to answer Dr. Kister's question, the answer is no.

Q:if we add HB info, can we detect a position to cut?

A:Nop

===================
in 1bfg, these three sets of residues all have correct H-Bonds

8 5 9 10: 96,94,63,65,106,104,139,141: fit! yes
1 4 10 9: 23,21,53,55,141,139,104,106: fit! yes
5 8 4 1: 65,63,94,96,55,53,21,23: fit! yes
-----------------------------------------------------
1swu "A"
8 7 1 2: 130,128,106,108,23,21,29,31: fit! yes
which is not same as Martin's
Martin's is 4 3 5 6: 56,54,43,45,79,77,90,92
-----------------------------------------------------
1efc A
22 19 21 20: 363,361,302,304,339,337,330,332: fit! no
20 21 23 24: 332,330,337,339,376,374,386,388: fit! HB yes, position no.
24 23 19 22: 388,386,374,376,306,304,360,362: fit! yes
---------: fit!
21 20 22 19: 339,337,330,332,362,360,304,306: fit! yes
19 22 24 23: 306,304,359,361,388,386,374,376: fit! HB yes, position no.
19 22 24 23: 306,304,360,362,388,386,374,376: fit! yes

Martin
select 362,360,304,306,339,337,330,332; color yellow;