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41$-32S-31P-31 — No Jacoby, No Beavers — 3-ply XG2 Rollout

Posted By: Taper_Mike
Date: Friday, 30 May 2014, at 4:37 a.m.

In Response To: 54S-21H-61U-21P-21U-51N-31 and simpler variants (Nack Ballard)





White is Player 2

score: 0
pip: 158
Unlimited Game
pip: 162
score: 0

Blue is Player 1
XGID=-b----E-C--AdD---c-dbA--A-:0:0:1:31:0:0:0:0:10
Blue to play 31

1.Rollout124/21 11/10eq: -0.0960
Player:
Opponent:
47.02% (G:10.37% B:0.32%)
52.98% (G:9.97% B:0.38%)
Conf.: ±0.0019 (-0.0979...-0.0941) - [52.4%]
Duration: 7 hours 27 minutes
2.Rollout18/5 6/5eq: -0.0961 (-0.0001)
Player:
Opponent:
48.05% (G:14.00% B:0.69%)
51.95% (G:16.79% B:0.84%)
Conf.: ±0.0022 (-0.0983...-0.0939) - [47.6%]
Duration: 6 hours 56 minutes
 
1 62208 Games rolled with Variance Reduction.
Dice Seed: 55907283
Moves: 3-ply, cube decisions: XG Roller

Rollout by Taper_Mike
2014-May-28
eXtreme Gammon Version: 2.10.199.2658
41$-32S-31P-31-n-tm.xgp
n[B=P] "<=62
n[B P10] "&e

eXtreme Gammon Version: 2.10

41$-32S-31P-31 — Unlimited Games
Bot Seed Equity Nacbracs Link
XG 2.10 XGR++ Eval [XGR++ seed] –101.3 [B P5] "&e Taper_Mike
GnuBg 1.02 2-ply Trunc 710424267 –94.142 n[B P17] '/0.360t Taper_Mike
XG 2.10 3-ply, Cubes: XGR 55907283 –96.0 n[B=P] "<=62 Taper_Mike (above)
XG 2.10 XGR++ Eval [XGR++ seed] –97.9 n[B P10] "&e Taper_Mike

Key: B = Both [24/21, 11/10], P = Point [8/5, 6/5]

Nactation Tutorial • Explanation of nacbracs • Nacbracs for cube actions

Your choice. After 62k, it’s a dead heat.

In my no-Jacoby XGR++ eval, note that P loses up a tiny bit of equity compared to the Jacoby eval. Presumably, this effect would also be present if a full rollout were made using Jacoby.

Nack describes this position using the alias 41$-32S-31A-31. That works because there are two equivalent Nactations for the third-roll play:

A (Attack) = P (Point) = 9/5

Mike

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