The natural way

You don’t see many artificial bids when a French pair is control of an auction, and the following from the Senior International Cup match between France and Belgium is a good example.

Board 7. Dealer South. All Vul.
	ª A K 9 4 © 9 6 2 ¨ K 10 5 2 § K 6
ª J 10 8 7 3 2 © - ¨ 8 6 3 § 10 9 8 4		ª Q 5 © Q J 8 7 5 3 ¨ Q J 7 4 § 7
	ª 6 © A K 10 4 ¨ A 9 § A Q J 5 3 2

West	North	East	South
Busquin	Mari	Henri	Chemla
			1§
Pass	1¨	Pass	2©
Pass	2ª	Pass	3§
Pass	4§	Pass	4¨
Pass	4ª	Pass	4NT
Pass	5©	Pass	5NT
Pass	6©	Pass	7§
All Pass

The French champions Paul Chemla and Christian Mari conducted a natural auction: 2© was game forcing, 4§ set the trump suit, followed by cuebids of 4¨ and 4ª.

Good bidding is not a guarantee of trick taking, however, and some skill was required for this deail
The opening lead was not reported, but it was likely a club or a spade. Chemla drew trumps and took the precaution of cashing two high spades and ruffing a third, which might have been necessary to isolate the menace for a double squeeze (in case diamonds were guarded by both sides).

As you can see, that was not necessary, and when Chemla played the last trump from his hand, East could not stand the pressure and had to surrender the 13th trick in one of the red suits.

Plus 2140 was good for a16-IMP swing for France.