Still looking for the engine that can analyze this position

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Dann Corbit
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Still looking for the engine that can analyze this position

Post by Dann Corbit » Wed Dec 01, 2010 9:20 am

[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.

Milos
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Re: Still looking for the engine that can analyze this posit

Post by Milos » Wed Dec 01, 2010 9:31 am

Dann Corbit wrote:What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
I thought it's quite obvious, at least for human, mate in 32. First move doesn't matter.

bhlangonijr
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Re: Still looking for the engine that can analyze this posit

Post by bhlangonijr » Wed Dec 01, 2010 10:12 am

Dann Corbit wrote:[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
Stockfish crashes instantly with this position. My RedQueen doesn't crash, but the search gets so slow that you have to wait for a looooong time to see the first iteration completed. Anyway I haven't waited to see it completed, I just forced a bestmove response with the stop command. :)

As the board is all filled with queens you don't have a bad capture to prune and every call to quies search gets too busy also because you have long capture sequences. Anyway it's an interesting position.

Thanks!

Code: Select all

Redqueen. Copyright (C) 2008-2010 Ben-Hur Carlos Vieira Langoni Junior. 
position fen qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -
go infinite
stop
info currmove a4a5 currmovenumber 1
info depth 1 seldepth 0
info depth 1 score cp 0 upperbound time 598180 nodes 492670259 nps 823863 pv a4a5
info nodes 492670259 time 598180 nps 823863 hashfull 1000
info currmove a4b5 currmovenumber 2
info currmove b4a5 currmovenumber 3
info currmove b4b5 currmovenumber 4
info currmove b4c5 currmovenumber 5
info currmove c4b5 currmovenumber 6
info currmove c4c5 currmovenumber 7
info currmove c4d5 currmovenumber 8
info currmove d4c5 currmovenumber 9
info currmove d4d5 currmovenumber 10
info currmove d4e5 currmovenumber 11
info currmove e4d5 currmovenumber 12
info currmove e4e5 currmovenumber 13
info currmove e4f5 currmovenumber 14
info currmove f4e5 currmovenumber 15
info currmove f4f5 currmovenumber 16
info currmove f4g5 currmovenumber 17
info currmove g4f5 currmovenumber 18
info currmove g4g5 currmovenumber 19
info currmove g4h5 currmovenumber 20
info currmove h4g5 currmovenumber 21
info currmove h4h5 currmovenumber 22
info depth 1 seldepth 0 nodes 492670259
info currmove a4a5 currmovenumber 1
info depth 2 seldepth 0
info depth 2 score cp 0 upperbound time 598180 nodes 492670259 nps 823863 pv a4a5
info nodes 492670259 time 598180 nps 823863 hashfull 1000
info currmove a4b5 currmovenumber 2
info currmove b4a5 currmovenumber 3
info currmove b4b5 currmovenumber 4
info currmove b4c5 currmovenumber 5
info currmove c4b5 currmovenumber 6
info currmove c4c5 currmovenumber 7
info currmove c4d5 currmovenumber 8
info currmove d4c5 currmovenumber 9
info currmove d4d5 currmovenumber 10
info currmove d4e5 currmovenumber 11
info currmove e4d5 currmovenumber 12
info currmove e4e5 currmovenumber 13
info currmove e4f5 currmovenumber 14
info currmove f4e5 currmovenumber 15
info currmove f4f5 currmovenumber 16
info currmove f4g5 currmovenumber 17
info currmove g4f5 currmovenumber 18
info currmove g4g5 currmovenumber 19
info currmove g4h5 currmovenumber 20
info currmove h4g5 currmovenumber 21
info currmove h4h5 currmovenumber 22
info depth 2 seldepth 0 nodes 492670259
info depth 2 seldepth 0
info depth 2 score cp 0 time 598180 nodes 492670259 nps 823863 pv a4a5
info nodes 492670259 time 598180 nps 823863 hashfull 1000
bestmove a4a5


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hgm
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Re: Still looking for the engine that can analyze this posit

Post by hgm » Wed Dec 01, 2010 12:00 pm

I like this one better:

[d]1b1bkb1b/b1b1b1b1/1b1b1b1b/b1b1b1b1/1b1b1b1b/b1b1b1b1/1b1b1b1b/b1bKbBb1 w

Also a lot easier to analyze. (White wins, of course.)

I don't think it is realistic to assume an engine could be built that could analyze your all-Queens position. That would be about as complicated as searching all the way to checkmate from the FIDE opening. The first 30 moves or so of any sensible variant will all consist of captures, so the material score is quite meaningless. Only after the first 30 captures you will have any idea if you have been doing well, or not (when you suddenly run out of captures, and are a Queen down). That means you basically have nothing to go on. (Perhaps maximizing the number of captures would do some good?)

Even with perfect move ordering and obligatory capture the game tree would be way too big to get a meaningful root score.

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Kirk
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Re: Still looking for the engine that can analyze this posit

Post by Kirk » Wed Dec 01, 2010 5:33 pm

Dann Corbit wrote:[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
I wonder if a pure brute-force engine would not get all tied up in knots?

I will try it with an earlier version of Spike :)

Only have SCID at the office. Will not let me do that :lol:

http://spike.lazypics.de/downloads/spike_09a.zip
http://spike.lazypics.de/downloads/spike_07.zip
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George Tsavdaris
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Re: Still looking for the engine that can analyze this posit

Post by George Tsavdaris » Wed Dec 01, 2010 6:53 pm

Dann Corbit wrote:[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
The magical Zillions of Games engine analyzes it with no problems and gives after 1 minute at depth 3: 1.Qfxf5 +0.26
after 2 minutes at depth 4: 1.Qhxh5 +1.26 [updated at d4: 1.Qhxh5 +0.13]
After his son's birth they've asked him:
"Is it a boy or girl?"
YES! He replied.....

bob
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Re: Still looking for the engine that can analyze this posit

Post by bob » Wed Dec 01, 2010 7:25 pm

Dann Corbit wrote:[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
Crafty won't crash. But it will produce the correct error messages:

illegal position, too many white queens
illegal position, too many white pieces
illegal position, too many black queens
illegal position, too many black pieces
bad string = "qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ"
Illegal position, using normal initial chess position

Which is what a reasonable program ought to produce.

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George Tsavdaris
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Re: Still looking for the engine that can analyze this posit

Post by George Tsavdaris » Wed Dec 01, 2010 7:42 pm

bob wrote: Crafty won't crash. But it will produce the correct error messages:

illegal position, too many white queens
illegal position, too many white pieces
illegal position, too many black queens
illegal position, too many black pieces
bad string = "qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ"
Illegal position, using normal initial chess position

Which is what a reasonable program ought to produce.
A reasonable Chess program i guess you mean, because a reasonable general program for Chess variations should produce analysis. :D

But as you put it, a reasonable Chess program should also produce an error message for the above position too. Does Crafty produces it or analyzes the position?
If the latter happens then Crafty is selective in analyzing non-Chess positions. and i guess the latter happens.

So instead of being selective in what positions to analyze it should just analyze them all, if the board is 8x8 and the pieces are all Chess pieces.
At least i find this better behavior than being selective. :D

[d]5r2/2k1p3/1bnp4/2p2N2/p3KP2/6P1/P1P5/1B2R3 w - - 0 1
After his son's birth they've asked him:
"Is it a boy or girl?"
YES! He replied.....

zullil
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Re: Still looking for the engine that can analyze this posit

Post by zullil » Wed Dec 01, 2010 9:03 pm

George Tsavdaris wrote: But as you put it, a reasonable Chess program should also produce an error message for the above position too. Does Crafty produces it or analyzes the position?

[d]5r2/2k1p3/1bnp4/2p2N2/p3KP2/6P1/P1P5/1B2R3 w - - 0 1
Crafty finds this impossible position acceptable:

Code: Select all

Crafty v23.4 (16 cpus)

White(1): setboard 5r2/2k1p3/1bnp4/2p2N2/p3KP2/6P1/P1P5/1B2R3 w - - 0 1
White(1): st 180
search time set to 180.00.
White(1): display

       +---+---+---+---+---+---+---+---+
    8  |   | . |   | . |   |<R>|   | . |
       +---+---+---+---+---+---+---+---+
    7  | . |   |<K>|   |<P>|   | . |   |
       +---+---+---+---+---+---+---+---+
    6  |   |<B>|<N>|<P>|   | . |   | . |
       +---+---+---+---+---+---+---+---+
    5  | . |   |<P>|   | . |-N-| . |   |
       +---+---+---+---+---+---+---+---+
    4  |<P>| . |   | . |-K-|-P-|   | . |
       +---+---+---+---+---+---+---+---+
    3  | . |   | . |   | . |   |-P-|   |
       +---+---+---+---+---+---+---+---+
    2  |-P-| . |-P-| . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    1  | . |-B-| . |   |-R-|   | . |   |
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

White&#40;1&#41;&#58; display stats
display statistics at end of each search.
White&#40;1&#41;&#58; go
              time limit 3&#58;00 (+0.00&#41; &#40;3&#58;00&#41;
              depth   time  score   variation &#40;1&#41;
starting thread 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <done>
               11->   0.06   0.42   1. Ne3 e6 2. c4 Rh8 3. g4 Nd4 4. g5
                                    Ba5 5. Rd1 Rh2 6. g6
               12     0.09   0.38   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2
               12->   0.09   0.38   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2
               13     0.11   0.25   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2 7. a3
               13->   0.12   0.25   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2 7. a3 &#40;s=2&#41;
               14     0.16   0.35   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2 7. Ra7 Kb6
               14->   0.18   0.35   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Ba5 5. Bd3 Rb8 6. g4 Rb2 7. Ra7 Kb6
               15     0.24   0.15   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Bc7 5. Bd3 Rb8 6. f5 exf5+ 7. Nxf5
                                    Rb2 8. Nxd4+ cxd4
               15->   0.32   0.15   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Bc7 5. Bd3 Rb8 6. f5 exf5+ 7. Nxf5
                                    Rb2 8. Nxd4+ cxd4 &#40;s=2&#41;
               16     0.45   0.00   1. Ne3 e6 2. c4 Nd4 3. Rh1 Kc6 4. Rh7
                                    Bc7 5. Bd3 Rb8 6. Nc2 Rb2 7. Nxd4+
                                    cxd4 8. g4 e5
               16     0.86   0.33   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. Kf3 Ne5+ 6. Kg3 Rf7 7. fxe5
                                    Rxg7 8. exd6 Bxd6+ 9. Kf3 Rf7+ 10.
                                    Ke4
               16->   0.89   0.33   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. Kf3 Ne5+ 6. Kg3 Rf7 7. fxe5
                                    Rxg7 8. exd6 Bxd6+ 9. Kf3 Rf7+ 10.
                                    Ke4
               17     1.04   0.24   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. f5 d5+ 6. Kf3 Ne5+ 7. Ke2 exf5
                                    8. Bxf5+ Kd6 9. Ne6 Rf7 10. Nxc7 Rxc7
               17->   1.12   0.24   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. f5 d5+ 6. Kf3 Ne5+ 7. Ke2 exf5
                                    8. Bxf5+ Kd6 9. Ne6 Rf7 10. Nxc7 Rxc7
               18     1.37   0.02   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. Kf3 Ne5+ 6. Kg3 Nxg4 7. Kxg4
                                    Rg8 8. Rxe6 Rxg7+ 9. Rg6 Rxg6+ 10.
                                    Bxg6
               18->   2.20   0.02   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. g4
                                    Bc7 5. Kf3 Ne5+ 6. Kg3 Nxg4 7. Kxg4
                                    Rg8 8. Rxe6 Rxg7+ 9. Rg6 Rxg6+ 10.
                                    Bxg6 &#40;s=4&#41;
               19     2.56   0.11   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. Kf3
                                    Ne5+ 5. Ke2 Ng4 6. Rxe6 Bxc3 7. Rg6
                                    Nf6 8. Bc2 a3 9. Kd3 Bd4 10. Ba4+ Ke7
                                    11. Nf5+ Kf7 &#40;s=3&#41;
               19->   3.28   0.11   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. Kf3
                                    Ne5+ 5. Ke2 Ng4 6. Rxe6 Bxc3 7. Rg6
                                    Nf6 8. Bc2 a3 9. Kd3 Bd4 10. Ba4+ Ke7
                                    11. Nf5+ Kf7 &#40;s=3&#41;
               20     4.34   0.14   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. Kf3
                                    Ne5+ 5. Ke2 Rb8 6. Bc2 Ng4 7. Re4 Rb2
                                    8. Kd2 Rxa2 9. Rxa4 Rxa4 10. Bxa4+
                                    Ke7 11. Kd3 &#40;s=2&#41;
               20->   5.22   0.14   1. c3 Ba5 2. Re3 e6 3. Ng7 Kd7 4. Kf3
                                    Ne5+ 5. Ke2 Rb8 6. Bc2 Ng4 7. Re4 Rb2
                                    8. Kd2 Rxa2 9. Rxa4 Rxa4 10. Bxa4+
                                    Ke7 11. Kd3
               21     9.28   0.06   1. c3 Ba5 2. Re3 Kd7 3. g4 e6 4. Ng7
                                    Bc7 5. Kf3 Ne5+ 6. Kg3 Nxg4 7. Kxg4
                                    Rg8 8. Rxe6 Rxg7+ 9. Rg6 Rxg6+ 10.
                                    Bxg6 Ke6 11. c4 Kf6
               21    20.10   0.33   1. c4 e6 2. Ne3 Nd4 3. Rh1 Kc6 4. Rh6
                                    Ba5 5. Bd3 Be1 6. Rg6 Bf2 7. Nc2 Re8
                                    8. Nxd4+ cxd4 9. g4 Re7 10. Rg8 Rh7
                                    11. Rc8+ Kb6
               21->  20.79   0.33   1. c4 e6 2. Ne3 Nd4 3. Rh1 Kc6 4. Rh6
                                    Ba5 5. Bd3 Be1 6. Rg6 Bf2 7. Nc2 Re8
                                    8. Nxd4+ cxd4 9. g4 Re7 10. Rg8 Rh7
                                    11. Rc8+ Kb6 &#40;s=3&#41;
               22    25.17   0.36   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. g4 Kc6 6. Nc2 d5+ 7. Ke3 Bc3
                                    8. Nxd4+ Bxd4+ 9. Kf3 Rb2 10. Rh6 Kd7
                                    11. a3 Rf2+ 12. Kg3 Rb2 13. Rh7+ Kd6
                                    &#40;s=2&#41;
               22->  27.35   0.36   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. g4 Kc6 6. Nc2 d5+ 7. Ke3 Bc3
                                    8. Nxd4+ Bxd4+ 9. Kf3 Rb2 10. Rh6 Kd7
                                    11. a3 Rf2+ 12. Kg3 Rb2 13. Rh7+ Kd6
               23    34.03   0.39   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. g4 Kc6 6. f5 exf5+ 7. gxf5 Rb2
                                    8. f6 Rxa2 9. f7 Ne6 10. Rh5 Rb2 11.
                                    Nd1 Rg2 12. Ne3
               23->  36.94   0.39   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. g4 Kc6 6. f5 exf5+ 7. gxf5 Rb2
                                    8. f6 Rxa2 9. f7 Ne6 10. Rh5 Rb2 11.
                                    Nd1 Rg2 12. Ne3
               24    45.77   0.19   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Nc2
                                    Ne2 5. Kf3 Nc3 6. Ne3 Nxb1 7. Rxb1
                                    Kc6 8. g4 Rh8 9. g5 Bd2 10. Ke4 Bxe3
                                    11. Kxe3 Rh3+ 12. Ke4 Rc3 13. f5 Rxc4+
                                    14. Kd3
               24->  53.60   0.19   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Nc2
                                    Ne2 5. Kf3 Nc3 6. Ne3 Nxb1 7. Rxb1
                                    Kc6 8. g4 Rh8 9. g5 Bd2 10. Ke4 Bxe3
                                    11. Kxe3 Rh3+ 12. Ke4 Rc3 13. f5 Rxc4+
                                    14. Kd3
               25     1&#58;05   0.19   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Nc2
                                    Ne2 5. Kf3 Nc3 6. Ne3 Nxb1 7. Rxb1
                                    Kc6 8. g4 Bc3 9. Ke4 Rh8 10. Rc1 Bd4
                                    11. g5 Bxe3 12. Kxe3 Rh2 13. Ra1
               25->   1&#58;16   0.19   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Nc2
                                    Ne2 5. Kf3 Nc3 6. Ne3 Nxb1 7. Rxb1
                                    Kc6 8. g4 Bc3 9. Ke4 Rh8 10. Rc1 Bd4
                                    11. g5 Bxe3 12. Kxe3 Rh2 13. Ra1
               26     1&#58;58   0.33   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. Rh7+ Kc6 6. Ra7 Bc7 7. Ra6+
                                    Kb7 8. Rxa4 Kc6 9. Nc2 Rg8 10. Nxd4+
                                    cxd4 11. Kf3 e5 12. Rb4 Rh8 13. a4
                                    Rh2 14. Rb5 Ra2 15. Be4+ Kd7
               26->   2&#58;18   0.33   1. c4 e6 2. Ne3 Nd4 3. Rh1 Ba5 4. Bd3
                                    Rb8 5. Rh7+ Kc6 6. Ra7 Bc7 7. Ra6+
                                    Kb7 8. Rxa4 Kc6 9. Nc2 Rg8 10. Nxd4+
                                    cxd4 11. Kf3 e5 12. Rb4 Rh8 13. a4
                                    Rh2 14. Rb5 Ra2 15. Be4+ Kd7
              time=3&#58;00  mat=0  n=4141454327  fh=89%  nps=23.0M       
              extensions=99.8M qchecks=247.2M reduced=407.2M pruned=767.2M
              predicted=0  evals=1707.5M  50move=0  EGTBprobes=1K  hits=1K
              SMP->  splits=351522  aborts=52237  data=91/1024  elap=3&#58;00
terminating SMP processes.
White&#40;1&#41;&#58; c4
              time used&#58;   3&#58;00
Black&#40;1&#41;&#58; quit

Dann Corbit
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Re: Still looking for the engine that can analyze this posit

Post by Dann Corbit » Wed Dec 01, 2010 9:17 pm

bob wrote:
Dann Corbit wrote:[d]qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ w - -

What do you mean it's not a real chess position? I want to see it analyzed.

So far, every engine has crashed instantly except Rybka of all the engines that I tried, but Rybka refused to utter a single syllable after 15 mintues of thought. I think the slimy fish knows the answer, but he's not telling just to spite me.
Crafty won't crash. But it will produce the correct error messages:

illegal position, too many white queens
illegal position, too many white pieces
illegal position, too many black queens
illegal position, too many black pieces
bad string = "qqqqkqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQKQQQ"
Illegal position, using normal initial chess position

Which is what a reasonable program ought to produce.
Refusing to analyze the position is a totally legitimate option.
What is not legitimate is simply overwriting memory and then doing a core dump.

However, I have deep appreciation for programs that try to process fantasy positions that cannot happen in real life simply because they are fun.

It's all a matter of taste.

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