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501 Essential Backgammon Problems #28 — RO of Another Variant

Posted By: Taper_Mike
Date: Saturday, 17 August 2013, at 11:41 p.m.

In Response To: 501 Essential Backgammon Problems #28 -- Rollout + Variants (Igor)

 

		White is Player 2 score: 0 pip: 156 Unlimited Game Jacoby Beaver pip: 159 score: 0 Blue is Player 1
XGID=--aB--DaB---dE--ac-e----B-:0:0:1:21:0:0:3:0:10
Blue to play 21

1.	Rollout1	13/11 8/7*	eq: -0.0003
	Player: Opponent: 49.36% (G:16.77% B:0.88%) 50.64% (G:15.06% B:1.02%) Conf.: ±0.0086 (-0.0089...+0.0083) - [78.3%] Duration: 39 minutes 46 seconds
2.	Rollout1	24/22 8/7*	eq: -0.0052 (-0.0049)
	Player: Opponent: 49.58% (G:16.47% B:0.83%) 50.42% (G:14.71% B:0.84%) Conf.: ±0.0089 (-0.0141...+0.0037) - [21.7%] Duration: 40 minutes 43 seconds
3.	Rollout1	24/21	eq: -0.0540 (-0.0538)
	Player: Opponent: 48.17% (G:13.54% B:0.50%) 51.83% (G:12.82% B:0.53%) Conf.: ±0.0071 (-0.0611...-0.0470) - [0.0%] Duration: 35 minutes 10 seconds
1 5184 Games rolled with Variance Reduction. Dice Seed: 25331841 Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

42Z-53P-62U-21 — Unlimited Games

Bot	Seed	Equity	Nacbracs	Link
GnuBg 0.xx 2-ply Trunc	723661582	–32.226	[X H16 U48] /0.360t	Taper_Mike
XG 2.10 XGR++ Eval	[XGR++ seed]	+6.1	[X H17 U56] "&e	Taper_Mike
XG 2.10 3-ply, Cubes: XGR	25331841	–0.3	[H X5 U54] "<=5	Taper_Mike (above)

Key: H = Hit [13/11, 8/7*], U = Up [24/21], X = Hit and split [24/22, 8/7*]

Explanation of nacbracs

Reference Position: 42Z-53P-62U-21

This is the variant I proposed in my original reply. It differs from the original position by moving a checker back from the opponent’s 8pt to his 9pt.

With that change, X (Hit and split) gains enough to become a legitimate alternative to my top choice, H (Hit).

Mike

Messages In This Thread

• 501 Essential Backgammon Problems #28
  Igor -- Friday, 16 August 2013, at 12:16 a.m.
  • 501 Essential Backgammon Problems #28
    Casper van der Tak -- Friday, 16 August 2013, at 12:57 a.m.
    • 501 Essential Backgammon Problems #28
      garyo -- Friday, 16 August 2013, at 4:19 p.m.
  • 501 Essential Backgammon Problems #28 — 52S-53P-62U-21
    Taper_Mike -- Friday, 16 August 2013, at 8:04 a.m.
  • 501 Essential Backgammon Problems #28
    kruidenbuiltje -- Friday, 16 August 2013, at 10:27 a.m.
  • 501 Essential Backgammon Problems #28
    ah_clem -- Friday, 16 August 2013, at 3:06 p.m.
  • 501 Essential Backgammon Problems #28 -- Rollout + Variants
    Igor -- Saturday, 17 August 2013, at 4:10 p.m.
    • 501 Essential Backgammon Problems #28 -- More ROs
      Stick -- Saturday, 17 August 2013, at 4:26 p.m.
    • 501 Essential Backgammon Problems #28 — RO of Another Variant
      Taper_Mike -- Saturday, 17 August 2013, at 11:41 p.m.