1. Forum
  2. Usenet
  3. REC.GAMES.BACKGAMMON

  • Priming play

    From Timothy Chow@21:1/5 to All on Sat Jan 15 12:26:28 2022
    XGID=-a-BB-BBB---bB---bbdbBb-A-:0:0:1:43:0:0:0:0:10

    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 X O X |
    | X O O | | O O X O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | | | |
    | O X X | | X X X |
    | O X X | | X X X O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 148 O: 120 X-O: 0-0
    Cube: 1
    X to play 43

    ---
    Tim Chow

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From badgolferman@21:1/5 to Timothy Chow on Sun Jan 16 12:44:33 2022
    Timothy Chow wrote:

    XGID=-a-BB-BBB---bB---bbdbBb-A-:0:0:1:43:0:0:0:0:10

    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 X O X |
    | X O O | | O O X O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | | | |
    | O X X | | X X X |
    | O X X | | X X X O | +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 148 O: 120 X-O: 0-0
    Cube: 1
    X to play 43

    ---
    Tim Chow


    I'm sure there's some funky advanced play involved but I would just
    play 13/9, 13/10

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Timothy Chow@21:1/5 to All on Mon Jan 17 09:42:58 2022
    XGID=-a-BB-BBB---bB---bbdbBb-A-:0:0:1:43:0:0:0:0:10

    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 X O X |
    | X O O | | O O X O |
    | | | O |
    | | | O |
    | | | |
    | |BAR| |
    | | | |
    | | | |
    | | | |
    | O X X | | X X X |
    | O X X | | X X X O |
    +12-11-10--9--8--7-------6--5--4--3--2--1-+
    Pip count X: 148 O: 120 X-O: 0-0
    Cube: 1
    X to play 43

    Like badgolferman, I played 13/10 13/9, aiming to make my 5pt. But
    XG insists on 24/21 13/9. The trouble with 13/10 13/9 is that many
    of his sixes and fives won't play well next turn---his lack of
    flexibility means he'll either have to break anchor or dump checkers
    deeper in his board than he would like. Stepping up with 24/21 gives
    him a much-needed spare. Of course the downside is that he gives O
    a direct shot at his midpoint blot, but X is anchored, and it's a
    common theme in priming games that maintaining your own prime and
    jumping over your opponent's prime often takes precedence over avoiding
    blots.

    1. Rollout¹ 24/21 13/9 eq:-0.086
    Player: 48.42% (G:8.77% B:0.32%)
    Opponent: 51.58% (G:15.22% B:0.40%)
    Confidence: ±0.013 (-0.098..-0.073) - [100.0%]

    2. Rollout¹ 13/10 13/9 eq:-0.244 (-0.158)
    Player: 44.24% (G:9.62% B:0.39%)
    Opponent: 55.76% (G:17.76% B:0.86%)
    Confidence: ±0.012 (-0.256..-0.232) - [0.0%]

    3. Rollout¹ 24/21 8/4 eq:-0.328 (-0.242)
    Player: 40.74% (G:7.45% B:0.27%)
    Opponent: 59.26% (G:13.01% B:0.31%)
    Confidence: ±0.013 (-0.340..-0.315) - [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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)