[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums

4 ply/XGR+/XGR++/Rollout

Posted By: Taper_Mike
Date: Wednesday, 30 October 2013, at 11:41 p.m.

In Response To: 4 ply/XGR+/XGR++/Rollout (Daniel Murphy)

You may be confusing evals with rollouts. XGR, XGR+, and XGR++ are called "evals," but actually each of them is a truncated rollout. When you use one of them in a rollout, a separate truncated rollout is made for every move in the full rollout. That explains why it can be so slow.

I have Rollouts a, b, and c set up in GnuBg to simulate XGR++. See my post:

Simulating XG Roller++ in GNU Backgammon

Here is the info from the XG Help system:

XGRoller
The XG Roller levels setting relies on truncated rollouts to estimate the position. This has been proven to be an extremely efficient way to analyze a position. For instance a level like XGRoller+ is much stronger but faster than a 5-ply analysis.

Here are the settings used for the different levels of XGRoller

XGRoller
42 Games using VR with rotation on 21 dice
Truncated after 5 moves using 1-ply
All decisions in 1-ply

XGRoller+
360 games with VR
Truncated after 7 moves using 2-ply
Stop when reaching 0.010 Confidence (minimum 180 games)
First 2 decision in 2-ply
Then 1-ply checker and 2-ply cube

XGRoller++ Checker
360 games with VR
Truncated after 5 moves using 3-ply
First 2 decisions in 3-ply
Then 2-ply checker and 3-ply cube

XGRoller++ Cube
360 games with VR
Truncated after 7 moves using 3-ply
Stop when reaching 0.010 Confidence (minimum 180 games)
First 2 decisions in 3-ply
Then 2-ply checker and 3-ply cube

Mike

Messages In This Thread

 

Post Response
Your Name:
Your E-Mail Address:
Subject:
Message:

If necessary, enter your password below:

Password:
 

 

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums is maintained by Stick with WebBBS 5.12.