BGonline.org Forums

RO plus variants

Posted By: Igor
Date: Friday, 10 May 2013, at 3:30 p.m.

In Response To: Understanding Backgammon Position #50 (Igor)

This might be a good "borderline" reference position.

White is Player 2 score: 0 pip: 150 Unlimited Game Jacoby pip: 159 score: 0 Blue is Player 1 XGID=---aaBC-C-B-bCa--e-e----B-:0:0:1:00:0:0:1:0:10 Blue on roll, cube action?

Analyzed in Rollout No double Double/Take Player Winning Chances: 64.61% (G:23.58% B:1.26%) 64.74% (G:24.88% B:1.37%) Opponent Winning Chances: 35.39% (G:9.48% B:0.54%) 35.26% (G:9.71% B:0.59%) Cubeless Equities +0.440 +0.909 Cubeful Equities No double: +0.639 (0.000) ±0.002 (+0.636..+0.641) Double/Take: +0.639 ±0.004 (+0.635..+0.642) Double/Pass: +1.000 (+0.361) Best Cube action: Double / Take Rollout details 46656 Games rolled with Variance Reduction. Dice Seed: 53735565 Moves: 3-ply, cube decisions: XG Roller Double Decision confidence: 53.4% Take Decision confidence: 100.0% Duration: 5 hours 29 minutes

eXtreme Gammon Version: 2.10

Several simple variants:

White is Player 2 score: 0 pip: 155 Unlimited Game Jacoby pip: 159 score: 0 Blue is Player 1 XGID=---aaBC-C-B-cCa--d-e----B-:0:0:1:00:0:0:1:0:10 Blue on roll, cube action?

Analyzed in Rollout No double Double/Take Player Winning Chances: 63.08% (G:23.38% B:1.18%) 63.07% (G:24.74% B:1.25%) Opponent Winning Chances: 36.92% (G:9.67% B:0.55%) 36.93% (G:9.95% B:0.59%) Cubeless Equities +0.405 +0.832 Cubeful Equities No double: +0.589 ±0.010 (+0.579..+0.598) Double/Take: +0.551 (-0.037) ±0.017 (+0.534..+0.568) Double/Pass: +1.000 (+0.411) Best Cube action: No double / Take Percentage of wrong pass needed to make the double decision right: 7.7% Rollout details 2592 Games rolled with Variance Reduction. Dice Seed: 57394596 Moves: 3-ply, cube decisions: XG Roller Double Decision confidence: 100.0% Take Decision confidence: 100.0% Duration: 50 minutes 47 seconds

eXtreme Gammon Version: 2.10

White is Player 2 score: 0 pip: 150 Unlimited Game Jacoby pip: 157 score: 0 Blue is Player 1 XGID=---aaBC-CB--bCa--e-e----B-:0:0:1:00:0:0:1:0:10 Blue on roll, cube action?

Analyzed in Rollout No double Double/Take Player Winning Chances: 67.56% (G:24.09% B:1.29%) 67.52% (G:25.99% B:1.30%) Opponent Winning Chances: 32.44% (G:8.27% B:0.41%) 32.48% (G:8.56% B:0.47%) Cubeless Equities +0.518 +1.066 Cubeful Equities No double: +0.736 (-0.095) ±0.014 (+0.722..+0.750) Double/Take: +0.831 ±0.020 (+0.811..+0.851) Double/Pass: +1.000 (+0.169) Best Cube action: Double / Take Rollout details 1296 Games rolled with Variance Reduction. Dice Seed: 57394596 Moves: 3-ply, cube decisions: XG Roller Double Decision confidence: 100.0% Take Decision confidence: 100.0% Duration: 22 minutes 26 seconds

eXtreme Gammon Version: 2.10

White is Player 2 score: 0 pip: 150 Unlimited Game Jacoby pip: 161 score: 0 Blue is Player 1 XGID=---aaBC-C--BbCa--e-e----B-:0:0:1:00:0:0:1:0:10 Blue on roll, cube action?

Analyzed in Rollout No double Double/Take Player Winning Chances: 61.64% (G:20.39% B:0.93%) 61.76% (G:21.45% B:1.03%) Opponent Winning Chances: 38.36% (G:10.56% B:0.58%) 38.24% (G:10.78% B:0.64%) Cubeless Equities +0.335 +0.692 Cubeful Equities No double: +0.511 ±0.018 (+0.493..+0.529) Double/Take: +0.411 (-0.100) ±0.024 (+0.387..+0.436) Double/Pass: +1.000 (+0.489) Best Cube action: No double / Take Percentage of wrong pass needed to make the double decision right: 14.5% Rollout details 1296 Games rolled with Variance Reduction. Dice Seed: 57394596 Moves: 3-ply, cube decisions: XG Roller Double Decision confidence: 100.0% Take Decision confidence: 100.0% Duration: 27 minutes 17 seconds

eXtreme Gammon Version: 2.10

Messages In This Thread

• Understanding Backgammon Position #50
  Igor -- Wednesday, 8 May 2013, at 5:12 p.m.
  • Understanding Backgammon Position #50
    Chuck Bower -- Wednesday, 8 May 2013, at 5:48 p.m.
    • Understanding Backgammon Position #50
      Stick -- Wednesday, 8 May 2013, at 5:54 p.m.
    • Understanding Backgammon Position #50
      Igor -- Wednesday, 8 May 2013, at 6:24 p.m.
  • Understanding Backgammon Position #50
    ah_clem -- Wednesday, 8 May 2013, at 6:59 p.m.
  • Understanding Backgammon Position #50
    neilkaz -- Wednesday, 8 May 2013, at 7:26 p.m.
    • Understanding Backgammon Position #50
      Igor -- Wednesday, 8 May 2013, at 7:36 p.m.
  • Understanding Backgammon Position #50
    Chase -- Wednesday, 8 May 2013, at 8:58 p.m.
  • RO plus variants
    Igor -- Friday, 10 May 2013, at 3:30 p.m.
    • +1...nice work done here..tyvm *NM*
      neilkaz -- Friday, 10 May 2013, at 3:35 p.m.
    • RO plus variants
      Igor -- Friday, 10 May 2013, at 3:49 p.m.