BGonline.org Forums

501 Essential Backgammon Problems #101 -- Rollout + Variant

Posted By: Igor
Date: Thursday, 19 September 2013, at 2:00 a.m.

In Response To: 501 Essential Backgammon Problems #101 (Igor)

The only thing we have in our favor in this priming game is timing. If we manage to contain two white back checkers she would be forced to crunch soon. The best way to block the white back checkers is to make the bar point. The easiest way to make the bar point is to slot it now. We won't be happy if we get hit, but we are not going to win unless we make the bar point before white escapes. Even one escaped checker will provide additional timing to let the other one escape as well. The best move is not even mentioned by Robertie; it might not be obvious that it is best in this position, but at least it is one of the strong candidates to consider.

		White is Player 2 score: 0 pip: 127 Unlimited Game Jacoby pip: 154 score: 0 Blue is Player 1
XGID=-b--BBC-A-A-cD-----bbbbbB-:0:0:1:65:0:0:1:0:10
Blue to play 65

1.	Rollout1	13/8 13/7	eq: -0.350
	Player: Opponent: 42.64% (G:10.02% B:0.52%) 57.36% (G:27.45% B:3.71%) Conf.: ± 0.015 (-0.366...-0.335) - [100.0%] Duration: 27 minutes 31 seconds
2.	Rollout1	13/8 10/4	eq: -0.409 (-0.058)
	Player: Opponent: 40.51% (G:11.98% B:0.48%) 59.49% (G:21.54% B:1.86%) Conf.: ± 0.011 (-0.420...-0.397) - [0.0%] Duration: 32 minutes 08 seconds
3.	Rollout1	24/13	eq: -0.849 (-0.499)
	Player: Opponent: 36.36% (G:8.74% B:0.44%) 63.64% (G:37.81% B:1.11%) Conf.: ± 0.014 (-0.863...-0.835) - [0.0%] Duration: 26 minutes 17 seconds
1 1296 Games rolled with Variance Reduction. Dice Seed: 93968057 Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10

If our timing advantage is reduced, then the safe play becomes a contender. White will have difficult enough time extricating three back checkers. Still, timing is in our favor, so slotting is a tad ahead of the safe play.

		White is Player 2 score: 0 pip: 138 Unlimited Game Jacoby pip: 154 score: 0 Blue is Player 1
XGID=-c--BBC-A-A-bD-----bbbbbB-:0:0:1:65:0:0:1:0:10
Blue to play 65

1.	Rollout1	13/8 13/7	eq: +0.060
	Player: Opponent: 52.18% (G:16.10% B:1.12%) 47.82% (G:23.08% B:3.08%) Conf.: ± 0.003 (+0.056...+0.063) - [100.0%] Duration: 1 hour 41 minutes
2.	Rollout1	13/8 10/4	eq: +0.047 (-0.013)
	Player: Opponent: 51.32% (G:18.06% B:1.34%) 48.68% (G:18.94% B:1.55%) Conf.: ± 0.004 (+0.043...+0.051) - [0.0%] Duration: 4 hours 11 minutes
3.	Rollout2	24/13	eq: -0.165 (-0.225)
	Player: Opponent: 48.57% (G:15.81% B:1.31%) 51.43% (G:30.70% B:1.10%) Conf.: ± 0.012 (-0.177...-0.153) - [0.0%] Duration: 23 minutes 35 seconds
1 10368 Games rolled with Variance Reduction. Dice Seed: 56773318 Moves: 4-ply, cube decisions: XG Roller+ 2 1296 Games rolled with Variance Reduction. Dice Seed: 56773318 Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10

Messages In This Thread

• 501 Essential Backgammon Problems #101
  Igor -- Tuesday, 17 September 2013, at 12:21 a.m.
  • 501 Essential Backgammon Problems #101
    konstantin -- Tuesday, 17 September 2013, at 10:22 a.m.
  • 501 Essential Backgammon Problems #101
    ah_clem -- Tuesday, 17 September 2013, at 3:58 p.m.
  • 501 Essential Backgammon Problems #101
    Ian Shaw -- Tuesday, 17 September 2013, at 5:25 p.m.
  • 501 Essential Backgammon Problems #101
    Dmitriy Obukhov -- Tuesday, 17 September 2013, at 5:58 p.m.
  • 501 Essential Backgammon Problems #101 -- Rollout + Variant
    Igor -- Thursday, 19 September 2013, at 2:00 a.m.
    • 501 Essential Backgammon Problems #101 -- Rollout + Variant
      David Presser -- Thursday, 19 September 2013, at 4:56 a.m.
      • 501 Essential Backgammon Problems #101 -- Rollout + Variant
        Igor -- Thursday, 19 September 2013, at 4:05 p.m.
        • 501 Essential Backgammon Problems #101 -- Rollout + Variant
          David Presser -- Thursday, 19 September 2013, at 6:08 p.m.
          • 501 Essential Backgammon Problems #101 -- Rollout + Variant
            Igor -- Thursday, 19 September 2013, at 6:44 p.m.