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Subject: Re: tough position for amateurs

Author: Tim Foden

Date: 05:50:10 07/05/04

Go up one level in this thread


On July 04, 2004 at 23:06:55, Will Singleton wrote:

>black to play and equalize...
>
>[d]7k/8/p2b2r1/R2P1ppq/6b1/2P1B1P1/2rN1Q1P/4R2K b - -


Green Light 3.01.2.2 thinks Bxg3, but takes 10 minutes before it finds this
move, and 25 minutes to get up to -0.379.

Cheers, Tim.

Analysis (48MB Hash, AXP 2.1GHz):

 Game stage: Middle game
 Current eval: -0.852
 Ply   Time   Score   Nodes  Principal variation
  4   0.010  -1.375    6680  Kg8 2. Rxa6 Rxc3 3. Ra8+ Kh7
  4   0.010  -1.375   12764  Kg8 2. Rxa6 Rxc3 3. Ra8+ Kh7
  5   0.020  -1.608   16210  Kg8 2. Rxa6 Rxc3 3. Ra8+ Kh7 4. Kg1
  5   0.050  -1.124   50056  Bc7 2. Rc5 Bd6 3. Bd4+ Kg8 4. Rc8+ Kh7
  5   0.050  -1.124   53343  Bc7 2. Rc5 Bd6 3. Bd4+ Kg8 4. Rc8+ Kh7
  6   0.120  -1.362  142442  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Kg1 Rc2
  6   0.150  -1.362  173278  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Kg1 Rc2
  7   0.190  -1.453  217243  Kh7 2. Rxa6 Rxc3 3. Ra7+ Rc7 4. Rxc7+ Bxc7 5. Kg1
                               Bd6 6. Bd4
  7   0.290  -1.076  365881  Bc7 2. Raa1 Kg8 3. c4 Be5 4. Ra5 Rd6
  7   0.360  -1.076  441600  Bc7 2. Raa1 Kg8 3. c4 Be5 4. Ra5 Rd6
  8   0.971  -1.476 1227496  Bc7 {--} 2. Bd4+ Kg8 3. Rc5 Bxg3 4. Qxg3 Rxd2 5.
                               Rc8+ Kf7 6. Re7+ Kxe7 {ht} 7. Qc7#
  8   1.051  -2.289 1336317  Bc7 2. Bd4+ Kg8 3. Rc5 Bd6 4. Rc8+ Bf8 5. Rce8 Rd6
                               6. c4
  8   1.051  -1.475 1336318  Kh7 {++} {ht} 2. Rxa6
  8   1.122  -1.465 1430097  Kh7 2. Rxa6 Rxc3 3. Ra7+ Rc7 4. Rxc7+ Bxc7 5. Bd4
                               Kh6 6. Kg1 Bd6
  8   1.132  -1.465 1430139  Kh7 2. Rxa6 Rxc3 3. Ra7+ Rc7 4. Rxc7+ Bxc7 5. Bd4
                               Kh6 6. Kg1 Bd6
  9   1.582  -1.529 2016677  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Rh8+
                               Rh7 6. Rxh7+ Kxh7 7. Bc5 {ht} Bxc5
  9   2.684  -1.529 3446513  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Rh8+
                               Rh7 6. Rxh7+ Kxh7 7. Bc5 {ht} Bxc5
 10   4.997  -1.621 6247042  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Bb6 Rf7
                               6. Bc5 Kh7 7. Bxd6 Rxd6
 10   8.182  -1.621  10375k  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Bb6 Rf7
                               6. Bc5 Kh7 7. Bxd6 Rxd6
 11  11.226  -1.621  14331k  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Bb6 Rf7
                               6. Bc5 Kh7 7. Bxd6 Rxd6
 11  18.456  -1.621  23803k  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Ra8 Rc7 5. Bb6 Rf7
                               6. Bc5 Kh7 7. Bxd6 Rxd6
 Generating internal KP-K end-game table...
 Done (0.150 secs)
 12  31.595  -1.660  40842k  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Kg1 Qh3 5. Ra8 Rc7
                               {ht} 6. Bb6
 12 1:36.19  -1.660 121540k  Kh7 2. Rxa6 Rxc3 3. Ra7+ Kh6 4. Kg1 Qh3 5. Ra8 Rc7
                               {ht} 6. Bb6
 13 2:25.06  -1.730 183326k  Kh7 2. Rxa6 f4 3. Ra7+ Rg7 4. Rxg7+ Kxg7 5. Bd4+
                               Kh6 6. Kg1 Bf5 7. Ra1 Qh3 8. c4 fxg3 9. hxg3
                               Qxg3+ 10. Qxg3 Bxg3 11. Ra6+ Kh5
 13 4:45.27  -1.394 354215k  f4 2. Bd4+ Kg8 3. Rxa6 Rxd2 4. Qxd2 fxg3 5. Ra8+
                               Kf7 6. h3 Qxh3+ 7. Kg1 Qh2+ 8. Qxh2 gxh2+ 9. Kg2
                               Rg8 10. Rf1+ Bf4
 13 5:11.39  -1.394 386776k  f4 2. Bd4+ Kg8 3. Rxa6 Rxd2 4. Qxd2 fxg3 5. Ra8+
                               Kf7 6. h3 Qxh3+ 7. Kg1 Qh2+ 8. Qxh2 gxh2+ 9. Kg2
                               Rg8 10. Rf1+ Bf4
 14 8:18.73  -1.440 611497k  f4 2. Bd4+ Kg8 3. Rxa6 Rxd2 4. Qxd2 fxg3 5. Ra8+
                               Kf7 6. h3 Qxh3+ 7. Kg1 Qh2+ 8. Qxh2 gxh2+ 9. Kg2
                               Rh6 10. Ra7+ Kg6 11. Kh1
 14 10:31.8  -1.239 781179k  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qf5 5. Re8+
                               Kh7 6. Qxf5 Bxf5 7. Re7+ Rg7 8. Rxg7+ Kxg7 9.
                               Nb3 Be4+ 10. Kg1 Rxc3 11. Nd4 Rc1+ 12. Kf2
 14 12:55.4  -1.239 945149k  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qf5 5. Re8+
                               Kh7 6. Qxf5 Bxf5 7. Re7+ Rg7 8. Rxg7+ Kxg7 9.
                               Nb3 Be4+ 10. Kg1 Rxc3 11. Nd4 Rc1+ 12. Kf2
 15 14:09.5  -1.047   1043m  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qf5 5. Qxf5
                               Bxf5 6. Nf3 Rxc3 7. Re8+ Kg7 8. Ne1 Bh3 9. Re7+
                               Kf8 10. Re4
 15 19:21.2  -1.047   1418m  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qf5 5. Qxf5
                               Bxf5 6. Nf3 Rxc3 7. Re8+ Kg7 8. Ne1 Bh3 9. Re7+
                               Kf8 10. Re4
 16 22:37.9  -0.647   1675m  Bxg3 {++} 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qg5 5.
                               Qxg5 Rxg5 6. Rxa6 Rxd2 7. Kg1
 16 25:29.6  -0.379   1903m  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qg5 5. Re8+
                               Kh7 6. Qxg5 Rxg5 {ht} 7. Re7+
 16 42:17.3  -0.379   3058m  Bxg3 2. Qxg3 f4 3. Bxf4 gxf4 4. Qxf4 Qg5 5. Re8+
                               Kh7 6. Qxg5 Rxg5 {ht} 7. Re7+
Analyse>exit
 local:  t=48:27.1  nps=1201975.1  n=3494261712 (22.3% / 77.7%)
 total:  t=48:27.1  nps=1201975.1  n=3494261712
 stats:  fh=91.5%/3.32%/1.332%  draws=2193434
 trans:  probes=778072829  hits=92750717 (11.92%)  draft=64826314 (8.33%)
 tcuts:  exact=1347 (0.00%)  upper=41667135 (5.36%)  lower=19789573 (2.54%)
 tstor:  exact=2331 (0.00%)  upper=310757682 (70.17%)  lower=132131813 (29.83%)
 ext:  check=291277050  recap=9753064  ppush=4418544  1rep=23773363  thrt=616472

 q-moves:  gen=1696072610  tested=840961071  made/un=275963565  max-dep=14
 max eval diff:  part-1=4.231  part-2=3.201



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