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25 Problems

by Hirofumi Fujiwara (Japan)

I solved many patterns of sliding piece puzzle about 20 years ago. Now, I'm glad to show you 25 problems. You can accustom to Sliding Piece Puzzle by these exercised.

In those days, I solved these problems by hand, and some of their shortest steps were wrong. I solved all of them by my program.

No.1
10 steps
No.2
10 steps
No.3
14 steps
No.4
15 steps
No.5
16 steps
No.6
19 steps
No.7
24 steps
No.8
25 steps
No.9
26 steps
No.10
27 steps
No.11
30 steps
No.12
32 steps
No.13
33 steps
No.14
36 steps
No.15
43 steps
No.16
43 steps
No.17
45 steps
No.18
57 steps
No.19
58 steps
No.20
60 steps
No.21
61 steps
No.22
62 steps
No.23
70 steps
No.24
85 steps
No.25
101 steps