Worst Field Performance?

Sectional Open Pairs
Matchpoints

Occasionally, you are expecting a normal result on a board, and instead get a much better or worse result. This one is the biggest head-scratcher I've ever seen.


S A Q J 4 3
H 7 2
D K 7
C A K 7 6
S 10 9 6 2
H A K 6
D 6 5 3
C J 8 4 		[W - E] S 5
H Q J 10 9
D J 10 9 4 2
C Q 9 3
None Vul S K 8 7
H 8 5 4 3
D A Q 8
C 10 5 2


Dad
West
Pass
Pass
All Pass

North
1 S
3 C
Me
East
Pass
Pass

South
2 S
3 S

3 S by North
Made 4 — NS +170 — NS 68.75%

N-S missed a cold game and got a 70% board because 5 out of the 8 N-S pairs are -50. Your goal - figure out a way this could possibly have happened.