There are as many sets of boards in a Howell movement as there are pairs minus one (equal to the number of rounds). There are only as many sets in play as there are tables (using a standard Howell with no shares). There are some (the number of table minus one) sets of boards not in play on each round.
If a second Howell movement is placed on this set of boards, using the boards out of play in the first Howell, then only 1 table needs to share boards to allow 2 Howell movements of the same number of tables using the same boards.
This movement is valuable in a two-session event where the field is divided into 2 groups of pairs and in the first session a Mitchell movement is used so that the two groups meet each other. In the second session the double Howell is used so that each group meets the pairs in its group.
An examination of the list of all the 4 table Howell movements reveals that the first two Howell movements will combine to give a double Howell.
Board sets 1 2 3 4 5 6 7
Howell 1 8-1 6-5 4-2 7-4
Howell 2 1-8 2-6 5-7 3-4
Table 1 & 1A 2 3 4 5 6 7
Full expansions:
Table 1 & 1A Table 2 Table 3 Table 4 Table 5 Table 6 Table 7
Round 1 8-1 6-5 4-2 7-3
1 2 3 4 5 6 7
1-8 2-6 5-7 3-4
Round 2 8-2 7-6 5-3 1-4
2 3 4 5 6 7 1
2-8 3-7 6-1 4-5
Round 3 8-3 1-7 6-4 2-5
3 4 5 6 7 1 2
3-8 4-1 7-2 5-6
Round 4 8-4 2-1 7-5 3-6
4 5 6 7 1 2 3
4-8 5-2 1-3 6-7
Round 5 8-5 3-2 1-6 4-7
5 6 7 1 2 3 4
5-8 6-3 2-4 7-1
Round 6 8-6 4-3 2-7 5-1
6 7 1 2 3 4 5
6-8 7-4 3-5 1-2
Round 7 8-7 5-4 3-1 6-2
7 1 2 3 4 5 6
7-8 1-5 4-6 2-3
The other useful double Howell movements are:
DOUBLE 5 TABLE HOWELL
10-1 9-8 6-4 4R 3-7 5-2
3R 3-7 5-2 1-10 9-8 6-4 R
Unfortunately it is impossible for the 2 tables with the stationary pairs to share boards in a 5 table double Howell.
DOUBLE 6 TABLE HOWELL
12-1 R 10-7 3R 5-4 9-11 3-8 R 6-2
1-12 11-7 R 5-10 2-4 9-8 3R 6-3 R
DOUBLE 7 TABLE HOWELL
14-1 5R 2-8 12-11 5-7 9-4 3-13 R 6-10
14-1 10-7 4-12 8-6 3-2 9-13 5R 11-5 R
DOUBLE 8 TABLE HOWELL
16-1 5-9 7-13 15-10 3-2 14-11 6-8 2R 4-12 5R
1-16 6R 7-9 13-2 R 8-14 6-3 5-15 4-12 11-10
DOUBLE 9 TABLE HOWELL
18-1 12-7 6-16 3-5 9-17 14-13 5R 4-10 15-2 11-8 3R
1-18 5R 6-8 11-15 7-13 4-16 3-2 3R 17-10 12-9 14-5
DOUBLE 10 TABLE HOWELL
20-1 9-17 16-11 3-5 2R 19-10 14-13 6-18 8-12 15-2 7-4 7R
1-20 3R 16-11 5-7 6R 17-8 4-3 12-18 9-2 15-19 6-14 13-10
An alternative approach to the double Howell is to place two Howell movements beside each other so that they share boards throughout the movement. The advantage of this is that the scoring can be done during play as the boards come out after the same number of rounds as in standard Howell.
For example, a 5 Table Howell (doubled up):
By using this in the interwoven movement, the problem of 2 groups of 9 pairs is solved. The Mitchell skips the first round and these pairs meet each other at table 1 in the double Howell.
With the one particular Howell for 6 tables that has 3 shares, it is possible (when playing 33 boards) to have 2 or 3 consecutive Howell movements while still using only one set of boards. The arrangement is as follows:
Movement 1 Movement 2 Movement 3
10-6 12-1 5-7 30-26 32-21 25-27 50-46 52-41 45-47
R R
4-9 3-2 8-11 24-29 23-22 28-31 44-49 43-42 48-51
Each Howell moves within itself, while the boards move as normal, down one table. The director has to be careful to change the score sheets (when scoring each section separately) as the boards move from one section to another (especially when there is no relay table where the sheets can be exchanged). The advantage of this movement is the low number of boards needed and the possibility of scoring all three sections after 3 rounds when scoring the sections separately.
A similar, though not as effective, movement for 5 tables is:
Movement 1 Movement 2
5-2 R 10-1 4-6 R 2-5 R 1-10 6-4
9-8 3-7 8-9 7-3
