Open Side Menu Go to the Top
FAQ Today's Posts Search Twitter Discord
Register
Bearing off against contact position Bearing off against contact position
Post Reply Subscribe
...
06-27-2018 , 08:30 PM
#1
grape5
View Profile Send Message Find Posts By grape5 Find Threads By grape5
newbie
Join Date: Dec 2017 Posts: 39
White - Pips 121 (+46)

Black - Pips 75 (-46)
Black to Play 5-3
Created with Diagram Builder

Spoiler:

According to an XG rollout, 7/4 6/1* is slightly better than the obvious 6/1* 4/1. It sort of makes sense - if White enters and hits, it will be on the 1-point where it's difficult to get out, and Black could collect a second checker on the return shot. If White doesn't hit, then it will be covered quickly. Would anyone find this play OTB?

Code:
    1. Rollout¹    7/4 6/1*                     eq:+1.165
      Player:   90.99% (G:36.39% B:1.79%)
      Opponent: 9.01% (G:0.25% B:0.00%)
      Confidence: ±0.007 (+1.157..+1.172) - [100.0%]
      Duration: 4.7 seconds

    2. Rollout¹    6/1* 4/1                     eq:+1.107 (-0.058)
      Player:   89.35% (G:35.39% B:1.14%)
      Opponent: 10.65% (G:0.17% B:0.00%)
      Confidence: ±0.007 (+1.099..+1.114) - [0.0%]
      Duration: 4.2 seconds

    3. 1-ply       6/3 6/1*                     eq:+0.536 (-0.629)
      Player:   71.89% (G:22.23% B:1.15%)
      Opponent: 28.11% (G:3.68% B:0.02%)


¹  1296 Games rolled with Variance Reduction.
   Moves: 2-ply, cube decisions: 3-ply Red
eXtreme Gammon Version: 2.10
Bearing off against contact position Quote
06-28-2018 , 08:45 AM
#2
bleep69
View Profile Send Message Find Posts By bleep69 Find Threads By bleep69
grinder
Join Date: Sep 2008 Posts: 483
I see the logic, but very much doubt I would have found the play, or had the courage to follow through with it if I had found it.
Bearing off against contact position Quote
06-28-2018 , 09:23 AM
#3
Robertie
View Profile Send Message Find Posts By Robertie Find Threads By Robertie
old hand
Join Date: May 2004 Posts: 1,954
Since 6/1* is forced, I think a lot of players would see the two plays. Both win lots of gammons but in different ways, and both have a few bad numbers coming up. I think over the board for money I'd make the ace-point, because my experience is that straightforward plays are a little more likely to be right. In a match where I was trailing and really needed a gammon, I'd probably lean toward the fancy play.
Bearing off against contact position Quote
06-28-2018 , 11:46 AM
#4
_Z_'s Avatar
_Z_
View Profile Send Message Find Posts By _Z_ Find Threads By _Z_
adept
Join Date: Jul 2004 Posts: 720
It's easier to find the play if you realize that White should choose not to hit with 2-1 if Black plays 7/4 6/1*. Doesn't tell the whole story because White would rather roll a 1 than dance probably, but combine that with the fact that 7/4 6/1* is better/more flexible than making the ace when White dances with 6-6 or enters with 2-4, say.
Bearing off against contact position Quote
Post Reply Subscribe
...
      
Feedback is used for internal purposes. LEARN MORE
Contact Us Privacy Statement TOS
Top
Powered by:  Hand2Note
Copyright ©2008-2022, Hand2Note Interactive LTD
m