Test Position: Rossolimo-Nestler, Venice 1954

[MikeGL]

[D] r4rk1/2q2p1p/p1b2p2/1p2p3/1P2P3/P1NBB3/2P1Q1PP/6K1 w - - 0 3

Louis, according to Steffan's line above his Zappa Mexico II has the following lines, but Bb6 followed by Ba5 is strange as this puts the B out of play.

3. Qe2-h5 Kg8-h8 4. Nc3-d5 Bc6xd5 5. e4xd5 f6-f5 6. Bd3xf5 f7-f6 7. d5-d6 Qc7-f7 8. Qh5xf7 Rf8xf7 9. Be3-b6 Rf7-b7 10. Bb6-a5 Ra8-a7 11. Bf5-c8 Rb7-g7
= (0.46) Depth: 25/69 00:15:18.74 25852750kN (28139 KN/s, 33826985 splits, 1607907 aborts)

[Sorgenkind]

Score dropped back to 0 again, maybe draw was the correct result after all.

1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Kg8-h8 4. Nc3-d5 Bc6xd5 5. e4xd5 f6-f5 6. Bd3xf5 f7-f6 7. d5-d6 Qc7-f7 8. Qh5xf7 Rf8xf7 9. Be3-b6 Rf7-b7 10. Bb6-a5 Ra8-a7 11. Bf5-c8 Rb7-g7
= (0.46) Depth: 25/69 00:17:36.83 29731131kN (28132 KN/s, 39237276 splits, 1846638 aborts)
1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Kg8-h8 4. Nc3-d5 Bc6xd5 5. Qh5-h6 Rf8-g8 6. Qh6xf6 Rg8-g7 7. Be3-h6 Ra8-g8 8. e4xd5 Qc7-c3 9. d5-d6 Qc3-a1 10. Kg1-f2 Qa1-d4 11. Kf2-f1 Qd4-d5 12. Bh6xg7 Rg8xg7 13. Kf1-e1 e5-e4 14. Qf6-d8
= (0.00) Depth: 26/71 00:20:52.67 36550245kN (29178 KN/s, 43282847 splits, 2017074 aborts)
1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Kg8-h8 4. Nc3-d5 Bc6xd5 5. Qh5-h6 Rf8-g8 6. Qh6xf6 Rg8-g7 7. Be3-h6 Ra8-g8 8. e4xd5 Qc7-c3 9. d5-d6 Qc3-a1 10. Kg1-f2 Qa1-d4 11. Kf2-f1 Qd4-d5 12. Bh6xg7 Rg8xg7 13. Kf1-e1 e5-e4 14. Qf6-d8
= (0.00) Depth: 26/71 01:29:11.14 155323118kN (29026 KN/s, 88751513 splits, 4199044 aborts)
1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Kg8-h8 4. Nc3-d5 Bc6xd5 5. Qh5-h6 Rf8-g8 6. Qh6xf6 Rg8-g7 7. Be3-h6 Ra8-g8 8. e4xd5 Qc7-c3 9. d5-d6 Qc3-a1 10. Kg1-f2 Qa1-d4 11. Kf2-f1 Qd4-d5 12. c2-c3 Qd5xd3
= (0.00) Depth: 27/73 01:33:55.53 164593173kN (29206 KN/s, 93418664 splits, 4395411 aborts)

Best regards,
Steffen

[zullil]

A long search by Critter (though only on 8 cores, not 48 ) scored this position as 0 too.

[D]r4rk1/2q2p1p/p1b2p2/1p2p3/1P2P3/P1NBB3/2P1Q1PP/6K1 w - - 0 3

[Sorgenkind]

Hi Louis!

Zappa says it's an even position:

1. Nc3-d5 Bc6xd5 2. Qe2-g4 Kg8-h8 3. Qg4-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 17/53 00:00:06.17 61781kN (10007 KN/s, 617797 splits, 31648 aborts)
1. Nc3-d5 Bc6xd5 2. Qe2-g4 Kg8-h8 3. Qg4-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 18/55 00:00:07.44 80235kN (10773 KN/s, 729730 splits, 36981 aborts)
1. Nc3-d5 Bc6xd5 2. Qe2-g4 Kg8-h8 3. Qg4-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 18/55 00:00:08.84 103793kN (11730 KN/s, 874712 splits, 44024 aborts)
1. Nc3-d5 Bc6xd5 2. e4xd5 f6-f5 3. Bd3xf5 f7-f6 4. Be3-c5 Kg8-h8 5. Qe2-f3 Ra8-d8 6. Bf5-e6 Qc7-g7 7. Bc5xf8 Qg7xf8 8. c2-c4 b5xc4
= (0.19) Depth: 19/57 00:00:12.71 167508kN (13179 KN/s, 1278063 splits, 63193 aborts)
1. Nc3-d5 Bc6xd5 2. e4xd5 f6-f5 3. Bd3xf5 f7-f6 4. Be3-c5 Kg8-h8 5. Qe2-f3 Ra8-d8 6. Bf5-e6 Qc7-g7 7. Bc5xf8 Qg7xf8 8. c2-c4 b5xc4
= (0.19) Depth: 19/57 00:00:21.41 370767kN (17317 KN/s, 2431738 splits, 102094 aborts)
1. Nc3-d5 Bc6xd5 2. e4xd5 f6-f5 3. Bd3xf5 Rf8-d8 4. Qe2-g4 Kg8-h8 5. Qg4-h4 f7-f6 6. Qh4xf6 Qc7-g7 7. Qf6-e6 Rd8-e8 8. Qe6-c6 Re8-f8 9. d5-d6 Ra8-d8 10. Qc6xa6 Rf8xf5 11. Qa6xb5 Rd8xd6
= (0.12) Depth: 20/59 00:00:25.72 476093kN (18506 KN/s, 2922531 splits, 123704 aborts)
1. Nc3-d5 Bc6xd5 2. e4xd5 f6-f5 3. Bd3xf5 Rf8-d8 4. Qe2-g4 Kg8-h8 5. Qg4-h4 f7-f6 6. Qh4xf6 Qc7-g7 7. Qf6-e6 Rd8-e8 8. Qe6-c6 Re8-f8 9. d5-d6 Ra8-d8 10. Qc6xa6 Rf8xf5 11. Qa6xb5 Rd8xd6
= (0.12) Depth: 20/59 00:00:31.73 631080kN (19886 KN/s, 3597757 splits, 146533 aborts)
1. Nc3-d5 Bc6xd5 2. e4xd5 f6-f5 3. Bd3xf5 Rf8-d8 4. Qe2-g4 Kg8-h8 5. Bf5xh7 Kh8xh7 6. Qg4-h5 Kh7-g7 7. Be3-h6 Kg7-h8 8. Bh6-e3 Kh8-g8 9. Qh5-g5 Kg8-h8 10. Qg5-h5
= (0.00) Depth: 21/61 00:00:40.56 859247kN (21181 KN/s, 4356989 splits, 181700 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. e4xd5 f6-f5 4. Bd3xf5 f7-f6 5. d5-d6 Qc7-f7 6. Qh5xf7 Rf8xf7 7. Be3-b6 Ra8-b8 8. Bb6-a5 Rb8-b7 9. Bf5-c8 Rb7-d7 10. Bc8xd7 Rf7xd7
= (0.16) Depth: 21/61 00:00:51.47 1154265kN (22422 KN/s, 5335505 splits, 214249 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. e4xd5 f6-f5 4. Bd3xf5 f7-f6 5. d5-d6 Qc7-f7 6. Qh5xf7 Rf8xf7 7. Be3-b6 Ra8-b8 8. Bb6-a5 Rb8-b7 9. Bf5-c8 Rb7-d7 10. Bc8xd7 Rf7xd7
= (0.16) Depth: 21/61 00:00:55.17 1227909kN (22256 KN/s, 5737063 splits, 226702 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. e4xd5 f6-f5 4. Bd3xf5 f7-f6 5. d5-d6 Qc7-f7 6. Qh5-h3 Qf7-b7 7. Qh3-h4 Ra8-d8 8. Be3-c5 Qb7-f7 9. Qh4-h3 Qf7-b7 10. Qh3-h4
= (0.00) Depth: 22/63 00:01:04.37 1543647kN (23980 KN/s, 6276618 splits, 245352 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. e4xd5 f6-f5 4. Bd3xf5 f7-f6 5. d5-d6 Qc7-f7 6. Qh5-h3 Qf7-b7 7. Qh3-h4 Ra8-d8 8. Be3-c5 Qb7-f7 9. Qh4-h3 Qf7-b7 10. Qh3-h4
= (0.00) Depth: 22/63 00:01:23.25 2088060kN (25081 KN/s, 7584282 splits, 302829 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 23/65 00:01:39.11 2620895kN (26443 KN/s, 8384403 splits, 332946 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 23/65 00:02:09.05 3442889kN (26679 KN/s, 10391942 splits, 425025 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 24/67 00:02:32.33 4277274kN (28079 KN/s, 11399535 splits, 458627 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 24/67 00:03:41.70 6350961kN (28646 KN/s, 15088985 splits, 618195 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 25/69 00:04:23.63 7908495kN (29997 KN/s, 16427991 splits, 657616 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 25/69 00:06:01.81 10894705kN (30111 KN/s, 21063531 splits, 859409 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 26/71 00:07:26.42 14080307kN (31540 KN/s, 23134989 splits, 924548 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 26/71 00:10:41.61 20113842kN (31349 KN/s, 30836639 splits, 1251207 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 27/73 00:13:24.48 26305628kN (32699 KN/s, 34305045 splits, 1365901 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 27/73 00:19:09.07 37163798kN (32342 KN/s, 46092066 splits, 1850157 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 28/75 00:24:51.67 50062441kN (33561 KN/s, 52120616 splits, 2051711 aborts)
1. Qe2-h5 Kg8-h8 2. Nc3-d5 Bc6xd5 3. Qh5-f5 Qc7-c8 4. Qf5xf6 Kh8-g8 5. Qf6-g5 Kg8-h8 6. Qg5-f6
= (0.00) Depth: 28/75 00:37:34.69 74167189kN (32894 KN/s, 70194702 splits, 2765103 aborts)

Best regards,
Steffen

[zullil]

Thanks.

I was suggesting that Steffen start a new search from the post-sac position, to try to get a bit deeper (and to possibly find a different line due to the non-deterministic nature of parallel searches).

[Eelco de Groot]

[D]r4rk1/2q2p1p/p1b2p2/1p2p3/1P2P3/P1NBB3/2P1Q1PP/6K1 w - - 0 3

How do engines evaluate this?

Rainbow Serpent evaluates it as very close to zero, after a while


r4rk1/2q2p1p/p1b2p2/1p2p3/1P2P3/P1NBB3/2P1Q1PP/6K1 w - -

Engine: eXperimental Tommy Cooper - Rainbow Serpent Build 291 (Athlon 2009 MHz, 256 MB)
By Tord Romstad, Marco Costalba, Joona Kiiski

1/01 0:00 +1.21 1.Qg4+ (500) 1

2/06 0:00 +1.61 1.Qg4+ Kh8 2.Nd5 Bxd5 3.exd5 Qc3 (1.639) 5

3/05 0:00 +1.37 1.Qg4+ Kh8 2.Qh4 Qe7 3.Qh6 (8.550) 27

4/10 0:00 +1.61 1.Qg4+ Kh8 2.Qh4 Rg8 3.Qxf6+ Rg7
4.Nd5 Bxd5 5.exd5 Qd7 (16.738) 51

5/10 0:00 +1.49 1.Qg4+ Kh8 2.Qh4 Rg8 3.Qxf6+ Rg7
4.Nd5 Bxd5 5.exd5 Qd7 (22.382) 65

6/10 0:00 +1.17-- 1.Qg4+ Kh8 2.Qh4 Rg8 3.Qxf6+ Rg7
4.Nd5 Bxd5 5.exd5 Qd7 (72.667) 160

6/05 0:00 +1.57 1.Qh5 Qd8 2.Nd5 Bxd5 3.exd5 (102.543) 199

7/07 0:00 +1.73 1.Qh5 Rfc8 2.Nd5 Bxd5 3.exd5 e4
4.Bxe4 (145.573) 239

8/10 0:01 +1.52 1.Qh5 Rae8 2.Qh6 Qd6 3.Bc5 Qd8 4.Nd5 Bxd5
5.exd5 e4 (396.140) 352

9/12 0:02 +1.19-- 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bxe4 Rxe4 6.Qxe4 Rg8 (934.622) 418

9/08 0:03 +1.20 1.Qh5 Rfe8 2.Bc5 Qd7 3.Qh4 Re7
4.Qxf6 Re6 (1.597.789) 450

10/13 0:04 +1.23 1.Qh5 Rfe8 2.Bc5 Kh8 3.Qh4 Rg8 4.Nd5 Bxd5
5.exd5 Rg7 6.Qxf6 e4 7.Bxe4 (1.812.709) 453

11/10 0:05 +1.05 1.Qh5 Rfe8 2.Qh6 Re6 3.Qh4 Rae8
4.Nd5 Bxd5 5.exd5 e4 (2.610.475) 466

12/08 0:10 +0.76-- 1.Qh5 Rfe8 2.Qg4+ Kh8 3.Nd5 Bxd5
4.exd5 Rg8 (4.808.407) 480

12/14 0:14 +0.47 1.Qh5 Rfe8 2.h3 Bb7 3.Nd5 Bxd5
4.exd5 e4 5.Qg4+ Kh8 6.Bxe4 Rxe4
7.Qxe4 Rg8 (6.954.883) 488

13/11 0:24 +0.48 1.Qh5 Rfe8 2.Bc5 Qd7 3.Qh4 Rac8
4.Be3 Ba8 5.Bh6 Rxc3 6.Qg3+ (12.059.165) 495

14/15 0:31 +0.50 1.Qh5 Rfe8 2.Bc5 Qd7 3.Qh4 Rac8
4.Be3 Qe6 5.a4 Kh8 6.Nd5 Rg8 7.g3 Rg5
8.axb5 (15.567.310) 497

15/18 0:38 +0.35 1.Qh5 Rfe8 2.Qg4+ Kh8 3.Qh4 Rg8
4.Qxf6+ Rg7 5.g3 Qd7 6.Bh6 Rag8
7.Kf1 Qh3+ 8.Ke1 Bd7 9.Bxg7+ Rxg7 (19.290.731) 495

16/20 1:05 +0.19-- 1.Qh5 Rfe8 2.Qg4+ Kh8 3.Qh4 Rg8
4.Qxf6+ Rg7 5.g3 Qd7 6.Bh6 Rag8
7.Kf1 Qh3+ 8.Ke1 Qxh2 9.Qxc6 Qxg3+
10.Kd2 Rg6 (32.229.733) 490

16/16 1:31 +0.05 1.Qh5 Rfe8 2.Ne2 Bd7 3.Qh4 Qd8 4.Nc3 f5
5.Qg3+ Kh8 6.exf5 Qf6 7.Be4 Rg8
8.Qh3 Rac8 (44.987.104) 493

17/23 1:45 +0.06 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bd4 Qd6 6.Bxe4 h6 7.Qh4 Rxe4
8.Bxf6+ Kg8 9.Qxh6 Re1+ 10.Kf2 Re2+
11.Kxe2 Re8+ 12.Kf2 (52.473.715) 496

18/18 1:52 +0.08 1.Qh5 Rfe8 2.Qh4 Bb7 3.Bc5 Qd7 4.Nd5 Bxd5
5.exd5 e4 6.Qg3+ Kh8 7.Qf4 Kg8
8.Bxe4 Rxe4 9.Qxe4 Re8 (55.912.741) 497

19/16 1:59 +0.08 1.Qh5 Rfe8 2.Qh4 Bb7 3.Nd5 Bxd5
4.exd5 e4 5.Qg4+ Kh8 6.Bxe4 Rxe4
7.Qxe4 Qe5 8.Qxe5 fxe5 (59.747.941) 498

20/16 2:42 +0.01 1.Qh5 Rfe8 2.h3 Kh8 3.Qh6 Rg8
4.Qxf6+ Rg7 5.g4 Kg8 6.Nd5 Bxd5
7.exd5 e4 8.d6 Qd8 (81.187.182) 498

21/24 4:17 0.00 1.Qh5 Rfe8 2.h3 Kh8 3.Qh4 Rg8
4.Qxf6+ Rg7 5.Nd5 Bxd5 6.Bh6 Rag8
7.exd5 e4 8.Bxg7+ Rxg7 9.Bxe4 Qa7+
10.Kh2 Qe3 11.Qd8+ Rg8 12.Qf6+ Rg7 (127.068.075) 493

22/16 7:01 0.00 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bd4 Qd6 6.Qh4 Re6
7.Bxe4 Rxe4 8.Qxe4 Rg8 (209.136.770) 496

23/16 8:59 0.00 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bd4 Qd6 6.Qh4 Re6
7.Bxe4 Rxe4 8.Qxe4 Rg8 (265.016.402) 491

24/16 9:20 0.00 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bd4 Qd6 6.Qh4 Re6
7.Bxe4 Rxe4 8.Qxe4 Rg8 (274.838.833) 490

25/16 9:49 0.00 1.Qh5 Rfe8 2.Nd5 Bxd5 3.exd5 e4
4.Qg4+ Kh8 5.Bd4 Qd6 6.Qh4 Re6
7.Bxe4 Rxe4 8.Qxe4 Rg8 (288.791.773) 490

26/24 22:38 0.00 1.Qh5 Rfe8 2.Qh4 Bb7 3.a4 Qd8 4.Nd5 Bxd5
5.exd5 e4 6.Bxe4 Rxe4 7.Qxe4 Qd6
8.Qg4+ Kh8 9.Bd4 h6 10.axb5 axb5
11.Qf5 Kg7 12.Qg4+ Kh8 (657.951.223) 484

27/16 28:51 0.00 1.Qh5 Rfe8 2.Qh4 Bb7 3.a4 Qd8 4.Nd5 Bxd5
5.exd5 e4 6.Bxe4 Rxe4 7.Qxe4 Qd6
8.Qg4+ Kh8 (835.698.448) 482

28/16 41:59 0.00 1.Qh5 Rfe8 2.Qh4 Bb7 3.Nd5 Bxd5
4.exd5 e4 5.Qg4+ Kh8 6.Bd4 Qd6 7.Qh4 Re6
8.Bxe4 Rxe4 (1.221.019.358) 484

29/16 56:15 0.00 1.Qh5 Rfe8 2.Qh4 Bb7 3.Nd5 Bxd5
4.exd5 e4 5.Qg4+ Kh8 6.Bd4 Qd6 7.Qh4 Re6
8.Bxe4 Rxe4 {
[D]r6k/5p1p/p2q1p2/1p1P4/1P1Br2Q/P7/2P3PP/6K1 w - - 0 1} (1.641.042.593) 486

[Mike S.]

Not an avoid sac test specifically, but the best general avoid move test I know of is the Swiss Test by Walter Eigenmann:

http://glareanverlag.wordpress.com/category/swiss-test/

(download link near bottom of page)

It consits of 64 positions. Maybe you find at least some useful "avoid sac" positions among these.