pawn racing

Discussion of anything and everything relating to chess playing software and machines.

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mhalstern
Posts: 484
Joined: Wed Nov 18, 2009 1:09 am

Re: pawn racing

Post by mhalstern »

Naum 4:

New game
8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - - 0 1

Analysis by Naum 4 64 bit:

1.Be4 Nxc2 2.Bxf3 Nb4 3.Bb7 Nd3
+/= (0.56) Depth: 6/11 00:00:00 1kN
1.Kc7 Kd2 2.Kb7 Ke2 3.Kxa7 Kxf2
+/- (1.23) Depth: 6/11 00:00:00 3kN
1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Nb5 4.c4
+/- (0.89) Depth: 7/10 00:00:00 4kN
1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Nb5 4.c4 Kxf2
+/- (1.16) Depth: 8/11 00:00:00 5kN
1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Nb3 4.Bc2 Nc5+ 5.Kxa7
+/- (0.77) Depth: 9/13 00:00:00 10kN
1.Be4 Kd2 2.Kd6 Kc3 3.Ke5 Kc4 4.Bd5+ Kc5 5.c3
+/- (0.96) Depth: 9/15 00:00:00 16kN
1.Be4 Kd2 2.Kd6 Kc3 3.Ke5 Kc4 4.Kf4 Kb5 5.Ke3 Kc5
+/- (0.96) Depth: 10/16 00:00:00 19kN
1.Be4 Kd2 2.Kd6 Kc3 3.Ke5 Kc4 4.Bd5+ Kc5 5.c3 Ne2
+/- (0.97) Depth: 11/17 00:00:00 29kN
1.Be4 Kd2 2.Kd6 Kc3 3.Ke5 Kc4 4.Kf4 Kb5 5.Ke3 Kc4 6.Bxf3 Nxc2+
+/- (0.96) Depth: 12/17 00:00:00 39kN
1.Kc7 Nb5+ 2.Kc6 Kb4 3.Kb7 Kc5 4.Bd3 Nd4 5.Kxa7 Kc6 6.Be4+ Kd7
+- (3.08) Depth: 12/34 00:00:00 330kN, tb=116
1.Kc7 Nxc2 2.Be4 Nb4 3.Kb7 Kd2 4.Bxf3 Ke1 5.Be2 Kxf2 6.Bb5 Ke3 7.Bc4
= (0.03) Depth: 13/25 00:00:00 433kN, tb=941
1.Be4 Nxc2 2.Bxf3 Ne1 3.Bb7 Kd4 4.Kc7 Nd3 5.f3 Kc5 6.Be4 Nf2 7.Bf5
+/- (0.77) Depth: 13/31 00:00:00 544kN, tb=1136
1.Be4 Nxc2 2.Bxf3 Nb4 3.Bb7 Nd3 4.f3 Kc4 5.Kc7 Kb5 6.Bc8 Nc5 7.Kd6 Kc4
+/- (0.80) Depth: 14/24 00:00:00 701kN, tb=1504
1.Be4 Nxc2 2.Bxf3 Nb4 3.Bb7 Nd3 4.f3 Kc4 5.Kc7 Kb5 6.Bc8 Nc5 7.Kd6 Kc4 8.f4
+/- (0.80) Depth: 15/18 00:00:00 752kN, tb=1803
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Be4 Kc3 5.Bxf3 Nxc2 6.Ke4 Kd2 7.Bg4 Nb4 8.Bc8
+/- (0.99) Depth: 15/27 00:00:00 897kN, tb=2142
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Be4 Kc3 5.Bxf3 Nxc2 6.Ke4 Kd2 7.Bg4 Nb4 8.Bc8 Nd3
+/- (1.02) Depth: 16/24 00:00:00 1006kN, tb=2184
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Bd3 Kc3 5.Ke3 Ne6 6.Kxf3 Kd4 7.Kg4 Ke5 8.f3 Nf4 9.Be4
+- (1.64) Depth: 17/33 00:00:00 1604kN, tb=2911
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Bd3 Kc3 5.Ke3 Ne6 6.Kxf3 Kd4 7.Kg4 Ke5 8.f3 Nf4 9.Be4 Ne6
+- (1.64) Depth: 18/33 00:00:01 1899kN, tb=3510
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Bd3 Kc3 5.Ke3 Ne6 6.Kxf3 Kd4 7.Kg4 Ke5 8.Bb5 Nf4 9.Bc6 Ne6 10.f3
+- (1.62) Depth: 19/31 00:00:01 2379kN, tb=4437
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Bd3 Kc3 5.Ke3 Ne6 6.Kxf3 Kd4 7.Kg4 Ke5 8.f3 Nf4 9.Bc4 Ng2 10.Kg5 Kd4
+- (1.69) Depth: 20/31 00:00:01 3325kN, tb=6166
1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Nd4 4.Bd3 Kc3 5.Ke3 Ne6 6.Kxf3 Kd4 7.Kg4 Ke5 8.f3 Nf4 9.Bc4 Ng2 10.Kg5 Kd4 11.Bd3
+- (1.71) Depth: 21/34 00:00:02 4848kN, tb=8552
1.Kd6 Kb4 2.Kc7 Kc5 3.Kb7 Kd6 4.Be4 Kd7 5.Kxa7 Kc7 6.c4 Ne2 7.Bxf3 Nf4 8.Bd5 Nh3 9.f3 Nf4 10.Be4 Ne6 11.Bb7 Nf4
+- (3.63) Depth: 22/42 00:00:14 29584kN, tb=66153
1.Kd6 Kb4 2.Kc7 Kc5 3.Kb7 Kd6 4.Be4 Kd7 5.Kxa7 Kc7 6.c4 Ne2 7.Bxf3 Nf4 8.Bd5 Nh3 9.f3 Nf4 10.Be4 Ne6 11.Bb7 Nf4 12.Bd5
+- (3.63) Depth: 23/42 00:00:17 33824kN, tb=85234
1.Kd6 Kb4 2.Kc7 Kc5 3.Kb7 Kd6 4.Be4 Kd7 5.Kxa7 Kc7 6.c4 Ne2 7.Bxf3 Nf4 8.Bd5 Nh3 9.f3 Nf4 10.Be4 Ne6 11.Bb7 Nf4 12.Bd5 Nd3
+- (3.63) Depth: 24/43 00:00:19 37916kN, tb=93153
1.Kd6 Kb4 2.Kc7 Kc5 3.Kb7 Kd6 4.Be4 Kd7 5.Kxa7 Kc7 6.c4 Ne2 7.Bxf3 Nf4 8.Bd5 Nh3 9.f3 Nf4 10.Be4 Ne6 11.Bb7 Nf4 12.Bd5 Nd3 13.Be6
+- (3.63) Depth: 25/43 00:00:26 45846kN, tb=126814
1.Kd6 Kb4 2.Kc7 Kc5 3.Kb7 Kd6 4.Be4 Kd7 5.Kxa7 Kc7 6.c4 Ne2 7.Bxf3 Nf4 8.Bd5 Nh3 9.f3 Nf4 10.Be4 Ne6 11.Bb7 Nf4 12.Bd5 Nd3 13.Be6 Nc5
+- (3.63) Depth: 26/44 00:00:32 56850kN, tb=151702
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: pawn racing

Post by lech »

Houdini wrote:
lech wrote:Houdini has another problem and probably can't solve it.
Maybe Stockfish is realy the best in endgames. :D
Using 4 cores Houdini 1.02 finds Kd6 at depth 31 in about 2 minutes:

Code: Select all

 30/67	 0:32 	+3.66 	1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd4 4.Kc7 Ke5 5.Kb7 Kd6 6.f4 Nd5 7.f5 Nf6 8.Bf1 Ng8 9.Bd3 Nf6 10.Bc4 Ne4 11.Be6 Nf6 12.Bb3 Kd7 13.Bc2 Kd6 14.Bd3 (316.765.735) 9761
 31/67	 0:44 	+3.66 	1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd4 4.Kc7 Ke5 5.Kb7 Kd6 6.f4 Nd5 7.f5 Nf6 8.Bf1 Ng8 9.Bd3 Nf6 10.Bc4 Ne4 11.Be6 Nf6 12.Bb3 Kd7 13.Bc2 Kd6 14.Bd3 (442.939.355) 9879
 31/67	 1:33 	+3.83++	1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kc3 4.Ke4 Kc4 5.Kxf3 Kb5 6.Ke4 Kxa6 7.f4 Kb6 8.f5 Kc7 9.Kd5 a5 10.f6 Kd7 (905.212.116) 9677
 31/67	 2:09 	+4.18++	1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kc3 4.Ke4 Kc4 5.Kxf3 Kb5 6.Ke4 Kxa6 7.f4 Kb6 8.f5 Kc7 9.Kd5 a5 10.f6 Kd7 (1.232.771.099) 9491
 31/67	 3:50 	+5.03++	1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kc3 4.Ke4 Kc4 5.Kxf3 Kb5 6.Ke4 Kxa6 7.f4 Kb6 8.f5 Kc7 9.Kd5 a5 10.f6 Kd7 (2.176.355.959) 9444
Stockfish is indeed very good in endgames that require deep analysis, because of its aggressive pruning it goes deeper than most other engines.

Robert
It is not correct solution. Houdini has a problem with 6th white move (pawn endgames).
[d] 8/p7/P7/1k6/8/5K2/5P2/8 w - -
Correct is 6.Kg4 (!) instead of 6.Ke4 (??) which leads to draw. :lol:
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: pawn racing

Post by lech »

mhalstern wrote:Zappa Mexico II takes a little more than 1 minute:

New game
8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - - 0 1

Analysis by Zappa Mexico II 64:

1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kd6 Nd4 6.Bd7 Kd3 7.f4
+- (1.63) Depth: 13/29 00:00:00 1555kN, tb=218
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kd6 Nd4 6.Bd7 Kd3 7.f4
+- (1.63) Depth: 13/29 00:00:00 1642kN, tb=281
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kd6 Nd4 6.Bd7 Kd3 7.f4
+- (1.63) Depth: 14/29 00:00:00 1958kN, tb=315
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kd6 Nd4 6.Bd7 Kd3 7.f4
+- (1.63) Depth: 14/29 00:00:00 2051kN, tb=397
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kc7 Nd4 6.Bd7 Nf3 7.Kb7 Ke1
+- (1.94) Depth: 15/29 00:00:01 3364kN, tb=589
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nc2 5.Kc7 Nd4 6.Bd7 Nf3 7.Kb7 Ke1
+- (1.94) Depth: 15/29 00:00:01 3675kN, tb=721
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nd5 5.Kd6 Nf4 6.Ke5 Ng6+ 7.Ke4 Kc3 8.Bd7 Nf8 9.Bf5
+- (2.00) Depth: 16/34 00:00:01 5567kN, tb=1133
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Nd5 5.Kd6 Nf4 6.Ke5 Ng6+ 7.Ke4 Kc3 8.Bd7 Nf8 9.Bf5
+- (2.00) Depth: 16/34 00:00:01 6413kN, tb=1530
1.Be4 Nxc2 2.Bxf3 Kd2 3.Bb7 Ke2 4.f4 Nd4 5.Kd6 Nf5+ 6.Ke5 Nh6 7.f5 Ke3 8.Bc8 Nxf5 9.Bxf5
+- (2.81) Depth: 17/38 00:00:04 17599kN, tb=6167
1.Be4 Nxc2 2.Bxf3 Kd2 3.Bb7 Ke2 4.f4 Nd4 5.Kd6 Nf5+ 6.Ke5 Nh6 7.f5 Ke3 8.Bc8 Nxf5 9.Bxf5
+- (2.81) Depth: 17/38 00:00:04 18915kN, tb=6728
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Be2 Nc6 8.Bf1 Kd6 9.Bb5 Nd4 10.Ba4 Ne6 11.Kxa7
+- (4.44) Depth: 18/55 00:00:10 45282kN, tb=20455
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Be2 Nc6 8.Bf1 Kd6 9.Bb5 Nd4 10.Ba4 Ne6 11.Kxa7
+- (4.44) Depth: 18/55 00:00:10 46750kN, tb=20833
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.f3 Kc6 10.f4 Kd7 11.Bc4 Ke7 12.Kb7 Nc2
+- (4.77) Depth: 19/55 00:00:12 56792kN, tb=28836
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.f3 Kc6 10.f4 Kd7 11.Bc4 Ke7 12.Kb7 Nc2
+- (4.77) Depth: 19/55 00:00:13 58914kN, tb=29482
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.f3 Kc6 10.f4 Kd7 11.Bc4 Ke7 12.Kb7 Nc2
+- (4.77) Depth: 20/55 00:00:15 69445kN, tb=37131
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.f3 Kc6 10.f4 Kd7 11.Bc4 Ke7 12.Kb7 Nc2
+- (4.77) Depth: 20/55 00:00:16 73722kN, tb=40094
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.Bc4 Nc6+ 10.Ka8 Na7 11.Kxa7 Kd6
+- (4.89) Depth: 21/55 00:00:23 107mN, tb=67293
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.Bc4 Nc6+ 10.Ka8 Na7 11.Kxa7 Kd6
+- (4.89) Depth: 21/55 00:00:26 126mN, tb=81080
1.Be4 Nxc2 2.Bxf3 Nb4 3.Be2 Kd2 4.Bb5 Kc3 5.Kc8 Kd4 6.Kb7 Kc5 7.Bf1 Kd6 8.Kxa7 Kc7 9.Bc4 Nc6+
+- (4.89) Depth: 22/55 00:00:37 184mN, tb=120156
1.Kd6 Kb4 2.Bd3 Ne2 3.Kc6 Nd4+ 4.Kb7 Kc5 5.c3 Ne2 6.Kxa7 Nxc3 7.Kb8 Kd4 8.Bc2 Nb5 9.Ba4 Nc3 10.a7 Kd3 11.Bc6
+- (6.98) Depth: 22/55 00:00:59 325mN, tb=177023
1.Kd6 Kb4 2.Bd3 Ne2 3.Kc6 Nd4+ 4.Kb7 Kc5 5.c3 Ne2 6.Kxa7 Nxc3 7.Kb8 Kd4 8.Bc2 Nb5 9.Ba4 Nc3 10.a7 Kd3 11.Bc6
+- (6.98) Depth: 22/55 00:01:00 336mN, tb=186807
1.Kd6 Kb4 2.Bd3 Kc3 3.Kd5 Ne2 4.Kc6 Nf4 5.Be4 Kd4 6.Bxf3 Ke5 7.Kb7 Kd6 8.Kxa7 Kc7 9.Ka8 Ng6 10.Bd5 Nf8 11.f4 Ng6 12.f5 Ne5 13.Ka7 Nd7
+- (7.19) Depth: 23/65 00:01:13 422mN, tb=202056
1.Kd6 Kb4 2.Bd3 Kc3 3.Bg6
+- (7.19) Depth: 23/65 00:01:19 459mN, tb=228505
1.Kd6 Kb4 2.Bd3 Kc3 3.Kd5 Ne2 4.Kc6 Nf4 5.Bh7 Nh3 6.Be4 Ng5 7.Bxf3 Nxf3 8.Kb7 Ne5 9.Kxa7 Kd2 10.Kb7 Nc4
+- (10.84) Depth: 24/67 00:02:06 770mN, tb=376024
1.Kd6 Kb4 2.Bd3 Kc3 3.Kd5 Ne2 4.Kc6 Nf4 5.Bh7 Nh3 6.Be4 Ng5 7.Bxf3 Nxf3 8.Kb7 Ne5 9.Kxa7 Kd2 10.Ka8 Ke2
+- (10.84) Depth: 24/67 00:02:14 826mN, tb=407380
1.Kd6 Kb4 2.Bd3 Kc3 3.Kd5 Ne2 4.Kc6 Nf4 5.Bh7 Nh3 6.Be4 Kd2 7.Kb7 Ng5 8.Bf5 Ke1 9.Kxa7 Kxf2 10.Bd3 Nh3 11.Kb6 Nf4 12.a7 Nd5+ 13.Kb7 Ne3 14.a8Q Kg1 15.Qa1+ Nf1 16.Bxf1
+- (12.03) Depth: 25/69 00:03:33 1349mN, tb=587830
Thanks Marc!
Zappa Mexico gives very high score for 1.Be4 which leads to draw :cry:
[d]8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - -
1.Be4 (??) Sxc2 2.Bxf3 Sb4 3.Be2 Kd4 4.Kc7 Kc5 5.Kb7 Kd6 =
[d] 8/pK6/P2k4/8/1n6/8/4BP2/8 w - -
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User avatar
michiguel
Posts: 6401
Joined: Thu Mar 09, 2006 8:30 pm
Location: Chicago, Illinois, USA

Re: pawn racing

Post by michiguel »

lech wrote:[d] 8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - -
1.Kd6!
Which engine is able to find this solution faster than others? :D
With TBs Gaviota sees Kd6 in 0.2 seconds

Code: Select all

setboard 8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - - 
d
+-----------------+
| . . . . . . . . |
| p . . K . . . . |
| P . . . . . B . |
| . . . . . . . . |    Castling: 
| . . . n . . . . |    ep: -
| . . k . . p . . |
| . . P . . P . . |
| . . . . . . . . | [White]
+-----------------+

analyze
********* Starts iterative deepening, thread = 0
set timer to infinite
        17   1:      0.0    +0.99  1.Be4
       102   2:      0.0    +0.85  1.Be4 Kd2
       416   3:      0.0    +0.96  1.Be4 Kc4 2.Kd6
      2900   4:      0.0    +0.85  1.Kc7 Kd2 2.c4 Ke1 3.Kb7
      9672   5:      0.0    +0.99  1.Be4 Kd2 2.Ke7 Kc3 3.Kd6
     13867   6       0.1    +0.76  1.Be4 Kd2 2.Kd6 Nxc2 3.Bxf3 Nd4
     20207   6       0.1    +0.89  1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Ne6 4.Kxa7
                                   Kxf2
     24360   6:      0.1    +0.89  1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Ne6 4.Kxa7
                                   Kxf2
     36229   7       0.2    +0.86  1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Nb5 4.c4 Nd4
     43899   7       0.2    +0.87  1.Be4 Kd2 2.Kd6 Nxc2 3.Bxf3 Nd4 4.Bd5
     58096   7       0.2    +0.92  1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kd3 4.Kf4
                                   Ke2 5.Kg3 Kd3 6.Kxf3
     64824   7:      0.2    +0.92  1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kd3 4.Kf4
                                   Ke2 5.Kg3 Kd3 6.Kxf3
    110176   8       0.3    +1.02  1.Kd6 Kd2 2.Ke5 Kc3 3.Kf4 Kc4 4.Bd3+
                                   Kc3 5.Ke3
    135133   8:      0.4    +1.02  1.Kd6 Kd2 2.Ke5 Kc3 3.Kf4 Kc4 4.Bd3+
                                   Kc3 5.Ke3
    220659   9       0.5    +1.09  1.Kd6 Kd2 2.Ke5 Ne2 3.Be4 Ke1 4.Bxf3
                                   Nc3 5.Kd4 Kxf2 6.Kxc3 Kxf3
    284364   9:      0.6    +1.09  1.Kd6 Kd2 2.Ke5 Ne2 3.Be4 Ke1 4.Bxf3
                                   Nc3 5.Kd4 Kxf2 6.Kxc3 Kxf3
    421979  10       0.9    +1.09  1.Kd6 Kd2 2.Ke5 Ne2 3.Be4 Ke1 4.Bxf3
                                   Nc3 5.Kd4 Kxf2 6.Kxc3 Kxf3
    832308  10:      1.6    +1.09  1.Kd6 Kd2 2.Ke5 Ne2 3.Be4 Ke1 4.Bxf3
                                   Nc3 5.Kd4 Kxf2 6.Kxc3 Kxf3
   1259951  11       2.3    +1.14  1.Kd6 Kd2 2.Ke5 Ne2 3.Ke4 Kxc2 4.Kxf3+
                                   Kd2 5.Bf7 Ke1 6.Ke3 Nc3
   1541956  11:      2.8    +1.14  1.Kd6 Kd2 2.Ke5 Ne2 3.Ke4 Kxc2 4.Kxf3+
                                   Kd2 5.Bf7 Ke1 6.Ke3 Nc3
   2364985  12       4.3      :-)  1.Kd6
   3114336  12       5.5    +1.46  1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Ke1 4.Ke3
                                   Ne5 5.Bd3 Ng4+ 6.Kf4 Nxf2 7.Kxf3 Nd1
   4213197  12:      7.4    +1.46  1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Ke1 4.Ke3
                                   Ne5 5.Bd3 Ng4+ 6.Kf4 Nxf2 7.Kxf3 Nd1
   7798005  13      13.3    +1.61  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Ne2 4.Bxf3
                                   Nc1 5.Kf5 Kxf2 6.Kf4 Na2 7.Bd5
   8921788  13:     15.0    +1.61  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Ne2 4.Bxf3
                                   Nc1 5.Kf5 Kxf2 6.Kf4 Na2 7.Bd5
  15314233  14      24.6    +1.49  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Ne2 4.Bxf3
                                   Nc1 5.Bd5 Kxf2 6.Ke4 Ke1 7.Bc4 Kd2
  20666339  14:     33.6    +1.49  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Ne2 4.Bxf3
                                   Nc1 5.Bd5 Kxf2 6.Ke4 Ke1 7.Bc4 Kd2
  36690620  15      59.6      :-)  1.Kd6
  76292408  15     124.5    +2.52  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nc3 6.Bxf3 Ke3 7.Kxa7 Kd2
                                   8.Kb6 Kxc2
  84562374  15:    138.6    +2.52  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nc3 6.Bxf3 Ke3 7.Kxa7 Kd2
                                   8.Kb6 Kxc2
 138645492  16     231.6      :-)  1.Kd6
 181963019  16     304.9    +2.94  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nd4 6.Kxa7 Ke3 7.Bxf3 Kf4
                                   8.c4 Ne6
 208830325  16:    359.2    +2.94  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nd4 6.Kxa7 Ke3 7.Bxf3 Kf4
                                   8.c4 Ne6
 375063002  17     666.5    +3.09  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nc3 6.Bxf3 Na4 7.Kxa7 Nc5
                                   8.Bd5 Ke3 9.Kb6
 487453836  17:    904.1    +3.09  1.Kd6 Kd2 2.Kd5 Ne2 3.Kc6 Ke1 4.Kb7
                                   Kxf2 5.Be4 Nc3 6.Bxf3 Na4 7.Kxa7 Nc5
                                   8.Bd5 Ke3 9.Kb6
53 seconds without them

Code: Select all

d
+-----------------+
| . . . . . . . . |
| p . . K . . . . |
| P . . . . . B . |
| . . . . . . . . |    Castling: 
| . . . n . . . . |    ep: -
| . . k . . p . . |
| . . P . . P . . |
| . . . . . . . . | [White]
+-----------------+

clearbrain
tbuse off
analyze
********* Starts iterative deepening, thread = 0
set timer to infinite
        17   1:      0.0    +0.99  1.Be4
       102   2:      0.0    +0.85  1.Be4 Kd2
       416   3:      0.0    +0.96  1.Be4 Kc4 2.Kd6
      2809   4:      0.0    +0.85  1.Kc7 Kd2 2.c4 Ke1 3.Kb7
      9628   5:      0.0    +0.99  1.Be4 Kd2 2.Ke7 Kc3 3.Kd6
     13734   6       0.0    +0.76  1.Be4 Kd2 2.Kd6 Nxc2 3.Bxf3 Nd4
     21459   6       0.0    +1.00  1.Kc7 Kd2 2.Bd3 Ne6+ 3.Kb8 Ke1 4.c3
     25204   6:      0.0    +1.00  1.Kc7 Kd2 2.Bd3 Ne6+ 3.Kb8 Ke1 4.c3
     39020   7       0.1    +0.86  1.Kc7 Kd2 2.Kb7 Ke2 3.c3 Nb5 4.c4 Nd4
     46971   7       0.1    +0.87  1.Be4 Kd2 2.Kd6 Nxc2 3.Bxf3 Nd4 4.Bd5
     61896   7       0.1    +0.92  1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kd3 4.Kf4
                                   Kc4 5.Kxf3 Kd5
     68771   7:      0.1    +0.92  1.Kd6 Nxc2 2.Bxc2 Kxc2 3.Ke5 Kd3 4.Kf4
                                   Kc4 5.Kxf3 Kd5
    108662   8       0.2    +0.93  1.Kd6 Kd2 2.Ke5 Nxc2 3.Bxc2 Kxc2 4.Kf4
                                   Kc3 5.Kxf3 Kd3 6.Kf4
    138713   8:      0.2    +0.93  1.Kd6 Kd2 2.Ke5 Nxc2 3.Bxc2 Kxc2 4.Kf4
                                   Kc3 5.Kxf3 Kd3 6.Kf4
    264693   9       0.4      :-(  1.Kd6
    377907   9       0.6    +1.00  1.Kc7 Kd2 2.Kb7 Ke1 3.Kxa7 Kxf2 4.Kb6
                                   Ke1 5.a7 f2 6.a8=Q f1=Q
    433124   9:      0.7    +1.00  1.Kc7 Kd2 2.Kb7 Ke1 3.Kxa7 Kxf2 4.Kb6
                                   Ke1 5.a7 f2 6.a8=Q f1=Q
    659196  10       1.1      :-)  1.Kc7
    895466  10       1.5      :-)  1.Kc7
   1304146  10       2.1    +3.23  1.Kc7 Kd2 2.Kb7 Nb5 3.c4 Nd6+ 4.Kxa7
                                   Ke2 5.Kb8 Nxc4 6.a7 Nb6 7.Kb7
   1434220  10:      2.3    +3.23  1.Kc7 Kd2 2.Kb7 Nb5 3.c4 Nd6+ 4.Kxa7
                                   Ke2 5.Kb8 Nxc4 6.a7 Nb6 7.Kb7
   2753755  11       4.3    +3.27  1.Kc7 Ne6+ 2.Kb7 Kb4 3.Kxa7 Ka5 4.Be4
                                   Nc7 5.Bd3 Nd5 6.Kb7 Ka4
   3170115  11:      4.9    +3.27  1.Kc7 Ne6+ 2.Kb7 Kb4 3.Kxa7 Ka5 4.Be4
                                   Nc7 5.Bd3 Nd5 6.Kb7 Ka4
   5702115  12       8.7    +3.54  1.Kc7 Kc4 2.Kb7 Kc5 3.Kxa7 Kc6 4.Be4+
                                   Kc7 5.c4 Nb3 6.Bxf3 Nc5 7.Bd5
   6877970  12:     10.3    +3.54  1.Kc7 Kc4 2.Kb7 Kc5 3.Kxa7 Kc6 4.Be4+
                                   Kc7 5.c4 Nb3 6.Bxf3 Nc5 7.Bd5
  11216426  13      16.5      :-(  1.Kc7
  14153781  13      20.6      :-(  
  16600023  13      24.0      :-(  1.Kc7
  21543488  13      30.9      :-(  
  25092391  13      36.1    +1.02  1.Kc7 Nxc2 2.Bxc2 Kxc2 3.Kb7 Kd3 4.Kxa7
                                   Ke2 5.Kb6 Kxf2 6.a7 Kg1 7.a8=R f2
                                   8.Rg8+ Kh2
  37127901  13      53.4    +1.39  1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Ke2 4.Kg3
                                   Kd2 5.Bd3 Nd4 6.Kf4 Ne6+ 7.Kxf3 Nc5
                                   8.Bf5 Nxa6
  38521097  13:     55.3    +1.39  1.Kd6 Kd2 2.Ke5 Nc6+ 3.Kf4 Ke2 4.Kg3
                                   Kd2 5.Bd3 Nd4 6.Kf4 Ne6+ 7.Kxf3 Nc5
                                   8.Bf5 Nxa6
  47462727  14      68.4    +1.42  1.Kd6 Kd2 2.Bd3 Ke1 3.Kc7 Kxf2 4.Kb7
                                   Ke3 5.Kxa7 Ne2 6.Kb6 f2 7.a7 f1=Q
                                   8.a8=Q Qf6+ 9.Qc6 Qxc6+ 10.Kxc6
  52793170  14:     76.2    +1.42  1.Kd6 Kd2 2.Bd3 Ke1 3.Kc7 Kxf2 4.Kb7
                                   Ke3 5.Kxa7 Ne2 6.Kb6 f2 7.a7 f1=Q
                                   8.a8=Q Qf6+ 9.Qc6 Qxc6+ 10.Kxc6
  86930930  15     125.8    +1.53  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Nxc2 4.Bxc2
                                   Kxf2 5.Be4 Ke2 6.Bc6 f2 7.Bb5+ Ke1
                                   8.Kd6 Kd2 9.Bc4
  96497475  15:    139.5    +1.53  1.Kd6 Kd2 2.Be4 Ke1 3.Ke5 Nxc2 4.Bxc2
                                   Kxf2 5.Be4 Ke2 6.Bc6 f2 7.Bb5+ Ke1
                                   8.Kd6 Kd2 9.Bc4
Last edited by michiguel on Tue Jun 22, 2010 3:02 pm, edited 1 time in total.
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User avatar
Houdini
Posts: 1471
Joined: Tue Mar 16, 2010 12:00 am

Re: pawn racing

Post by Houdini »

lech wrote:It is not correct solution. Houdini has a problem with 6th white move (pawn endgames).
Of course, the line shown is not Houdini's final analysis - as you can see from the ++ in the score we're still in a fail high condition, or in other words, the PV shown is meaningless.
To get the full main line longer analysis is needed.
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Robert Flesher
Posts: 1280
Joined: Tue Aug 18, 2009 3:06 am

Re: pawn racing

Post by Robert Flesher »

lech wrote:[d] 8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - -
1.Kd6!
Which engine is able to find this solution faster than others? :D


Shredder 12 finds it instantly!




25 0:05 +4.96 1.Kd6 Kc4 2.Kc7 Kb5 3.Kb7 Ne6 4.Bd3+ Kc5 5.Bf5 Nd4 6.Be4
average search depth 25 half-moves after 0:04 min; evaluation +4.96 means white has decisive


after more time :



8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - -

Engine: Deep Shredder 12 x64 (512 MB)
by Stefan Meyer-Kahlen

29/55 2:18 +13.03 1.Kd6 Kc4 2.Bd3+ Kb4 3.Kd5 Ne2 4.Kc6 Nd4+
5.Kb7 Kc5 6.c3 Ne6 7.Bf5 Ng7 8.Bg4 Kd6
9.c4 Ne8 10.Bxf3 Nf6 11.c5+ Ke7
12.Kxa7 Nd7 13.Kb7 Nxc5+ 14.Kb6 (542.872.472) 3928
SB:21.540.796
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User avatar
Andres Valverde
Posts: 557
Joined: Sun Feb 18, 2007 11:07 pm
Location: Almeria. SPAIN

Re: pawn racing

Post by Andres Valverde »

Dirty 6J-22 finds it quite fast :


FEN: 8/p2K4/P5B1/8/3n4/2k2p2/2P2P2/8 w - - 0 1

Dirty 6J-22:
1 00:00 4 4 +0,56 Bd3
1 00:00 9 9 +0,74 Be4
1 00:00 20 20 +0,74 Be4
2 00:00 43 43 +0,82 Be4 Kc4
2 00:00 89 89 +0,82 Be4 Kc4
3 00:00 171 171 +0,91 Be4 Kc4 Kd6
3 00:00 278 278 +0,91 Be4 Kc4 Kd6
4 00:00 410 410 +0,98 Be4 Kc4 Kd6 Kc3
4 00:00 718 718 +0,98 Be4 Kc4 Kd6 Kc3
5 00:00 1.053 1.053 +1,06 Be4 Kc4 Kd6 Kc3 Ke5
5 00:00 1.810 1.810 +1,06 Be4 Kc4 Kd6 Kc3 Ke5
6 00:00 2.699 2.699 +1,14 Be4 Kc4 Kd6 Kb4 Ke5 Kc3
6 00:00 7.357 735.700 +1,36 Kc7 Kd2 c4 Ke1 Kb8 Kxf2
6 00:00 7.862 786.200 +1,36 Kc7 Kd2 c4 Ke1 Kb8 Kxf2
7 00:00 9.210 921.000 +1,36 Kc7 Kd2 c4 Ke1 Kb8 Kxf2 Kxa7
7 00:00 11.058 1.105.800 +1,36 Kc7 Kd2 c4 Ke1 Kb8 Kxf2 Kxa7
8 00:00 18.419 613.966 +1,42 Kc7 Kd2 Kb7 Ke2 c3 Ne6 Bf5 Nf4
8 00:00 22.841 571.025 +1,42 Kc7 Kd2 Kb7 Ke2 c3 Ne6 Bf5 Nf4
9 00:00 31.713 528.550 +1,42 Kc7 Kd2 Kb7 Ne6 Kxa7 Ke1 Kb8 Kxf2 a7 Nd4 a8=Q
9 00:00 44.031 366.925 +1,42 Kc7 Kd2 Kb7 Ne6 Kxa7 Ke1 Kb8 Kxf2 a7 Nd4 a8=Q
10 00:00 86.294 345.176 +0,70 Kc7 Nxc2 Kb7 Nb4 Be4 Kd2 Bxf3 Ke1 Be4 Kxf2
10 00:00 151.781 433.660 +1,32 Kd6 Ne2 Be4 Ng1 Bf5 Kd2 Kc6 Ne2 Kd5 Nc3+ Kd4
10 00:00 164.734 411.835 +1,32 Kd6 Ne2 Be4 Ng1 Bf5 Kd2 Kc6 Ne2 Kd5 Nc3+ Kd4
11 00:00 266.497 397.756 +0,53 Kd6 Nxc2 Be4 Ne1 Kc7 Nd3 Bxf3 Nxf2 Kd6 Kd4 Ke6
11 00:00 351.522 390.580 +0,98 Be4 Nxc2 Bxf3 Nb4 Be2 Kd4 Kd6 Ke4 Bc4 Nxa6 Bd5+ Kd4 f4 Nb4
11 00:00 368.149 387.525 +0,98 Be4 Nxc2 Bxf3 Nb4 Be2 Kd4 Kd6 Ke4 Bc4 Nxa6 Bd5+ Kd4 f4 Nb4
12 00:01 410.011 376.156 +1,06 Be4 Nxc2 Bxf3 Nb4 Be2 Kd4 Kd6 Ke4 Bc4 Nxa6 Bd5+ Kf4 f3
12 00:01 451.156 366.793 +1,06 Be4 Nxc2 Bxf3 Nb4 Be2 Kd4 Kd6 Ke4 Bc4 Nxa6 Bd5+ Kf4 f3
13 00:01 550.190 329.455 +1,00 Be4 Nxc2 Bxf3 Nb4 Bb7 Kd4 Kd6 Nd3 f3 Nb4 Be4 Nxa6 Bd5 Nb4
13 00:02 1.051.055 370.089 +2,21 Kd6 Kd2 Be4 Kc3 Kd5 Ne2 Bxf3 Nf4+ Kc6 Ne6 Kd6 Nd4 Be4 Nxc2 Bxc2 Kd4 Kc7 Kc3 f4 Kd2 Be4
13 00:03 1.111.785 338.958 +2,21 Kd6 Kd2 Be4 Kc3 Kd5 Ne2 Bxf3 Nf4+ Kc6 Ne6 Kd6 Nd4 Be4 Nxc2 Bxc2 Kd4 Kc7 Kc3 f4 Kd2 Be4
14 00:03 1.300.902 336.150 +2,09 Kd6 Kd2 Be4 Kc3 Kd5 Nb5 Bxf3 Nc7+ Ke5 Nxa6 Be4 Nb4 f4 a5 f5
14 00:06 1.494.584 239.133 +2,09 Kd6 Kd2 Be4 Kc3 Kd5 Nb5 Bxf3 Nc7+ Ke5 Nxa6 Be4 Nb4 f4 a5 f5
15 00:14 3.153.478 217.481 +2,80 Kd6 Kc4 Bd3+ Kc3 Be4 Kb4 Kc7 Kc5 Kb7 Kd6 Kb8 Ke5 Kb7 Kxe4 Kxa7 Nb5+ Kb6 Nd6 a7 Nc8+ Kc7 Nxa7 Kb8 Kd4
Saludos, Andres
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