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Stockfish, you ain't no Alekhine

https://open-chess.org/viewtopic.php?f=3&t=2243

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Stockfish, you ain't no Alekhine

Posted: Sat Jan 26, 2013 11:34 am
by Jeremy Bernstein
r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 14

Why is Stockfish so resistant to finding Qe2 in this position? Only at around depth 27 does it find the move. Deep Fritz has a similar problem. Critter finds it nearly instantly, Komodo takes a few seconds. What does your engine think?

(Alekhine - Levenfish, St. Petersburg 1912)

jb

Re: Stockfish, you ain't no Alekhine

Posted: Sat Jan 26, 2013 1:03 pm
by Sean Evans
Deep Rybka 4 found the move instantly!

New game
r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 1

Analysis by Deep Rybka 4 x64:

1. +/= (0.63): 14.Qe2 Bg7 15.0-0-0 0-0 16.Bd6 Re8 17.Bg3 Nh5 18.Rd7 Kh8 19.Bc7 Qa7 20.Rhd1 b5 21.Ba5 Bxd7 22.exd7 bxc4 23.dxe8Q+ Rxe8 24.Qxc4 Rf8 25.Kb1 Rxf3 26.Rd8+ Rf8 27.Rxf8+ Bxf8 28.Ne4 Qb7 29.a3
2. = (-0.24): 14.0-0 Bxe6 15.Bxe6 Qxe6 16.Re1 Qf5 17.Bg3 Rd8 18.Qe2 Kf7 19.Qf2 Qc8 20.Ne4 Bh6 21.Qe2 Nxe4 22.Qxe4 Rhe8 23.Qh4 Bg7 24.Qxh7 Qf5 25.Be5

(Doe, 26.01.2013)

Re: Stockfish, you ain't no Alekhine

Posted: Sat Jan 26, 2013 6:15 pm
by zullil
Less than a second for Spark with 8 threads:

Code: Select all

spark-1.0
(c) 2009-2010 AJ Siemelink

inifile=spark.ini

book=spark.bbk, 4651 moves
book.file=spark.bbk
allocating hash...allocated 32Mb
starting threads...started 16 threads

initialized
% setoption name Threads value 8
setting cpus=8
% setoption name Hash value 2048
resizing hash to 2048Mb
% position fen r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 14 

   +---+---+---+---+---+---+---+---+
 8 |*r*|   |*b*|   |*k*|*b*|   |*r*|
   +---+---+---+---+---+---+---+---+
 7 |   |*p*|   |   |*p*|   |   |*p*|
   +---+---+---+---+---+---+---+---+
 6 |*p*|*q*|   |   |(P)|*n*|*p*|   |
   +---+---+---+---+---+---+---+---+
 5 |   |   |*p*|   |   |   |   |   |
   +---+---+---+---+---+---+---+---+
 4 |   |   |(B)|   |   |(B)|   |   |
   +---+---+---+---+---+---+---+---+
 3 |   |   |(N)|   |   |(P)|   |   |
   +---+---+---+---+---+---+---+---+
 2 |(P)|(P)|(P)|   |   |   |   |(P)|
   +---+---+---+---+---+---+---+---+
 1 |(R)|   |   |(Q)|(K)|   |   |(R)|  35-35=0 
   +---+---+---+---+---+---+---+---+
     a   b   c   d   e   f   g   h

r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 1
 hash=1d11a3e9494237a8
phash=0cc24dba37fc9f2f
% go infinite
Nominal search time is 5.00 seconds, infinite=1, nodes=0
%   [1/0]     0.000       8      -11  O-O Bxe6 
  [1/0]     0.000      11      -10  ++2/48 a2a4
  [1/0]     0.001      27      -10  a4 Bxe6 
  [1/0]     0.001      94        5  ++10/48 Nc3d5
  [1/0]     0.001     142        5  Nd5 Qxe6+ Kf2 Nxd5 Bxd5 
  [1/0]     0.001     144       31  ++11/48 Qd1e2
  [1/0]     0.001     146       31  Qe2 Qxb2 
  [1/0]     0.001     269       31  ok/269.0 
  [2/1]     0.001     291       31  Qe2 Qxb2 
  [2/2]     0.001     472       31  ok/1.8 
  [3/2]     0.002     543      -32  Qe2 Qxb2 Kd2 
  [3/3]     0.002     567      -31  ++2/48 Nc3d5
  [3/3]     0.002     619        5  Nd5 Qxe6+ Kf2 Nxd5 Bxd5 
  [3/4]     0.002     797        6  ++18/48 Qd1d3
  [3/4]     0.002     813       34  Qd3 Bxe6 O-O-O Bxc4 Qxc4 
  [3/4]     0.003     984       34  ok/2.1 
  [4/4]     0.003    1015        9  --Qd1d3
  [4/6]     0.005    1669       -7  Qd3 Bxe6 O-O-O Kf7 
  [4/6]     0.005    1786       -6  ++2/48 Nc3d5
  [4/6]     0.005    1837        5  Nd5 Qxe6+ Kf2 Nxd5 Bxd5 
  [4/6]     0.006    2159        5  ok/2.2 
  [5/6]     0.006    2407      -19  Nd5 Qxe6+ Kf2 Nxd5 Bxd5 Qf6 
  [5/6]     0.006    2483      -18  ++2/48 Qd1d3
  [5/6]     0.007    2626       28  Qd3 Bxe6 O-O-O Kf7 Rhe1 
  [5/6]     0.007    3011       29  ++6/48 Ke1f2
  [5/6]     0.007    3042       30  Kf2 Nh5 
  [5/6]     0.008    3209       41  Kf2 Bxe6 Na4 Qc6 Bxe6 Qxe6 Nxc5 
  [5/6]     0.008    3393       42  ++8/48 O-O
  [5/6]     0.008    3490       54  O-O Bg7 Re1 O-O Qc1 
  [5/7]     0.010    4565       54  ok/2.1 
  [6/8]     0.011    4702       29  --O-O
  [6/12]    0.015    7786        4  --O-O
  [6/12]    0.016    8600        5  ++4/48 Qd1d3
  [6/12]    0.017    8718       18  Qd3 Bxe6 O-O-O Bxc4 Qxc4 Bg7 
  [6/12]    0.019   10587       18  ok/2.3 
  [7/12]    0.020   11078       11  Qd3 Bxe6 O-O-O Bxc4 Qxc4 Bg7 h4 
  [7/13]    0.028   18026       11  ok/1.7 
  [8/13]    0.028   18561      -14  --Qd1d3
  [8/13]    0.039   29920      -13  ++22/48 O-O
  [8/13]    0.041   31605       13  O-O Bg7 Rb1 Bxe6 Na4 Qa5 Bxe6 Qxa4 
  [8/13]    0.044   34222       13  ok/1.9 
  [9/13]    0.051   43188        5  O-O Bg7 Bc1 Bxe6 Na4 Qc6 Bxe6 Qxa4 Be3 
  [9/15]    0.075   73863        5  ok/2.2 
 [10/15]    0.083   83127        1  O-O Bg7 Bc1 Bxe6 Na4 Qc6 Bxe6 Qxa4 Re1 Qd4+ Qxd4 cxd4 
 [10/17]    0.127     137k       1  ok/1.9 
 [11/17]    0.192     232k       7  O-O Bg7 Qd2 O-O Rfd1 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qh3 
 [11/22]    0.266     334k       7  ok/2.4 
 [12/22]    0.316     400k       9  O-O Bg7 Qe2 O-O Bc1 Rd8 a4 Qc7 Bg5 b6 Rfd1 Bb7 Rxd8+ Rxd8 Bxa6 
 [12/28]    0.452     613k       9  ok/1.8 
 [13/28]    0.487     669k       4  O-O Bg7 Qe2 O-O Bc1 Qa5 Bd2 b5 Nxb5 Qb6 Nc3 Qxb2 Na4 Qxc2 Nxc5 
 [13/30]    0.909    1372k       5  ++28/48 Qd1e2
 [13/30]    0.958    1441k      34  Qe2 Qxb2 
 [13/30]    1.044    1557k      59  Qe2 Qxb2 
 [13/30]    1.305    1979k      48  Qe2 Bg7 O-O-O O-O Bd6 Re8 Bg3 Nh5 Qe4 Bxc3 bxc3 Rd8 Rxd8+ Qxd8 
 [13/30]    1.326    2020k      48  ok/3.3 
 [14/30]    1.408    2153k      53  Qe2 Bg7 O-O-O O-O Bd6 Re8 Bg3 Nh5 Qe4 Bd4 Rd3 Nf6 Qe1 Rd8 
 [14/33]    1.624    2619k      53  ok/1.3 
 [15/33]    1.748    2833k      58  Qe2 Bg7 O-O-O O-O Bd6 Re8 Bg3 Nh5 Qe4 Bd4 Be5 Nf6 Qe2 Rd8 h4 
 [15/37]    2.103    3666k      58  ok/1.4 
 [16/37]    2.444    4229k      55  Qe2 Bg7 O-O-O O-O Bd6 Re8 Bg3 Qc6 Rd7 b5 Rc7 Qb6 Nd5 Nxd5 Bxd5 Ra7 
 [16/37]    3.154    5998k      55  ok/1.6 
 [17/37]    4.393    7980k      69  Qe2 Bg7 O-O-O O-O Bg5 Qa5 Nd5 Nxd5 Bxd5 Re8 Kb1 Qb6 Bb3 a5 a4 Ra6 Rhe1 Qc7 
 [17/37]    5.564   10708k      69  timeout/1.8 (INF)

Re: Stockfish, you ain't no Alekhine

Posted: Sat Jan 26, 2013 11:18 pm
by peter64
Houdini 3 pro x64 finds it instantly, and after a couple of minutes gives around +0.8 for white.

Lately I have been playing around with Houdini testing it in old historical games and it is really amazing when you realize the strength of this engine.

Re: Stockfish, you ain't no Alekhine

Posted: Mon Jan 28, 2013 4:29 pm
by User923005
Stockfish very aggressively prunes away moves that look bad. At first glance, you are tossing away the b pawn. Stockfish is very, very good at the careful, solid moves. For that reason, Stockfish tends to be really outstanding at analysis of openings. Think Mikhail Botvinnik, not Mikhail Tal.
Given 40/2hrs time control, where all decent chess is played, Stockfish finds it with three threads on a 3GHz I7:
  • Analysis of Q:\alekhine.epd
    1/28/2013 7:15:31 AM Level: 600 Seconds
    Analyzing engine: Stockfish-231-gcc-modern

    1 -
    Avoid move:
    Best move (Stockfish-231-gcc-modern): Qd1-e2
    Not found in: 10:00
    2/3 00:00 578 289,000 +0.64 Nd5 Qxe6+ Ne3
    3/4 00:00 1,774 887,000 +0.76 Nd5 Nxd5 Qxd5 Qxb2
    4/6 00:00 2,770 923,333 +0.52 Nd5 Qxe6+ Ne3 Qd7 Kf2 Qxd1 Rhxd1
    5/8 00:00 7,832 1,118,857 +0.44 Nd5 Qxe6+ Kf2 Nxd5 Qxd5 Qxd5 Bxd5
    6/8 00:00 10,383 1,038,300 +0.44 Nd5 Qxe6+ Kf2 Nxd5 Qxd5 Qxd5 Bxd5
    7/11 00:00 32,366 1,541,238 +0.28 Qd3 Bg7 0-0-0 0-0 Be3 Qc6 Rhe1 b5 Bb3
    8/14 00:00 54,296 1,751,483 +0.16 Qd3 Bxe6 0-0-0 Bxc4 Qxc4 Qb4 Qxb4 cxb4 Nd5 Nxd5 Rxd5
    9/18 00:00 140,690 2,233,174 -0.20 0-0 Bg7 b3 0-0 Re1 Qa5 Bd2 Nh5 Ne4 Qc7 c3
    10/18 00:00 196,204 2,335,761 -0.04 0-0 Bg7 b3 0-0 Qd2 Qc6 Rae1 b5 Nd5 Ra7 Nxf6+ Bxf6 Bd5 Bd4+ Qxd4 cxd4 Bxc6 Rxf4
    11/20 00:00 657,515 2,988,704 -0.16 0-0 Bg7 Qd3 0-0 Rfd1 Kh8 Be3 Ne8 Rab1 Bxe6 Na4 Qc6 Bxe6 Qxe6 Nxc5 Qxa2
    12/20 00:00 831,349 3,056,430 -0.16 0-0 Bg7 Qd3 0-0 Rfd1 Kh8 Be3 Ne8 Rab1 Bxe6 Na4 Qc6 Bxe6 Qxe6 Nxc5 Qxa2
    13/25 00:00 2,685,892 3,510,969 0.00 0-0 Bg7 Re1 0-0 Be5 Rd8 Qe2 Qa5 Red1 b5 Bd5 Ra7 Bb8 Nxd5 Bxa7 Bxc3 bxc3 Qxc3
    14/25 00:01 3,787,625 3,529,939 -0.16 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 b6 Nxa6 Rac8 c3 Nd5 Bxg7 Kxg7 Qe5+ Kg8
    15/27 00:01 4,323,635 3,535,269 -0.04 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rf7 Qc4 Nd5 Bxg7 Kxg7 Rae1 Rf5 Ne6+ Kg8 Qxc6 bxc6
    16/27 00:01 5,779,100 3,576,175 -0.16 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rf7 Rfe1 a5 c3 axb4 cxb4 Nd5 Bxg7 Kxg7
    17/34- 00:03 11,842,181 3,584,195 -0.32 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qc4+ Kh8 Be3 Rac8 Na4 Qc6 Qxc5 Qxf3 Qxe7 Nh5
    17/34+ 00:03 13,785,114 3,593,616 +0.04 0-0 Bg7 Qe2 0-0 Rab1 Nh5 Nd5 Nxf4 Nxb6 Nxe2+ Bxe2 Bxe6 Nxa8 Rxa8 b3 b5 Kg2
    17/34 00:04 15,338,721 3,594,731 -0.28 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qd2 b6 Nd3 a5 Rfe1 axb4 Qxb4
    18/34+ 00:04 16,164,146 3,596,028 -0.20 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qe1 b6 Ne6 Rxc2 Nc7
    18/34+ 00:04 16,325,315 3,594,300 -0.12 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qe1 b6 Ne6 Rxc2 Nc7
    18/34+ 00:04 16,732,220 3,593,689 0.00 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qe1 b6 Ne6 Rxc2 Nc7
    18/34- 00:05 18,672,970 3,595,796 -0.36 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qe1 a5 Bd4 b6 Qxe7 Re8
    18/34 00:05 20,057,117 3,600,272 -0.20 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 b4 Rfc8 Rad1 Qb5 Qe1 a5 Bd4 b6 Qxe7 Re8 c4 Rxe7 cxb5 axb4
    19/34+ 00:06 22,138,795 3,613,317 -0.12 0-0 Bg7 Qe2 0-0 Rab1 Qa5 Bd2 Qc7 a4 Nh5 Nd5 Qd6 Bg5 Bd4+ Kh1 Re8 c3 Bg7 Rfd1
    19/34+ 00:06 22,647,894 3,612,680 -0.04 0-0 Bg7 Qe2 Qxb2 Be5 Qb4 Rfb1
    19/34 00:07 25,849,991 3,616,900 +0.04 0-0 Bg7 Qe2 0-0 Rab1 Nh5 Nd5 Nxf4 Nxb6 Nxe2+ Bxe2 Bxe6 Nxa8 Rxa8 b3 Bf5 Bc4+ Kf8 Bd3 Bxd3 cxd3 Rd8 Rfd1 Kf7 Kf2 Bd4+ Ke2
    20/34- 00:08 30,065,673 3,633,753 -0.04 0-0 Bg7 Qe2 0-0 Rab1 Qa5 Bd2 Qc7 a4 b6 Rbd1 Bb7 Be3 Bc6 Bxa6 Nh5 Nd5 Bxd5 Rxd5 Nf4 Bxf4 Qxf4 Rd7 Bxb2
    20/36- 00:09 34,878,109 3,638,062 -0.12 0-0 Bxe6 Bxe6 Qxe6 Re1 Qf5 Bc7 Bg7 Bd6 0-0-0 Rxe7 Ne8
    20/36- 00:10 38,551,227 3,655,184 -0.24 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Nd7 Re2 Qc8 Qd5 Qxa8 Rd1 Qc8
    20/36 00:10 39,249,135 3,651,421 -0.20 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Nd7 Qe2 Bh6 Rdd1 Kf7 Qc4+ e6 Qe4 Qxe4 fxe4 Ke7
    21/36- 00:13 48,313,286 3,658,711 -0.28 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Nd7 Qe2 Bh6 Rdd1 Kf7 Qc4+ e6 Qe4 Qxe4 fxe4 Ke7
    21/36+ 00:14 52,397,974 3,648,883 -0.12 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Nd7 c3 Bh6 Rd5 Rf8 Qe2 c4 Re1
    21/36 00:17 61,929,148 3,660,115 -0.08 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rf7 Qd6 Qxd6 Bxd6 Nd7 Rhf1 c4 bxc4 Bxc3 bxc3 Re8 Rfe1 Rxe1 Rxe1 Rxf3 Re8+ Kg7 Re7+ Rf7
    22/36- 00:20 73,569,392 3,683,073 -0.16 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rf7 Qd6 Qxd6 Bxd6 Nd7 Rhf1 c4 bxc4 Bxc3 bxc3 Re8 Rfe1 Rxe1 Rxe1 Rxf3 Re8+ Kg7 Re7+ Rf7
    22/36 00:21 77,411,818 3,682,068 -0.08 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rf7 Qd6 Qxd6 Bxd6 Nd7 Rhf1 c4 bxc4 Bxc3 bxc3 Re8 Rfe1 Rxe1 Rxe1 Rxf3 Re8+ Kg7 Re7+ Rf7
    23/36- 00:22 83,117,534 3,684,941 -0.16 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rf7 Qd6 Qxd6 Bxd6 Nd7 Rhf1 c4 bxc4 Bxc3 bxc3 Re8 Rfe1 Rxe1 Rxe1 Rxf3 Re8+ Kg7 Re7+ Rf7
    23/36- 00:25 93,005,705 3,688,653 -0.24 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rf7 Qd6 Nd7 Rhe1 Qxd6 Rxd6 Rxf4 Rxd7 Rxf3 Rxb7 Bxc3 bxc3 Rxc3 Rbe7 Rd8
    23/36 00:27 99,847,883 3,692,053 -0.08 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rfe8 Qd6 Qa5 Na4 c4 Bd2 Qb5 Nc3 Qd7 Qb4 cxb3 Qxb3+ Qf7 Qxf7+ Kxf7 Rhe1 Rxe1 Rxe1 Re8 Rxe8 Nxe8 Ne4
    24/39- 00:30 112,922,540 3,697,044 -0.16 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rfe8 Qd6 Qa5 Na4 c4 Bd2 Qf5 bxc4 Rac8 Rhe1 Rxc4 Nc3 Rcc8 Re7 Bf8 Rxe8 Rxe8 Qf4 Qxf4 Bxf4 Bc5 Bd6 Be3+ Kb1 Rd8
    24/39- 00:32 120,200,975 3,699,971 -0.24 Bb3 Bxe6 Qe2 Bxb3 axb3 Bg7 0-0-0 0-0 Qxe7 Rfe8 Qd6 Qa5 Na4 c4 Bd2 Qf5 bxc4 Rac8 Rhe1 Rxc4 Nc3 Rcc8 Re7 Rxe7 Qxe7 Nd5
    24/39- 00:42 158,008,462 3,739,756 -0.36 Bb3 Bxe6 Qe2 Bxb3 axb3 Rd8 0-0 Bg7 Rfe1 0-0 Qxe7 Nd5 Nxd5 Rxd5 Re6 Qd8 Qxd8 Rdxd8
    24/44 00:45 168,573,949 3,740,020 -0.28 Bb3 Bxe6 Qe2 Bxb3 axb3 Rd8 0-0 Bg7 Rfd1 0-0 Qxe7 Rxd1+ Rxd1 Qc6 Bg3 c4 bxc4 Qb6+ c5 Qxb2 Qe6+ Kh8 Be5 Qxc2 Qe7 Qf5 f4 Qg4+ Kh1 Qf3+ Kg1 a5 Rd8 Qg4+ Kf1 Qf3+ Kg1 Qg4+ Kf1 Qf3+ Kg1
    25/44- 00:51 193,421,705 3,757,658 -0.36 Bb3 Bxe6 Qe2 Bxb3 axb3 Rd8 0-0 Bg7 Rfd1 0-0 Qxe7 Rxd1+ Rxd1 Qc6 Bg3 Qxf3 Qe6+ Rf7 Rf1 Qc6 Qxc6 bxc6 Ra1 Ng4 Rxa6 Bd4+ Kh1 Ne3
    25/47+ 01:09 262,491,349 3,794,927 -0.20 Be5 Bxe6 Qe2 Rd8 0-0 Bxc4 Qxc4 Bh6 Ne4 Be3+ Kh1 Bd4 Bxf6 Bxf6 Rae1 Bxb2 c3 Rf8 Re2 Rf5 Rb1
    25/47 01:19 302,749,724 3,819,462 -0.28 Be5 Bxe6 Qe2 Bxc4 Qxc4 Bh6 Rd1 Rf8 0-0 Rd8 Rxd8+ Kxd8 Bxf6 Qxf6 Qxc5 Qg5+ Qxg5 Bxg5 Kg2 Kc7 Rd1 Kc6 Ne4 Bf4 c4 b6 h3 h6 a3 Be5 b4 Bd6 h4
    26/47 01:23 318,888,612 3,823,742 -0.28 Be5 Bxe6 Qe2 Bxc4 Qxc4 Bh6 Rd1 Rf8 0-0 Rd8 Rxd8+ Kxd8 Bxf6 Qxf6 Qxc5 Qg5+ Qxg5 Bxg5 Kg2 Kc7 Rd1 Kc6 Ne4 Bf4 c4 b6 h3 h6 a3 Be5 b4 Bd6 h4
    27/47+ 01:30 344,581,528 3,833,113 -0.20 Be5 Bxe6 Qe2 Bxc4 Qxc4 Qxb2 0-0 Qxc2 Bxf6 exf6 Rfe1+ Kd8 Qf7
    27/47+ 01:35 366,985,543 3,842,136 -0.12 Be5 Bxe6 Qe2 Rd8 0-0 Bxc4 Qxc4 Bh6 Ne4 Be3+ Kh1 Bd4 Bxf6 Bxf6 c3 h6 Rae1
    27/47+ 02:05 482,033,162 3,861,083 0.00 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Bg7 Rd8+ Kf7 Rxh8 Bxh8 Qd8 Ne8 c3 Qxf3 Rf1
    27/47 02:07 492,275,384 3,859,954 0.00 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 Bg7 Rd8+ Kf7 Rxh8 Bxh8 Qd8 Qxf3 Qxh8 Qe3+ Kg2 Qe4+ Kg3 Qe5+ Kf3 Qe4+ Kg3 Qe5+ Kf3 Qe4+ Kg3
    28/47- 02:22 552,101,106 3,869,641 -0.08 0-0 Bxe6 Na4 Qb4 Bxe6 Qxf4 Nb6 Qe3+ Rf2 Qxe6 Nxa8 Qc6 Rd2 c4 h3 Qc8
    28/47- 02:31 586,999,201 3,873,994 -0.16 0-0 Bxe6 Bxe6 Qxe6 Re1 Qf5 Qd6 Rd8 Qc7 Rd7 Qb8+ Kf7 Re5 Qxc2 Re2 Qf5 Re5 Bg7 Rxf5 Rxb8 Rxf6+ Bxf6 Bxb8 Rd2 Rb1 Bd4+ Kh1
    28/47+ 02:50 658,078,652 3,868,706 +0.08 Qe2 Qxb2 Nb5 Qxa1+ Kf2 Qxh1 Nc7+ Kd8 Qd3+ Nd7 exd7 Bxd7 Be6
    28/47+ 03:01 697,954,645 3,857,019 +0.53 Qe2 Qxb2 Nb5 Qxa1+ Kf2 Qxh1 Nc7+ Kd8 Qd3+ Nd7 exd7 Bxd7 Be6
    28/66+ 05:24 1,244,926,764 3,841,026 +0.94 Qe2 Bg7 0-0-0 0-0 Bg5 Kh8 h4 h6 h5 hxg5 h6 Rd8 Rxd8+
    28/66 07:15 1,665,606,635 3,829,914 +0.88 Qe2 Bg7 0-0-0 0-0 Bg5 Qc7 Kb1 b5 Bxf6 Bxf6 Nd5 Qb8 Nxf6+ Rxf6 Rd8+ Rf8 Rxf8+ Kxf8 Bd5 Bb7 Qe4 Bxd5 Qxd5 c4 Rd1 Kg8 h3 Qc8 f4
    29/66+ 07:35 1,743,692,637 3,831,087 +0.96 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qc6 Rhe1
    29/66+ 07:44 1,780,314,969 3,831,427 +1.05 Qe2 g5 Be5 Bxe6 0-0-0
    29/66+ 07:52 1,809,643,225 3,831,278 +1.17 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qb4 a3 Qb6 Rd7 Qc6 Rc7 Qb6 Kb1 Nh5 Be5 Nf4 Qe3 Bxe5 Qxe5 Nxe6 Nd5
    29/66+ 08:12 1,884,802,002 3,832,019 +1.35 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Ra7 Rd7 Kf8 Rhd1 Bxd7 exd7 Rd8 Na4 Bh6+ Kb1 Qc6 Nxc5 Qxc5 Qe6
    29/66 08:52 2,041,508,178 3,837,587 +1.49 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Rxe8 Qxc4+ Kh8 Qe6 c4 Qxc4 Rf8 Rd1 Nh5 Bc7 Qg5+ Kb1 Qe3 Rd3 Qe1+ Nd1 Rxf3 Qxa6 Rf8 Qa5 Qe2 Ne3
    30/66- 08:56 2,057,994,293 3,837,658 +1.41 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Rxe8 Qxc4+ Kh8 Qe6 c4 Qxc4 Nh5 Bc7 Qg5+ f4 Qh4 Kb1 Rf8 Nd5 e6
    30/66- 08:59 2,069,578,402 3,837,840 +1.33 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Rxe8 Qxc4+ Kh8 Qe6 c4 Qxc4 Nh5 Bc7 Qg5+ f4 Qh4 Kb1 Rf8 Nd5 e6
    30/66 09:13 2,122,897,623 3,838,444 +1.49 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Nxe8 Qxc4+ Kf8 Ne4 Qb5 Qxb5 axb5 Nxc5 b4 a4 Kf7 Re1 Nd6 b3 Bh6+ f4 Bg7 Ne6 Bf6 Ng5+ Bxg5 fxg5 Nf5 Bc7 Rc8
    31/66- 09:24 2,166,284,697 3,841,379 +1.41 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Nxe8 Qxc4+ Kf8 Ne4 Qb5 Qxb5 axb5 Nxc5 Kf7 Rd1 Nf6 Bf4 Nh5 Be3 Be5 Ne4 Nf6 Nxf6 Kxf6 f4 Bd6
    31/66- 09:30 2,190,780,502 3,842,692 +1.33 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 dxe8Q+ Nxe8 Qxc4+ Kf8 Ne4 Qb5 Qxb5 axb5 Nxc5 Kf7 Rd1 Nf6 Bf4 Nh5 Be3 Be5 Ne4 Nf6 Nxf6 Kxf6 f4 Bd6
    31/66 09:48 2,262,615,233 3,843,422 +1.41 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Rd7 b5 a3 Bxd7 exd7+ bxc4 Qxc4+ Kf8 dxe8Q+ Nxe8 Ne4 Qb5 Qxb5 axb5 Nxc5 Kf7 Rd1 Nf6 Kb1 Rc8 Bf2 Bh6 Nd3 e6 c3 Nd5 Kc2 Bg7 Re1
    1/28/2013 7:25:34 AM, Time for this analysis: 00:10:00, Rated time: 10:00

    0 of 1 matching moves
    1/28/2013 7:25:35 AM, Total time: 12:10:03 AM
    Rated time: 10:00 = 600 Seconds

Re: Stockfish, you ain't no Alekhine

Posted: Mon Jan 28, 2013 4:56 pm
by User923005
Gaviota did very well on this one:
Analysis of Q:\alekhine.epd
1/28/2013 7:40:50 AM Level: 600 Seconds
Analyzing engine: Gaviota64sse2-learn

1 -
Avoid move:
Best move (Gaviota64sse2-learn): Qd1-e2
Not found in: 10:00
2 00:00 1,004 0 +0.29 Be5 Bxe6
3 00:00 1,992 0 +0.18 h4 Bxe6 Bxe6 Qxe6+ Qe2
4 00:00 5,919 369,937 +0.64 0-0 Qxb2 Na4 Qb4
5 00:00 10,899 681,187 +0.90 0-0 Bg7 Na4 Qc6 b3
:-(
6 00:00 32,577 525,435 +0.33 0-0 Bg7 Na4 Qc6 b3 0-0
7 00:00 60,333 641,840 +0.36 0-0 Bxe6 Bxe6 c4+ Kg2 Qxe6 Re1
8 00:00 81,770 654,160 +0.17 0-0 Bg7 Rb1 0-0 Qe1 Rd8 Rd1 Rxd1 Nxd1
8 00:00 122,658 786,269 +0.17 0-0 Bg7 Rb1 0-0 Qe1 Rd8 Rd1 Rxd1 Nxd1
9 00:00 145,912 780,278 +0.07 0-0 Bg7 Rb1 0-0 Qe1 Rd8 Rd1 Rxd1 Nxd1 Nh5
9 00:00 217,961 871,844 +0.07 0-0 Bg7 Rb1 0-0 Qe1 Rd8 Rd1 Rxd1 Nxd1 Nh5
10 00:00 275,717 883,708 0.00 0-0 Bg7 Rb1 Bxe6 Bxe6 c4+ Kg2 Qxe6 Re1 Qf5
10 00:00 379,754 1,012,677 +0.12 Bb3 Bxe6 Qe2 Bxb3 axb3 0-0-0 0-0 Nd5 Nxd5 Rxd5 Rfd1
10 00:00 431,350 1,062,438 +0.12 Bb3 Bxe6 Qe2 Bxb3 axb3 0-0-0 0-0 Nd5 Nxd5 Rxd5 Rfd1
11 00:00 534,971 1,105,311 +0.09 Bb3 Bxe6 Qe2 Bxb3 axb3 0-0-0 0-0 Nd5 Be5 Nxc3 bxc3 c4+ Kh1
11 00:00 776,790 1,275,517 +0.09 Bb3 Bxe6 Qe2 Bxb3 axb3 0-0-0 0-0 Nd5 Be5 Nxc3 bxc3 c4+ Kh1
12 00:00 1,021,003 1,258,943 +0.14 Bb3 Bg7 Qe2 0-0 Rd1 Qc6 Be3 c4 Bxc4 Bxe6 Bxe6+ Qxe6 0-0
12 00:01 1,365,976 1,389,599 +0.14 Bb3 Bg7 Qe2 0-0 Rd1 Qc6 Be3 c4 Bxc4 Bxe6 Bxe6+ Qxe6 0-0
13 00:01 1,845,095 1,328,362 -0.13 Bb3 Bg7 Qe2 0-0 Rd1 Qc6 Be3 c4 Bxc4 b5 Bb3 Bxe6 0-0
13 00:02 2,975,450 1,297,623 +0.01 0-0 Bg7 Qd3 Nh5 Nd5 Nxf4 Nxb6 Nxd3 Nxa8 Bd4+ Kg2 Nf4+ Kg3 Nh5+ Kg4 Bxb2 Nc7+ Kd8
13 00:02 3,939,747 1,443,130 +0.01 0-0 Bg7 Qd3 Nh5 Nd5 Nxf4 Nxb6 Nxd3 Nxa8 Bd4+ Kg2 Nf4+ Kg3 Nh5+ Kg4 Bxb2 Nc7+ Kd8
14 00:03 4,944,868 1,480,942 0.00 0-0 Bg7 Qd3 0-0 Rad1 Kh8 Qe3 Qxb2 Bb3 b5 Qxc5 Nh5 Be5 Bxe5 Qxe5+ Kg8
14 00:04 6,528,584 1,641,172 0.00 0-0 Bg7 Qd3 0-0 Rad1 Kh8 Qe3 Qxb2 Bb3 b5 Qxc5 Nh5 Be5 Bxe5 Qxe5+ Kg8
15 00:04 7,138,225 1,657,739 0.00 0-0 Bg7 Qd3 0-0 Rad1 Kh8 Qe3 Qxb2 Bb3 b5 Qxc5 Nh5 Be5 Bxe5 Qxe5+ Kg8
15 00:05 9,716,024 1,799,930 0.00 0-0 Bg7 Qd3 0-0 Rad1 Kh8 Qe3 Qxb2 Bb3 b5 Qxc5 Nh5 Be5 Bxe5 Qxe5+ Kg8
16 00:07 13,786,895 1,818,371 +0.08 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 Qc4+ Nd5 Bxg7 Kxg7 Rad1 Rad8
16 00:10 19,783,829 1,898,457 +0.08 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 Qc4+ Nd5 Bxg7 Kxg7 Rad1 Rad8
17 00:11 21,910,824 1,913,441 +0.11 0-0 Bg7 Qe2 0-0 Be5 Bxe6 Na4 Qc6 Bxe6+ Qxe6 Nxc5 Qc6 Qc4+ Nd5 Bxg7 Kxg7 Rad1 Rad8 f4
17+ 00:21 45,821,771 2,108,590 +0.47 Qe2
:-)
17 00:25 52,685,960 2,082,202 +0.76 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ Kh8 Kb1 Rad8 Qc3 b6
17 00:25 53,185,982 2,082,702 +0.76 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ Kh8 Kb1 Rad8 Qc3 b6
18 00:27 57,486,929 2,091,422 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ Kh8 Kb1 Rad8 Rxd8 Rxd8 Rf1 b5
18 00:28 59,676,597 2,101,880 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ Kh8 Kb1 Rad8 Rxd8 Rxd8 Rf1 b5
19 00:33 70,414,137 2,090,618 +0.73 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe5 Qxe5 Qb4 Nd5 Qxc4 Nxe7+ Kf8 Qh8+ Kxe7 Qxh7+ Kxe6 Rhe1+ Kf5 Rxe8 Qxa2
19 00:35 73,307,976 2,102,563 +0.73 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe5 Qxe5 Qb4 Nd5 Qxc4 Nxe7+ Kf8 Qh8+ Kxe7 Qxh7+ Kxe6 Rhe1+ Kf5 Rxe8 Qxa2
20 00:44 93,120,622 2,115,993 +0.72 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Rad8 Kb1
20 00:48 102,696,895 2,138,048 +0.72 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Rad8 Kb1
21 01:01 131,056,932 2,145,871 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Red8 Rhe1 Rd5 Rxd5 Qxd5
21 01:15 164,611,816 2,197,402 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Red8 Rhe1 Rd5 Rxd5 Qxd5
22 01:47 238,633,507 2,215,025 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Red8 Rhe1 Rd5 Rxd5 Qxd5
22 02:01 270,802,918 2,235,269 +0.62 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Be5 Bxe6 Na4 Qc6 Nxc5 Bxc4 Qxc4+ e6 Bxg7 Nxg7 Qc3 Red8 Rhe1 Rd5 Rxd5 Qxd5
23 05:16 742,934,186 2,349,347 +0.86 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Rd7 Bxc3 bxc3 Ng7 Rhd1 Qa5 Kb2 Qb6+ Bb3 Nf5 Bc7 Qc6 Be5 Qb5 c4 Qb6
23 05:32 781,791,939 2,351,911 +0.86 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Nh5 Rd7 Bxc3 bxc3 Ng7 Rhd1 Qa5 Kb2 Qb6+ Bb3 Nf5 Bc7 Qc6 Be5 Qb5 c4 Qb6
24 09:33 1,372,662,015 2,395,278 +0.73 Qe2 Bg7 0-0-0 0-0 Bd6 Re8 Bg3 Qa5 Bb3 b5 Nd5 Ra7 Kb1 Nxd5 Bxd5 Rd8 Qe4 Qb4 Qxb4 cxb4 Bb8 Bb7 Bxa7 Bxd5
1/28/2013 7:50:53 AM, Time for this analysis: 00:10:00, Rated time: 10:00

0 of 1 matching moves
1/28/2013 7:50:54 AM, Total time: 12:10:03 AM
Rated time: 10:00 = 600 Seconds

Re: Stockfish, you ain't no Alekhine

Posted: Wed Mar 13, 2013 3:30 pm
by Master Om
Jeremy Bernstein wrote:r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 14

Why is Stockfish so resistant to finding Qe2 in this position? Only at around depth 27 does it find the move. Deep Fritz has a similar problem. Critter finds it nearly instantly, Komodo takes a few seconds. What does your engine think?

(Alekhine - Levenfish, St. Petersburg 1912)

jb

Just 2 mins

New game
r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 1
Analysis by Stockfish 12-03-13 64bit SSE4.2:

1.Qe2 g5 2.Be5 Bxe6 3.0-0-0
+/- (0.90 ++) Depth: 28/57 00:02:09 900mN
(Om, Bhubaneswar 13.03.2013)

Old ones are faster.
New game
r1b1kb1r/1p2p2p/pq2Pnp1/2p5/2B2B2/2N2P2/PPP4P/R2QK2R w KQkq - 0 1

Analysis by Stockfish 2.1.1 PA GTB Gran2c 64bit:

1.Qe2 Bg7 2.0-0-0 0-0 3.Bg5 Qc6 4.Kb1 Ra7 5.a4 Kh8 6.Rhf1 b6 7.Qe3 Bb7 8.Bf4 Nh5 9.Be5 Nf6 10.Bd5 Nxd5 11.Nxd5
+/- (0.91) Depth: 21/35 00:00:16 66723kN
(Om, Bhubaneswar 13.03.2013)
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