Replies to 13/10, 13/8

Best
Nearly Best
Pretty Good
Not So Good
Here are White's best replies after Red opens 13/10, 13/8.

The EQUITY column shows the estimated cubeless equity of each potential play. The best play is displayed with a white background and the other plays are displayed with progressively darker backgrounds to give a rough idea of the amount of equity lost. Plays that give up more than 0.05 in cubeless equity are not listed at all.

The VOTES column indicates the recommendations of some selected experts:

      D = Joe Dwek, in Backgammon for Profit (1975).
      R = Bill Robertie, in Inside Backgammon, Volume 8 (1998).

The check marks denote the best play for each of the following situations:

  • Cubeless (CL): Cubeless money play.
  • Double Match Point (DMP): In a match which has come down to one final game.
  • Gammon-Go (GG): When aggressively going for a gammon win.
  • Gammon-Save (GS): When aggressively avoiding a gammon loss.

   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  8/7(2), 6/5(2)   + .570, .173, .008
  − .430, .133, .007
 +.183   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/11, 6/5   + .474, .133, .005
  − .526, .172, .012
 −.098   RD
  24/23, 13/11   + .462, .125, .005
  − .538, .170, .007
 −.121   (.023) (.022) (.037) (.018)
  13/10   + .454, .127, .005
  − .546, .169, .009
 −.137   (.039) (.039) (.050) (.033)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/11(2), 6/4(2)   + .552, .172, .008
  − .448, .138, .007
 +.141   R (.063)
  24/22(2), 6/4(2)   + .544, .154, .006
  − .456, .107, .004
 +.136   (.005) (.017) (.054) (.018)
  13/9, 6/4(2)   + .538, .167, .008
  − .462, .139, .007
 +.106   (.035) (.028) (.040) (.092)
  24/20(2)   + .530, .126, .004
  − .470, .085, .002
 +.103   D (.037) (.044) (.137)
  24/22, 13/11, 6/4(2)   + .540, .159, .008
  − .460, .137, .006
 +.102   (.039) (.025) (.053) (.087)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  8/5, 6/5   + .529, .163, .007
  − .471, .143, .007
 +.077   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/21, 13/11   + .471, .126, .006
  − .529, .168, .008
 −.102   (.010)
  13/11, 13/10   + .464, .138, .006
  − .536, .166, .010
 −.103   R (.001) (.013) (.008)
  24/22, 13/10   + .463, .124, .005
  − .537, .167, .007
 −.119   (.017) (.015) (.030) (.013)
  13/10, 6/4   + .460, .127, .005
  − .540, .178, .012
 −.137   D (.035) (.021) (.030) (.040)
  13/11, 8/5   + .458, .132, .005
  − .542, .179, .012
 −.138   (.036) (.026) (.024) (.047)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/21(2), 8/5(2)   + .558, .169, .006
  − .442, .092, .003
 +.194   D (.013) (.058) (.013)
  24/21(2), 6/3(2)   + .560, .154, .005
  − .440, .088, .003
 +.188   (.007) (.008) (.084)
  8/5(2), 6/3(2)   + .561, .194, .010
  − .439, .133, .007
 +.187   (.007) (.005) (.087)
  24/15*, 13/10   + .564, .158, .009
  − .436, .121, .005
 +.169   R (.026) (.068) (.057)
  24/21(2), 13/10(2)   + .553, .150, .005
  − .447, .090, .003
 +.168   (.026) (.022) (.106) (.017)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/9, 6/5   + .472, .133, .006
  − .528, .173, .012
 −.102   D
  24/23, 13/9   + .462, .131, .006
  − .538, .170, .008
 −.117   R (.015) (.020) (.025) (.015)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  8/4, 6/4   + .502, .154, .007
  − .498, .153, .008
 +.004   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/10, 13/9   + .471, .142, .006
  − .529, .165, .010
 −.085   RD (.005)
  24/21, 13/9   + .473, .133, .007
  − .527, .172, .008
 −.095   (.010) (.014) (.011)
  24/20, 13/10   + .463, .123, .006
  − .537, .166, .007
 −.119   (.034) (.020) (.054) (.018)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/20(2), 13/9(2)   + .595, .157, .005
  − .405, .069, .002
 +.282   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/8, 6/5   + .465, .127, .005
  − .535, .167, .009
 −.115   RD
  24/23, 13/8   + .457, .122, .005
  − .543, .164, .006
 −.128   (.013) (.015) (.025) (.008)
  24/18   + .462, .111, .005
  − .538, .168, .006
 −.135   (.020) (.006) (.039) (.007)
  13/7   + .449, .124, .005
  − .551, .169, .009
 −.150   (.035) (.030) (.036) (.033)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/11, 13/8   + .461, .131, .006
  − .539, .168, .008
 −.117   R (.001) (.010)
  24/22, 13/8   + .462, .119, .005
  − .538, .164, .006
 −.122   (.005) (.023)
  13/8, 6/4   + .457, .125, .005
  − .543, .170, .009
 −.135   D (.018) (.009) (.021) (.022)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  8/3, 6/3   + .482, .149, .007
  − .518, .163, .008
 −.052   R
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/15*   + .546, .143, .007
  − .454, .128, .005
 +.109   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/3(2)   + .502, .161, .008
  − .498, .151, .006
 +.015   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  13/7, 8/7   + .503, .142, .006
  − .497, .153, .007
 −.005   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/18, 13/11   + .474, .120, .005
  − .526, .166, .007
 −.100   R
  24/16   + .467, .113, .005
  − .533, .172, .007
 −.127   (.027) (.014) (.028) (.025)
  13/5   + .456, .131, .005
  − .544, .169, .010
 −.130   D (.030) (.035) (.014) (.040)
  13/11, 13/7   + .457, .132, .006
  − .543, .174, .011
 −.133   (.033) (.033) (.008) (.049)
  24/22, 24/18   + .460, .110, .005
  − .540, .179, .006
 −.149   (.049) (.027) (.046) (.053)
  24/22, 13/7   + .452, .122, .005
  − .548, .173, .008
 −.149   (.049) (.043) (.038) (.057)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/15*   + .546, .143, .007
  − .454, .128, .005
 +.109   RD
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/18, 13/9   + .474, .127, .006
  − .526, .166, .007
 −.093   R (.002)
  24/14   + .472, .112, .005
  − .528, .164, .005
 −.108   D (.015) (.003) (.034)
  8/2, 6/2   + .453, .140, .006
  − .547, .172, .008
 −.129   (.036) (.042) (.017) (.055)
  13/9, 13/7   + .457, .136, .006
  − .543, .174, .012
 −.132   (.039) (.034) (.017) (.052)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/13   + .486, .106, .004
  − .514, .150, .005
 −.072   RD (.007)
  24/18, 13/8   + .477, .119, .005
  − .523, .159, .005
 −.087   (.014) (.018) (.035)
   PLAY W      G     BG     EQUITY VOTES CL DMP GG GS
  24/18(2), 13/7(2)   + .625, .149, .006
  − .375, .081, .002
 +.322   RD

Summary

Rolls in order from luckiest to unluckiest, and calculation of average equity.

(+.326) 24/18(2), 13/7(2) +.322 × 1  =   +.322
(+.286) 24/20(2), 13/9(2) +.282 × 1  =   +.282
(+.198) 24/21(2), 8/5(2) +.194 × 1  =   +.194
(+.187) 8/7(2), 6/5(2) +.183 × 1  =   +.183
(+.145) 13/11(2), 6/4(2) +.141 × 1  =   +.141
(+.113) 24/15* +.109 × 2  =   +.218
(+.113) 24/15* +.109 × 2  =   +.218
(+.082) 8/5, 6/5 +.077 × 2  =   +.155
(+.019) 13/3(2) +.015 × 1  =   +.015
(+.008) 8/4, 6/4 +.004 × 2  =   +.007
(−.001) 13/7, 8/7 −.005 × 2  =   −.010
(−.048) 8/3, 6/3 −.052 × 2  =   −.105
(−.068) 24/13 −.072 × 2  =   −.145
(−.080) 13/10, 13/9 −.085 × 2  =   −.169
(−.089) 24/18, 13/9 −.093 × 2  =   −.186
(−.094) 13/11, 6/5 −.098 × 2  =   −.196
(−.096) 24/18, 13/11 −.100 × 2  =   −.201
(−.098) 13/9, 6/5 −.102 × 2  =   −.204
(−.098) 24/21, 13/11 −.102 × 2  =   −.204
(−.111) 13/8, 6/5 −.115 × 2  =   −.230
(−.113) 13/11, 13/8 −.117 × 2  =   −.235
  ———
  White's Average Equity −.151  ÷  36  =  −.004

 

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