[goffster]

http://tinyurl.com/ljoslw5

In this bidding, GIB has been offered a choice of contracts.
4S or 3N. If opener has 5 spades, then the bid of 3N should
be a warning to not bid any further.

Yet, it persists with 4C as a cuebid with *3* card support and a
hand that is only a non-minimum if opener has a good spade suit
and a favorable heart situation.

[cloa513]

goffster, on 2015-April-01, 16:53, said:

http://tinyurl.com/ljoslw5

In this bidding, GIB has been offered a choice of contracts.
4S or 3N. If opener has 5 spades, then the bid of 3N should
be a warning to not bid any further.

Yet, it persists with 4C as a cuebid with *3* card support and a
hand that is only a non-minimum if opener has a good spade suit
and a favorable heart situation.

Its hand matches its description- I don't think the description is sensible but its seems designed to handle poor human bidding- you have no chance in 3NT with a sensible heart lead and follow- occasionally GIB is sensible in its leads and even follows to lead well- rarely its even deadly accurate. Your bid is 3 clubs- hopefully that means game invite with four spades. You really need to either fit the description for 3NT or have at least 2 and 1 1/2 covers in the red suits and preferably some support for clubs and 13HCP- say four low spades.