Perft for Checkers (again)

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Today I was prototyping a distributed worker pool at work which needed some test input, and this gave me a good excuse to compute perft for checkers for depth 21 (one deeper than results I posted a while back). The perft breakdown per move (called "divide") from the start position for depths 18 up to 21 is shown below.

move   divide(18)    divide(19)    divide(20)      divide(21)
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12-16: 550829166472  2517202147314 11531470109861  52945190026737
11-16: 566149929068  2564849953998 11736729175821  53527954221225
11-15: 435063007630  2041959240377  9515983205474  44775005468548
10-15: 472279451484  2180656975018 10055597639275  46574865098865
10-14: 402570639569  1859042884028  8600202424158  39822944739732
 9-14: 441590753001  2068865301476  9698986164172  45530585259776
 9-13: 625398758917  2881467090588 13406062152792  61923979665936
-----------------------------------------------------------------
      3493881706141 16114043592799 74545030871553 345100524480819

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