Author: Tim Foden
Date: 13:52:34 09/25/03
Go up one level in this thread
On September 25, 2003 at 11:45:15, Tord Romstad wrote:
>In the latest round of the Open Class of the Regensburg Winboard Circuit,
>my program (playing black) reached the following position:
>
>[D]r5k1/P6p/Q4pp1/3p3r/3pb3/5P2/2P2KPq/R1R2B2 b - - bm Bxf3;
>
>Because of the strong attack against the white king, my program evaluates
>the position as very good for black. Unfortunately, it was not able to
>find a forced win quickly enough. The continuation was Qh4+ Kg1 Qf4
>(there was a draw here by Qh2+, of course), and my program eventually lost.
>
>When analysing the game with the help of my engine, I found that Bxf3!
>seems to win for black. My engine needs 2 minutes and 18 seconds to
>find this move when running on an Athlon MP 2.0 GHz (analysis below),
>which I find quite disappointing.
>
>How fast do other engines solve this position?
GLC 3.00 gets it in 38 seconds on my machine. :)
Cheers, Tim.
Analysis (AXP 1.67GHz, 24MB hash)...
>anal
Game stage: Middle game
Current eval: 1.080
Ply Time Score Nodes Principal variation
4 0.010 +0.500 11238 Qh4+ 2. Kg1 Bf5 3. Qd6 Qh1+ 4. Kf2 Qh4+ 5. Kg1
4 0.020 +0.651 13803 Rf5 2. Qe6+ Kh8 3. Be2 Rf4
4 0.020 +0.651 21702 Rf5 2. Qe6+ Kh8 3. Be2 Rf4
5 0.060 +0.550 51411 Qh4+ 2. g3 Qh2+ 3. Bg2 Rf5 4. Qe6+ Kh8 5. Ra6
5 0.110 +0.964 86415 Qf4 2. Qb7 Qe3+ 3. Kg3 Rg5+ 4. Kh2 Qf4+ 5. Kg1
Qe3+ 6. Kh1
5 0.120 +0.964 102855 Qf4 2. Qb7 Qe3+ 3. Kg3 Rg5+ 4. Kh2 Qf4+ 5. Kg1
Qe3+ 6. Kh1
6 0.190 +0.797 169021 Qh4+ 2. g3 Qh2+ 3. Bg2 Rf5 4. Qe6+ Kh8 5. Ra3 h6
6 0.230 +0.797 213358 Qh4+ 2. g3 Qh2+ 3. Bg2 Rf5 4. Qe6+ Kh8 5. Ra3 h6
7 0.470 +0.867 477574 Qh4+ 2. Kg1 Qf4 3. Qe2 Qh2+ 4. Kf2 Rf5 5. Ke1 Qg3+
6. Qf2 Qe5
7 0.620 +0.867 626967 Qh4+ 2. Kg1 Qf4 3. Qe2 Qh2+ 4. Kf2 Rf5 5. Ke1 Qg3+
6. Qf2 Qe5
8 1.091 +1.239 1053958 Qh4+ 2. Kg1 Qf4 3. Qe2 Rh4 4. Qe1 Qh2+ 5. Kf2 Rf4
6. Be2 h6
8 1.372 +1.239 1337653 Qh4+ 2. Kg1 Qf4 3. Qe2 Rh4 4. Qe1 Qh2+ 5. Kf2 Rf4
6. Be2 h6
9 5.778 +0.839 5361956 Qh4+ {--} 2. Kg1 Qf4 3. Re1 Bxc2 4. Qc6 Qe3+ 5.
Rxe3 dxe3
9 8.201 +0.000 7650766 Qh4+ 2. Kg1 Qf4 3. Re1 Qh2+ 4. Kf2 Qh4+ 5. Kg1
Qh2+
9 10.084 +0.000 9550158 Qh4+ 2. Kg1 Qf4 3. Re1 Qh2+ 4. Kf2 Qh4+ 5. Kg1
Qh2+
10 14.090 +0.000 13208k Qh4+ 2. Kg1 Qf4 3. Re1 Qh2+ 4. Kf2 Qh4+ 5. Kg1
Qh2+
10 32.156 +0.358 29999k Qf4 2. Re1 Rh2 3. Rxe4 dxe4 4. Qb7 Qxf3+ 5. Kg1
Rxg2+ 6. Bxg2 Qe3+ 7. Kh1 Qh6+ 8. Kg1
10 38.034 +0.400 35449k Bxf3 {++} 2. Kxf3 Rf5+ 3. Ke2 Qf4 4. Kd1 Qxf1+ 5.
Qxf1 Rxf1+ 6. Kd2 Rxc1 7. Rxc1
10 47.999 +1.582 44888k Bxf3 2. Qe6+ Kg7 3. Qe7+ Kh6 4. Qxf6 Bxg2 5. Bxg2
Rg5 6. Ke1 Rxg2 7. Qxd4
10 48.149 +1.582 45062k Bxf3 2. Qe6+ Kg7 3. Qe7+ Kh6 4. Qxf6 Bxg2 5. Bxg2
Rg5 6. Ke1 Rxg2 7. Qxd4
11 59.375 +1.887 55059k Bxf3 2. Qe6+ Kg7 3. Qe7+ Kh6 4. Qxf6 Bxg2 5. Bxg2
Rg5 6. Rh1 Rxg2+ 7. Kf3 Rf2+ 8. Kg4 Rxf6 9.
Rxh2+ Kg7 10. Kg5
11 1:07.03 +1.887 63237k Bxf3 2. Qe6+ Kg7 3. Qe7+ Kh6 4. Qxf6 Bxg2 5. Bxg2
Rg5 6. Rh1 Rxg2+ 7. Kf3 Rf2+ 8. Kg4 Rxf6 9.
Rxh2+ Kg7 10. Kg5
12 1:50.47 +2.048 101802k Bxf3 2. Qe6+ Kg7 3. Qd7+ Kh6 4. Kxf3 Rf5+ 5. Qxf5
gxf5 6. Bd3 Kg5 7. Rf1 Qc7 8. Ra4 Rxa7 9. Rxd4
Analyse>exit
local: t=3:52.01 nps=923474.5 n=214258082 (20.4% / 79.6%)
total: t=3:52.01 nps=923474.5 n=214258082
stats: fh=91.8%/3.47%/1.233% draws=75898
trans: probes=43705815 hits=5633924 (12.89%) draft=3863068 (8.84%)
tcuts: exact=476 (0.00%) upper=2192013 (5.02%) lower=808416 (1.85%)
tstor: exact=1057 (0.00%) upper=19414584 (70.46%) lower=8140055 (29.54%)
ext: check=18150216 recap=497163 ppush=348325 1rep=1683552 thrt=0
q-moves: gen=137135364 tested=62694669 made/un=24458098 max-dep=12
max eval diff: part-1=4.224 part-2=3.334
>
>Tord
>
> 1 4.02 0.01 671 h5f5 a6e6 g8h8
> 2 2.56 0.05 4915 h5f5 f2e1 h2h4 e1d1
> 3 3.22 0.15 15182 h2h4 g2g3 h4h2 f1g2 h5f5 a6e6 g8h8
> 4 3.22 0.30 32617 h2h4 g2g3 h4h2 f1g2 h5f5 a6e6 g8h8
> 5 2.95 0.96 140695 h2h4 g2g3 h4h2 f1g2 h5f5 a6e6 g8h8 a1a3
> 6 <= 2.94 2.35 407456 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 g8h8 a6d6
> 6 <= 2.92 2.38 420515 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 g8h8 a6d6
> 6 <= 2.89 2.46 441964 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 g8h8 a6d6
> 6 >= 2.83 2.51 451143 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 d4d3 a3d3
> e4d3 c2d3
> 6 <= 2.83 2.66 487752 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 d4d3 a3d3
> e4d3 c2d3
> 6 2.83 2.66 487752 h2h4 g2g3 h4h2 f1g2 h5f5 a1a3 d4d3 a3d3
> e4d3 c2d3
> 7 <= 2.81 6.16 1176183 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 g8h8 c1h1
> 7 <= 2.80 6.25 1204921 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 g8h8 c1h1
> 7 <= 2.77 6.36 1240122 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 g8h8 c1h1
> 7 >= 2.70 6.41 1249047 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7
> 7 >= 2.72 6.41 1249316 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7
> 7 <= 2.75 6.62 1303271 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7
> 7 >= 2.75 6.62 1303551 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7
> 7 2.75 6.62 1303551 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7
> 8 <= 2.73 16.78 3326090 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7 c1h1
> 8 <= 2.72 17.31 3467308 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7 c1h1
> 8 <= 2.69 18.43 3730007 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7 c1h1
> 8 <= 2.61 19.81 4061165 h2h4 g2g3 h4h2 f1g2 h5f5 a6e2 f5f3 e2f3
> e4f3 f2f3 g8f7 c2c3
> 8 <= 2.45 28.24 5809887 h2h4 g2g3 h4h2 f1g2 h5f5 a6e6 g8h8 e6f5
> e4f5 c1h1
> 8 <= 2.19 35.23 7296744 h2h4 g2g3 h4h2 f1g2 h5f5 a6e6 g8h8 e6f5
> e4f5 c1h1
> 8 >= 1.80 35.59 7371214 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 >= 1.81 35.62 7377345 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 >= 1.88 35.65 7385141 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 >= 2.02 35.72 7401812 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 <= 2.17 36.09 7518773 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 <= 2.16 36.53 7652501 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 >= 2.14 36.58 7665816 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 <= 2.14 37.11 7814723 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 8 2.14 37.11 7814723 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 f3f2
> 9 <= 2.12 78.98 16143475 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 c1h1
> 9 <= 2.11 83.56 17204527 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 c1h1
> 9 <= 2.08 88.61 18381921 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 c1h1
> 9 <= 2.00 98.96 20665968 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 c1h1
> 9 <= 1.84 117.39 24588293 h2h4 g2g3 h4h2 f1g2 e4f3 a6e6 g8g7 f2f3
> h5f5 e6f5 g6f5 c1h1
> 9 >= 1.59 123.07 25721231 h2h4 g2g3 h4g5 a6e2 e4f3 e2e6 g8g7 f2f3
> 9 >= 1.61 123.21 25754778 h2h4 g2g3 h4g5 a6e2 e4f3 e2e6 g8g7 f2f3
> 9 >= 1.67 137.94 28705994 e4f3 a6b7 h2f4 b7a8 g8g7 a8f8 g7f8 a7a8Q
> f8g7 a8b7 g7h6 g2f3 f4e3
> 9 >= 1.81 139.57 29073059 e4f3 a6b7 h2f4 b7a8 g8g7 a8f8 g7f8 a7a8Q
> f8g7 a8b7 g7h6 g2f3 f4e3
> 9 <= 1.83 144.99 30316210 e4f3 a6b7 h2f4 b7a8 g8g7 a8f8 g7f8 a7a8Q
> f8g7 a8b7 g7h6 g2f3 f4e3
> 9 >= 1.83 145.23 30380703 e4f3 a6b7 h2f4 b7a8 g8g7 a8f8 g7f8 a7a8Q
> f8g7 a8b7 g7h6 g2f3 f4e3
> 9 1.83 145.23 30380703 e4f3 a6b7 h2f4 b7a8 g8g7 a8f8 g7f8 a7a8Q
> f8g7 a8b7 g7h6 g2f3 f4e3
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