| Thanks for the update, Nack.
As readers of the BGO Online Match are painfully aware, I am an intermediate player, just beginning to learn openings and replies. If you ignore the playing I did prior to 1989, when I followed the Barclay Cooke school of lead-with-your-chin (and then play a backgame), I have only been playing for about 2 years, since November 2009. Currently, I am in the process of studying the replies to 21S, 41S and 51S. This thread is very useful because it quantifies the relationship between the three plays 21S-43X, 41S-43X and 51S-43X. Previously, this is a relationship I had only noted qualitatively. Your succinct summary says it all: The more potent and the more exposed White's builder, the more incentive Blue has to hit (anywhere). X goes from fifth place, to tied, to clearly best. Just to fill in the gap, I made a rollout of 31S-43. There are no surprises, though. X is very nearly tied with the leader S, while Z is very close in fourth place. I think S is coming in ahead of X and Z because the latter pair both present the opponent with a good 6, while S does not. Based on the X-Z relationship, this rollout comes right after 21S-43, but before 41S-43. – 51S-43 – [U D7 S9 Z12 X17] Does this mean that a 10pt builder gives more benefit to White on the opening roll than one on the 11pt? More generally, does the X-Z ordering above gives us the value of the builder in each position? I guess that is the accepted wisdom. This is a question I am interested in. By the way, do the two Snowie nacbracs you report share the same seed? That is, is the latter an extension of the former? Message –83652: – 41S-43 – [X Z31 S42 D49 U60 H88] ~10*5 Mike |
[S X6.9 D14.3 Z18.9 H47.7 U64.1] "<=20*10
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eXtreme Gammon Version: 2.01