Author: Dann Corbit
Date: 20:55:11 12/18/00
Go up one level in this thread
On December 18, 2000 at 22:59:33, Laurence Chen wrote:
>This position has bothered the most for the longest time, it was fascinating to
>see that the chess engines I used to analyse this position gives a ? or ?? for
>Black's move 26. ... Bg7. Eric Schiller awarded this move !!, Fritz awarded ??,
>so the $64.00 question, who is right? The position is listed below before
>Black's 26. ... Bg7
>[D]r5k1/ppp4p/3p3b/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 b - - 0 26
>
>Now Fritz 6, and Gambit Tiger like the move 26. ... c5+, when I play the move
>26. ... Bg7, both engines think that White can save this position, can this
>position be really saved after 26. ... Bg7?
>
>[D]r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 w - - 0 27
>
>This position seems to be a tough nut to crack. It could be one of those
>positions which humans are better than chess engines in tactics !!!
For your proposed solution, the programs I tried respond with Ng1, yeilding a
drawish score. Here is Phalanx:
r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 w - -
4 349 95 79195 Bb2-c3
4 -> 0:01.06 91493 0 turns
5 349 147 149236 Bb2-c3 ??
5 289 235 285004 Bb2-c3
5 -> 0:02.89 364171 0 turns
6 289 345 435133 Bb2-c3 ??
6 -29996 588 813326 Bb2-c3 Pb7-b5 Bc3xb4 Ne5-c6
6 -29991 707 997964 Rh2xh7 !
6 -20 1194 1788638 Rh2xh7 Kg8xh7 Bb2-c3 Pc7-c5 Pd5xc6 Ne5xc6
Kd4-c4 Pb7-b5 Kc4xb5 Bg7xc3 Ne2xc3 Rf3xc3
6 -> 0:19.78 2971236 1 turn
7 -20 2513 3796818 Rh2xh7 ??
7 -137 4445 6970983 Rh2xh7 Kg8xh7 Ne2-c3 Pc7-c5 Pd5xc6 Ra8-c8
Pc6-c7 Rc8xc7 Pa2-a3
7 -132 7931 12485760 Ne2-g1 !
7 -78 10975 17307703 Ne2-g1 Pc7-c5 Pd5xc6 Ne5-d3 Kd4-c4 Pb7-b5
Kc4xb5 Ra8-b8 Kb5-a4 Nd3xb2 Ka4-a3 Nb2-c4
Ka3-a4
7 -> 1:51.48 17552711 1 turn
8 -82 21702 34180177 Ne2-g1 Pc7-c5 Pd5xc6 Ne5-d3 Kd4-c4 Pb7-b5
Kc4xb5 Ra8-b8 Kb5-a4 Nd3xb2 Ka4-a3 Nb2-c4
Ka3-a4 Nc4-b6 Ka4-a3 Nb6-c4
8 -> 3:39.84 34591997 0 turns
9 -82 56054 86434387 Ne2-g1 Pc7-c5 Pd5xc6 Ne5-d3 Kd4-c4 Pb7-b5
Kc4xb5 Ra8-b8 Kb5-a4 Nd3xb2 Ka4-a3 Nb2-c4
Ka3-a4 Nc4-b6 Ka4-a3 Nb6-c4
9 -> 9:50.55 90779427 0 turns
Depth=10, Value=-82, Time=999.02, Last turn=79.31, Nodes=150955328, N/s=151103
PV = Ne2-g1 Pc7-c5 Pd5xc6 Ne5-d3 Kd4-c4 Pb7-b5 Kc4xb5 Ra8-b8
Kb5-a4 Nd3xb2 Ka4-a3 Nb2-c4 Ka3-a4 Nc4-b6 Ka4-a3 Nb6-c4
Here is crafty:
clearing hash tables
time surplus 0.00 time limit 166:39 (166:39)
nss depth time score variation (1)
4 0.23 4.60 1. Qd2 c5+ 2. dxc6 Nexc6+ 3. Kc4 Bxb2
4. Qg5+ Kh8 5. Rb1
4 0.29 4.64 1. Rb1 Nd3+ 2. Kc4 Bxb2 3. Bxd3 Nxd3
4-> 0.30 4.64 1. Rb1 Nd3+ 2. Kc4 Bxb2 3. Bxd3 Nxd3
5 0.44 -- 1. Rb1
5 0.52 -3.12 1. Rb1 c5+ 2. dxc6 bxc6 3. Bd3 Rxd3+
4. Qxd3 Nxd3+ 5. Ke3 Bxb2 6. Rf1
5 0.77 ++ 1. Ng1!!
5 0.91 1.67 1. Ng1 Nd3+ 2. e5 Bxe5+ 3. Kc4 Nxb2+
4. Kxb4 Bc3+ 5. Kb5 Nxd1 6. Rxd1
5 1.10 ++ 1. Rh5!!
5 1.22 3.01 1. Rh5 Nd3+ 2. Kc4 Nxb2+ 3. Kxb4 a5+
4. Kb5 Nxd1 5. Rxd1
5 1.77 ++ 1. Rxh7!!
5-> 1.90 3.40 1. Rxh7
6 1.93 -- 1. Rxh7
6 2.53 -0.45 1. Rxh7 c5+ 2. dxc6 bxc6 3. Rxg7+ Kxg7
4. Bd3 Rxd3+ 5. Qxd3 Nbxd3 6. Ba3 Rd8
6 3.14 ++ 1. Ng1!!
6 3.85 1.57 1. Ng1 Nd3+ 2. e5 Bxe5+ 3. Kc4 Nxb2+
4. Kxb4 Bc3+ 5. Ka3 Nxd1 6. Rxd1
6-> 4.97 1.57 1. Ng1 Nd3+ 2. e5 Bxe5+ 3. Kc4 Nxb2+
4. Kxb4 Bc3+ 5. Ka3 Nxd1 6. Rxd1
7 5.23 -- 1. Ng1
7 6.11 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
7-> 9.77 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
8 13.27 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
8-> 14.52 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
9 24.85 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
9-> 29.32 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
10 57.79 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
10-> 1:11 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. Kc4 b5+
4. Kxb5 Rb8+ 5. Ka4 Nxb2+ 6. Ka3 Nc4+
7. Ka4 Nb2+
11 3:12 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. e5 Bxe5+
4. Kc4 b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+
7. Ka3 Nc4+ 8. Ka4 Nb2+
11-> 4:05 0.00 1. Ng1 c5+ 2. dxc6 Nd3+ 3. e5 Bxe5+
4. Kc4 b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+
7. Ka3 Nc4+ 8. Ka4 Nb2+
12 9:15 1/29 1. Ng1
Amy:
GamePhase: Middlegame
It Time Score principal Variation
8 3.0 +0.032 1. Rxh7 c5+ 2. dxc6 bxc6 3. Rxg7+ Kxg7 4. Bd3 Rxd3+ 5.
Qxd3 Nbxd3 6. Bc3 Rf8
8 3 306 536598 1. Rxh7 c5+ 2. dxc6 bxc6 3. Rxg7+ Kxg7 4. Bd3
Rxd3+ 5. Qxd3 Nbxd3 6. Bc3 Rf8
8 4.2 +0.032 1. Rxh7 c5+ 2. dxc6 bxc6 3. Rxg7+ Kxg7 4. Bd3 Rxd3+ 5.
Qxd3 Nbxd3 6. Bc3 Rf8
8 3 423 746996 1. Rxh7 c5+ 2. dxc6 bxc6 3. Rxg7+ Kxg7 4. Bd3
Rxd3+ 5. Qxd3 Nbxd3 6. Bc3 Rf8
9 10.7 --- 1. Rxh7
9 0 1074 2129259 1. Rxh7?
9 17.5 -0.800 1. Rxh7 Kxh7 2. Ng1 Rxg3 3. Ne2 Nxc2+ 4. Qxc2 Rd3+ 5.
Qxd3 Nxd3+ 6. Kxd3 Bxb2 7. Rh1+ Kg6 8. Nd4
9 -80 1758 3621480 1. Rxh7 Kxh7 2. Ng1 Rxg3 3. Ne2 Nxc2+ 4. Qxc2
Rd3+ 5. Qxd3 Nxd3+ 6. Kxd3 Bxb2 7. Rh1+ Kg6 8. Nd4
9 35.3 +++ 1. Ng1
9 0 3537 7369503 1. Ng1!
9 37.1 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
9 0 3714 7793163 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
9 37.3 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
9 0 3732 7824279 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
10 1:05 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
10 0 651613693275 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
10 1:12 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
10 0 726015258766 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
11 2:23 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
11 0 1439530615336 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
11 2:50 +0.000 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4 b5+ 5. Kxb5
Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10.
Ka4 Nb2+ 11. Ka3 Nc4+ 12. Ka4 Nb2+
11 0 1705736032249 1. Ng1 c5+ 2. dxc6 Ned3+ 3. e5 Bxe5+ 4. Kc4
b5+ 5. Kxb5 Rb8+ 6. Ka4 Nxb2+ 7. Ka3 Nc4+ 8. Ka4 Nb2+ 9. Ka3 Nc4+ 10. Ka4 Nb2+
11. Ka3 Nc4+ 12. Ka4 Nb2+
Yace:
8 0.002 4.59 1t : Rh2xh7 Kg8xh7 [510]
38 0.006 7.41 1t : Ra1c1 Nb4xa2 [810]
57 0.011 8.31 1t : Qd1d2 [910]
79 0.016 8.31 1. : Qd1d2 [910]
1417 0.026 7.79 2--: Bb2c1 Nb4c6+ d5xc6 Ne5xc6+ Kd4d5 Bg7xa1 Rh2xh7
[730]
2123 0.034 4.80 2t : Qd1d2 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Bg7xb2 [580]
3451 0.045 5.00 2t+: Ra1b1 Ne5d3+ Kd4c4 Bg7xb2 [580]
3962 0.048 5.20 2t : Ra1b1 Ne5d3+ Kd4c4 Bg7xb2 Bc2xd3 Nb4xd3 [570]
4388 0.052 5.35 2t+: Bb2c3 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Bg7xc3 Ne2xc3
Nb4xc2 [580]
5022 0.062 7.40 2t : Bb2c3 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Nb4xc2 Qd1xc2
Bg7xc3 Ne2xc3 Rf3xg3 [800]
5160 0.070 7.40 2. : Bb2c3 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Nb4xc2 Qd1xc2
Bg7xc3 Ne2xc3 Rf3xg3 [800]
11832 0.094 7.40 3t : Bb2c3 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Nb4xc2 Qd1xc2
Bg7xc3 Ne2xc3 Rf3xg3 [800]
13964 0.107 7.40 3. : Bb2c3 c7c5+ d5xc6 Ne5xc6+ Kd4c4 Nb4xc2 Qd1xc2
Bg7xc3 Ne2xc3 Rf3xg3 [800]
39113 0.180 6.90 4--: Ra1b1 Ne5d3+ e4e5 Nb4xc2+ Kd4c4 Nd3xb2+ Rb1xb2
[570]
77093 0.255 4.26 4t : Bb2c3 Rf3f1 Kd4e3 Rf1xd1 Bc2xd1 [410]
121838 0.344 4.27 4t+: Rh2xh7 Ra8e8 Rh7xg7+ Kg8xg7 [840]
124810 0.353 4.26 4t-: Rh2xh7 Kg8xh7 Bc2d3 Ne5xd3+ Kd4c4 [180]
124810 0.353 4.26 4t : Bb2c3 Rf3f1 Kd4e3 Rf1xd1 Bc2xd1 [410]
195936 0.493 4.26 4. : Bb2c3 Rf3f1 Kd4e3 Rf1xd1 Bc2xd1 [410]
378060 0.740 4.26 5t : Bb2c3 Rf3f1 Kd4e3 Rf1xd1 Bc2xd1 [410]
424511 0.858 4.26 5. : Bb2c3 Rf3f1 Kd4e3 Rf1xd1 Bc2xd1 [410]
1026839 1.965 3.76 6--: Bb2c3 Nb4xc2+ Qd1xc2 b7b5 Ra1f1 Rf3xf1 Qc2d3
Ne5xd3+ Kd4xd3 [-280]
1034174 1.983 -Mat02 6t : Bb2c3 b7b5 Bc3xb4 Ne5c6+ [1230]
1045204 1.998 -Mat03 6t+: Rh2xh7 Kg8xh7 null Nb4xc2+ Qd1xc2 c7c5+ [500]
2121603 3.647 1.69 6t : Rh2xh7 c7c5+ d5xc6 b7b5 Rh7xg7+ Kg8xg7 Bc2d3
Rf3xd3+ Qd1xd3 Nb4xd3 [110]
4123758 7.154 1.69 6. : Rh2xh7 c7c5+ d5xc6 b7b5 Rh7xg7+ Kg8xg7 Bc2d3
Rf3xd3+ Qd1xd3 Nb4xd3 [110]
6587189 11.45 1.19 7--: Rh2xh7 c7c5+ d5xc6 b7xc6 Rh7xg7+ Kg8xg7 Bc2d3
Rf3xd3+ Qd1xd3 Ne5xd3 e4e5 [10]
7947035 13.16 -0.26 7t : Rh2xh7 c7c5+ d5xc6 b7xc6 Rh7xg7+ Kg8xg7 Bc2d3
Rf3xd3+ Qd1xd3 Nb4xd3 Ra1b1 Ra8e8 [10]
14353564 22.60 -0.25 7t+: Ne2g1 c7c5+ d5xc6 Ne5d3+ Kd4c4 b7b5+ Kc4xb5
Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb4xc2+ Rh2xc2 d6d5
null Nb2xd1 Ra1xd1 d5xe4 [-10]
18107407 27.69 0.00 7t : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
18184596 27.84 0.00 7. : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
33074867 46.67 0.00 8t : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
37218240 53.54 0.00 8. : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
108594248 143.1 0.00 9t : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
120313372 161.2 0.00 9. : Ne2g1 c7c5+ d5xc6 Ne5d3+ e4e5 Bg7xe5+ Kd4c4
b7b5+ Kc4xb5 Ra8b8+ Kb5a4 Nd3xb2+ Ka4a3 Nb2c4+
Ka3a4 Nc4b2+ [680]
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