[Natali_]

Natali_ = Xbabarx

[barmar]

Barmar - xbabarx

9.5 - 6.5

My only win, and I have just one more match to play. I don't have a good feeling about advancing...

[smerriman]

 Natali_, on 2022-August-09, 02:50, said:

https://www.bridgeba...HT%7Cpc%7CH5%7C
Can someone explain how the robot chose the move here? Thanks

Which part in particular were you wondering about?

[Natali_]

First move

[smerriman]

 Natali_, on 2022-August-11, 02:07, said:

First move

Spoiler

If you mean why did it lead the ♥2 instead of the ♥9, it always leads low from three small even in NT for some reason. Just the way it's programmed.

If you mean why didn't it lead a club, a club is very unlikely to work well at MPs - it'll be great if it finds AKx or maybe four clubs opposite, but otherwise you can never get more than 2 club tricks, and there are many holdings where it will give away an extra overtrick.

Comparing club and heart over 100 simulated hands:

- in 11 cases, the contract is going down on both leads, and there's no difference
- in 7 cases, a club beats the contract when a heart doesn't
- in 4 cases, a heart beats the contact when a club doesn't

But most importantly, in the other 78 cases where the contract is always making.. on 53 of these both leads are equal, but a heart is better on 19 occasions, and a club only better on 6 occasions.

Eg:

---

GIB almost always leads passively to avoid giving away extra tricks like this. (Spade was about the same result, both scoring better than a club.)

Bird & Anthias cover lots of cases like these in their book.

[ye17]

ye17 6.5 - 9.5 diana_eva
https://webutil.brid...b=web&v3v=6.3.8

ye17 9.5 - 6.5 crazy4hoop
https://webutil.brid...b=web&v3v=6.3.8

ye17 8.5 - 7.5 shuba
https://webutil.brid...b=web&v3v=6.3.8

[sakuragi]

sakuragi 10.5
sep123 5.5
https://webutil.brid...b=web&v3v=6.3.8

[Muddylane]

Muddylane 10 v Tim- ucin 6

https://webutil.brid...&v3v=6.3.4#row-

[Muddylane]

Muddylane 10 v Tim- ucin 6

https://webutil.brid...&v3v=6.3.4#row-

[mlbridge]

Mlbridge (9) / Toast1 (7)

https://webutil.brid...b=web&v3v=6.3.8

Mlbridge (8.5) / Billyfung2 (7.5)

https://webutil.brid...b=web&v3v=6.3.8

Mlbridge (9.5) / Stephen Tu (6.5)

https://webutil.brid...b=web&v3v=6.3.8

[mlbridge]

Mlbridge (5.5) / Cherdano (10.5)

https://webutil.brid...b=web&v3v=6.3.8

Mlbridge (9) / Barmar (7)

https://webutil.brid...b=web&v3v=6.3.8

Mlbridge (9.5) / Hrothgar (6.5)

https://webutil.brid...b=web&v3v=6.3.8

[Natali_]

Natali_43.75%/ Hrothgar

[diana_eva]

diana_eva vs tim_ucin: 8.5 - 7.5

https://webutil.brid...aeb4-1660121423

[smerriman]

https://webutil.brid...b=web&v3v=6.3.8
smerriman 10 - 6 Povratnik

[cherdano]

ALERT!
cherdano - barmar: Barry accidentally sent, and I accidentally accepted, an 8-board challenge. We agreed to play it as two separate challenges of 8 boards each.
First: Unfortunately, I cannot access the detailed results any more. Results was 5.5-2.5

Second: https://webutil.brid...b=web&v3v=6.3.8 4.5-3.5
Total: 10-6

[cherdano]

cherdano-hrothgar 10.5-5.5 https://webutil.brid...b=web&v3v=6.3.8

cherdano - billyfung2 6.5-9.5 https://webutil.brid...b=web&v3v=6.3.8

cherdano - stephen_tu 10-6 https://webutil.brid...b=web&v3v=6.3.8

[shuba]

https://webutil.brid...&v3v=6.3.8#row-

Shuba / Muddylane 59,38/

[crazy4hoop]

crazy4hoop - diana_eva
6 - 10
https://webutil.brid...b=web&v3v=6.3.8

[bgm]

BGM 11 : 5 povratnik

https://webutil.brid...&v3v=6.3.8#row-

[xbabarx]

Challenge: Stephen Tu / Xbabarx
https://webutil.brid...b=web&v3v=6.3.8
xbabarx: 50%