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Rollout of 53P-21 at Gammon Save

Posted By: David Rockwell
Date: Tuesday, 27 July 2010, at 7:51 p.m.

In Response To: Rollout of 53P-21 at Gammon Save (Gregg Cattanach)

This GNU rollout shows a preference to slot at GS with 21 after an opening 61P. Note that slotting is correct at all scores. I'm not prepared to articulate the reasons, but I believe there are some fundamental differences between this play and the other pointing openings that favors 21$.

The score (after 0 games) is: WEISS 1, BLAU 2 (match to 3 points, Crawford game)

Move number 2: BLAU to play 21

WEISS	160
BLAU	167
Position ID: 4NvgATDgc/ABMA Match ID: 8AllABAAEAAA

• BLAU moves 24/23 13/11

#		Ply	Move	Equity
	1	R	13/11 6/5	-0.4365
			0.4430 0.1629 0.0244 - 0.5570 0.1612 0.0354 -0.4365 -0.4365 0.0013 0.0031 0.0015 - 0.0013 0.0011 0.0019 0.0037 0.0037
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 806469649 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	2	R	24/21	-0.4569 ( -0.0204)
			0.4386 0.1528 0.0214 - 0.5614 0.1671 0.0249 -0.4569 -0.4569 0.0011 0.0030 0.0014 - 0.0011 0.0011 0.0016 0.0031 0.0031
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 806469649 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	3	R	24/23 24/22	-0.4664 ( -0.0299)
			0.4352 0.1572 0.0186 - 0.5648 0.1684 0.0192 -0.4664 -0.4664 0.0011 0.0030 0.0013 - 0.0011 0.0011 0.0013 0.0029 0.0029
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 806469649 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
•	4	R	24/23 13/11	-0.4735 ( -0.0371)
			0.4360 0.1606 0.0256 - 0.5640 0.1727 0.0243 -0.4735 -0.4735 0.0011 0.0029 0.0018 - 0.0011 0.0011 0.0015 0.0028 0.0028
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 806469649 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	5	R	13/10	-0.4914 ( -0.0550)
			0.4207 0.1604 0.0286 - 0.5793 0.1664 0.0301 -0.4914 -0.4914 0.0013 0.0029 0.0017 - 0.0013 0.0011 0.0016 0.0032 0.0032
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 806469649 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]

I have XG rollouts for 31P-21 and 42P-21 at GS, but didn't even include slotting as a choice. So, I can't post them. it would probably be worth adding them just for comparison. I expect that slotting would not play well.

I would like to understand this much better than I do, but I believe that the reason 53P-21$ plays so well at GS is that it DOES try for an advanced anchor - indirectly. An advanced anchor often results after the slot is hit. This is less likely to develop after 31P and 42P since there is only one open point for an advanced anchor. Therefore slotting does not play as well.

Messages In This Thread

• Rollout of 53P-21 at Gammon Save
  Paul Weaver -- Monday, 26 July 2010, at 7:41 p.m.
  • 4 ply agrees
    neilkaz -- Monday, 26 July 2010, at 7:50 p.m.
    • How About 53P-21 at DMP?
      Paul Weaver -- Monday, 26 July 2010, at 7:54 p.m.
      • How About 53P-21 at DMP?
        neilkaz -- Monday, 26 July 2010, at 8:00 p.m.
        • Rollout - 53P-21-D
          Stick -- Monday, 26 July 2010, at 10:20 p.m.
    • 4 ply results
      neilkaz -- Tuesday, 27 July 2010, at 2:15 p.m.
  • Rollout of 53P-21 at Gammon Save
    Gregg Cattanach -- Tuesday, 27 July 2010, at 3:57 p.m.
    • Rollout of 53P-21 at Gammon Save
      David Rockwell -- Tuesday, 27 July 2010, at 7:51 p.m.
      • Rollout of 53P-21 at Gammon Save
        Casper van der Tak -- Tuesday, 27 July 2010, at 7:58 p.m.
        • Rollout of 53P-21 at Gammon Save
          David Rockwell -- Tuesday, 27 July 2010, at 8:30 p.m.