I got off to a low club lead and declarer managed to run home with nine tricks (1♣, 3♠, 2♥. 3♦). We lose 10 imps.
Here we get off to the ♣A lead, partner plays the ♣4 (UDCA), then we shift to heart. This time, instead of winning 10 imps (4♣ plus 1♥) we lose 1 imp to 4♠ making four (they make 3nt via 5♠, 3♦ and a ♥.