Unnecessary cue bid?

[Bbradley62]

[hv=lin=pn|human,~~M21745,~~M21743,~~M21744|st%7C%7Cmd%7C4S2389HKAD6QC23TJQ%2CS7TH235JQD58TJKC6%2CS56QKH69D2C5789KA%2C%7Crh%7C%7Cah%7CBoard%202%7Csv%7Cn%7Cmb%7Cp%7Cmb%7C1C%7Can%7CMinor%20suit%20opening%20--%203%2B%20C%3B%2011-21%20HCP%3B%2012-22%20total%20points%7Cmb%7Cp%7Cmb%7C1S%7Can%7COne%20over%20one%20--%204%2B%20S%3B%206%2B%20total%20points%20%7Cmb%7Cp%7Cmb%7C3S%7Can%7CJump%20raise%20--%203%2B%20C%3B%204%2B%20S%3B%2016-18%20total%20points%7Cmb%7Cp%7Cmb%7C4C%7Can%7CHelp-suit%20slam%20try%20--%203%2B%20C%3B%204%2B%20S%3B%202-11%208421%20HCP%20in%20C%3B%2015%2B%20total%20points%20%7Cmb%7Cp%7Cmb%7C4S%7Can%7C3%2B%20C%3B%204%2B%20S%3B%2016-18%20total%20points%7Cmb%7Cp%7Cmb%7C5C%7Can%7CCue%20bid%20--%203%2B%20C%3B%204%2B%20S%3B%208-11%208421%20HCP%20in%20C%3B%2017%2B%20total%20points%3B%20forcing%20%7Cmb%7Cp%7Cmb%7Cp%7Cmb%7Cp%7Cpc%7CC6%7Cpc%7CC5%7Cpc%7CC4%7Cpc%7CCQ%7Cpc%7CCJ%7Cpc%7CH2%7Cpc%7CC7%7Cpc%7CD3%7Cpc%7CHA%7Cpc%7CH3%7Cpc%7CH6%7Cpc%7CH8%7Cpc%7CHK%7Cpc%7CH5%7Cpc%7CH9%7Cpc%7CHT%7Cpc%7CS2%7Cpc%7CS7%7Cpc%7CSK%7Cpc%7CSA%7Cpc%7CDA%7Cpc%7CD6%7Cpc%7CD5%7Cpc%7CD2%7Cpc%7CD7%7Cpc%7CDQ%7Cpc%7CD8%7Cpc%7CC8%7Cpc%7CC9%7Cpc%7CH7%7Cpc%7CCT%7Cpc%7CST%7Cpc%7CS9%7Cpc%7CHJ%7Cpc%7CSQ%7Cpc%7CS4%7Cpc%7CS5%7Cpc%7CSJ%7Cpc%7CS3%7Cpc%7CHQ%7Cpc%7CD9%7Cpc%7CC2%7Cpc%7CDK%7Cpc%7CS6%7Cpc%7CS8%7Cpc%7CDT%7Cpc%7CCK%7Cpc%7CD4%7Cpc%7CCA%7Cpc%7CH4%7Cpc%7CC3%7Cpc%7CDJ%7C]360|270[/hv]South doesn't have his 3♠ bid, and he shouldn't pass a cuebid, but... What's up with the 8-11 8421HCP explanations? And the 5♣ cue bid? Wouldn't this have been a good time for RKC?

[georgi]

Probably, but 4NT followed by 5♥ won't likely solve hearts losers danger. Could be ♦+♠.

 

5♣ looks like last try and if player bids 5♥, GIB would be happy to bid 6♥. And over 5♦ could bid 5♠ so still one more chance if opener has ♥+♦ to push once more.