West decided to lead 4th best club from the total of 1 HCPs, the 3.
East could see 13 HCP in dummy, held 14 HCP and could have assumed South to
have at least 11 HCP for the opening bid and 1N rebid.
That meant that South had the K:
40 total HCP - 13 - 14 - 11 = 2 at most for West.
The 3 lead tended to show either
4 or 5 clubs.
South then had at least 3 clubs: 13total - dummy2 - East3 - WestAtMost5 = SouthAtLeast3
South could have won the opening lead and deducing that West could not have
an entry, could have switched to a heart.
East might also have considered doubling the 3N contract for a heart lead, dummy's
first bid suit.
West might have considered a heart lead anyway, given the lack of entries for
the meagre clubs.
East inserted the Q at trick
one hoping West's clubs included the T.
In that case, East when next in would win the A
and exit the 9 to West's established
clubs.
An astute declarer without the T
would have to allow the Q to
win.
How lousy a holding in a suit can one have for a 4th best lead?
A 4th best club lead against 3N promises at least the T?
The J?
With such a standard, West might have led the 8,
top of nothing, to clarify.
East would then have been more likely to at trick one win the A
and find a heart switch.