I just found out the answer, playing an instant acbl robot game. I opened 1nt, lho overcalled 3h. Partner had a decent hand with 6 spades. My robot partner passed 3h. Didn't bid 3s or 4s. At all the other boards, previously played, of course, the robot jumped to 4s, which made. I defended 3h, because my robot partner wouldn't bid over 3h. I got a zero on the board, costing me a first place in the game. So the robot version playing in your game may not be the same as in the earlier game that was played. It can lead to a very undeserved zero on a board. I suppose you might get a good board somewhere along the way... Anyway, there will be some injustices when you play the instant robot games.