[Lord Molyb]

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North ends up in 6♦ after the opening 2♣ - 2♦ - 3♦.
East leads a heart and north wins the queen, ducking the ace from dummy. It then ducks a spade, wins the heart return in dummy with the ace, ruffs a spade.
Here are the remaining cards:

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North then leads the jack of hearts! East ducks and dummy ruffs low!!!

[cloa513]

Lord Molyb, on 2013-March-21, 16:12, said:

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North ends up in 6♦ after the opening 2♣ - 2♦ - 3♦.
East leads a heart and north wins the queen, ducking the ace from dummy. It then ducks a spade, wins the heart return in dummy with the ace, ruffs a spade.
Here are the remaining cards:

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North then leads the jack of hearts! East ducks and dummy ruffs low!!!

As soon as GIB decides East has 4 heart then its stuffed. Dummy play is irrelevant- guaranteed to lose.

[Lord Molyb]

cloa513, on 2013-March-21, 17:43, said:

As soon as GIB decides East has 4 heart then its stuffed. Dummy play is irrelevant- guaranteed to lose.

Well, I suppose
It still should take the 68% line of simply leading a trump though, shouldn't it?
Also the play of the ♥65 from west suggests east has the 3, and since it leads 4th best (it led the 7), east should always have 5.
Oh yeah, and even if east had 4, he's marked with the king. Why ruff?

[cloa513]

Lord Molyb, on 2013-March-21, 17:45, said:

Well, I suppose
It still should take the 68% line of simply leading a trump though, shouldn't it?
Also the play of the ♥65 from west suggests east has the 3, and since it leads 4th best (it led the 7), east should always have 5.

It takes no information from the lead and the lead is often erratic so it has no idea.
Frankly that was way better than my GIB playing Solitaire Bridge so no hands link. The opponent GIB bid 1S and bid to 3NT, that opponent GIB lead a heart to the K♥ and his partner amazing lead a spade and GIB holding QJ9 put down the 9 and instant loss otherwise it was solid with one standard finesse.