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North deals at unfavorable vulnerability, and the bidding goes
P - P - 4♣ - dbl
P - 4♦ - All pass
I forgot to look at the vulnerability before opening, but that doesn't really matter much here.
South leads the ten of spades and north ducks his ace!
4 diamonds promptly makes.
After south shows 7+ clubs, wouldn't it be reasonable for the robot to play partner's lead as a singleton? Also, even if the spade is doubleton, north has a potential entry in trumps to give south a ruff later if east has 4♦s.
Also, shouldn't east bid 4♠ instead of 4♦?
Scoring is IMPs.