• Rollout: Some kind of cube action 2

    From Timothy Chow@21:1/5 to All on Sat Jul 8 09:06:09 2023
    XGID=-a--bBDBBB--cB---d-e----A-:0:0:1:00:0:0:0:0:10

    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 |
    | O | | O |
    | O | | O |
    | | | O |
    | |BAR| |
    | | | |
    | | | X |
    | O | | X |
    | O X X X | | X X O |
    | O X X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 132 O: 167 X-O: 0-0
    Cube: 1
    X on roll, cube action

    O's only asset is her 4pt anchor. The extra straggler is more of a
    liability than an asset; O has no structure, so the extra contact
    favors X, who has increased gammon chances from the potential to
    attack that straggler. X's only liability is his own straggler.
    Does that give O enough counterplay to take? According to XG, no.
    But it's not as big a pass as one might think, because the high
    anchor covers over a multitude of sins.

    In the variant, I have moved one of X's spares around the board to
    O's bar point. This could be considered a reference position, not
    because it's right on the borderline of anything, but because it is
    simple enough to memorize easily.

    Analyzed in Rollout
    No double
    Player Winning Chances: 74.75% (G:16.94% B:0.51%)
    Opponent Winning Chances: 25.25% (G:3.76% B:0.12%)
    Double/Take
    Player Winning Chances: 74.21% (G:18.09% B:0.61%)
    Opponent Winning Chances: 25.79% (G:4.13% B:0.16%)

    Cubeful Equities:
    No double: +0.958 (-0.042)
    Double/Take: +1.073 (+0.073)
    Double/Pass: +1.000

    Best Cube action: Double / Pass

    Rollout:
    1296 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 3-ply, cube decisions: XG Roller
    Confidence No Double: ± 0.008 (+0.950..+0.966)
    Confidence Double: ± 0.016 (+1.056..+1.089)

    eXtreme Gammon Version: 2.19.211.pre-release

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

    XGID=-a--bBCBBB--cB---dAe----A-:0:0:1:00:0:0:0:0:10

    Score is X:0 O:0. Unlimited Game
    +13-14-15-16-17-18------19-20-21-22-23-24-+
    | X O X | | O X |
    | X O | | O |
    | O | | O |
    | O | | O |
    | | | O |
    | |BAR| |
    | | | |
    | | | |
    | O | | X |
    | O X X X | | X X O |
    | O X X X | | X X O O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 144 O: 167 X-O: 0-0
    Cube: 1
    X on roll, cube action

    Analyzed in Rollout
    No double
    Player Winning Chances: 73.58% (G:14.26% B:0.47%)
    Opponent Winning Chances: 26.42% (G:4.14% B:0.13%)
    Double/Take
    Player Winning Chances: 73.39% (G:14.66% B:0.56%)
    Opponent Winning Chances: 26.61% (G:4.25% B:0.14%)

    Cubeful Equities:
    No double: +0.925 (-0.042)
    Double/Take: +0.967
    Double/Pass: +1.000 (+0.033)

    Best Cube action: Double / Take

    Rollout:
    2592 Games rolled with Variance Reduction.
    Dice Seed: 271828
    Moves: 3-ply, cube decisions: XG Roller
    Confidence No Double: ± 0.009 (+0.917..+0.934)
    Confidence Double: ± 0.012 (+0.955..+0.980)

    eXtreme Gammon Version: 2.19.211.pre-release

    ---
    Tim Chow

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