held, a spade lead could not help him, but it might have the advantage of robbing dummy of a much-needed later entry.
That is exactly what would have happened. Dummy would win two high spades, permitting declarer to discard his little diamond. Then a trump would be led—and South, who had no reason to foresee the 4-0 distribution, would be entirely correct to play for the adverse trumps to fall in three leads.
Once he played a high card on the first trump lead, the contract would be gone beyond recall. With no way to get back to dummy, declarer would have to lose a trump in addition to a heart and a diamond.