[uva72uva72]

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IMPS, ACBL robot individual

If you opened this hand 1♦ and rebid 3♦, showing 17-HCP and 17-20 total points, according to the system notes, the North robot took you to slam.

If you opened this hand 1NT, showing 15-17 HCP, the robot eventually raised your 3NT to 4NT (showing 16-17 HCP!) and you probably got to slam.

My auction, according to the system notes, showed 21-HCP and 18-22 total points, promising the most strength of any of these auctions. The robot did not even invite, and 12 IMPs got flushed. I don't mind losing the IMPs to the player who opened 2♣ since that person showed even more strength than I did and took the risk of getting overboard. But conceding IMPs to those who showed weaker hands is extremely difficult to swallow.

[cloa513]

Its absurdly wide range for 2♠- It should be not more than 7-10 with 11-13 HCP it should bid 4NT. Strong force in diamonds- 4♦.

[Bbradley62]

cloa513, on 2015-January-15, 02:06, said:

Its absurdly wide range for 2♠- It should be not more than 7-10 with 11-13 HCP it should bid 4NT. Strong force in diamonds- 4♦.

Why not 3♣ over 2♥?

[Stephen Tu]

I think the range for 2♠ is totally fine. It's a fairly common style to play 2♠ as forcing 1 round, any strength holding 5+ spades (but unsuited for 3 spades, which should be something like 6+sp, 10+ pts), so 6+ pts. It shouldn't be "forcing to 3nt" though, just forcing to 2nt.

What is wrong IMO is:
1. Range for 3d, it's 18-22? I think this should be NF and limited, something like 17-18, 17-19 TP. It should be same range as jump rebidding diamonds without reversing, NF, it's essentially showing the same strength hand but without 4 hearts. With this hand I personally rebid 3nt. Or strong hand with say A of H but not the A of C should bid say 3♣ looking for a club stopper.

2. I'd venture to guess that 4nt is something silly like RKC for diamonds? So even though North hand is out of range for 3nt, it has no good bid? Probably 4nt should be natural and 4d be forcing for hands that want to RKC D. Though 3nt would be plenty if 3d were limited as I would prefer. If 3♦ is going to be such wide range and forcing, then the 3nt bid has to have a tighter range.

[olegru]

uva72uva72, on 2015-January-15, 01:44, said:

If you opened this hand 1♦ and rebid 3♦, showing 17-HCP and 17-20 total points, according to the system notes, the North robot took you to slam.

If you opened this hand 1NT, showing 15-17 HCP, the robot eventually raised your 3NT to 4NT (showing 16-17 HCP!) and you probably got to slam.

My auction, according to the system notes, showed 21-HCP and 18-22 total points, promising the most strength of any of these auctions.

This board actual was much more fun:
Somebody (instead of revers bid 2♥) jump to 5♦ on the second round. According the bid description, GIB took it as "11-21 HCP, biddable ♦" (not even rebiddable) and corrected to 5 ♠ with cute description "5+ ♠ 6+ points." After player return to 6♦, GIB suddenly reevaluate hand as 14+ points and bid 7♦!

Somebody else jumped on the second round all the way to 6♦. This time GIB decided that suit is rebiddable, but did not bid 7.

Another person (as a number other players) started with jump to only 3♦, but after 3♠ from GIB bid 5♦ (instead of 3NT, chosen by lucky competitors). Now GIB evaluate its hand as 16+ points and bid 7 ♦.

One more person started with revers 2♥, but instead of 3♦ on the second round jumped to 3NT and GIB jumped to 6NT. I thought GIB treats revers as a GF and 3NT clearly not stronger 3♦.

There were even more funny board, but actions of GIB there at least have some explanation.