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Rollout: The first 4 is easy...what about the other three?

Posted By: Timothy Chow
Date: Sunday, 9 May 2010, at 1:31 a.m.

In Response To: The first 4 is easy...what about the other three? (Timothy Chow)

OTB I also played 24/20*/16 6/2(2). GNU 2-ply didn't like it and preferred 24/20* 13/9(3). The rollout, however, put my play on top and said that GNU 2-ply's move was a whopper. It's a little surprising to me that GNU 2-ply would play a whopper in what looks like a relatively normal position.

gnubg	148
tchow	154
Position ID: 0PPBAQPg28EBKA Match ID: cAkSACAACAAA

• tchow moves 24/20*/16 6/2(2)

#		Ply	Move	Equity
•	1	R	24/20*/16 6/2(2)	+0.345
			0.592 0.126 0.004 - 0.408 0.089 0.003 +0.221 +0.345 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.007
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 855505903 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	24/20* 8/4(3)	+0.277 ( -0.069)
			0.570 0.143 0.004 - 0.430 0.089 0.003 +0.194 +0.277 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.007
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 855505903 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]
	3	R	24/20* 13/9(3)	+0.210 ( -0.135)
			0.561 0.126 0.004 - 0.439 0.086 0.003 +0.164 +0.210 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 855505903 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]

---

I separately rolled out a couple more plays against GNU 2-ply's choice just for good measure:

gnubg	148
tchow	154
Position ID: 0PPBAQPg28EBKA Match ID: cAkSACAACAAA

#		Ply	Move	Equity
•	1	R	24/20*/16 7/3(2)	+0.270
			0.572 0.129 0.004 - 0.428 0.097 0.003 +0.176 +0.270 0.002 0.002 0.000 - 0.002 0.001 0.000 0.004 0.009
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 855312372 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	24/20*/16 13/9(2)	+0.222 ( -0.048)
			0.560 0.119 0.005 - 0.440 0.095 0.004 +0.146 +0.222 0.002 0.002 0.000 - 0.002 0.002 0.000 0.004 0.010
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 855312372 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]
	3	R	24/20* 13/9(3)	+0.212 ( -0.058)
			0.560 0.124 0.004 - 0.440 0.085 0.003 +0.160 +0.212 0.002 0.002 0.001 - 0.002 0.001 0.000 0.005 0.012
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 855312372 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

• The first 4 is easy...what about the other three?
  Timothy Chow -- Saturday, 8 May 2010, at 4:56 a.m.
  • The first 4 is easy...what about the other three?
    Marv Porten -- Saturday, 8 May 2010, at 5:19 a.m.
  • The first 4 is easy...what about the other three?
    John O'Hagan -- Saturday, 8 May 2010, at 5:28 a.m.
    • The first 4 is easy...what about the other three?
      Joe Russell -- Saturday, 8 May 2010, at 6:34 a.m.
  • The first 4 is easy...what about the other three?
    neilkaz -- Saturday, 8 May 2010, at 4:15 p.m.
  • Rollout: The first 4 is easy...what about the other three?
    Timothy Chow -- Sunday, 9 May 2010, at 1:31 a.m.