Why redouble?

[Bbradley62]

[hv=lin=pn|devarajan,~~M41878,~~M41876,~~M41877|st%7C%7Cmd%7C4SJQAH8JAD257C89KA%2CS2H57TKD689JQAC45%2CS45TKH236D4TC237Q%2C%7Crh%7C%7Cah%7CBoard%202%7Csv%7Cn%7Cmb%7Cp%7Cmb%7C2N%7Can%7CTwo%20NT%20opener.%20Could%20have%205M.%20--%202-5%20C%3B%20%7Cmb%7Cp%7Cmb%7C3C%7Can%7CStayman%20--%205%2B%20total%20points%20%7Cmb%7Cp%7Cmb%7C3D%7Can%7CNo%20major%20suits%20--%202-5%20C%3B%202-5%20D%3B%202-3%20H%3B%202%7Cmb%7Cd%7Can%7C6%2B%20HCP%3B%20rebiddable%20D%3B%207%2B%208421%20HCP%20in%20D%3B%2020-%20total%20points%20%7Cmb%7Cr%7Can%7C9%2B%20total%20points%20%7Cmb%7Cp%7Cmb%7C3N%7Can%7C2-5%20C%3B%202-5%20D%3B%202-3%20H%3B%202-3%20S%3B%2020-21%20HCP%7Cmb%7Cp%7Cmb%7Cp%7Cmb%7Cp%7Cpc%7CDQ%7Cpc%7CD4%7Cpc%7CD3%7Cpc%7CD2%7Cpc%7CS2%7Cpc%7CS4%7Cpc%7CS3%7Cpc%7CSA%7Cpc%7CCA%7Cpc%7CC4%7Cpc%7CC2%7Cpc%7CC6%7Cpc%7CC9%7Cpc%7CC5%7Cpc%7CCQ%7Cpc%7CCT%7Cpc%7CS5%7Cpc%7CS6%7Cpc%7CSQ%7Cpc%7CH7%7Cpc%7CSJ%7Cpc%7CD9%7Cpc%7CSK%7Cpc%7CS8%7Cpc%7CST%7Cpc%7CS9%7Cpc%7CD5%7Cpc%7CD6%7Cpc%7CC3%7Cpc%7CCJ%7Cpc%7CCK%7Cpc%7CD8%7Cpc%7CC8%7Cpc%7CH5%7Cpc%7CC7%7Cpc%7CH4%7Cpc%7CHA%7Cpc%7CHT%7Cpc%7CH2%7Cpc%7CH9%7Cpc%7CD7%7Cpc%7CDJ%7Cpc%7CDT%7Cpc%7CDK%7Cpc%7CS7%7Cpc%7CH8%7Cpc%7CDA%7Cpc%7CH3%7Cpc%7CHQ%7Cpc%7CHJ%7Cpc%7CHK%7Cpc%7CH6%7C]360|270[/hv]North GIB doesn't have 9+ total points...

[lipeng2076]

yes，a bug

[pigpenz]

the explanation may not be fully correct but is it really a bug?

N/S do have game values so the requirements after partner shows 20+

should be a little more lax, if anything the problem is

how many diamonds does pass,3NT, and redouble show

 

[hv=pc=n&n=skt54hkq2dt4cqj32]133|100[/hv]

give north this hand and where does it want to go