• Hit or make the bar?

    From Timothy Chow@21:1/5 to All on Sun Jan 16 13:40:05 2022
    XGID=-aa--BC-C-A-AC-a-cbdb-Ba--:0:0:1:61:0:0:0:0:10

    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 O X O |
    | X O O | | O O X |
    | X O | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | X | | X |
    | X | | X X |
    | X X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 157 O: 131 X-O: 0-0
    Cube: 1
    X to play 61

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to All on Tue Jan 18 10:08:12 2022
    XGID=-aa--BC-C-A-AC-a-cbdb-Ba--:0:0:1:61:0:0:0:0:10

    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 O X O |
    | X O O | | O O X |
    | X O | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | X | | X |
    | X | | X X |
    | X X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 157 O: 131 X-O: 0-0
    Cube: 1
    X to play 61

    X is behind in the pip count, and he can try to address this problem
    either by strengthening his own prime, or by hitting. The trouble
    with hitting is that he has to break anchor to do so, giving O some counterattacking possibilities. If he makes the bar point then it
    basically forces O to fight a priming battle that she has worse timing
    for. For comparison, see the variant below.

    1. Rollout¹ 13/7 8/7 eq:+0.608
    Player: 65.40% (G:17.01% B:0.77%)
    Opponent: 34.60% (G:10.22% B:0.39%)
    Confidence: ±0.014 (+0.593..+0.622) - [100.0%]

    2. Rollout¹ 22/15* eq:+0.413 (-0.194)
    Player: 62.02% (G:16.24% B:1.08%)
    Opponent: 37.98% (G:14.98% B:0.88%)
    Confidence: ±0.015 (+0.398..+0.429) - [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

    -------
    Variant
    -------

    XGID=-aa--BC-C---AC-a-cbdb-Ca--:0:0:1:61:0:0:0:0:10

    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 O X O |
    | X O O | | O O X |
    | X O | | O X |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | X | | X |
    | X | | X X |
    | X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 169 O: 131 X-O: 0-0
    Cube: 1
    X to play 61

    1. Rollout¹ 22/15* eq:+0.471
    Player: 62.37% (G:16.84% B:0.90%)
    Opponent: 37.63% (G:11.48% B:0.47%)
    Confidence: ±0.017 (+0.454..+0.489) - [99.8%]

    2. Rollout¹ 13/7 8/7 eq:+0.438 (-0.033)
    Player: 61.45% (G:15.84% B:0.68%)
    Opponent: 38.55% (G:12.58% B:0.44%)
    Confidence: ±0.013 (+0.425..+0.452) - [0.2%]

    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)