test position

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MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

test position

Post by MikeGL »

[D]rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1

white wins


p.s. some engines might even announce mate from this position
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: test position

Post by zullil »

MikeGL wrote:[D]rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1

white wins


p.s. some engines might even announce mate from this position
Critter-1.2.1 (8 threads) says Mate-in-16:

Code: Select all

26/108  02:17 1385565400 10068857   +M16 Bd5 Rb3+ Kc1 Rc3+ Kd1 Rd3+ Ke1 Re3+ Kf1 Rf3+ Kg1 Rxg3+ Kf1 Rf3+ Ke1 Re3+ Kd1 Rd3+ Kc1 Rc3+ Kb1 Rb3+ axb3 Ra1+ Kxa1 dxc5 dxc5 Qh5 c6 Bh6 c7#
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ZirconiumX
Posts: 1334
Joined: Sun Jul 17, 2011 11:14 am

Re: test position

Post by ZirconiumX »

Critter must have something wrong; crafty 23.4 (1 thread) says mate in 8.

Code: Select all

	15  32752      51 231876  1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Bxf3 d5 7. Bxd5 hxg3 8. bxa8=Q#
Fruit 2.1 can't find the mate, it thinks that the position is a repetition draw:

Code: Select all

info depth 16 seldepth 48 score cp 0 time 71949 nodes 11093208 pv c4d5 c3b3 b1c1 b3c3 c1b1
HIARCS v13.2 also thinks it is a draw:

Code: Select all

info depth 13 seldepth 13 time 6674 nodes 67699 nps 10317 score cp 0 pv c4d5 c3b3 b1c1 b3c3 c1b1
Stockfish 2.1.1 says position is a draw:

Code: Select all

info depth 26 seldepth 13 multipv 1 score cp 0 nodes 5230633 nps 108550 time 48186 pv b6c7 b8a7 c7b6 a7b8
So 3 draws, 1 mate; Dr Hyatt can now proudly say that his program is better than the World Chess Software Champion.

Matthew:out
Some believe in the almighty dollar.

I believe in the almighty printf statement.
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: test position

Post by zullil »

ZirconiumX wrote:Critter must have something wrong; crafty 23.4 (1 thread) says mate in 8.

Code: Select all

	15  32752      51 231876  1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Bxf3 d5 7. Bxd5 hxg3 8. bxa8=Q#
Here's what Crafty-23.4 (8 threads) gives me:

Code: Select all

Crafty v23.4 (8 cpus)

White(1): hash 2048M
Warning--  xboard 'memory' option disabled
hash table memory = 2048M bytes (128M entries).
White(1): setboard rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1
White(1): st 120
search time set to 120.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 2:00 (+0.00) (2:00)
              depth   time  score   variation (1)
starting thread 1 2 3 4 5 6 7 <done>
               14     0.04   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1
               14->   0.05   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               15     0.05   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=2&#41;
               15->   0.06   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               16     0.07   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               16->   0.09   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               17     0.10   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=2&#41;
               17->   0.15   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               18     0.16   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=2&#41;
               18->   0.22   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               19     0.24   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               19->   0.32   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               20     0.35   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               20->   0.45   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               21     0.50   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               21->   0.65   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               22     0.70   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=3&#41;
               22->   1.27   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=5&#41;
               23     1.35   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=4&#41;
               23->   1.92   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=7&#41;
               24     2.01   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=6&#41;
               24->   4.08   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=7&#41;
               25     4.22   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=6&#41;
               25->  11.30   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=9&#41;
               26    11.52   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=8&#41;
               26->  17.22   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=9&#41;
               27    17.68   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=8&#41;
               27->  29.03   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=8&#41;
               28    29.62   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=7&#41;
               28->  52.11   0.01   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kb1 &#40;s=9&#41;
               29     1&#58;02     +1   1. Bd5!                           
               29     1&#58;03     +3   1. Bd5!                           
               29     1&#58;05     +M   1. Bd5!                           
               29     1&#58;07  Mat16   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+
                                    4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Kg1 Rxg3+
                                    7. Kf1 Rf3+ 8. Ke1 Re3+ 9. Kd1 Rd3+
                                    10. Kc1 Rc3+ 11. Kb1 Rb3+ 12. axb3
                                    Ra1+ 13. Kxa1 dxc5 14. dxc5 Nh6 15.
                                    c6 Nxg4 16. c7# &#40;s=8&#41;
               29->   1&#58;30  Mat16   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+
                                    4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Kg1 Rxg3+
                                    7. Kf1 Rf3+ 8. Ke1 Re3+ 9. Kd1 Rd3+
                                    10. Kc1 Rc3+ 11. Kb1 Rb3+ 12. axb3
                                    Ra1+ 13. Kxa1 dxc5 14. dxc5 Nh6 15.
                                    c6 Nxg4 16. c7# &#40;s=8&#41;
               30     1&#58;32  Mat16   1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+
                                    4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Kg1 Rxg3+
                                    7. Kf1 Rf3+ 8. Ke1 Re3+ 9. Kd1 Rd3+
                                    10. Kc1 Rc3+ 11. Kb1 Rb3+ 12. axb3
                                    Ra1+ 13. Kxa1 dxc5 14. dxc5 Nh6 15.
                                    c6 Nxg4 16. c7# &#40;s=7&#41;
              time=2&#58;00  mat=-16  n=3190965665  fh=80%  nps=26.6M     
              extensions=176.4M qchecks=390.5M reduced=260.9M pruned=934.8M
              predicted=0  evals=268.3M  50move=0  EGTBprobes=0  hits=0
              SMP->  splits=114196  aborts=17542  data=59/512  elap=2&#58;00
terminating SMP processes.

mate in 16 moves.

White&#40;1&#41;&#58; Bd5
              time used&#58;   2&#58;00
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: test position

Post by kgburcham »

Critter must have something wrong; crafty 23.4 (1 thread) says mate in 8.
Code: 15 32752 51 231876 1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Bxf3 d5 7. Bxd5 hxg3 8. bxa8=Q#


Matthew in your mate in 8 line, it calls for 6.Bxf3 as next move in this position which is incorrect. please check why.
Note the e4 pawn preventing the Bishop from capturing the Rook after this line. Tell Doc Hyatt he must return the prize money for the Mate in 8.

1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+

[D] rk3bnq/1P2p3/1B1pPp2/2NB1Pp1/3Pp1Pp/5rP1/P7/5K2 w - -
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: test position

Post by zullil »

kgburcham wrote:
Critter must have something wrong; crafty 23.4 (1 thread) says mate in 8.
Code: 15 32752 51 231876 1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Bxf3 d5 7. Bxd5 hxg3 8. bxa8=Q#


Matthew in your mate in 8 line, it calls for 6.Bxf3 as next move in this position which is incorrect. please check why.
Note the e4 pawn preventing the Bishop from capturing the Rook after this line. Tell Doc Hyatt he must return the prize money for the Mate in 8.

1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+

[D] rk3bnq/1P2p3/1B1pPp2/2NB1Pp1/3Pp1Pp/5rP1/P7/5K2 w - -
My guess is that he set up the position manually (rather than by entering the FEN) and omitted the e4 pawn.
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Dan Astrachan
Posts: 134
Joined: Fri May 28, 2010 11:07 am

Re: test position

Post by Dan Astrachan »

This is actually a mate in 16, and a fun one at that. :)

Here is the solution courtesy of Ivanhoe 46f x64:

Anonymous1 - Anonymous2


1. Bd5 Rb3+ 2. Kc1 Rc3+ 3. Kd1 Rd3+ 4. Ke1 Re3+ 5. Kf1 Rf3+ 6. Kg1 Rxg3+ 7. Kf1 Rf3+ 8. Ke1 Re3+ 9. Kd1 Rd3+ 10. Kc1 Rc3+ 11. Kb1 Rb3+ 12. axb3 Ra1+ 13. Kxa1 dxc5 14. dxc5 Qh5 15. c6 Qxg4 16. c7# Depth: 33 | Processing time: 376.056 sec.
Moves processed: 4475307277 | Speed: 11900000 moves per sec.

Generated by Kvetka

Here is the final position:

[D]1k3bn1/1PP1p3/1B2Pp2/3B1Pp1/4p1qp/1P6/8/K7 b - - 0 16
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Ajedrecista
Posts: 1968
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Re: test position

Post by Ajedrecista »

Hello to everybody:

[d]rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1

I analysed this position with Deep Rybka 4.1 w32 and Komodo 3 w32 under Arena 2.0.1 using 128 MB of hash. My system is an Intel Pentium D930 (2 cores) and 2999 MHz (without overclocking):

Code: Select all

FEN&#58; rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1 

Deep Rybka 4.1 w32&#58;
   1	00&#58;00	          96	2.000	-9,42	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8 Rc3xg3 Bd5xe4 Rg3xg4
   2	00&#58;00	         162	3.375	-9,51	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8 Rc3xg3 Bd5xe4 Rg3xg4 Be4d5
   2	00&#58;00	         197	4.104	+M3	Bc4d5 Rc3c1+ Kb1xc1 d6xc5 b7xa8Q+
   3	00&#58;00	         534	8.343	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   4	00&#58;00	         615	9.609	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   5	00&#58;00	         671	8.493	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   6	00&#58;00	         772	9.772	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   7	00&#58;00	       1.158	14.658	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   8	00&#58;00	       2.043	18.405	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
   9	00&#58;00	       3.558	28.238	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  10	00&#58;00	       6.251	33.074	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  11	00&#58;00	      11.797	47.000	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  12	00&#58;00	      21.080	58.393	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  13	00&#58;00	      39.563	68.329	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  14	00&#58;01	      66.716	73.475	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  15	00&#58;01	     123.129	78.726	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  16	00&#58;02	     176.500	80.630	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  17	00&#58;03	     264.172	82.040	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  18	00&#58;05	     455.208	82.750	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  19	00&#58;09	     720.079	80.419	 0,00	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  20+	00&#58;17	   1.344.629	79.899	+0,12	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  20+	00&#58;19	   1.478.378	78.125	+0,27	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  20+	00&#58;22	   1.646.702	75.543	+51,07	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1 Rb3c3+ Kc1b1 Rc3b3+ Kb1c1
  20	00&#58;28	   2.397.309	84.204	+M16	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1d1 Rc3d3+ Kd1e1 Rd3e3+ Ke1f1 Re3f3+ Kf1g1 Rf3xg3+ Kg1f1 Rg3f3+ Kf1e1 Rf3e3+ Ke1d1 Re3d3+ Kd1c1 Rd3c3+ Kc1b1 Rc3b3+ a2xb3 Ra8a1+ Kb1xa1 d6xc5 d4xc5 Bf8h6 c5c6 h4h3 c6c7+
  21	00&#58;40	   3.653.651	90.699	+M16	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1d1 Rc3d3+ Kd1e1 Rd3e3+ Ke1f1 Re3f3+ Kf1g1 Rf3xg3+ Kg1f1 Rg3f3+ Kf1e1 Rf3e3+ Ke1d1 Re3d3+ Kd1c1 Rd3c3+ Kc1b1 Rc3b3+ a2xb3 Ra8a1+ Kb1xa1 d6xc5 d4xc5 Bf8h6 c5c6 h4h3 c6c7+
  22	00&#58;59	   5.637.779	95.833	+M16	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1d1 Rc3d3+ Kd1e1 Rd3e3+ Ke1f1 Re3f3+ Kf1g1 Rf3xg3+ Kg1f1 Rg3f3+ Kf1e1 Rf3e3+ Ke1d1 Re3d3+ Kd1c1 Rd3c3+ Kc1b1 Rc3b3+ a2xb3 Ra8a1+ Kb1xa1 d6xc5 d4xc5 Bf8h6 c5c6 h4h3 c6c7+
  23	01&#58;17	   7.502.958	96.947	+M16	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1d1 Rc3d3+ Kd1e1 Rd3e3+ Ke1f1 Re3f3+ Kf1g1 Rf3xg3+ Kg1f1 Rg3f3+ Kf1e1 Rf3e3+ Ke1d1 Re3d3+ Kd1c1 Rd3c3+ Kc1b1 Rc3b3+ a2xb3 Ra8a1+ Kb1xa1 d6xc5 d4xc5 Bf8h6 c5c6 h4h3 c6c7+
  23	01&#58;30	   8.721.905	96.539	+M16	Bc4d5 Rc3b3+ Kb1c1 Rb3c3+ Kc1d1 Rc3d3+ Kd1e1 Rd3e3+ Ke1f1 Re3f3+ Kf1g1 Rf3xg3+ Kg1f1 Rg3f3+ Kf1e1 Rf3e3+ Ke1d1 Re3d3+ Kd1c1 Rd3c3+ Kc1b1 Rc3b3+ a2xb3 Ra8a1+ Kb1xa1 d6xc5 d4xc5 Bf8h6 c5c6 h4h3 c6c7+

Code: Select all

FEN&#58; rk3bnq/1P2p3/1B1pPp2/2N2Pp1/2BPp1Pp/2r3P1/P7/1K6 w - - 0 1 

Komodo3-32&#58;
   1	00&#58;00	         429	4.289.999	-7,59	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8
   2	00&#58;00	         550	5.499.999	-7,59	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8 Rc3xg3
   3	00&#58;00	       1.171	11.709.999	-7,59	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8 Rc3xg3 Bd5xe4 Rg3xg4
   4	00&#58;00	       1.723	110.272	-7,91	b7xa8Q+ Kb8xa8 Bc4d5+ Ka8b8 Nc5d7+ Kb8c8 Nd7xf8 h4xg3 Bd5xe4 Qh8h3 Kb1b2 Qh3xg4
   5	00&#58;00	       1.982	126.848	-8,07	b7xa8Q+ Kb8xa8
   5	00&#58;00	       2.525	161.600	-7,68	Bc4d5
   5	00&#58;00	       2.682	171.648	+M3	Bc4d5
   5	00&#58;00	       2.924	187.136	+M3	Bc4d5 Rc3c1+ Kb1xc1 d6xc5 b7xa8Q+
   5	00&#58;00	       3.041	194.624	+M3	Bc4d5 Rc3c1+ Kb1xc1 d6xc5 b7xa8Q+
Deep Rybka 4.1 was fairly fast (less than 30 seconds in my 'old' system) but depth 2 (with 197 nodes searched) is really interesting; then going with Komodo 3, this wrong mainline was exactly reproduced and the engine stopped analysing. It is very curious, since Komodo 2.03 JA w32 is stacked with -0.05 evals, giving a repetition line (Bd5+, Rb3+; Kc1, Rc3+; Kb1). So, it looks like a bug introduced between 2.03 and 3 versions of Komodo.

Regards from Spain.

Ajedrecista.
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User avatar
F.Huber
Posts: 853
Joined: Thu Mar 09, 2006 4:50 pm
Location: Austria

Re: test position

Post by F.Huber »

This #16 is already in the ChestUCI database as mirrored position.
So if you let ChestUCI analyze this position in one of the 'special' modes (Special or AutoTurbo) it will find it in the database and automatically use the stored special parameters (which are of course also valid for the mirrored position):

qnb3kr/3p2P1/2pPp1B1/1pP2N2/pP1pPB2/1P3r2/7P/6K1 w - - bm #16; 00:05 @ C0/R2/K2/P8/X28;
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Ajedrecista
Posts: 1968
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Re: test position

Post by Ajedrecista »

Hi Franz:
F.Huber wrote:This #16 is already in the ChestUCI database as mirrored position.
So if you let ChestUCI analyze this position in one of the 'special' modes (Special or AutoTurbo) it will find it in the database and automatically use the stored special parameters (which are of course also valid for the mirrored position):

qnb3kr/3p2P1/2pPp1B1/1pP2N2/pP1pPB2/1P3r2/7P/6K1 w - - bm #16; 00:05 @ C0/R2/K2/P8/X28;
In fact, the first engine I tried was Chest UCI 5.2 with 128 MB of hash in AutoTurbo SearchMode if I am not wrong: the position was solved in around 0.84 seconds... then I realized that it was in the database indeed. I cleared hash, set hash table to 64 MB and time to solve this problem was 828 ms (a little less than with 128 MB of hash). Simply no words for this excellent mate solver! Just a pity that Chest will not become multithreaded... the same story as Cake 1.85 (and former versions of Cake), an excellent freeware checkers programme by Martin Fierz from Switzerland (only single core and w32, as Chest UCI). Anyway, I must say that Chest is excellent once again. Thanks!

Regards from Spain.

Ajedrecista.
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