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Rollout, and my question

Posted By: Timothy Chow
Date: Thursday, 22 July 2010, at 12:33 a.m.

In Response To: Two positions from Jake Jacobs (Timothy Chow)

In Jake's article, he says that according to both Snowie and eXtreme Gammon rollouts, the right play in the first position is 17/12(2) 13/8(2), whereas the right play in the second position is 17/12(2) 6/1(2). He further claims that not making the top play is a blunder in each case.

However, the GNU rollouts below favor 17/12(2) 6/1(2) in both positions. My question is whether other people can confirm that GNU differs sharply from Snowie and XG in the first position?

I note that I still seem to be having trouble with the new board images here; maybe it has something to do with the fact that it's the Crawford game so there's no cube anywhere?

---

The score (after 0 games) is: Schmucki 8, Jake 1 (match to 9 points, Crawford game)

Move number 4: Jake to play 55

Schmucki	65
Jake	120
Position ID: 790AwAC2bcAwAg Match ID: 0Ik2AYAACAAA

• Jake moves 17/12(2) 6/1(2)

#		Ply	Move	Equity
•	1	R	17/12(2) 6/1(2)	+0.626
			0.686 0.210 0.006 - 0.314 0.112 0.000 +0.626 +0.626 0.001 0.002 0.000 - 0.001 0.005 0.000 0.004 0.004
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852459995 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	2	R	17/12(2) 13/8(2)	+0.563 ( -0.064)
			0.675 0.175 0.006 - 0.325 0.051 0.000 +0.563 +0.563 0.001 0.002 0.000 - 0.001 0.004 0.000 0.003 0.003
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852459995 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]

---

The score (after 0 games) is: Schmucki 8, Jake 1 (match to 9 points, Crawford game)

Move number 4: Jake to play 55

Schmucki	60
Jake	120
Position ID: 33cAwAC2bcAwAg Match ID: 0Ik2AYAACAAA

• Jake moves 17/12(2) 6/1(2)

#		Ply	Move	Equity
•	1	R	17/12(2) 6/1(2)	+0.815
			0.752 0.255 0.009 - 0.248 0.080 0.000 +0.815 +0.815 0.001 0.003 0.000 - 0.001 0.004 0.001 0.004 0.004
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852302465 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	2	R	17/12(2) 13/8(2)	+0.704 ( -0.110)
			0.723 0.212 0.007 - 0.277 0.043 0.000 +0.704 +0.704 0.001 0.002 0.000 - 0.001 0.004 0.000 0.003 0.003
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852302465 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]

Messages In This Thread

• Two positions from Jake Jacobs
  Timothy Chow -- Tuesday, 20 July 2010, at 11:58 p.m.
  • Two positions from Jake Jacobs
    Christian Munk-Christensen -- Wednesday, 21 July 2010, at 6:30 a.m.
  • Cube Action in Jake's Two Positions
    Paul Weaver -- Wednesday, 21 July 2010, at 4:29 p.m.
  • Sorry...wrong score!
    Timothy Chow -- Wednesday, 21 July 2010, at 9:49 p.m.
  • Rollout, and my question
    Timothy Chow -- Thursday, 22 July 2010, at 12:33 a.m.
    • Rollout, and my question
      Stick -- Thursday, 22 July 2010, at 12:53 a.m.
      • Rollout, and my question
        Timothy Chow -- Thursday, 22 July 2010, at 2:03 a.m.
  • Two positions from Jake Jacobs
    Jake Jacobs -- Thursday, 22 July 2010, at 4:55 a.m.
    • Two positions from Jake Jacobs
      Timothy Chow -- Wednesday, 28 July 2010, at 1:35 a.m.
  • Two positions from Jake Jacobs
    garyo -- Thursday, 22 July 2010, at 11:01 p.m.
    • Two positions from Jake Jacobs
      Stick -- Thursday, 22 July 2010, at 11:14 p.m.