I presume GIB simulated after my 3♥ signoff to bid 4♥. I think he should be programmed to never simulate after pard has declined an invitation. In addition, the description of 3♥ should probably be "2-5C; 2-5D; 3-4H; 2-4S; 15-16HCP; 15-16 total points" rather than what is currently shown.
Similarly, if pard chooses a game after GIB has accurately described his hand, the auction should also end.
Again, if preventing simulations is not to be implemented, then having a better description of the 3N bid might at least yield better simulations. I'd suggest "3-5C; 3-5D; 2-3H; 2-3S; 16-17HCP; 17-18 total points" instead of the current description, which allows for the possibility that South has suppressed a serious major-suit fit.

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