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Variant positions: Run or prime?

Posted By: Timothy Chow
Date: Thursday, 20 May 2010, at 1:34 a.m.

In Response To: Run or prime? (Timothy Chow)

I rolled out two variant positions. It seems that there are some fairly delicate tradeoffs going on despite the sizable shifts in equity. In the first position below, running leaves 15 shots and priming leaves 17 shots but priming is still slightly better; however, best of all is lifting, which leaves 15 shots but only one blot.

In the second position below, running leaves 13 shots and "priming" leaves 15 shots; I put "priming" in quotes because the new point that is made does not really help form a six-prime. Running significantly beats priming here, and lifting, which leaves 15 shots and one blot, is a whopper.

---

First position:

gnubg	127
tchow	122
Position ID: bPeAATCcbRkDEA Match ID: cAkZAAAAEAAA

#		Ply	Move	Equity
•	1	R	23/17 8/6	+0.500
			0.647 0.137 0.007 - 0.353 0.122 0.004 +0.313 +0.500 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852719734 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	23/17 10/8	+0.469 ( -0.031)
			0.649 0.131 0.007 - 0.351 0.130 0.004 +0.302 +0.469 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852719734 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	23/15	+0.431 ( -0.069)
			0.637 0.123 0.006 - 0.363 0.153 0.006 +0.245 +0.431 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.007
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 852719734 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]

---

Second position:

gnubg	127
tchow	125
Position ID: bPeAATCcbTIDEA Match ID: cAkZAAAAEAAA

#		Ply	Move	Equity
•	1	R	23/15	+0.459
			0.632 0.108 0.005 - 0.368 0.139 0.004 +0.235 +0.459 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 853043987 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	23/17 11/9	+0.392 ( -0.067)
			0.623 0.116 0.006 - 0.377 0.138 0.004 +0.226 +0.392 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.010
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 853043987 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	23/17 9/7	+0.307 ( -0.152)
			0.602 0.109 0.005 - 0.398 0.144 0.004 +0.171 +0.307 0.001 0.001 0.000 - 0.001 0.002 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 853043987 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

• Run or prime?
  Timothy Chow -- Sunday, 16 May 2010, at 9:28 p.m.
  • Run or prime?
    Max Urban -- Monday, 17 May 2010, at 8:06 a.m.
  • Run or prime?
    Ian Shaw -- Monday, 17 May 2010, at 9:45 a.m.
    • Run or prime?
      Christian Munk-Christensen -- Monday, 17 May 2010, at 10:46 a.m.
  • Run or prime?
    johnk -- Monday, 17 May 2010, at 3:23 p.m.
  • Run or prime?
    Daniel Murphy -- Monday, 17 May 2010, at 5:31 p.m.
  • Run or prime?
    Matt Cohn-Geier -- Monday, 17 May 2010, at 7:56 p.m.
  • Rollout: Run or prime?
    Timothy Chow -- Tuesday, 18 May 2010, at 1:13 a.m.
    • Rollout: Run or prime?
      Matt Cohn-Geier -- Tuesday, 18 May 2010, at 1:22 a.m.
    • Rollout: Run or prime?
      Christian Munk-Christensen -- Tuesday, 18 May 2010, at 7:46 a.m.
    • Rollout: Run or prime?
      Daniel Murphy -- Tuesday, 18 May 2010, at 2:16 p.m.
    • Rollout: Run or prime?
      Timothy Chow -- Tuesday, 18 May 2010, at 5:14 p.m.
  • Variant positions: Run or prime?
    Timothy Chow -- Thursday, 20 May 2010, at 1:34 a.m.
    • Efficiency of points
      Chuck Bower -- Thursday, 20 May 2010, at 4:40 p.m.
      • Efficiency of points
        Matt Cohn-Geier -- Thursday, 20 May 2010, at 5:30 p.m.
    • Variant positions: Run or prime?
      Daniel Murphy -- Thursday, 20 May 2010, at 5:39 p.m.