#N adjustable-slope-spaceships.rle
#O AforAmpere, 23 July 2018
#C
#C The isotropic rule has a 3-cell c/2 orthogonal spaceship and a
#C still life dot. Interestingly, one of the spaceship+dot collisions
#C displaces a dot by (2,0) and reflects the spaceship to the adjacent
#C lane. This allows for spaceships with adjustable slopes to be made.
#C
#C The spaceships demonstrated in this pattern has the following
#C speeds respectively, from left to right:
#C
#C   (10,2)c/324, slope 10/2=5;
#C   (8,2)c/260, slope 8/2=4;
#C   (6,2)c/196, slope 6/2=3;
#C   (4,2)c/132, slope 4/2=2;
#C   (8,6)c/460, slope 8/6=4/3.
#C
#C Apart from these, orthogonal (slope=0) and diagonal (slope=1)
#C spaceships are also possible. Note how the first four make use of
#C two smaller 2c/64 orthogonal ones at the top and bottom; by
#C adjusting the distance d of two dots, it attains all orthogonal
#C speeds of the form 2c/(4d-12) for d>= 6.
#C
#C Reference:
#C https://conwaylife.com/forums/viewtopic.php?f=11&t=3081&post=62131#p62131
#C
#C For other small adjustable spaceships in various rules, see
#C https://conwaylife.com/forums/viewtopic.php?f=11&t=3081
x = 205, y = 88, rule = B2ce3cen4ekt6kn/S01c2ae4cknr5akn
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o19bobo17bo61bo$19bobo37bobo37bobo37bobo59bobo4$170bobo$171bo26$123bo$
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o$98bo13$43bo$50bo11bo$51bo$50bo13$22bo$3bo12bo$15bo$16bo!