Scoring: MP
Opps silent, GIB tries:
1♥-2♣;
2♥-2♠;
3♥-4♣;
4♠-5♣;
5♥???
5♣ was the last making game, 4♥ also makes. (partner is 4-0-2-7, opps have all the diamonds).
Should perhaps the definitions of 4cl/5cl be constrained with more clubs, fewer hearts so that GIB can realize that 5♥ isn't such a great idea?

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