• Lover's leap?

    From Timothy Chow@21:1/5 to All on Thu Apr 27 12:36:05 2023
    XGID=-b--aAE-DA--eC---b-e----A-:0:0:1:65:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O | | O X |
    | X O | | O |
    | X | | O |
    | | | O |
    | | | O |
    | |BAR| |
    | O | | X |
    | O X | | X |
    | O X | | X |
    | O X | | X O |
    | O X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 139 O: 180 X-O: 0-0
    Cube: 1
    X to play 65

    ---
    Tim Chow

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  • From Robert Zimmerman@21:1/5 to Timothy Chow on Thu Apr 27 15:43:09 2023
    On Thursday, April 27, 2023 at 12:36:09 PM UTC-4, Timothy Chow wrote:
    XGID=-b--aAE-DA--eC---b-e----A-:0:0:1:65:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O | | O X |
    | X O | | O |
    | X | | O |
    | | | O |
    | | | O |
    | |BAR| |
    | O | | X |
    | O X | | X |
    | O X | | X |
    | O X | | X O |
    | O X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 139 O: 180 X-O: 0-0
    Cube: 1
    X to play 65

    ---
    Tim Chow
    This may be one of those situations where X is so far ahead that it doesn't hurt to lose some pips for the sake of waiting to make points where you want them, rather then settling for the three point. Also, X could stand to have his midpoint replenished
    with the 65. The alternative play, making the three point, is so-so. Pro: X's front-heavy position. Cons: O has a deep anchor and a chance at an advanced anchor; making the three point doesn't reduce Os shots by much.
    To me, the pip count makes the leap a reasonable play.
    Bob

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  • From Timothy Chow@21:1/5 to All on Sat Apr 29 14:34:58 2023
    XGID=-b--aAE-DA--eC---b-e----A-:0:0:1:65:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O | | O X |
    | X O | | O |
    | X | | O |
    | | | O |
    | | | O |
    | |BAR| |
    | O | | X |
    | O X | | X |
    | O X | | X |
    | O X | | X O |
    | O X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 139 O: 180 X-O: 0-0
    Cube: 1
    X to play 65

    I was not able to find a plausible variant of this position in which
    XG plays 24/13. Making the 3pt reduces shots, makes a useful offensive
    point, and unstacks the 8pt.

    I eventually did find a position in which XG plays 24/13, but it's such
    a drastic modification that I'm not even going to call it a variant.

    1. Rollout¹ 9/3 8/3 eq:+0.515
    Player: 60.73% (G:21.33% B:1.28%)
    Opponent: 39.27% (G:8.54% B:0.31%)
    Confidence: ±0.016 (+0.499..+0.531) - [100.0%]

    2. Rollout¹ 24/13 eq:+0.393 (-0.122)
    Player: 58.90% (G:17.30% B:1.08%)
    Opponent: 41.10% (G:10.11% B:0.41%)
    Confidence: ±0.015 (+0.378..+0.408) - [0.0%]

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

    eXtreme Gammon Version: 2.19.211.pre-release

    -------------------
    Some other position
    -------------------

    XGID=-b--a-E-CA-BeC---b-e----A-:0:0:1:65:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O | | O X |
    | X O | | O |
    | X | | O |
    | | | O |
    | | | O |
    | |BAR| |
    | O | | X |
    | O | | X |
    | O X | | X |
    | O X X | | X O |
    | O X X X | | X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 148 O: 180 X-O: 0-0
    Cube: 1
    X to play 65

    1. Rollout¹ 24/13 eq:+0.621
    Player: 64.48% (G:17.60% B:0.98%)
    Opponent: 35.52% (G:7.53% B:0.27%)
    Confidence: ±0.013 (+0.608..+0.634) - [100.0%]

    2. Rollout¹ 9/3 8/3 eq:+0.579 (-0.042)
    Player: 62.48% (G:21.76% B:1.55%)
    Opponent: 37.52% (G:8.13% B:0.32%)
    Confidence: ±0.013 (+0.567..+0.592) - [0.0%]

    ¹ 2592 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 3-ply, cube decisions: XG Roller

    eXtreme Gammon Version: 2.19.211.pre-release

    ---
    Tim Chow

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