eXtreme Gammon 2 Level of Play

The following data are from a set of 1000 games played between XG1 3-ply. The games were analyzed using each level (normal Search interval). All the differences (for level greater than 2-ply) were rolled out using a 1296 games 3-ply Rollout (made using version 2). Differences for 1-ply and 2-ply were analyzed using XGR+.

A total of  14,376  move candidates and 546 Double decisions were rolled. There was a total of 35,894 non trivial decisions (30,360 moves, 5534 cubes).

The resulting normalized equity lost by each level is aggregated in the table below. The error are calculated from 3-ply Rollout, which is not perfect. Neil Kazaross's guess is that it creates a 0.3 PR difference (meaning XGRoller++ may be around 0.43 PR)

Ply	Checker Play	Missed Double	Wrong Double	Wrong Take	Wrong Pass	Total Cube	Total	PR
XGR++	8.822	0.538	0.423	0.580	0.245	1.786	10.608	0.15
XGR+	12.701	0.768	0.515	0.833	0.237	2.353	15.054	0.21
5-ply	16.172	1.399	0.847	1.874	0.373	4.493	20.665	0.29
4-ply	21.245	1.819	1.158	1.692	0.247	4.916	26.161	0.36
XGR	24.007	1.283	1.057	1.513	0.319	4.172	28.179	0.39
3-ply	27.094	2.207	1.362	2.303	0.319	6.191	33.285	0.46
3-ply red	36.754	2.694	1.603	2.379	0.378	7.054	43.808	0.61
2-ply	63.800	19.725	2.439	2.163	0.744	25.101	88.901	1.24
1-ply	117.073	19.174	4.636	4.515	1.706	30.031	147.104	2.05
V1 3-ply	47.149	5.238	3.170	7.019	0.651	16.078	63.227	0.88

Note: XGRoller level has been redesigned in version 2 so it is a level between 3 and 4 ply in term of speed and strength (in version 1 , 4-ply and XGR are quite equivalent).

Here is a graph showing the Strength vs Speed:
Red: eXtreme Gammon Version 2
Blue: eXtreme Gammon Version 1
Purple: GnuBG
Orange: Snowie
Green: BGBlitz

Levels: 3r=3-ply Red, 3=3-ply, X=XGroller, 4=4-ply, +=XRoller+, 5=5-ply, ++=XGroller++

Click on the images to enlarge