Test Position: Rossolimo-Nestler, Venice 1954

[David Dahlem]

[D]r4rk1/2q1bppp/p1b2n2/1p2p3/1P2P3/P1NBB3/2P1QRPP/5RK1 w - - 0 1

Rxf6

Vitruvius 0.82a: Slow Machine 2 cores

16+ 00:03 6.781.157 2.428.000 +0.19 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Qc7d6 Qe2h5 Kg8h8 Be3c5 Qd6e6 Nd5c7 Qe6d7 Nc7xa8 Rf8xa8 Qh5h6 Qd7e6
16+ 00:03 7.452.845 2.449.000 +0.27 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Qc7d6 Qe2h5 Kg8h8 Be3c5 Qd6e6 Nd5c7 Qe6d7 Nc7xa8 Rf8xa8 Qh5h6 Qd7e6
16+ 00:04 8.166.219 2.458.000 +0.39 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Qc7d6 Qe2h5 Kg8h8 Be3c5 Qd6e6 Nd5c7 Qe6d7 Nc7xa8 Rf8xa8 Qh5h6 Qd7e6
16 00:04 9.578.470 2.476.000 +0.46 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Rf8d8 Qe2d3 Qc7g7 d5d6 Qg7g5 Bf5xh7+ Kg8g7 Bh7e4 Qg5c1+ Kg1f2 Qc1f4+ Qd3f3 Qf4h4+ Qf3g3+ Qh4xg3+ Kf2xg3 Ra8c8 Kg3g4 Kg7f7 Kg4f5
16 00:04 9.679.463 2.472.000 +0.46 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Rf8d8 Qe2d3 Qc7g7 d5d6 Qg7g5 Bf5xh7+ Kg8g7 Bh7e4 Qg5c1+ Kg1f2 Qc1f4+ Qd3f3 Qf4h4+ Qf3g3+ Qh4xg3+ Kf2xg3 Ra8c8 Kg3g4 Kg7f7 Kg4f5
17 00:06 13.432.838 2.540.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
17 00:06 13.698.692 2.538.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
18 00:07 17.864.611 2.596.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
18 00:08 18.333.050 2.588.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
19 00:09 22.521.180 2.634.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
19 00:09 23.556.199 2.635.000 +0.45 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Bf5e6+ Kg8h8 Bc5xf8 Ra8xf8 c2c4 b5xc4 Qe2xc4 Qg7g5 Qc4xa6 Qg5e3+ Kg1f1 Qe3f4+ Kf1e2 Qf4e4+ Ke2d1 Qe4xg2 b4b5 Qg2g1+ Kd1e2 Qg1xh2+ Ke2d3 Qh2g3+ Kd3c4 Qg3f4+ Kc4c5 Qf4d4+ Kc5c6 Qd4c4+ Kc6b6
20 00:15 40.479.783 2.708.000 +0.40 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Qe2d3 Ra8d8 d5d6 Kg8h8 Bc5b6 Rd8d7 Bf5e6 Rf8g8 g2g4 h7h5 Qd3d2 Rd7b7 Qd2f2 e5e4 Kg1g2
20 00:17 43.637.953 2.705.000 +0.40 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Qe2d3 Ra8d8 d5d6 Kg8h8 Bc5b6 Rd8d7 Bf5e6 Rf8g8 g2g4 h7h5 Qd3d2 Rd7b7 Qd2f2 e5e4 Kg1g2
21- 00:33 90.488.416 2.750.000 +0.32 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Nc3d5 Bc6xd5 e4xd5 f6f5 Bd3xf5 f7f6 Be3c5 Qc7g7 Qe2d3 Ra8d8 d5d6 Kg8h8 Bc5b6 Rd8d7 Bf5e6 Rf8g8 g2g4 h7h5 Qd3d2 Rd7b7 Qd2f2 e5e4 Kg1g2
21 00:38 104.250.719 2.760.000 +0.44 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5
21 00:38 104.261.918 2.759.000 +0.44 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5
22- 00:48 132.940.405 2.781.000 +0.36 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5
22- 00:58 162.318.920 2.798.000 +0.28 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5
22 01:02 173.506.258 2.797.000 +0.44 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5
23- 01:22 229.102.579 2.813.000 +0.36 Rf2xf6 Be7xf6 Rf1xf6 g7xf6 Qe2h5 Kg8h8 Nc3d5 Bc6xd5 Qh5h6 Rf8g8 Qh6xf6+ Rg8g7 Be3h6 Qc7a7+ Kg1f1 Ra8g8 e4xd5 Qa7d4 d5d6 Qd4d5 Bh6xg7+ Rg8xg7 g2g3 Qd5h1+ Kf1f2 Qh1xh2+ Kf2e3 Qh2xg3+ Ke3e4 Qg3e1+ Ke4d5 Qe1h1+ Kd5xe5 Qh1a1+ Ke5f5 Qa1h1 Kf5f4 Qh1e1 Bd3e4 h7h5 c2c3 Qe1d2+ Kf4f5

[zullil]

It might be interesting to have V. try some "avoid move" problems that involve exchange sacrifices. That is, how good is V. at avoiding bad sacs?

[zullil]

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

How do engines evaluate this?

[David Dahlem]

It might be interesting to have V. try some "avoid move" problems that involve exchange sacrifices. That is, how good is V. at avoiding bad sacs?

Don't know yet, but i'll test it when time permits.

EDIT: Do you know of a good "avoid sac" test suite?

[zullil]

EDIT: Do you know of a good "avoid sac" test suite?

No, I don't. But if such problems exist, I'm sure some here will know about them.

[David Dahlem]

It might be interesting to have V. try some "avoid move" problems that involve exchange sacrifices. That is, how good is V. at avoiding bad sacs?

I'm not a good player so how do i determine what is a "good sac" or a "bad sac"? Is there an engine that can answer this question?

[MikeGL]

[D] 2rq2k1/1p2pp2/p2p1nbp/6p1/4P1P1/2N1BP2/PPP2Q2/1K1R4 b - - 0 1

1. ... Rxc3 will give white the upperhand even if black is a pawn up.
am Rxc3

[zullil]

Apparently the game is from 1950 not 1954, and ended in a draw (perpetual check). I haven't studied the game, but is Rossolimo's double exchange sacrifice actually the best course of action here? An engine can be designed to play more exchange sacrifices, but unless those sacrifices are sound, the engine's overall performance will suffer.

Code: Select all

[Event "Venice"]
[Site "Venice"]
[Date "1950.??.??"]
[EventDate "1950.??.??"]
[Round "5"]
[Result "1/2-1/2"]
[White "Nicolas Rossolimo"]
[Black "Vincenzo Nestler"]
[ECO "B85"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "84"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 a6 7.O-O
Qc7 8.f4 Nc6 9.Be3 Bd7 10.Qe1 b5 11.a3 Nxd4 12.Bxd4 Bc6 13.Bd3
Qb7 14.Qe2 Nd7 15.b4 e5 16.fxe5 dxe5 17.Be3 Nf6 18.Rf5 Qc7
19.Raf1 Be7 20.R5f2 O-O 21.Rxf6 Bxf6 22.Rxf6 gxf6 23.Nd5 Bxd5
24.Qg4+ Kh8 25.Qf5 Rg8 26.Qxf6+ Rg7 27.Bh6 Rag8 28.exd5 Qc3
29.Kf1 Qd4 30.d6 Qd5 31.Bf5 Qxg2+ 32.Ke1 Qg1+ 33.Kd2 Qf2+
34.Kc1 Qg1+ 35.Kb2 Qd4+ 36.Kb1 Qd1+ 37.Kb2 Qd4+ 38.Ka2 Qd5+
39.Ka1 Qd1+ 40.Ka2 Qd5+ 41.Kb1 Qd1+ 42.Kb2 Qd4+ 1/2-1/2

[Sorgenkind]

Hi!

Zappa Mexico II is successful on 48 core Magny-Cours:

1. Be3-g5 Nf6-e8 2. Bg5-c1 Ne8-f6 3. Bc1-g5
= (0.00) Depth: 21/61 00:02:38.64 3806762kN (23995 KN/s, 8317618 splits, 428426 aborts)
1. Be3-g5 Nf6-e8 2. Bg5-c1 Ne8-f6 3. Bc1-g5
= (0.00) Depth: 21/61 00:03:55.23 5890231kN (25040 KN/s, 10829281 splits, 553709 aborts)
1. Be3-g5 Nf6-e8 2. Bg5-c1 Ne8-f6 3. Bc1-g5
= (0.00) Depth: 22/63 00:04:50.42 7520328kN (25894 KN/s, 11893587 splits, 608424 aborts)
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
= (0.17) Depth: 22/63 00:07:03.66 11168257kN (26361 KN/s, 17285615 splits, 866045 aborts)
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
= (0.17) Depth: 22/63 00:07:15.52 11424633kN (26232 KN/s, 18155654 splits, 901534 aborts)
1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Rf8-e8 4. Nc3-d5 Bc6xd5 5. e4xd5 e5-e4 6. Qh5-g4 Kg8-h8 7. Be3-d4 Re8-e5 8. Bd3xe4 Qc7-d6 9. Qg4-f4 Kh8-g8 10. Qf4-g3 Kg8-h8 11. Bd4xe5 f6xe5
= (0.11) Depth: 23/65 00:07:38.75 12209097kN (26614 KN/s, 19177379 splits, 937393 aborts)
1. Rf2xf6 Be7xf6 2. Rf1xf6 g7xf6 3. Qe2-h5 Rf8-e8 4. Nc3-d5 Bc6xd5 5. e4xd5 e5-e4 6. Qh5-g4 Kg8-h8 7. Be3-d4 Re8-e5 8. Bd3xe4 Qc7-d6 9. Qg4-f4 Kh8-g8 10. Qf4-g3 Kg8-h8 11. Bd4xe5 f6xe5
= (0.11) Depth: 23/65 00:09:04.74 14604350kN (26809 KN/s, 22611254 splits, 1094306 aborts)
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-g7 8. d6-d7 Rf8-g8 9. Qh5-f3 a6-a5 10. Bf5-e6 Rg8-b8 11. b4xa5 Ra8xa5
= (0.19) Depth: 24/67 00:09:57.67 16302202kN (27276 KN/s, 24501076 splits, 1173152 aborts)
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-g7 8. d6-d7 Rf8-g8 9. Qh5-f3 a6-a5 10. Bf5-e6 Rg8-b8 11. b4xa5 Ra8xa5
= (0.19) Depth: 24/67 00:13:28.66 22157606kN (27400 KN/s, 31616611 splits, 1508484 aborts)
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 00:15:18.74 25852750kN (28139 KN/s, 33826985 splits, 1607907 aborts)

Score is rising, I'll let it analyze a little longer...

Best regards,
Steffen

[zullil]

What does Zappa say about this?

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