Posted 2023-March-18, 10:20
Partner's bid is a bit weird. Why not 2♠ first if 16-17, and pass now with 15-?
Assuming partner has a modest 16-count with four spades, pass could be right at IMPs where 2♠ may be the last making contract but I would bid 3♥ at MP as 140 is more than 110.
There's also the issue that 2♠ is a weird bid so it might not even be natural. Some kind of trial bid with six hearts is maybe the most logical meaning. In which case pass would look silly.
It looks like there was a system misunderstanding regarding splinters. These AIs get more human every year --- Gilithin