I was puzzled that 18/12 was so far down the list. Below are some variants to ponder. I welcome someone else to roll these out properly (shouldn't take long on a fast computer).
For money:
  White is Player 2
score: 0 pip: 72  Money session Jacoby  pip: 79 score: 0
Blue is Player 1  
XGID=BDABBBcBcccc:0:0:1:42:0:0:1:0:10 
Blue to play 42 
1.  XG Roller+  18/16 18/14  eq: 0.633 
 Player: Opponent:  30.42% (G:0.18% B:0.00%) 69.58% (G:0.80% B:0.01%)  

2.  XG Roller+  6/2 5/3  eq: 0.635 (0.003) 
 Player: Opponent:  30.05% (G:0.28% B:0.00%) 69.95% (G:0.55% B:0.01%)  

3.  XG Roller+  5/3 5/1  eq: 0.642 (0.009) 
 Player: Opponent:  29.50% (G:0.29% B:0.00%) 70.50% (G:0.37% B:0.00%)  

4.  XG Roller+  18/12  eq: 0.645 (0.012) 
 Player: Opponent:  30.22% (G:0.37% B:0.01%) 69.78% (G:0.80% B:0.01%)  

5.  XG Roller+  6/4 6/2  eq: 0.645 (0.012) 
 Player: Opponent:  29.81% (G:0.28% B:0.00%) 70.19% (G:0.45% B:0.01%)  

eXtreme Gammon Version: 1.21
Variant with White's outfield spare moved to her 6pt:
  White is Player 2
score: 0 pip: 68  Money session Jacoby  pip: 79 score: 0
Blue is Player 1  
XGID=BDABBBbBdccc:1:1:1:42:0:0:1:0:10 
Blue to play 42 
1.  XG Roller+  5/3 5/1  eq: 0.398 
 Player: Opponent:  26.06% (G:0.21% B:0.00%) 73.94% (G:0.32% B:0.00%)  

2.  XG Roller+  18/12  eq: 0.435 (0.037) 
 Player: Opponent:  24.74% (G:0.25% B:0.00%) 75.26% (G:0.75% B:0.01%)  

3.  XG Roller+  18/16 18/14  eq: 0.508 (0.110) 
 Player: Opponent:  21.67% (G:0.06% B:0.00%) 78.33% (G:0.72% B:0.01%)  

eXtreme Gammon Version: 1.21
Variant with closed board:
  White is Player 2
score: 0 pip: 72  Money session Jacoby  pip: 80 score: 0
Blue is Player 1  
XGID=BCBBBBcBcccc:0:0:1:42:0:0:1:0:10 
Blue to play 42 
1.  XG Roller+  18/12  eq: 0.570 
 Player: Opponent:  31.79% (G:0.62% B:0.01%) 68.21% (G:0.47% B:0.00%)  

2.  XG Roller+  18/16 18/14  eq: 0.571 (0.001) 
 Player: Opponent:  31.73% (G:0.34% B:0.01%) 68.27% (G:0.46% B:0.00%)  

3.  XG Roller+  6/4 6/2  eq: 0.579 (0.009) 
 Player: Opponent:  31.45% (G:0.37% B:0.01%) 68.55% (G:0.38% B:0.00%)  

eXtreme Gammon Version: 1.21
Variant with another dead checker:
  White is Player 2
score: 0 pip: 70  Money session Jacoby  pip: 79 score: 0
Blue is Player 1  
XGID=BDABBBcBccbd:0:0:1:42:0:0:1:0:10 
Blue to play 42 
1.  XG Roller+  6/2 5/3  eq: 0.636 
 Player: Opponent:  29.74% (G:0.31% B:0.01%) 70.26% (G:0.56% B:0.01%)  

2.  XG Roller+  18/12  eq: 0.638 (0.002) 
 Player: Opponent:  29.98% (G:0.48% B:0.01%) 70.02% (G:0.64% B:0.01%)  

3.  XG Roller+  6/4 6/2  eq: 0.642 (0.005) 
 Player: Opponent:  29.58% (G:0.33% B:0.01%) 70.42% (G:0.56% B:0.01%)  

4.  XG Roller+  18/16 18/14  eq: 0.655 (0.019) 
 Player: Opponent:  29.70% (G:0.17% B:0.00%) 70.30% (G:0.66% B:0.01%)  

5.  XG Roller+  5/3 5/1  eq: 0.660 (0.024) 
 Player: Opponent:  29.20% (G:0.30% B:0.00%) 70.80% (G:0.30% B:0.00%)  

eXtreme Gammon Version: 1.21