Author: Tim Foden
Date: 23:19:26 07/27/03
Go up one level in this thread
On July 27, 2003 at 11:05:08, Peter Berger wrote:
>[D]8/5KBB/p4b2/1pp1kb2/8/1P6/1P5P/8 b - - 0 1
>
>That's Em. Lasker - Tarrasch, St. Petersburg 1914
>
>The position is won easily with 1...Be6+ 2. Kg6 Bxg7 3. Kxg7 Bxb3 4. h4 Bd1 -+
>
>But not with 1...Bxg7? 2. Bxf5 =+
>
>The pawn endgame is drawn: 2. ...Kxf5?! 3. Kg7 a5 4. h4 Kg4 5. Kg6! ( and not 5.
>Kf6? c4 6. bc bc 7. Ke5 c3 8. bc a4 9. Kd4 a3 -+, Tarrasch's idea) Kh4 6. Kf5
>Kg3 7. Ke4 Kf2 8. Kd5 Ke3 9. Kc5 Kd3 10. Kb5 Kc2 11. Ka5 Kb3 1/2-1/2
>
>The bishop's ending after 2. Bxf5 is extremely drawish because of the bishops of
>opposite colours.
>
>I only tried Yace so far that had a very hard time with this position
>
>852631702 14:51.1 0.45 20. 1...Bxg7 2.Bxf5 Bh6 3.Bc8 a5 4.Ba6 b4 5.Kg6 Bc1
> 6.h4 Bxb2 7.h5 Kd4 8.h6 Kc3 9.Bc4 Kd2 10.Kf5
> Ke3 11.h7H Bh8H {80}
>
>How do other engines do? Please give them some time to see if they really keep
>Be6+ .
>
>Peter
GLC 3.00, AXP 1.47GHz, 24MB hash, likes Be6+ almost immediately (0.32 secs), and
sticks with it through 20 minutes. It doesn't get the sequence required until
20 ply after 1:52. Even then it has 2. Kf8 instead of 2. Kg6, but the next king
move is the correct 3. Kxg7, so this has the same effect in the end.
Cheers, Tim. (GLC site --> http://www.7sun.com/chess)
Analysis:
Game stage: Endgame
Current eval: 0.797
Ply Time Score Nodes Principal variation
6 0.010 +1.234 5994 Be6+ 2. Kg6 Bxg7 3. Kxg7 {ht}
6 0.010 +1.234 8660 Be6+ 2. Kg6 Bxg7 3. Kxg7 {ht}
7 0.020 +1.134 23854 Be6+ 2. Kf8 Bxb3 3. h4 Bd1 4. Bg6 a5 5. Bxf6+ Kxf6
6. h5
7 0.040 +1.134 29090 Be6+ 2. Kf8 Bxb3 3. h4 Bd1 4. Bg6 a5 5. Bxf6+ Kxf6
6. h5
8 0.060 +1.190 42929 Be6+ 2. Kf8 Bxb3 3. h4 Bd1 4. Bg6 a5 5. h5 Bxg7+
6. Kxg7 Bb3
8 0.060 +1.190 47472 Be6+ 2. Kf8 Bxb3 3. h4 Bd1 4. Bg6 a5 5. h5 Bxg7+
6. Kxg7 Bb3
9 0.090 +1.167 75396 Be6+ 2. Kf8 Bxb3 3. h4 Bd1 4. Bg6 a5 5. h5 Bb3 6.
h6
9 0.110 +1.305 92993 Bxg7 2. Kxg7 Bxh7 3. Kxh7 Kf5 4. Kg7 Kg4 5. Kf6
Kh3 6. b4 cxb4
9 0.110 +1.305 96193 Bxg7 2. Kxg7 Bxh7 3. Kxh7 Kf5 4. Kg7 Kg4 5. Kf6
Kh3 6. b4 cxb4
10 0.240 +0.905 224512 Bxg7 {--} 2. Bxf5 Kxf5 3. Kxg7 Kg4 4. Kf6 Kh3 5.
Ke5 Kxh2 6. Kd5 c4 7. bxc4
10 0.260 +0.459 241257 Bxg7 2. Bxf5 Kxf5 3. Kxg7 Kg4 4. Kf6 Kh3 5. Ke5
Kxh2 6. Kd5 a5 7. Kxc5
10 0.320 +0.661 295797 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 Kd5 5. Kf6 Kd4
6. Bf5 Bxf5 7. Kxf5 a5
10 0.330 +0.661 303276 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 Kd5 5. Kf6 Kd4
6. Bf5 Bxf5 7. Kxf5 a5
11 0.430 +0.713 406380 Be6+ 2. Kg6 Bxg7 3. Kxg7 Kf4 4. Bc2 Ke3 5. Kf6 Kd2
6. Bd1 Bg8 7. Kg7 Bd5
11 0.460 +0.713 434388 Be6+ 2. Kg6 Bxg7 3. Kxg7 Kf4 4. Bc2 Ke3 5. Kf6 Kd2
6. Bd1 Bg8 7. Kg7 Bd5
12 0.570 +0.722 542493 Be6+ 2. Kg6 Bxg7 3. Kxg7 Kf4 4. Bg8 Bxg8 5. Kxg8
Ke4 6. h4 Kf5 7. h5 Kg5 8. b4 cxb4
12 0.640 +0.722 597125 Be6+ 2. Kg6 Bxg7 3. Kxg7 Kf4 4. Bg8 Bxg8 5. Kxg8
Ke4 6. h4 Kf5 7. h5 Kg5 8. b4 cxb4
13 1.011 +0.624 954883 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 Ke6 5. Bf7+
Kf5 6. Bg6+ Kg5 7. Kf7 Bg2 8. Bc2 Bd5+ 9. Ke7
Kg4 10. Kd6
13 1.111 +0.624 1056955 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 Ke6 5. Bf7+
Kf5 6. Bg6+ Kg5 7. Kf7 Bg2 8. Bc2 Bd5+ 9. Ke7
Kg4 10. Kd6
14 1.592 +0.604 1534989 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 a5 5. Bf7 Kd6
6. Be8 b4 7. Kf6 Be6 8. Bf7 Bxf7 9. Kxf7 Kd5
14 1.792 +0.604 1733782 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 a5 5. Bf7 Kd6
6. Be8 b4 7. Kf6 Be6 8. Bf7 Bxf7 9. Kxf7 Kd5
15 2.673 +0.566 2619525 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 a5 5. Bd3 b4
6. Bc2 {ht}
15 3.064 +0.566 2998674 Be6+ 2. Kg6 Bxg7 3. Kxg7 Bh3 4. Bg6 a5 5. Bd3 b4
6. Bc2 {ht}
16 11.216 +0.474 10926k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bh3 4. Bg8 a5 5. Bf7 b4
6. Kg6 Kd6 7. Kg5 Ke7 8. Bc4 Kd7 9. Kf4 Kd6 10.
Kg3 Bf5
16 11.997 +0.474 11672k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bh3 4. Bg8 a5 5. Bf7 b4
6. Kg6 Kd6 7. Kg5 Ke7 8. Bc4 Kd7 9. Kf4 Kd6 10.
Kg3 Bf5
17 15.722 +0.475 15300k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bh3 4. Bg8 a5 5. Bf7 Kd4
6. Kf6 Kd3 7. Ke5 Kc2 8. Kd6 Kxb2 9. Kxc5 a4 10.
Kxb5 Bd7+ 11. Kb4 a3
17 17.545 +0.475 17189k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bh3 4. Bg8 a5 5. Bf7 Kd4
6. Kf6 Kd3 7. Ke5 Kc2 8. Kd6 Kxb2 9. Kxc5 a4 10.
Kxb5 Bd7+ 11. Kb4 a3
18 35.731 +0.474 34890k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Kf4 4. Bg6 Kg5 5. Bf7
Bg4 6. Bd5 Bh5 7. Kf8 Kf6 8. h4 b4 9. Bc4 a5 10.
Bd5 {ht}
18 39.957 +0.474 38450k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Kf4 4. Bg6 Kg5 5. Bf7
Bg4 6. Bd5 Bh5 7. Kf8 Kf6 8. h4 b4 9. Bc4 a5 10.
Bd5 {ht}
19 1:05.66 +0.874 63273k Be6+ {++} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 b4 5. h5
c4 6. h6 c3 7. bxc3 bxc3 8. Kg6
19 1:16.72 +0.873 73357k Be6+ {--} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 b4 5. h5
c4 6. Bg8 Kd4 7. h6 Bc2 8. h7 Bxh7 9. Bxh7 c3
10. b3 a5
19 1:19.34 +0.888 75810k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 b4 5. h5 c4
6. Bg8 Kd4 7. h6 Bc2 8. Bf7 c3 9. bxc3+ bxc3 10.
Bg6 Bxg6 11. Kxg6 c2 12. h7 c1=Q 13. h8=Q+ Kd3
14. Qd8+ Ke2 15. Qa5 Qc4
19 1:19.35 +0.888 75810k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 b4 5. h5 c4
6. Bg8 Kd4 7. h6 Bc2 8. Bf7 c3 9. bxc3+ bxc3 10.
Bg6 Bxg6 11. Kxg6 c2 12. h7 c1=Q 13. h8=Q+ Kd3
14. Qd8+ Ke2 15. Qa5 Qc4
20 1:35.22 +1.288 90399k Be6+ {++} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 a4 11. b4 Kc4 12. Kh6 Kxb4
20 1:45.96 +1.287 100183k Be6+ {--} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 a4 11. b4 Kc4
20 1:51.78 +1.326 105549k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bd1 c3 9. b3 a5 10.
Kf6 Kd3 11. Bg4 c2 12. Bf5+ Kd2 13. Bxc2 Kxc2
20 1:51.78 +1.326 105549k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bd1 c3 9. b3 a5 10.
Kf6 Kd3 11. Bg4 c2 12. Bf5+ Kd2 13. Bxc2 Kxc2
21 2:23.16 +0.926 133923k Be6+ {--} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 {ht}
21 2:30.29 +0.927 140635k Be6+ {++} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Bc6 c2
14. Kh6 c1=Q+ 15. Kh7
21 3:23.56 +1.465 188980k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5 10.
Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Kf6 Kd4
21 3:23.56 +1.465 188980k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5 10.
Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Kf6 Kd4
22 4:05.74 +1.065 226478k Be6+ {--} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
22 4:19.79 +1.066 239450k Be6+ {++} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Bb5+
Kc2 14. Kh6 Kb3 15. Bc6
22 5:05.23 +1.356 280980k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5 10.
Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Kf6 Kd2
14. Ke5 Kd3
22 5:05.23 +1.356 280980k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5 10.
Bc2 a4 11. bxa4 bxa4 12. Bxa4 Kd3 13. Kf6 Kd2
14. Ke5 Kd3
23 6:50.10 +1.756 373755k Be6+ {++} 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5.
Bg6 c4 6. h5 Bxh5 7. Bxh5 Kd4 8. Bg6 c3 9. b3 a5
10. Bc2 Ke3 11. Bh7 Kd2 12. Bg6 c2 13. Bh7 c1=Q
14. b4
23 11:59.6 +2.870 641937k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Kf6 b4 9. Bd1 b3 10.
Kf5 c3 11. Bxb3 cxb2 12. Ba2 a5 13. Bb1 Kc3 14.
Kf4
23 12:17.6 +2.870 659471k Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Kf6 b4 9. Bd1 b3 10.
Kf5 c3 11. Bxb3 cxb2 12. Ba2 a5 13. Bb1 Kc3 14.
Kf4
24 20:58.7 +3.268 1116m Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Kf6 b4 9. Bd1 b3 10.
Kf5 c3 11. Bxb3 cxb2 12. Ba2 a5 13. Bb1 Kc3 14.
Kf4 a4
24 21:32.4 +3.268 1149m Be6+ 2. Kf8 Bxg7+ 3. Kxg7 Bxb3 4. h4 Bd1 5. Bg6 c4
6. h5 Bxh5 7. Bxh5 Kd4 8. Kf6 b4 9. Bd1 b3 10.
Kf5 c3 11. Bxb3 cxb2 12. Ba2 a5 13. Bb1 Kc3 14.
Kf4 a4
Analyse>exit
local: t=32:26.0 nps=882480.4 n=1717322691 (36.4% / 63.6%)
total: t=1:07:13 nps=830202.5 n=3348040602
stats: fh=89.6%/3.93%/1.355% draws=2351043
trans: probes=621787375 hits=180141504 (28.97%) draft=140812857 (22.65%)
tcuts: exact=32580 (0.01%) upper=107011758 (17.21%) lower=28559039 (4.59%)
tstor: exact=23456 (0.01%) upper=177198866 (67.47%) lower=85402874 (32.52%)
ext: check=157107863 recap=6311918 ppush=9172169 1rep=3440777 thrt=0
q-moves: gen=288255658 tested=241651580 made/un=138582164 max-dep=8
max eval diff: part-1=7.133 part-2=4.680
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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