Strange bid and explanation

[thorvald]

[hv=url=https://www.bridgebase.com/tools/handviewer.html?bbo=y&lin=pn%7CHuman%2CRobot%2CRobot%2CRobot%7Cst%7C%7Cmd%7C1ST8654HAJ98DK6CA5%2CSAKQ73HT52DQT97C4%2CS2H7DA85432CQT872%2CSJ9HKQ643DJCKJ963%7Csv%7C0%7Cah%7CBoard%2011%7Cmb%7C1S%7Can%7CMajor%20suit%20opening%20--%205%2B%20%21S%3B%2011-21%20HCP%3B%2012-22%20total%20points%7Cmb%7CP%7Cmb%7C1N%7Can%7CForcing%20one%20notrump%20--%203-%20%21S%3B%206%2B%20HCP%3B%2012-%20total%20points%7Cmb%7C2S%21%7Can%7CMichaels%20--%205%2B%20%21H%3B%209%2B%20total%20points%3B%20forcing%7Cmb%7CP%7Cmb%7C4S%7Can%7C16-%20total%20points%7Cmb%7CP%7Cmb%7C5H%7Can%7C5%2B%20%21H%3B%209%2B%20total%20points%7Cmb%7CP%7Cmb%7CP%7Cmb%7CP%7Cpc%7CCA%7Cpc%7CC4%7Cpc%7CC2%7Cpc%7CC9%7Cpc%7CD6%7Cpc%7CD7%7Cpc%7CDA%7Cpc%7CDJ%7Cpc%7CD8%7Cpc%7CH4%7Cpc%7CDK%7Cpc%7CDQ%7Cpc%7CHK%7Cpc%7CHA%7Cpc%7CH5%7Cpc%7CH7%7Cpc%7CS4%7Cpc%7CS3%7Cpc%7CS2%7Cpc%7CS9%7Cpc%7CHQ%7Cpc%7CH8%7Cpc%7CH2%7Cpc%7CD5%7Cpc%7CSJ%7Cpc%7CS5%7Cpc%7CSA%7Cpc%7CD2%7Cpc%7CSK%7Cpc%7CD3%7Cpc%7CC6%7Cpc%7CS6%7Cpc%7CSQ%7Cpc%7CD4%7Cpc%7CC3%7Cpc%7CS8%7Cpc%7CS7%7Cpc%7CCT%7Cpc%7CH6%7Cpc%7CST%7Cpc%7CCK%7Cpc%7CC5%7Cpc%7CD9%7Cpc%7CC8%7Cpc%7CCJ%7Cpc%7CHJ%7Cpc%7CDT%7Cpc%7CCQ%7Cpc%7CH9%7Cpc%7CHT%7Cpc%7CC7%7Cpc%7CH3%7C]399|300[/hv]

 

4♠ is just explained as less than 16 points, but assume it is a strong hand with ♥-support.

 

 

But even then it is a strange bid

[smerriman]

Nah, it has 3♠ as the strong heart raise, and 2NT then 3♥ as the heart invite. This has popped up in a previous thread somewhere and it only does it when holding heart support AND 5 spades. Not in the old database but most likely a clash with a rule where 2♠ is natural.