• Rollout: Break the bar-point anchor? 2

    From Timothy Chow@21:1/5 to All on Sun Aug 1 19:26:09 2021
    XGID=-BCBBBB-----b-b---Bbbbbab-:0:0:1:53:0:0:0:0:10 e29e6437917197d4f98667bbebbaea82f851338d286d2348630
    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-+
    | O X | | O O O O O O |
    | O X | | O O O O O |
    | | | |
    | | | |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | | | X |
    | O | | X X X X X X |
    | O | | X X X X X X |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 80 O: 88 X-O: 0-0
    Cube: 1
    X to play 53

    Badgolferman wrote, "I'm 100% sure the bot says to run one of them."
    Actually, XG runs *both* of them---it's fewer shots that way. True,
    it's two blots, but X is dead in the water if even one blot is hit
    and he fails to hit back. It is important, of course, that O has a
    blot in her board so that X has a chance to hit back from the bar.
    Without that blot, XG plays safe and rips up the board.

    1. Rollout¹ 18/15 18/13 eq:-0.009
    Player: 47.56% (G:8.51% B:0.18%)
    Opponent: 52.44% (G:10.07% B:0.24%)
    Confidence: ±0.007 (-0.016..-0.003) - [100.0%]

    2. Rollout¹ 6/3 6/1 eq:-0.159 (-0.150)
    Player: 45.41% (G:2.50% B:0.04%)
    Opponent: 54.59% (G:4.34% B:0.09%)
    Confidence: ±0.009 (-0.167..-0.150) - [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

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