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  • O has 8 checkers borne off

    From Timothy Chow@21:1/5 to All on Wed May 3 08:40:41 2023
    I'm not sure why XG doesn't draw the borne-off checkers. Sometimes
    I add them by hand, but I'm feeling lazy today. Oh, and X has
    2 checkers borne off already.

    XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | | | O O |
    | | | O O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | O | |
    | | | |
    | | | X X X | +---+
    | | | X X X X X | | 2 |
    | | | X X X X X | +---+
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 53 O: 35 X-O: 0-0
    Cube: 2, X own cube
    X to play 44

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to All on Fri May 5 12:29:16 2023
    XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | | | O O |
    | | | O O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | O | |
    | | | |
    | | | X X X | +---+
    | | | X X X X X | | 2 |
    | | | X X X X X | +---+
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 53 O: 35 X-O: 0-0
    Cube: 2, X own cube
    X to play 44

    I was rather surprised that XG thought that keeping a five-point board
    was so much better than ripping off an extra two checkers. I'm not sure
    I have any good techniques for making this type of decision in general.

    1. Rollout¹ 6/2(3) 4/Off eq:+0.263
    Player: 52.72% (G:0.00% B:0.00%)
    Opponent: 47.28% (G:0.00% B:0.00%)
    Confidence: ±0.005 (+0.258..+0.268) - [100.0%]

    2. Rollout¹ 5/1 4/Off(3) eq:+0.177 (-0.085)
    Player: 50.39% (G:0.00% B:0.00%)
    Opponent: 49.61% (G:0.00% B:0.00%)
    Confidence: ±0.006 (+0.171..+0.183) - [0.0%]

    ¹ 1296 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 4-ply, cube decisions: XG Roller+
    Search interval: Large

    eXtreme Gammon Version: 2.19.211.pre-release

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Stick Rice@21:1/5 to Timothy Chow on Fri May 5 20:44:52 2023
    On Friday, May 5, 2023 at 12:29:19 PM UTC-4, Timothy Chow wrote:
    XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | | | O O |
    | | | O O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | O | |
    | | | |
    | | | X X X | +---+
    | | | X X X X X | | 2 |
    | | | X X X X X | +---+
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 53 O: 35 X-O: 0-0
    Cube: 2, X own cube
    X to play 44
    I was rather surprised that XG thought that keeping a five-point board
    was so much better than ripping off an extra two checkers. I'm not sure
    I have any good techniques for making this type of decision in general.

    1. Rollout¹ 6/2(3) 4/Off eq:+0.263
    Player: 52.72% (G:0.00% B:0.00%)
    Opponent: 47.28% (G:0.00% B:0.00%)
    Confidence: ±0.005 (+0.258..+0.268) - [100.0%]

    2. Rollout¹ 5/1 4/Off(3) eq:+0.177 (-0.085)
    Player: 50.39% (G:0.00% B:0.00%)
    Opponent: 49.61% (G:0.00% B:0.00%)
    Confidence: ±0.006 (+0.171..+0.183) - [0.0%]

    ¹ 1296 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 4-ply, cube decisions: XG Roller+
    Search interval: Large

    eXtreme Gammon Version: 2.19.211.pre-release

    ---
    Tim Chow

    It's two extra checkers off immediately but overall not only does it leave a lot more shots immediately, it's such a slow bearoff that those 'extra two checkers off' come back to not being cumulatively more.

    Stick

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