1. Forum
  2. Usenet
  3. REC.GAMES.BACKGAMMON

  • Early 55

    From Timothy Chow@21:1/5 to All on Mon Nov 1 23:58:47 2021
    XGID=-aa---E-C-A-cDb--bae----AA:0:0:1:55:0:0:0:0:10

    X:Player 1 O:Player 2
    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O O O | | O X |
    | X O O | | O |
    | X | | O |
    | X | | O |
    | | X | O |
    | |BAR| |
    | | | X |
    | | | X |
    | O X | | X |
    | O X | | X |
    | O X X | | X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 165 O: 161 X-O: 0-0
    Cube: 1
    X to play 55

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From badgolferman@21:1/5 to Timothy Chow on Tue Nov 2 14:20:10 2021
    Timothy Chow wrote:

    XGID=-aa---E-C-A-cDb--bae----AA:0:0:1:55:0:0:0:0:10

    X:Player 1 O:Player 2
    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O O O | | O X |
    | X O O | | O |
    | X | | O |
    | X | | O |
    | | X | O |
    | |BAR| |
    | | | X |
    | | | X |
    | O X | | X |
    | O X | | X |
    | O X X | | X O O | +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 165 O: 161 X-O: 0-0
    Cube: 1
    X to play 55

    ---
    Tim Chow


    I'm sure this is a weak play but I would probably go Bar/10, 13/18. I
    don't see how hitting or making the 3-point is any better than making
    the 10-point anchor at this point.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From ah....Clem@21:1/5 to Timothy Chow on Tue Nov 2 15:17:25 2021
    On 11/1/2021 11:58 PM, Timothy Chow wrote:
    XGID=-aa---E-C-A-cDb--bae----AA:0:0:1:55:0:0:0:0:10

    X:Player 1   O:Player 2
    Score is X:0 O:0. Unlimited Game
     +13-14-15-16-17-18------19-20-21-22-23-24-+
     | X  O        O  O |   | O              X |
     | X  O        O    |   | O                |
     | X                |   | O                |
     | X                |   | O                |
     |                  | X | O                |
     |                  |BAR|                  |
     |                  |   | X                |
     |                  |   | X                |
     | O           X    |   | X                |
     | O           X    |   | X                |
     | O     X     X    |   | X           O  O |
     +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count  X: 165  O: 161 X-O: 0-0
    Cube: 1
    X to play 55



    These rolls are hard to get right. X will be ahead by about 15 pips
    after this play so I'm inclined to just play to win the race. After
    making the ten point I'll go for the quiet 13/8.

    Hitting on the ace, or making the three point look playable but I'll go
    for simple here.

    bar/10 13/8.



    --
    Ah....Clem
    The future is fun, the future is fair.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to All on Mon Nov 8 21:10:18 2021
    XGID=-aa---E-C-A-cDb--bae----AA:0:0:1:55:0:0:0:0:10

    X:Player 1 O:Player 2
    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O O O | | O X |
    | X O O | | O |
    | X | | O |
    | X | | O |
    | | X | O |
    | |BAR| |
    | | | X |
    | | | X |
    | O X | | X |
    | O X | | X |
    | O X X | | X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 165 O: 161 X-O: 0-0
    Cube: 1
    X to play 55

    I chose to point on the 1pt, but XG agrees with badgolferman
    and ah_clem that the running play bar/10 13/8 is better, at
    least for money (at gammon go, XG slightly prefers 13/8 6/1*(2)).

    1. Rollout¹ Bar/10 13/8 eq:+0.210
    Player: 55.02% (G:15.76% B:0.91%)
    Opponent: 44.98% (G:12.76% B:0.44%)
    Confidence: ±0.014 (+0.197..+0.224) - [100.0%]

    2. Rollout¹ Bar/20 13/8 6/1*(2) eq:+0.130 (-0.081)
    Player: 51.84% (G:20.15% B:0.69%)
    Opponent: 48.16% (G:12.95% B:0.64%)
    Confidence: ±0.017 (+0.113..+0.146) - [0.0%]

    3. Rollout¹ Bar/15 6/1*(2) eq:+0.127 (-0.084)
    Player: 52.23% (G:18.03% B:0.75%)
    Opponent: 47.77% (G:13.75% B:0.66%)
    Confidence: ±0.014 (+0.112..+0.141) - [0.0%]

    4. Rollout¹ Bar/10 6/1* eq:+0.103 (-0.107)
    Player: 52.63% (G:14.37% B:0.64%)
    Opponent: 47.37% (G:13.70% B:0.54%)
    Confidence: ±0.016 (+0.087..+0.120) - [0.0%]

    ¹ 1296 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 3-ply, cube decisions: XG Roller

    eXtreme Gammon Version: 2.19.207.pre-release

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From pepstein5@gmail.com@21:1/5 to Tim Chow on Tue Nov 9 01:13:28 2021
    On Tuesday, November 9, 2021 at 2:10:21 AM UTC, Tim Chow wrote:
    XGID=-aa---E-C-A-cDb--bae----AA:0:0:1:55:0:0:0:0:10

    X:Player 1 O:Player 2
    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O O O | | O X |
    | X O O | | O |
    | X | | O |
    | X | | O |
    | | X | O |
    | |BAR| |
    | | | X |
    | | | X |
    | O X | | X |
    | O X | | X |
    | O X X | | X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 165 O: 161 X-O: 0-0
    Cube: 1
    X to play 55
    I chose to point on the 1pt, but XG agrees with badgolferman
    and ah_clem that the running play bar/10 13/8 is better, at
    least for money (at gammon go, XG slightly prefers 13/8 6/1*(2)).

    1. Rollout¹ Bar/10 13/8 eq:+0.210
    Player: 55.02% (G:15.76% B:0.91%)
    Opponent: 44.98% (G:12.76% B:0.44%)
    Confidence: ±0.014 (+0.197..+0.224) - [100.0%]

    2. Rollout¹ Bar/20 13/8 6/1*(2) eq:+0.130 (-0.081)
    Player: 51.84% (G:20.15% B:0.69%)
    Opponent: 48.16% (G:12.95% B:0.64%)
    Confidence: ±0.017 (+0.113..+0.146) - [0.0%]

    3. Rollout¹ Bar/15 6/1*(2) eq:+0.127 (-0.084)
    Player: 52.23% (G:18.03% B:0.75%)
    Opponent: 47.77% (G:13.75% B:0.66%)
    Confidence: ±0.014 (+0.112..+0.141) - [0.0%]

    4. Rollout¹ Bar/10 6/1* eq:+0.103 (-0.107)
    Player: 52.63% (G:14.37% B:0.64%)
    Opponent: 47.37% (G:13.70% B:0.54%)
    Confidence: ±0.016 (+0.087..+0.120) - [0.0%]

    6/1*(2) wouldn't even feature in my candidates.
    My candidates would be the (probably) correct play
    and also bar/20 13/3 8/3.
    Is making the 3 point so bad that it doesn't even need to be mentioned?

    Paul

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to peps...@gmail.com on Tue Nov 9 23:59:17 2021
    On 11/9/2021 4:13 AM, peps...@gmail.com wrote:
    My candidates would be the (probably) correct play
    and also bar/20 13/3 8/3.
    Is making the 3 point so bad that it doesn't even need to be mentioned?

    XGR++ says that bar/20 13/3 8/3 is about a 0.2 error
    (i.e., a double whopper).

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to All on Fri Mar 18 09:01:35 2022
    XGID=--a--aE-C---dE-A-bbe----A-:0:0:1:55:0:0:0:0:10

    X:Player 1 O:Player 2
    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X X O O | | O X |
    | X O O | | O |
    | X | | O |
    | X | | O |
    | X | | O |
    | |BAR| |
    | | | X |
    | O | | X |
    | O X | | X |
    | O X | | X |
    | O X | | X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 158 O: 155 X-O: 0-0
    Cube: 1
    X to play 55

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)