Some perft() results for that alternative test position

[sje]

Hera are some perft() results for the symmetric alternative test position presented earlier:
[d]

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perft(0):                   1
perft(1):                  46
perft(2):               2,079
perft(3):              89,890
perft(4):           3,894,594
perft(5):         164,075,551
perft(6):       6,923,051,137
perft(7):     287,188,994,746
perft(8):  11,923,589,843,526
perft(9): 490,154,852,788,714

The perft(9) calculation needed 10h21m.

These could be added to the wiki.

Can anyone extend this list?

[ankan]

perft_gpu agrees with your numbers:

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GPU Perft 1: 46,   Time taken: 6.9856e-005 seconds, nps: 658497

GPU Perft 2: 2079,   Time taken: 0.000269824 seconds, nps: 7705022

GPU Perft 3: 89890,   Time taken: 0.000533344 seconds, nps: 168540388

GPU Perft 4: 3894594,   Time taken: 0.000929376 seconds, nps: 4190547178

GPU Perft 5: 164075551,   Time taken: 0.0102988 seconds, nps: 15931595759

GPU Perft 6: 6923051137,   Time taken: 0.244653 seconds, nps: 28297419405

GPU Perft 7: 287188994746,   Time taken: 3.79618 seconds, nps: 75652088285

GPU Perft 8: 11923589843526,   Time taken: 75.3017 seconds, nps: 158344258135

GPU Perft 9: 490154852788714,   Time taken: 1597.06 seconds, nps: 306910299074

GPU Perft 10: 20155532500692989,   Time taken: 41233 seconds, nps: 488820660080

[hgm]

I am not sure this alternative position has any merits. There are no castling rights at all, and promotions are still far away. So it has similar or even worse problems than the standard opening position. It would be much better to have a position where both castlings (of all types) and promotions are nearby, such as KiwiPete.

[Ajedrecista]

Hello Muller:

I am not sure this alternative position has any merits. There are no castling rights at all, and promotions are still far away. So it has similar or even worse problems than the standard opening position. It would be much better to have a position where both castlings (of all types) and promotions are nearby, such as KiwiPete.

Your proposal was first written by Ben Nye in this post and I shared some results in this other post. That topic can be easily searched via CPW under the section Forum Posts (date: 11th July, 2013).

Regards from Spain.

Ajedrecista.

[Henk]

I still have a bug in en passent. I only encounter it once a week or so.
So there exists some positions where my opponent makes an en passent and my program invalidates it and I cannot make the move. Maybe I should detect en passent in a different way and compare it with my current implementation.

I have not implemented perft yet. Perhaps to lazy for that. Of gewoon geen zin.

[sje]

I am not sure this alternative position has any merits. There are no castling rights at all, and promotions are still far away. So it has similar or even worse problems than the standard opening position. It would be much better to have a position where both castlings (of all types) and promotions are nearby, such as KiwiPete.

The motivation for the above position is to test perft() operations equally distributed among all piece kinds. The focus is more on typical complex middlegame positions and not on special moves; there are already plenty of test positions for those.