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Opening Replies: slotting vs. splitting for 21S-21, 41S-21, 51S-21, and 52S-21 at DMP and GG

Posted By: Igor
Date: Thursday, 26 June 2014, at 2:39 p.m.

My first topic on the subject of opening replies was a great success; Bob, David, and Nack shared their insight and I, and I'm pretty sure many others, have learned a new concept or two. As I'm going through the last draft version of reference tables, I'm checking the tables for accuracy as well as trying to understand the concepts behind certains moves. This is my second posting on this subject and it deals with 21 opening reply.

I have several questions related to slotting vs. splitting with an opening 21 reply to minor splits.

1. Why is slotting even on the radar for 21 reply against a minor split?

2. Why is slotting best against 41S and 51S, while it is very close to splitting against 21S and 52S at DMP?

Below are all related nacbracs:

21S-21 d[S U1 $1] "<31
21S-21 g[$ S8] "<31

41S-21 d[$ S5 W5] "<31
41S-21 g[$ S10] "<31

51S-21 d[$ U13 S19] "<20*15
51S-21 g[$ D25 U34 S38] "<15*10 5

52S-21 d[$ S2 H5] "<31
52S-21 g[$ H7 S16] "<31*20

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