why do Robot keep silence?

[lycier]

[hv=sn=lycier&s=SAKJT6H964DQCAJ87&wn=机器人&w=SQ9HK7532DT532CKQ&nn=机器人&n=S8432HQTDJ96C9653&en=机器人&e=S75HAJ8DAK874CT42&d=n&v=o&b=1&a=P1D(Minor%20suit%20opening%20--%203+%20D%3B%2011-21%20HCP%3B%2012-22%20total%20points)1S(One-level%20overcall%20--%205+%20S%3B%208-17%20HCP%3B%209-19%20total%20points)D(Negative%20double%20--%204+%20H%3B%207+%20total%20points)P2D(5+%20D%3B%2011-15%20HCP%3B%2012+%20total%20points)D(Takeout%20double%20--%204+%20C%3B%205-%20D%3B%205-%20H%3B%205+%20S%3B%2017-%20HCP%3B%2014-19%20total%20points)3D(4+%20D%3B%204+%20H%3B%207-12%20total%20points)PPP&p=SAS9S2S7SKSQS8S5H4H7HQHADADQD5D6DKS6DTDJD8C7D2D9C3CTCACQH6H5HTHJD7H9D3C5C4C8CKC9HKS3H8SJH3S4C2STH2C6D4CJ]499|350[/hv]

 

Actually Robot had a chance to make jump bid 3♠ to show weak preemptive raise so as to grant partner a hope,why do Robot keep silence?

[georgi]

Initially

 

1♦ - 1♠ ( or major ) - X - 2♠ - -- 3+ ♠; 6-9 total points

3♠ - Unbalanced -- 4+ ♠; 5-7 total points

 

GIB's hand in that case has just 3TP, and it's not unbalanced, so cannot qualify with less TP under that rule as doesn't have singleton/void to compensate lack of points.

 

Later over 3♦ things are almost similar, as like bidding 2♠, so still some TP or shape is not enough.

 

Looking at only NS hands it seems like good -1 defense, but with Q and J in red suits confirmed by opps, North hand has neither entry, neither extras beside 4th trump.