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RR9 - Board 8
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I found the club combination on this layout interesting.

Taking the auction from the USA1 (EW) vs USA2 match

West
K43
AQ108
J6
Q643
East
A85
J964
K75
A105
W
N
E
S
1
P
1
P
2
P
2NT
P
3
P
3NT
P
4
P
P
P

4 will need almost surely need the K and A favorably placed, then declarer must navigate the clubs for 1 loser (or 2 tricks).

The first few tricks go according to plan.

West
K43
AQ108
J6
Q643
North
East
A85
J964
K75
A105
South
W
N
E
S
1
P
1
P
2
P
2NT
P
3
P
3NT
P
4
P
P
P
D
4 East
NS: 0 EW: 0
10
J
A
5
1
1
0
3
K
2
6
2
1
1
9
2
8
3
2
1
2
4
5
Q
7
0
1
3
A
8
6
K
0
1
4
5

So far so good, now declarer just needs a 2nd club trick. In isolation, the % play in the club suit is low to the Q and low to the T succeeding when either honor is onside. However, the defensive tempo has left us an alternative as we can lose 2 club tricks, so long as we establish a 2nd one for ourselves to shed the spade loser. 

What is the best line to accomplish that goal?

The exact odds are tough to calculate (at least for me at the table). It's easy to succeed looking at all 4 hands but my 1st thought when reaching the above position was to lead a club to the ace, ruff a diamond, and lead another club towards the T planning to duck. This picks up 3-3 clubs, any singleton or doubleton honor, and any king onside roughly .... very good odds (online calc says roughly 85.5). There is a little vigorish when RHO has KJxx(x) and I can maybe get a read on the 2nd club (100% line if i can). Declarer embarked on essentially that line by ducking 1st club then ace and another and found this layout.

 

West
K43
AQ108
J6
Q643
North
J962
73
A83
KJ82
East
A85
J964
K75
A105
South
Q107
K52
Q10942
97
W
N
E
S
1
P
1
P
2
P
2NT
P
3
P
3NT
P
4
P
P
P
D
4 East
NS: 0 EW: 0

Unlucky to be sure. Note that if the defense leads/shifts to spades early, it restricts declarer's options and steers them back to the double finesse position.

PS

A review of the vugraph results shows most declarers in 4 leading a to the T which does looks better %-wise (low 90s)

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