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Advanced Backgammon #95 — 3 More Variants

Posted By: Taper_Mike
Date: Wednesday, 16 April 2014, at 2:35 a.m.

In Response To: Advanced Backgammon #95 -- Rollout and Variants (Igor)

Thanks for a great analysis, Igor.

These variants test the notion I suggested: I think this would be a take even if the outside blot were on the bar. Although I did not say so, I was thinking of your first reference position, 51S-55A-F-C , and mentally adjusting by bringing another Blue checker into the zone .

In addition to putting a White checker on the roof (which does turn out to be a take), I also tried moving White's other blot up to the 4pt and 5pt. The results dovetail nicely with your analysis.

One checker on the bar; blot on 2pt

Double/Take





White is Player 2

score: 0
pip: 167
Unlimited Game
Jacoby Beaver
pip: 145
score: 0

Blue is Player 1
XGID=aBaB--C-A--AeD---c-e----B-:0:0:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
  Player Winning Chances: 63.194% (G:32.068% B:0.603%) 63.118% (G:32.999% B:0.590%)
  Opponent Winning Chances: 36.806% (G:8.325% B:0.412%) 36.882% (G:8.512% B:0.444%)
  Cubeless Equities +0.5032 +1.0174
Cubeful Equities
No double:+0.6684 (-0.0831)
Double/Take:+0.7516
Double/Pass:+1.0000 (+0.2484)
 
Best Cube action: Double / Take

Rollout by Taper_Mike
2014-Apr-15
eXtreme Gammon Version: 2.10.199.2658
Robertie.AdvBg.095.variant.1-tm.xgp

eXtreme Gammon Version: 2.10

One checker on the bar; blot on 4pt

Double/Take





White is Player 2

score: 0
pip: 165
Unlimited Game
Jacoby Beaver
pip: 145
score: 0

Blue is Player 1
XGID=aB-Ba-C-A--AeD---c-e----B-:0:0:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
  Player Winning Chances: 63.973% (G:33.537% B:0.550%) 64.007% (G:34.797% B:0.546%)
  Opponent Winning Chances: 36.027% (G:7.948% B:0.376%) 35.993% (G:8.279% B:0.433%)
  Cubeless Equities +0.5371 +1.0929
Cubeful Equities
No double:+0.6736 (-0.1598)
Double/Take:+0.8334
Double/Pass:+1.0000 (+0.1666)
 
Best Cube action: Double / Take

Rollout by Taper_Mike
2014-Apr-15
eXtreme Gammon Version: 2.10.199.2658
Robertie.AdvBg.095.variant.2-tm.xgp

eXtreme Gammon Version: 2.10

One checker on the bar; blot on 5pt

Double/Pass





White is Player 2

score: 0
pip: 164
Unlimited Game
Jacoby Beaver
pip: 145
score: 0

Blue is Player 1
XGID=aB-B-aC-A--AeD---c-e----B-:0:0:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
  Player Winning Chances: 66.269% (G:38.126% B:0.560%) 66.336% (G:39.035% B:0.564%)
  Opponent Winning Chances: 33.731% (G:7.286% B:0.362%) 33.664% (G:7.484% B:0.397%)
  Cubeless Equities +0.6358 +1.2878
Cubeful Equities
No double:+0.7336 (-0.2664)
Double/Take:+1.0434 (+0.0434)
Double/Pass:+1.0000
 
Best Cube action: Double / Pass

Rollout by Taper_Mike
2014-Apr-15
eXtreme Gammon Version: 2.10.199.2658
Robertie.AdvBg.095.variant.3-tm.xgp

eXtreme Gammon Version: 2.10

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