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Outlier

This hand came up in an ACBL robot IMP game yesterday:

 

South
K52
QJ87
AQ984
6
W
N
E
S
1
P
2
3
P
?

 

What would you bid?

 

Two Souths passed.  Everyone else raised to four, which West doubled to end the auction. 

 

West
10
1094
1053
AKQJ83
North
QJ98763
K532
95
East
A4
A6
KJ762
10742
South
K52
QJ87
AQ984
6
W
N
E
S
1
P
2
3
P
4
X
P
P
P
D
4X North
NS: 0 EW: 0
A
7
4
2
2
0
1
6
8
9
K
1
1
1
J
A
2
10
2
1
2
2
6
J
5
0
1
3
10
5

 

When South passed, West balanced with four diamonds!  This was passed out at one table, down, of course.  The other South doubled it, but found a way to let the contract through, -710.

 

At twelve of the tables declaring four spades doubled, robot East started heart ace, heart.  Grabbed the first spade, put partner in with a club, and got a heart ruff.  Down one. 

 

Nice defense, and, in a human game, I would expect many declarers to make four spades.  And, indeed, there was one outlier (isn't there always).  One North finished +790.  

 

But these are robots.  Surely, if one robot would defend this way, wouldn't they all?

 

So, my question to you:  How did one pair of robots manage to botch up this defense?

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