Test Position: Lemming disease (avoid move)

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

Moderators: hgm, Rebel, chrisw

Albert Silver
Posts: 3019
Joined: Wed Mar 08, 2006 9:57 pm
Location: Rio de Janeiro, Brazil

Test Position: Lemming disease (avoid move)

Post by Albert Silver »

This blunder was played by one of the clones in a fast game. I found it interesting to note that many engines take more or less time to reject it, so developers might wish to add it to their 'avoid move' test positions:

[D]8/8/1r1p4/3Ppk1p/1PR5/5P2/6K1/8 w - - 0 48

The move to avoid is 1.Rc6?? which loses immediately to 1...Rxc6. Note that some engines don't play it at first but then actually switch to it.
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."
Top
Dirt
Posts: 2851
Joined: Wed Mar 08, 2006 10:01 pm
Location: Irvine, CA, USA

Re: Test Position: Lemming disease (avoid move)

Post by Dirt »

Crafty 23.1 finds this difficult. It takes until ply 23 to see Rc6 is bad. It thinks for a long time that black shouldn't exchange rooks, probably because it thinks the connected passed pawns look scary.
Top
Kurt Utzinger
Posts: 169
Joined: Sun May 11, 2008 10:31 pm
Location: Switzerland

Re: Test Position: Lemming disease (avoid move)

Post by Kurt Utzinger »

Here the analysis of Deep Shredder 12 Linux:

Deep Shredder 12 .

+̿ (-0.30) 28/28 48.Th4(1/21) 2500 kn/s

48.Th4 Kg5 49.Kg3 Tb5 50.f4+ Kg6 51.fxe5 dxe5 52.d6 Td5 53.Te4 Kf5 54.Th4 Kg5 55.Te4 Td3+ 56.Kf2 Kf5
3:19 27/53 SB:13307
Top
De Vos W
Posts: 431
Joined: Tue Dec 01, 2009 11:59 am

Re: Test Position: Lemming disease (avoid move)

Post by De Vos W »

Albert Silver wrote:This blunder was played by one of the clones in a fast game. I found it interesting to note that many engines take more or less time to reject it, so developers might wish to add it to their 'avoid move' test positions:

[D]8/8/1r1p4/3Ppk1p/1PR5/5P2/6K1/8 w - - 0 48

The move to avoid is 1.Rc6?? which loses immediately to 1...Rxc6. Note that some engines don't play it at first but then actually switch to it.
One of the clones? Not this one! And i have no proof its a clone, if you have
the proof, let us know Mr. Silver.

New game
8/8/1r1p4/3Ppk1p/1PR5/5P2/6K1/8 w - - 0 1

Analysis by FireBird 1.1 w32:

1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5
= (-0.24) Depth: 6 00:00:00 2kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (-0.16) Depth: 6 00:00:00 4kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (-0.16) Depth: 6 00:00:00 4kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (-0.08 ++) Depth: 7 00:00:00 5kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (-0.08 ++) Depth: 7 00:00:00 5kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (0.00 ++) Depth: 7 00:00:00 6kN
1.Rc6 Rxb4 2.Rxd6 Kf4 3.Re6 Rb2+ 4.Kh3
= (0.00 ++) Depth: 7 00:00:00 6kN
1.Rc6 Rxb4 2.Rxd6 Rb2+ 3.Kg3 e4 4.fxe4+ Kxe4 5.Rd8
= (0.03) Depth: 7 00:00:00 7kN
1.Rc6 Rxb4 2.Rxd6 Rb2+ 3.Kg3 e4 4.fxe4+ Kxe4 5.Rd8
= (0.03) Depth: 7 00:00:00 7kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kh3
= (-0.02) Depth: 8 00:00:00 11kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kh3
= (-0.02) Depth: 8 00:00:00 11kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kh3 Rg4
= (-0.03) Depth: 9 00:00:00 15kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kh3 Rg4
= (-0.03) Depth: 9 00:00:00 16kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Rg4+ 6.Kf3 Ke6 7.Rh8 Kxd6 8.Rh6+ Ke7 9.Rxh5
= (-0.03) Depth: 10 00:00:00 26kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Rg4+ 6.Kf3 Ke6 7.Rh8 Kxd6 8.Rh6+ Ke7 9.Rxh5
= (-0.03) Depth: 10 00:00:00 28kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kg3 Ra4 7.Kh3 Rg4
= (-0.03) Depth: 11 00:00:00 41kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rd8 Ke5 5.d6 Ke6 6.Kg3 Ra4 7.Kh3 Rg4
= (-0.03) Depth: 11 00:00:00 44kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rh6 Rb2+ 5.Kg3 Rb3+ 6.Kf2 Kxd5 7.Rxh5+ Ke4 8.Rh4+ Kf5 9.Rh5+ Kg4
= (-0.03) Depth: 12 00:00:00 91kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rh6 Rb2+ 5.Kg3 Rb3+ 6.Kf2 Kxd5 7.Rxh5+ Ke4 8.Rh4+ Kf5 9.Rh5+ Kg4
= (-0.03) Depth: 12 00:00:00 94kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rh6 Rb2+ 5.Kg3 Rb3+ 6.Kh4 Kxd5 7.Rxh5+ Ke4 8.Ra5 Rb1 9.Ra4+ Kd5
= (-0.03) Depth: 13 00:00:00 149kN
1.Rc6 Rxb4 2.Rxd6 e4 3.fxe4+ Kxe4 4.Rh6 Rb2+ 5.Kg3 Rb3+ 6.Kh4 Kxd5 7.Rxh5+ Ke4 8.Ra5 Rb1 9.Ra4+ Kd5
= (-0.03) Depth: 13 00:00:00 155kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.d6 Rd5 5.Kg3 Ke6 6.Re8+ Kxd6 7.Rh8 Rd4 8.Rxh5 Rd3 9.Rh8 Ke6 10.Rh6+ Kf5
= (-0.10) Depth: 14 00:00:00 368kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.d6 Rd5 5.Kg3 Ke6 6.Re8+ Kxd6 7.Rh8 Rd4 8.Rxh5 Rd3 9.Rh8 Ke6 10.Rh6+ Kf5
= (-0.10) Depth: 14 00:00:00 390kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 15 00:00:00 551kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 15 00:00:00 576kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 16 00:00:00 734kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 16 00:00:00 763kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 17 00:00:00 1022kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Kf2 Kf4 5.Rf8+ Kg5 6.Rg8+ Kf6 7.Rf8+ Ke7 8.Rh8 Kd6 9.Rxh5 Rc3 10.Rh7 Kxd5 11.Rd7+ Ke6
= (-0.07) Depth: 17 00:00:00 1056kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kf5
= (-0.07) Depth: 18 00:00:00 1661kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kf5
= (-0.07) Depth: 18 00:00:00 1711kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kg5 7.Rd8 Kf5 8.Rf8+ Kg6 9.Rd8 Rd4 10.d6 Kf6 11.d7 Rd5 12.f4 e4 13.Rf8+ Ke7 14.Re8+ Kxd7 15.Rxe4 Rd3 16.f5 Rg3+ 17.Kh2
= (-0.07) Depth: 19 00:00:01 2244kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kg5 7.Rd8 Kf5 8.Rf8+ Kg6 9.Rd8 Rd4 10.d6 Kf6 11.d7 Rd5 12.f4 e4 13.Rf8+ Ke7 14.Re8+ Kxd7 15.Rxe4 Rd3 16.f5 Rg3+ 17.Kh2
= (-0.07) Depth: 19 00:00:01 2323kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kg5 7.Rd8 Rd2+ 8.Kh3 Rd3 9.Kg2
= (-0.07) Depth: 20 00:00:01 2799kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Rd3 4.Rd6 h4 5.Rd8 Kf6 6.Rd6+ Kg5 7.Rd8 Rd2+ 8.Kh3 Rd3 9.Kg2
= (-0.07) Depth: 20 00:00:01 2931kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
= (-0.15 --) Depth: 21 00:00:04 9264kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
= (-0.23 --) Depth: 21 00:00:05 11587kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
=/+ (-0.35 --) Depth: 21 00:00:06 14362kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh7 Re4+ 13.Kd3 Rg4 14.Rh5 Rc4
=/+ (-0.33) Depth: 21 00:00:10 24886kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh7 Re4+ 13.Kd3 Rg4 14.Rh5 Rc4
=/+ (-0.33) Depth: 21 00:00:10 24912kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh7 Re4+ 13.Kd3 Re1 14.Kc3 Rb1 15.Rh6+ Kc5
=/+ (-0.33) Depth: 22 00:00:11 26071kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh7 Re4+ 13.Kd3 Re1 14.Kc3 Rb1 15.Rh6+ Kc5
=/+ (-0.33) Depth: 22 00:00:11 27113kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 23 00:00:13 30848kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 23 00:00:15 35033kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 24 00:00:16 37513kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 24 00:00:19 43596kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 25 00:00:22 50495kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Re4+ 13.Kd3 Kc6 14.Rc8+ Kb5 15.Rd8 Kc5 16.Rc8+ Kd6
=/+ (-0.31) Depth: 25 00:00:26 61390kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Ke6 16.Rh6+ Ke5 17.Rh5+ Kd6 18.Rh8
=/+ (-0.31) Depth: 26 00:00:31 72845kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Ke6 16.Rh6+ Ke5 17.Rh5+ Kd6 18.Rh8
=/+ (-0.31) Depth: 26 00:00:40 92902kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Kc6 16.Rf8 Re4 17.Rc8+ Kb5 18.Rd8 Kc5 19.Rc8+ Kb5
=/+ (-0.31) Depth: 27 00:00:46 105mN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Kc6 16.Rf8 Re4 17.Rc8+ Kb5 18.Rd8 Kc5 19.Rc8+ Kb5
=/+ (-0.31) Depth: 27 00:00:59 137mN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Re4 16.Rd8+ Kc5 17.Rc8+ Kb5 18.Rb8+ Kc6 19.Rh8 Kd6
=/+ (-0.31) Depth: 28 00:01:08 157mN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh8 Kc6 13.Kd3 Kc5 14.Rc8+ Kd6 15.Rh8 Re4 16.Rd8+ Kc5 17.Rc8+ Kb5 18.Rb8+ Kc6 19.Rh8 Kd6
=/+ (-0.31) Depth: 28 00:01:32 213mN

( 06.06.2010)
Top
Gian-Carlo Pascutto
Posts: 1243
Joined: Sat Dec 13, 2008 7:00 pm

Re: Test Position: Lemming disease (avoid move)

Post by Gian-Carlo Pascutto »

De Vos W wrote: One of the clones? Not this one! And i have no proof its a clone, if you have
the proof, let us know Mr. Silver.

Analysis by FireBird 1.1 w32:
The authors webpage says so, what more do you want?
Top
Carlos Ylich
Posts: 175
Joined: Wed Apr 28, 2010 9:31 pm
Location: Brazil

Re: Test Position: Lemming disease (avoid move)

Post by Carlos Ylich »

The thing about all this that makes me disagree with you. I still do not know what it is, but reflecting on the facts, I can not agree with you. I believe the family Ippolit programs are not clones, but do not have evidence or confirmation of this. Entertaining, did not possess that are clones. The wise man in such cases, nothing speaks, watch and wait. Worse than a true late is injustice in advance.
Carlos Ylich
from Brazil.
Top
Albert Silver
Posts: 3019
Joined: Wed Mar 08, 2006 9:57 pm
Location: Rio de Janeiro, Brazil

Re: Test Position: Lemming disease (avoid move)

Post by Albert Silver »

De Vos W wrote:
Albert Silver wrote:This blunder was played by one of the clones in a fast game. I found it interesting to note that many engines take more or less time to reject it, so developers might wish to add it to their 'avoid move' test positions:

[D]8/8/1r1p4/3Ppk1p/1PR5/5P2/6K1/8 w - - 0 48

The move to avoid is 1.Rc6?? which loses immediately to 1...Rxc6. Note that some engines don't play it at first but then actually switch to it.
One of the clones? Not this one!

Analysis by FireBird 1.1 w32:

1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
= (-0.15 --) Depth: 21 00:00:04 9264kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
= (-0.23 --) Depth: 21 00:00:05 11587kN
1.Rc6 Rxb4 2.Rxd6 Rd4 3.Rd8 Kf6 4.Rd6+ Kg5 5.Rd8 Kf5 6.Kh3 Kf6 7.Rd6+ Kg5 8.Kg2 Rd2+ 9.Kh3 Rd3 10.Kg2 Kf4 11.Rd8 Rd2+ 12.Kh3 Kxf3 13.d6 Ke4 14.d7 Rd6 15.Kh4 Kd5 16.Kxh5 e4 17.Kg5 e3 18.Re8 Rxd7 19.Rxe3 Rg7+ 20.Kf6
=/+ (-0.35 --) Depth: 21 00:00:06 14362kN
1.Rh4 Kg5 2.Kg3 Rb5 3.f4+ exf4+ 4.Rxf4 Rxd5 5.Rf3 Rb5 6.Rd3 d5 7.Rd4 Kf5 8.Rh4 Ke6 9.Kf3 Kd6 10.Ke3 Rb7 11.Rxh5 Rxb4 12.Rh7 Re4+ 13.Kd3 Rg4 14.Rh5 Rc4
=/+ (-0.33) Depth: 21 00:00:10 24886kN
Yours would have played it too then.
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."
Top
Dirt
Posts: 2851
Joined: Wed Mar 08, 2006 10:01 pm
Location: Irvine, CA, USA

Re: Test Position: Lemming disease (avoid move)

Post by Dirt »

Carlos Ylich wrote: I still do not know what it is, but reflecting on the facts, I can not agree with you. I believe the family Ippolit programs are not clones...
When did I say anything about clones? Perhaps you meant to reply to someone else.
Top
kingliveson

Re: Test Position: Lemming disease (avoid move)

Post by kingliveson »

Gian-Carlo Pascutto wrote:
De Vos W wrote: One of the clones? Not this one! And i have no proof its a clone, if you have
the proof, let us know Mr. Silver.

Analysis by FireBird 1.1 w32:
The authors webpage says so, what more do you want?
You are making things up. Do you call Stockfish a clone?
Top
Ralph Stoesser
Posts: 408
Joined: Sat Mar 06, 2010 9:28 am

Re: Test Position: Lemming disease (avoid move)

Post by Ralph Stoesser »

I hope next Stockfish version will be a clone eater.
Top

Return to “Computer Chess Club: General Topics”