User avatar
admin
Site Admin
Posts: 343
Joined: Sun Oct 24, 2010 8:32 pm
Years playing backgammon: 20+ Learned to play on fibs.com playing bots and review with gnubg analysis FIBS rating 1750-1850
Location: USA

tempo hit / match score matters..

Here is a position from YouTube video "Northwest Indiana Backgammon Association, December 2022 Monthly Tournament. Charlie v. Dujuan Round 1"


Position on video is at 24 :43

White on roll to play 6-1
5 pt match score 1-2 white trailing
pips 114 / 128

Image

So white played 10 -3 which seemed like a reasonable move but xg analysis threw a fit, got all twisted and declared a 4x blunder :o gnubg rollout concurs

gnubg 4 ply likes 7/1* 6/5 as did XG but gnubg rollout prefers 24/23 7/1* close only -.034 diff

But look what happens when the scores are reversed.
If you are leading 2-1 you definitely DON'T want to leave 2 blots in your home board. rollout says it would be .108 blunder.

Tricky position in particular the score aspect

This kind of hit on the ace pt 7/1 is known in backgammon lingo as a "tempo hit" which the 7/1 hit on the ace pt is a good example of such a move. The term is explained nicely at https://thegammonpress.com/backgammon-l ... tempo-hit/ with a good explanation of when to use it and when not to use it.


=============================== gnubg 4 ply and rollouts for both scores==============

======12===============================

1. Cubeful 4-ply 7/1* 6/5 Eq.: -0.075
0.393 0.208 0.006 - 0.607 0.202 0.020

2. Cubeful 4-ply 24/23 7/1* Eq.: -0.087 ( -0.011)
0.395 0.190 0.005 - 0.605 0.161 0.015

3. Cubeful 4-ply 10/4 6/5 Eq.: -0.294 ( -0.218)
0.371 0.148 0.005 - 0.629 0.149 0.009

4. Cubeful 4-ply 10/9 7/1* Eq.: -0.347 ( -0.272)
0.360 0.158 0.004 - 0.640 0.156 0.012

5. Cubeful 4-ply 7/1* 2/1 Eq.: -0.393 ( -0.318)
0.347 0.156 0.003 - 0.653 0.164 0.013

6. Cubeful 4-ply 24/23 10/4 Eq.: -0.395 ( -0.319)
0.368 0.111 0.003 - 0.632 0.129 0.006

7. Cubeful 4-ply 7/6 7/1* Eq.: -0.413 ( -0.338)
0.349 0.140 0.003 - 0.651 0.142 0.009

8. Cubeful 4-ply 10/3 Eq.: -0.485 ( -0.409)
0.337 0.106 0.003 - 0.663 0.135 0.007




==================

1. Rollout 24/23 7/1* Eq.: -0.024
0.403 0.197 0.013 - 0.597 0.168 0.020 CL -0.086 CF -0.024


2. Rollout 7/1* 6/5 Eq.: -0.059 ( -0.034)
0.391 0.204 0.008 - 0.609 0.203 0.031 CL -0.312 CF -0.059


3. Rollout 10/4 6/5 Eq.: -0.268 ( -0.244)
0.371 0.156 0.009 - 0.629 0.154 0.013 CL -0.271 CF -0.268


4. Rollout 10/9 7/1* Eq.: -0.322 ( -0.297)
0.366 0.165 0.008 - 0.634 0.155 0.015 CL -0.292 CF -0.322


5. Rollout 7/1* 2/1 Eq.: -0.379 ( -0.354)
0.353 0.165 0.008 - 0.647 0.166 0.017 CL -0.338 CF -0.379


6. Rollout 7/6 7/1* Eq.: -0.385 ( -0.361)
0.355 0.148 0.005 - 0.645 0.144 0.013 CL -0.318 CF -0.385


7. Rollout 24/23 10/4 Eq.: -0.430 ( -0.406)
0.365 0.116 0.005 - 0.635 0.134 0.007 CL -0.302 CF -0.430


8. Rollout 10/3 Eq.: -0.475 ( -0.451)
0.340 0.116 0.007 - 0.660 0.136 0.007 CL -0.369 CF -0.475




////////////////////////////////////////////21//////////////////////////////////////////

1. Cubeful 4-ply 24/23 7/1* Eq.: -0.508
0.397 0.191 0.005 - 0.603 0.162 0.015

2. Cubeful 4-ply 24/23 10/4 Eq.: -0.585 ( -0.077)
0.368 0.117 0.004 - 0.632 0.131 0.006

3. Cubeful 4-ply 10/4 6/5 Eq.: -0.626 ( -0.118)
0.371 0.156 0.006 - 0.629 0.150 0.009

4. Cubeful 4-ply 7/1* 6/5 Eq.: -0.688 ( -0.180)
0.393 0.208 0.006 - 0.607 0.201 0.019

5. Cubeful 4-ply 10/9 7/1* Eq.: -0.700 ( -0.192)
0.361 0.158 0.004 - 0.639 0.154 0.011

6. Cubeful 4-ply 7/6 7/1* Eq.: -0.716 ( -0.208)
0.350 0.138 0.003 - 0.650 0.140 0.009

7. Cubeful 4-ply 10/3 Eq.: -0.784 ( -0.276)
0.338 0.109 0.004 - 0.662 0.135 0.006

8. Cubeful 4-ply 7/1* 2/1 Eq.: -0.815 ( -0.307)
0.347 0.155 0.003 - 0.653 0.161 0.012



======================

1. Rollout 24/23 7/1* Eq.: -0.412
0.410 0.208 0.022 - 0.590 0.167 0.039 CL -0.323 CF -0.412


2. Rollout 7/1* 6/5 Eq.: -0.519 ( -0.108)
0.408 0.225 0.019 - 0.592 0.195 0.072 CL -0.363 CF -0.519


3. Rollout 24/23 10/4 Eq.: -0.572 ( -0.160)
0.377 0.146 0.016 - 0.623 0.143 0.016 CL -0.409 CF -0.572


4. Rollout 10/4 6/5 Eq.: -0.598 ( -0.186)
0.380 0.181 0.019 - 0.620 0.163 0.033 CL -0.407 CF -0.598


5. Rollout 7/6 7/1* Eq.: -0.607 ( -0.195)
0.366 0.162 0.014 - 0.634 0.144 0.020 CL -0.409 CF -0.607


6. Rollout 10/9 7/1* Eq.: -0.610 ( -0.198)
0.377 0.178 0.016 - 0.623 0.160 0.035 CL -0.403 CF -0.610


7. Rollout 10/3 Eq.: -0.731 ( -0.319)
0.354 0.141 0.015 - 0.646 0.148 0.017 CL -0.465 CF -0.731
DOWNLOAD GREEDYGAMMON
No registration required!
Install and play backgammon against the computer!
Detailed how to installation guide with screenshots
Check out backgammonforums.com another nice bg forum

Return to “Position Analysis”