Number field checks according to the drawing. The shortest solution is 126 moves, which are necessary for executing in the following order:
10-11 18-10 11-15 16-18 21-14 22-13 17-12 6-17 12-22 13-21 8-6 21-8 22-13 6-22 13-21 14-16 15-6 10-11 5-12 4-13 3-14 20-3 14-4 13-5 8-20 5-8 4-13 9-14 3-15 2-9 15-2 20-3 14-4 13-5 18-20 5-18 4-13 9-14 3-15 2-10 1-9 10-1 15-2 20-3 14-4 13-5 12-10 11-20 16-15 21-14 6-13 22-12 23-6 17-11 24-17 11-24 12-23 13-22 8-21 18-16 14-11 15-12 10-18 5-8 4-13 9-14 3-15 2-10 7-9 10-7 15-2 20-3 14-20 13-4 12-5 11-10 6-15 16-14 21-13 22-12 17-6 23-11 24-16 19-17 16-19 11-24 12-23 13-22 8-21 6-8 21-13 22-12 17-6 23-11 24-16 25-17 16-25 11-24 12-23 13-22 18-21 6-18 21-13 22-12 17-6 12-17 13-22 14-21 15-16 20-11 10-12 5-13 4-20 13-4 18-5 20-18 5-13 4-14 9-20 14-9 13-4 8-5 12-10 11-15 16-8 15-16.
Next Main, Puzzles, About me, My books, Write me, Links
10-11 18-10 11-15 16-18 21-14 22-13 17-12 6-17 12-22 13-21 8-6 21-8 22-13 6-22 13-21 14-16 15-6 10-11 5-12 4-13 3-14 20-3 14-4 13-5 8-20 5-8 4-13 9-14 3-15 2-9 15-2 20-3 14-4 13-5 18-20 5-18 4-13 9-14 3-15 2-10 1-9 10-1 15-2 20-3 14-4 13-5 12-10 11-20 16-15 21-14 6-13 22-12 23-6 17-11 24-17 11-24 12-23 13-22 8-21 18-16 14-11 15-12 10-18 5-8 4-13 9-14 3-15 2-10 7-9 10-7 15-2 20-3 14-20 13-4 12-5 11-10 6-15 16-14 21-13 22-12 17-6 23-11 24-16 19-17 16-19 11-24 12-23 13-22 8-21 6-8 21-13 22-12 17-6 23-11 24-16 25-17 16-25 11-24 12-23 13-22 18-21 6-18 21-13 22-12 17-6 12-17 13-22 14-21 15-16 20-11 10-12 5-13 4-20 13-4 18-5 20-18 5-13 4-14 9-20 14-9 13-4 8-5 12-10 11-15 16-8 15-16.