Extend Reverse Grandsire Doubles

Accepted extension path EP4-1/0:1:1/0:1:1/0:1:1

EP4 Dual Mode Constraints

EP4 Dual Mode Derivation

  0 1 2 3 4 5 6 7
1. Reverse Grandsire Doubles 5 1 5 1 5 3
2. Extract places above the hunt bell 5 - 5 - - -
3. Extract places below the hunt bell - 1 - 1 - 3
Expand places above the hunt bell F E D C B A
4. Reverse and invert places from [2] - - - 1 - 1
5. Separate into two overlapping strips -
6. Using the start change and overlap - - - 1 - 1
7. Expand places above mode in [6] to next stage - - - 1 - 1
8. Connect the static [5] and expanded [7] strip - - - - 1 - 1
9. Reverse and invert places in [8] back again 7 - 7 - - - -
Expand places below the hunt bell A B C D E F
10. Below places from [3] - 1 - 1 - 3
11. Separate into two overlapping strips -
12. Using the start change and overlap - 1 - 1 - 3
13. Expand places above mode in [12] to next stage - 1 - 1 - 5
14. Connect the static [11] and the expanded [13] strip - - 1 - 1 - 5
Recombine above and below places A B B B B C D E
15. Above places from [9] 7 - 7 - - - -
16. Below places from [14] - - 1 - 1 - 5
17. Default hunt bell places - - - - - - 7 -
18. [Unnamed] Triples 7 7 127 7 1 7 567 7

Extension and contraction candidates using extension process EP4-2/0:1:1/0:1:1   Equivalent to accepted extension path

g 12534 Reverse Grandsire Doubles 5,1.5.1.5.3
3572614 [Unnamed] Triples 7,7.127.7.1.7.567.7
896347251 [Unnamed] Caters 9,9.9.1.9.1.9.7.9.9
97E56301824 [Unnamed] Differential Cinques E,E.E.E.1.E.1.E.9.E.E.E
806T4A271E395 [Unnamed] Sextuples A,A.A.A.A.1.A.1.A.E.A.A.A.A
97E5A3C102B4T68 [Unnamed] Differential Septuples C,C.C.C.C.C.1.C.1.C.A.C.C.C.C.C
Doubles Triples Caters Cinques Sextuples Septuples
Reverse Grandsire Doubles [Unnamed] Triples [Unnamed] Caters [Unnamed] Differential Cinques [Unnamed] Sextuples [Unnamed] Differential Septuples