Demonstration, Part 3

Demonstration, Part 3

N
W   E
 
S
K 8 6 5
A 9 7 3
Q 8 5
6 5

Dealer:

West

W N E S
1 1 1 3
Pass Pass ?

Look what happens if we respond 1 on the first round.

We must pass 3. We are not strong enough for anything else, and have no known fit with partner.

Afterwards we discover that we had a spade fit. What went wrong?