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You mean XG Roller setting? Couldn't it be made a bit stronger..ie it is so fast

Posted By: Ian Shaw
Date: Friday, 10 July 2009, at 10:46 p.m.

In Response To: You mean XG Roller setting? Couldn't it be made a bit stronger..ie it is so fast (Gregg Cattanach)

Thanks Gregg. I was looking for those settings. Do you or anyone else know whether XG uses variance reduction for this rollout setting, and whether it is cubeful?

I've tried to replicate these settings with gnubg, and switching off VR makes a huge difference. With VR, I got 53 seconds. Without VR, it was down to three seconds, pretty much the same as XG. Turning on cubeful still completed in just a few seconds.

If XG is including VR at that speed, then I'm impressed.

Here is a rollout of an opening 43. The top two plays use VR, the next ones don't. The confidence levels are much better with VR, but you have the speed penalty.

1. Rollout 13/10 13/9 Eq.: -0.011

0.490 0.152 0.006 - 0.510 0.142 0.007 CL -0.011

[0.000 0.000 0.000 - 0.000 0.000 0.000 CL 0.001]

Truncated cubeless rollout (depth 5) (trunc. at one-sided bearoff) with var.redn.

3600 games, Mersenne Twister dice gen. with seed 863222374 and quasi-random dice

Play: 0-ply cubeful prune

Cube: 0-ply cubeful prune

2. Rollout 24/21 13/9 Eq.: -0.013 ( -0.002)

0.493 0.140 0.006 - 0.507 0.139 0.005 CL -0.013

[0.000 0.000 0.000 - 0.000 0.000 0.000 CL 0.001]

Truncated cubeless rollout (depth 5) (trunc. at one-sided bearoff) with var.redn.

3600 games, Mersenne Twister dice gen. with seed 863222374 and quasi-random dice

Play: 0-ply cubeful prune

Cube: 0-ply cubeful prune

3. Rollout 24/20 13/10 Eq.: -0.021 ( -0.010)

0.490 0.136 0.005 - 0.510 0.139 0.005 CL -0.021

[0.002 0.001 0.000 - 0.002 0.001 0.000 CL 0.006]

Truncated cubeless rollout (depth 5) (trunc. at one-sided bearoff) without var.redn.

3600 games, Mersenne Twister dice gen. with seed 863222374 and quasi-random dice

Play: 0-ply cubeful prune

Cube: 0-ply cubeful prune

4. Rollout 24/21 24/20 Eq.: -0.032 ( -0.020)

0.489 0.122 0.005 - 0.511 0.133 0.004 CL -0.032

[0.002 0.001 0.000 - 0.002 0.001 0.000 CL 0.005]

Truncated cubeless rollout (depth 5) (trunc. at one-sided bearoff) without var.redn.

3600 games, Mersenne Twister dice gen. with seed 863222374 and quasi-random dice

Play: 0-ply cubeful prune

Cube: 0-ply cubeful prune

5. Rollout 13/6 Eq.: -0.111 ( -0.100)

0.470 0.134 0.005 - 0.530 0.153 0.006 CL -0.081 CF -0.111

[0.002 0.001 0.000 - 0.002 0.001 0.000 CL 0.005 CF 0.007]

Truncated cubeful rollout (depth 5) without var.redn.

3600 games, Mersenne Twister dice gen. with seed 863222374 and quasi-random dice

Play: 0-ply cubeful prune [expert]

Cube: 0-ply cubeful prune [expert]

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