Author: Ed Schröder
Date: 23:34:40 05/19/99
Go up one level in this thread
>Posted by Francis Monkman on May 19, 1999 at 18:28:49:
>
>This is another excellent example of a 'simple' idea, that
>seems to prove hard for programs to find.
>
>r4rk1/1nqb1pbn/3p2pB/pppP3p/4P3/1PP2NNP/P1BQ2P1/R4RK1 w - -
>
>[Smejkal-Medina, Amsterdam II 1971]
>
>Looking at the position, the idea is, clear the b1-h7 diagonal,
>then piece for piece and the queen to g5 giving check etc.
>
>e5! dxe5 Nxh5 gxh5 Bxh7 Kxh7 Bxg7 Kxg7 Qg5+ (9-ply, and
>surely there's enough 'interest' here to grab an extension?)
>...Kh7 Qxh5+ Kg7 (for obvious but misplaced reasons, programs
>prefer ...Kg8) Ng5 1-0
>
>None of the engines I tried (Fritz, Rebel, Genius, CSTal II) found
>e5 within 5 mins. I left LGG 2.0 looking at it while I took a break,
>and it had found it after 16 mins. (So not to say the others won't.)
Rebel10.5 (setting Deepen King Safety) 3 seconds
|-----|-----|-----|-----|-----|-----|-----|-----| CCC.EPD bm e5
8 | *R | | | | | *R | *K | |
|-----|-----|-----|-----|-----|-----|-----|-----| 00:00:00 00:01:02
7 | | *N | *Q | *B | | *p | *B | *N |
|-----|-----|-----|-----|-----|-----|-----|-----|
6 | | | | *p | | | *p | B | Time infinite
|-----|-----|-----|-----|-----|-----|-----|-----| Hash 60 Mb
5 | *p | *p | *p | p | | | | *p | Engine REBEL10.5
|-----|-----|-----|-----|-----|-----|-----|-----|
4 | | | | | p | | | | anti-GM Off
|-----|-----|-----|-----|-----|-----|-----|-----| System Tiger Off
3 | | p | p | | | N | N | p | Combination Off
|-----|-----|-----|-----|-----|-----|-----|-----| Style Normal
2 | p | | B | Q | | | p | | Strength Strongest
|-----|-----|-----|-----|-----|-----|-----|-----| Search Deepen King S
1 | R | | | | | R | K | |
|-----|-----|-----|-----|-----|-----|-----|-----|
a b c d e f g h
r4rk1/1nqb1pbn/3p2pB/pppP3p/4P3/1PP2NNP/P1BQ2P1/R4RK1 w - -
00:00:00 1.00 0.38 Bh6xg7 Kg8xg7 (0)
00:00:00 2.00 0.75 Bh6xg7 Kg8xg7 Nf3-h4 (0)
00:00:00 3.00 0.36 Bh6xg7 Kg8xg7 Nf3-h4 Kg7-h8 (0)
00:00:00 3.01 0.57 Nf3-h4 Nh7-f6 Bh6xg7 Kg8xg7 Ra1-e1 (0)
00:00:00 4.00 0.57 Nf3-h4 Nh7-f6 Bh6xg7 Kg8xg7 Ra1-e1 (0)
00:00:01 5.00 0.34 Nf3-h4 Ra8-e8 Bh6xg7 Kg8xg7 Ra1-e1 Kg7-h8 (0)
00:00:01 5.01 0.45 Bh6xg7 Kg8xg7 a2-a4 b5xa4 b3xa4 f7-f5 e4xf5 (1)
00:00:01 5.05 0.50 Ra1-e1 Rf8-e8 Bh6xg7 Kg8xg7 Nf3-g5 Nh7-f6 (1)
00:00:02 6.00 0.54 Ra1-e1 Ra8-e8 Bh6xg7 Kg8xg7 Nf3-h4 Nh7-f6 (2)
00:00:02 6.01 0.55 Bh6xg7 Kg8xg7 Ra1-d1 Nh7-f6 Qd2-g5 (2)
00:00:03 6.08 0.55 e4-e5 (3)
00:00:06 6.08 0.98 e4-e5 c5-c4 e5xd6 Nb7xd6 Bh6xg7 Kg8xg7 Nf3-e5 (3)
00:00:27 7.00 1.13 e4-e5 b5-b4 Bh6xg7 Kg8xg7 Ra1-e1 Ra8-e8 e5xd6 (7)
>And another from 1971, Smyslov-Adorjan, Amsterdam I
>
>r1b2k1r/pp2p2p/5pp1/1n1NB3/8/1P4P1/P1P4P/2KR3R w - -
>
>I'm sure I waited hours to see if Genius 3 would get this, when I
>first played through it. Also a simple idea -- White will exchange two
>pieces for a rook and two pawns (already a material advantage) after
>which, a human chess player should see at a glance that his two rooks'
>mobility, and the pressure they can put on Black's king and undeveloped
>queenside mean he can 'mop up' the remaining kingside pawns without too
>much trouble:
>
>Nxf6! exf6 Rd8+ Kg7 Bxf6+ Kxf6 Rxh8 Kg7 Rd8 Nc7 Re1 1-0
>
>Again, none found it within the 5 minutes I allowed (you see I'm getting
>impatient!), except, yes you guessed, LGG 2.0 immediately plays this,
>and for 'all the right reasons'.
Rebel10.5 (setting Deep Threats) 2 seconds
|-----|-----|-----|-----|-----|-----|-----|-----| CCC.EPD bm Nxf6
8 | *R | | *B | | | *K | | *R |
|-----|-----|-----|-----|-----|-----|-----|-----| 00:00:00 00:00:01
7 | *p | *p | | | *p | | | *p |
|-----|-----|-----|-----|-----|-----|-----|-----|
6 | | | | | | *p | *p | | Time infinite
|-----|-----|-----|-----|-----|-----|-----|-----| Hash 60 Mb
5 | | *N | | N | B | | | | Engine REBEL10.5
|-----|-----|-----|-----|-----|-----|-----|-----|
4 | | | | | | | | | anti-GM Off
|-----|-----|-----|-----|-----|-----|-----|-----| System Tiger Off
3 | | p | | | | | p | | Combination Off
|-----|-----|-----|-----|-----|-----|-----|-----| Style Normal
2 | p | | p | | | | | p | Strength Strongest
|-----|-----|-----|-----|-----|-----|-----|-----| Search Deep Threats
1 | | | K | R | | | | R |
|-----|-----|-----|-----|-----|-----|-----|-----|
a b c d e f g h
r1b2k1r/pp2p2p/5pp1/1n1NB3/8/1P4P1/P1P4P/2KR3R w - -
00:00:00 1.00 -1.98 Nd5xf6 e7xf6 Be5xf6 (0)
00:00:00 1.05 0.41 Rh1-f1 (0)
00:00:00 2.00 0.11 Rh1-f1 Bc8-g4 Rd1-d3 (0)
00:00:00 2.08 0.20 a2-a4 Bc8-g4 Rd1-f1 Nb5-a3 c2-c4 (0)
00:00:00 3.00 -0.06 a2-a4 Bc8-g4 Rd1-d2 Bg4-f3 Rh1-f1 Bf3xd5 Rd2xd5 (0)
00:00:01 4.00 0.11 a2-a4 f6xe5 Rh1-f1+ Kf8-g7 a4xb5 Bc8-g4 Rd1-d3 (0)
00:00:01 5.00 -0.10 a2-a4 f6xe5 a4xb5 Bc8-f5 Rh1-e1 e7-e6 Nd5-b4 (1)
00:00:02 5.05 0.00 Nd5xf6 e7xf6 Rd1-d8+ Kf8-g7 Be5xf6+ Kg7xf6 Rd8xh8 (2)
00:00:03 6.00 0.11 Nd5xf6 e7xf6 Rd1-d8+ Kf8-g7 Be5xf6+ Kg7xf6 Rd8xh8 (2)
00:00:08 7.00 0.20 Nd5xf6 e7xf6 Rd1-d8+ Kf8-f7 Rd8xh8 f6xe5 Rh8xh7+ (4)
Ed Schroder
>I'm not trying to plug LGG too hard, really. I've watched it do some
>pretty terrible things too! But for some of these 'difficult' moves, it
>really does seem to have a consistent edge over the rest.
>
>Francis
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