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Jacoby makes a difference to the checker play

Posted By: Timothy Chow
Date: Saturday, 20 September 2014, at 7:34 p.m.

In Response To: 4away 5away 21 to play (tuvi)

tuvi recently posted one of those rare positions in which the Jacoby rule makes a difference to the checker play.

With Jacoby:

		White is Player 2 score: 0 pip: 89 Unlimited Game Jacoby pip: 112 score: 0 Blue is Player 1
XGID=-A-BCCBb----aB-----cBbbcb-:0:0:1:21:0:0:1:0:10
Blue to play 21

1.	Rollout1	13/11 13/12*	eq: +0.084
	Player: Opponent: 48.63% (G:15.35% B:0.29%) 51.37% (G:26.32% B:0.57%) Conf.: ± 0.011 (+0.073...+0.095) - [70.7%] Duration: 3 minutes 25 seconds
2.	Rollout1	4/1	eq: +0.080 (-0.004)
	Player: Opponent: 51.26% (G:9.75% B:0.22%) 48.74% (G:7.65% B:0.09%) Conf.: ± 0.009 (+0.072...+0.089) - [29.3%] Duration: 6 minutes 22 seconds
3.	Rollout1	13/12* 5/3	eq: +0.050 (-0.034)
	Player: Opponent: 48.71% (G:15.30% B:0.30%) 51.29% (G:26.83% B:0.56%) Conf.: ± 0.012 (+0.038...+0.061) - [0.0%] Duration: 3 minutes 13 seconds
4.	Rollout1	13/12* 12/10	eq: +0.022 (-0.062)
	Player: Opponent: 48.11% (G:14.77% B:0.32%) 51.89% (G:25.60% B:0.50%) Conf.: ± 0.009 (+0.012...+0.031) - [0.0%] Duration: 2 minutes 57 seconds
1 1296 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

White is not supposed to double from the bar after being hit, but that means she can't win any gammons after her best sequences.

---

Without Jacoby:

		White is Player 2 score: 0 pip: 89 Unlimited Game pip: 112 score: 0 Blue is Player 1
XGID=-A-BCCBb----aB-----cBbbcb-:0:0:1:21:0:0:0:0:10
Blue to play 21

1.	Rollout1	4/1	eq: +0.083
	Player: Opponent: 51.19% (G:10.49% B:0.25%) 48.81% (G:7.97% B:0.09%) Conf.: ± 0.009 (+0.074...+0.093) - [100.0%] Duration: 6 minutes 54 seconds
2.	Rollout1	13/11 13/12*	eq: -0.009 (-0.092)
	Player: Opponent: 48.07% (G:15.02% B:0.26%) 51.93% (G:27.05% B:0.76%) Conf.: ± 0.011 (-0.020...+0.003) - [0.0%] Duration: 6 minutes 05 seconds
3.	Rollout1	13/12* 5/3	eq: -0.021 (-0.105)
	Player: Opponent: 48.21% (G:15.11% B:0.28%) 51.79% (G:27.65% B:0.75%) Conf.: ± 0.012 (-0.034...-0.009) - [0.0%] Duration: 6 minutes 00 second
4.	Rollout1	13/12* 12/10	eq: -0.062 (-0.145)
	Player: Opponent: 47.25% (G:14.42% B:0.30%) 52.75% (G:26.43% B:0.73%) Conf.: ± 0.011 (-0.073...-0.051) - [0.0%] Duration: 5 minutes 59 seconds
1 1296 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

Messages In This Thread

• 4away 5away 21 to play
  tuvi -- Saturday, 13 September 2014, at 2:06 p.m.
  • 4away 5away 21 to play
    Timothy Chow -- Saturday, 13 September 2014, at 5:46 p.m.
    • 4away 5away 21 to play
      Fatboy -- Saturday, 13 September 2014, at 5:54 p.m.
      • 4away 5away 21 to play
        David Rennie -- Saturday, 13 September 2014, at 6:30 p.m.
  • 4away 5away 21 to play
    hominid -- Sunday, 14 September 2014, at 12:20 a.m.
  • 4away 5away 21 to play
    BenF -- Sunday, 14 September 2014, at 12:34 a.m.
  • 4away 5away 21 to play
    tuvi -- Sunday, 14 September 2014, at 3:18 a.m.
    • 4away 5away 21 to play
      Petter Bengtsson -- Sunday, 14 September 2014, at 7:45 a.m.
  • 4away 5away 21 to play
    neilkaz -- Sunday, 14 September 2014, at 4:21 a.m.
  • Jacoby makes a difference to the checker play
    Timothy Chow -- Saturday, 20 September 2014, at 7:34 p.m.