Caterpillar position

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David Dahlem
Posts: 900
Joined: Wed Mar 08, 2006 9:06 pm

Caterpillar position

Post by David Dahlem »

[D]r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1

Can any engine solve this study?

[Event "Bent Study"]
[Site "?"]
[Date "1966.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1"]

1.Nf2+ Ke5 2.Nd3+ Ke6 3.Nc5+ Ke5 4.Bd6+ cxd6 5.Re7+ Qe6 6.Rxe6+ fxe6 7.Nd3+ Ke4 8.Nf2+ Ke5 9.Nd2 Rxa6+ 10.Kxa6 Bc4+ 11.Ka5 Be2 12.Kb4 d3 13.Kc3 d4+ 14.Kc4 d5+ 15.Kc5 f3 16.g3 f4 17.g4 f5 18.g5 Bf1 19. Nxf3# {Mate} 1-0

StockFish 1.3.6s shows a dead draw after 2-1/2 hours:

34 2:31:43 9.420.941,801 1.034.894 0.00 Nh3f2+ Ke4e5 Nf2d3+ Ke5e6 Nd3c5+ Ke6e5 Nc5d3+
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Arturo Ochoa
Posts: 220
Joined: Wed Mar 08, 2006 9:27 pm
Location: Montréal, Canada

Caterpillar position .... Now the symmetrical positions...

Post by Arturo Ochoa »

David Dahlem wrote:[D]r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1

Can any engine solve this study?

[Event "Bent Study"]
[Site "?"]
[Date "1966.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1"]

1.Nf2+ Ke5 2.Nd3+ Ke6 3.Nc5+ Ke5 4.Bd6+ cxd6 5.Re7+ Qe6 6.Rxe6+ fxe6 7.Nd3+ Ke4 8.Nf2+ Ke5 9.Nd2 Rxa6+ 10.Kxa6 Bc4+ 11.Ka5 Be2 12.Kb4 d3 13.Kc3 d4+ 14.Kc4 d5+ 15.Kc5 f3 16.g3 f4 17.g4 f5 18.g5 Bf1 19. Nxf3# {Mate} 1-0

StockFish 1.3.6s shows a dead draw after 2-1/2 hours:

34 2:31:43 9.420.941,801 1.034.894 0.00 Nh3f2+ Ke4e5 Nf2d3+ Ke5e6 Nd3c5+ Ke6e5 Nc5d3+
[D]5q1r/2pBRp2/2p4P/2p1p2K/2pkp3/N7/1P5b/2N5 w - - 0 1

[D]5n2/B5p1/7n/3PKP2/k2P1P2/p4P2/2PrbP2/R1Q5 b - - 0 1

[D]2n5/1p5B/n7/2PKP3/2P1P2k/2P4p/2PbrP2/5Q1R b - - 0 1
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rlsuth
Posts: 322
Joined: Wed Mar 08, 2006 9:37 pm

Re: Caterpillar position

Post by rlsuth »

David Dahlem wrote:
1.Nf2+ Ke5 2.Nd3+ Ke6

StockFish 1.3.6s shows a dead draw after 2-1/2 hours:

Could it be because there is no mate if black plays 2. .... Ke4?
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tmokonen
Posts: 1296
Joined: Sun Mar 12, 2006 6:46 pm
Location: Kelowna
Full name: Tony Mokonen

Re: Caterpillar position

Post by tmokonen »

2.. Ke4 leads into the main line after 3. Nc5+
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rlsuth
Posts: 322
Joined: Wed Mar 08, 2006 9:37 pm

Re: Caterpillar position

Post by rlsuth »

tmokonen wrote:2.. Ke4 leads into the main line after 3. Nc5+

Of course it does, duh! I was blinded by the great big 0.00 score I have in this position. :)

This position is way too deep for my little PC.
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David Dahlem
Posts: 900
Joined: Wed Mar 08, 2006 9:06 pm

Re: Caterpillar position

Post by David Dahlem »

[D]r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1

By starting at the end of the main line, and analyzing backwards, Spark 0.3a sees the mate. But that's cheating. :lol:

4. Bd6 is the move that engines seem to choke on. :roll:

Spark 0.3a:

17/39 00:02 4.572.638 1.805.939 +M19 Nh3f2+ Ke4e5 Nf2d3+ Ke5e4 Nd3c5+ Ke4e5 Be7d6+ c7xd6 Rd7e7+ Qc8e6 Re7xe6+ f7xe6 Nc5d3+ Ke5e4 Nd3f2+ Ke4e5 Nf1d2 Ra8xa6+ Ka5xa6 Ba2c4+ Ka6a5 f4f3 g2g3 Bc4e2 Ka5b4 f5f4 g3g4 f6f5 g4g5 d4d3 Kb4c3 d5d4+ Kc3c4 d6d5+ Kc4c5 Be2d1 Nf2xd3+
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Arturo Ochoa
Posts: 220
Joined: Wed Mar 08, 2006 9:27 pm
Location: Montréal, Canada

PopeyeUCI 1.7 is still on the search after 11hrs... (nt)

Post by Arturo Ochoa »

David Dahlem wrote:[D]r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1

Can any engine solve this study?

[Event "Bent Study"]
[Site "?"]
[Date "1966.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1"]

1.Nf2+ Ke5 2.Nd3+ Ke6 3.Nc5+ Ke5 4.Bd6+ cxd6 5.Re7+ Qe6 6.Rxe6+ fxe6 7.Nd3+ Ke4 8.Nf2+ Ke5 9.Nd2 Rxa6+ 10.Kxa6 Bc4+ 11.Ka5 Be2 12.Kb4 d3 13.Kc3 d4+ 14.Kc4 d5+ 15.Kc5 f3 16.g3 f4 17.g4 f5 18.g5 Bf1 19. Nxf3# {Mate} 1-0

StockFish 1.3.6s shows a dead draw after 2-1/2 hours:

34 2:31:43 9.420.941,801 1.034.894 0.00 Nh3f2+ Ke4e5 Nf2d3+ Ke5e6 Nd3c5+ Ke6e5 Nc5d3+
:shock:
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rlsuth
Posts: 322
Joined: Wed Mar 08, 2006 9:37 pm

Re: Caterpillar position

Post by rlsuth »

I wondered if an older program might have better luck since it wouldn't have as advanced pruning, so I tried Nimzo 8.

Analysis by Nimzo 8:

1.Nf2+ Ke5 2.Nd3+ Ke6 3.Nc5+ Ke5 4.Bd6+ cxd6 5.Re7+ Qe6 6.Rxe6+
+- (3.49) Depth: 23/44 03:46:22 51262mN
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Arturo Ochoa
Posts: 220
Joined: Wed Mar 08, 2006 9:27 pm
Location: Montréal, Canada

PopeyeUCI 1.7 is still on the search after 1 day... (nt)

Post by Arturo Ochoa »

Arturo Ochoa wrote:
David Dahlem wrote:[D]r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1

Can any engine solve this study?

[Event "Bent Study"]
[Site "?"]
[Date "1966.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1q5/2pRBp2/P4p2/K2p1p2/3pkp2/7N/b5P1/5N2 w - - 0 1"]

1.Nf2+ Ke5 2.Nd3+ Ke6 3.Nc5+ Ke5 4.Bd6+ cxd6 5.Re7+ Qe6 6.Rxe6+ fxe6 7.Nd3+ Ke4 8.Nf2+ Ke5 9.Nd2 Rxa6+ 10.Kxa6 Bc4+ 11.Ka5 Be2 12.Kb4 d3 13.Kc3 d4+ 14.Kc4 d5+ 15.Kc5 f3 16.g3 f4 17.g4 f5 18.g5 Bf1 19. Nxf3# {Mate} 1-0

StockFish 1.3.6s shows a dead draw after 2-1/2 hours:

34 2:31:43 9.420.941,801 1.034.894 0.00 Nh3f2+ Ke4e5 Nf2d3+ Ke5e6 Nd3c5+ Ke6e5 Nc5d3+
:shock:
:o
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Michael Diosi
Posts: 672
Joined: Mon Jun 22, 2009 1:37 pm

Re: PopeyeUCI 1.7 is still on the search after 1 day... (nt)

Post by Michael Diosi »

Hi,


Well you know that Popeye is not that good in solving long orthodox mates. Popeyes specialities are: helpmates, helpstalemates and serieshelpmates as you can read here:

http://web.telecom.cz/vaclav.kotesovec/hppopeye.htm
and here:

http://web.telecom.cz/vaclav.kotesovec/hppopeye.htm

Nevertheless I bet it is still faster than Mate 2.xx by ChessBase

Michael
http://www.playwitharena.com
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