A little more B30 Sicilian
Posted: Tue Jun 04, 2019 2:33 am
In relation to Ed's post, Stockfish really does not think much of standard opening theory here. 3. d4 gets close to a negative eval, even when using no contempt in UCI options.
[d]r1bqkbnr/pp1ppppp/2n5/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq -
Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
29 3:13 +0.40 3.c3 Nf6 4.e5 Nd5 5.d4 d6 6.dxc5 dxc5
7.Bb5 Bf5 8.Nh4 Be6 9.Bxc6+ bxc6
10.O-O Nb6 11.Qc2 g6 12.Bf4 Nd5
13.Rd1 Qc7 14.Bg3 Bh6 15.Nd2 O-O
16.Ne4 (272.200.122) 1407
29 3:13 +0.23 3.Bb5 e6 4.O-O Nge7 5.d4 cxd4 6.Nxd4 Qb6
7.Nxc6 bxc6 8.Be2 Ng6 9.c4 Be7
10.Nc3 O-O 11.Rb1 Qc7 12.g3 d6 13.h4 Rd8
14.Be3 e5 15.h5 Nf8 16.h6 (272.200.122) 1407
29 3:13 +0.18 3.Nc3 d6 4.d4 cxd4 5.Nxd4 e5 6.Nb3 Nf6
7.Be3 Ng4 8.Bc4 Nxe3 9.fxe3 Be7
10.Qe2 O-O 11.O-O-O a6 12.Rhf1 Bd7
13.Qf3 Kh8 14.Qh5 g6 15.Qe2 Kg8
16.Kb1 (272.200.122) 1407
29 3:13 +0.09 3.h3 d6 4.Nc3 Nf6 5.Be2 g6 6.d4 cxd4
7.Nxd4 Bg7 8.Nf3 O-O 9.Bg5 h6 10.Be3 Be6
11.O-O d5 12.exd5 Nxd5 13.Nxd5 Bxd5
14.c3 g5 15.h4 gxh4 16.Nxh4 (272.200.122) 1407
29 3:13 +0.08 3.b3 e6 4.Bb2 d5 5.Bb5 Nf6 6.e5 Nd7
7.Bxc6 bxc6 8.d3 a5 9.a4 Rb8 10.Nbd2 Be7
11.O-O Qc7 12.c4 O-O 13.Re1 Ba6
14.Qc2 Rfd8 15.g3 Kh8 16.Kh1 (272.200.122) 1407
29 3:13 +0.02 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6 6.N1c3 a6
7.Na3 b5 8.Nd5 Nf6 9.Bd3 Be7
10.Nxf6+ Bxf6 11.O-O O-O 12.c3 Be6
13.Nc2 Ne7 14.a4 Qd7 15.axb5 axb5
16.Rxa8 (272.200.122) 1407
29 3:13 0.00 3.Bc4 e6 4.Nc3 Nf6 5.Bb5 Qc7 6.d3 d6
7.Bxc6+ Qxc6 8.O-O h6 9.a4 Be7
10.Bf4 Nh5 11.Be3 Nf6 12.e5 (272.200.122) 1407
29 3:13 0.00 3.a3 Nf6 4.Nc3 g6 5.d4 cxd4 6.Nxd4 Bg7
7.Nf3 d6 8.Be2 O-O 9.O-O Be6 10.Ng5 Bd7
11.h3 Rc8 12.Nf3 Be6 13.Ng5 (272.200.122) 1407
29 3:13 -0.13 3.Be2 Nf6 4.Nc3 e6 5.d4 d5 6.exd5 exd5
7.O-O Be6 8.Bg5 h6 9.Bxf6 Qxf6
10.dxc5 Rd8 11.Na4 Be7 12.Bb5 Bg4
13.h3 Bh5 14.c3 O-O 15.Re1 Rfe8
16.b4 (272.200.122) 1407
This is just the latest Stock from GitHub with a few minor changes so that ttPV nodes are not reduced so much by LMR. Stockfish does that but it only makes the reduction two ply less which is not much when going deeper. I just reduce to half LMR for PV nodes (and compensate with more LMR when in other nodes, I have to add). in Multi PV, there are more PV nodes (or ex PV nodes ) so it should pay off more. But of course this is not going to give Stockfish a positional evaluation. 3. c3 {!} is the opening of the future in B30.
After the more standard 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 {diagram below}
the eval was +0.19 for White, with no contempt either side. After the analysis of this position deeper in the line I switched back to the original pos from Ed and 3. d4 for a while was not in the top eight moves..
[d]r1bqkb1r/pp1ppppp/2n2n2/8/3NP3/2N5/PPP2PPP/R1BQKB1R b KQkq -
Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
40 109:10 +0.19 5...e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5
9.Bxf6 gxf6 10.Nd5 f5 11.Bd3 Be6
12.O-O Bxd5 13.exd5 Ne7 14.Nxb5 Bg7
15.Nc3 e4 16.Bc4 Ng6 17.Qh5 Qf6
18.Ne2 O-O (9.352.572.171) 1427
40 109:10 +0.23 5...e6 6.Bf4 d6 7.Ndb5 e5 8.Bg5 a6
9.Na3 b5 10.Bxf6 gxf6 11.Nd5 f5
12.Bd3 Be6 13.O-O Bxd5 14.exd5 Ne7
15.Nxb5 Bg7 16.Nc3 e4 17.Bc4 Ng6
18.Qh5 Qh4 (9.352.572.171) 1427
40 109:10 +0.26 5...d6 6.Be3 e5 7.Nb3 Ng4 8.Bc4 Nxe3
9.fxe3 Be7 10.Rf1 O-O 11.Qe2 Bg5
12.O-O-O a6 13.a4 Nd4 14.Nxd4 exd4
15.Rxd4 Bf6 16.Rdd1 Be5 17.Rf2 b5
18.Bd5 Ra7 (9.352.572.171) 1427
40 109:10 +0.57 5...h5 6.Bg5 a6 7.Be2 g6 8.Bxf6 exf6
9.f4 Bb4 10.Qd2 Qb6 11.a3 Qxd4
12.axb4 Qxd2+ 13.Kxd2 Nxb4 14.Ra4 Nc6
15.b4 Nd4 16.Bd3 Rb8 17.Nd5 d6
18.Ke3 Nc6 (9.352.572.171) 1427
40 109:10 +0.62 5...h6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bf4 Be6 9.Rd1+ Nd7 10.h4 g6 11.Ne2 h5
12.f3 Ke8 13.b3 Bh6 14.Bxh6 Rxh6
15.Nf4 Nc5 16.Kf2 a5 17.Be2 Bd7
18.Nd3 Nxd3+ (9.352.572.171) 1427
40 109:10 +0.64 5...Rb8 6.Bg5 Qa5 7.Bxf6 gxf6 8.Nb3 Qg5
9.g3 f5 10.f4 Qg6 11.exf5 Qxf5
12.Qd2 Bg7 13.O-O-O d6 14.Kb1 Qf6
15.h3 h5 16.Bd3 Kf8 17.Be4 Bd7
18.Nc5 Bf5 (9.352.572.171) 1427
40 109:10 +0.67 5...g6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bc4 Ke8 9.a4 Nd7 10.Be3 h5 11.Ke2 Ne5
12.Bb3 Ng4 13.Bd2 b6 14.f3 Ba6+
15.Ke1 Ne5 16.a5 Bh6 17.Bxh6 Rxh6
18.f4 Nd7 (9.352.572.171) 1427
40 109:10 +0.76 5...a6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bf4 Be6 9.a4 Ke8 10.a5 h5 11.Be2 g6
12.O-O Bh6 13.Bxh6 Rxh6 14.h4 Rh8
15.Rfd1 Rd8 16.f3 Nd7 17.Kf2 f6
18.Rd2 Ne5 (9.352.572.171) 1427
[d]r1bqkbnr/pp1ppppp/2n5/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq -
Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
29 3:13 +0.40 3.c3 Nf6 4.e5 Nd5 5.d4 d6 6.dxc5 dxc5
7.Bb5 Bf5 8.Nh4 Be6 9.Bxc6+ bxc6
10.O-O Nb6 11.Qc2 g6 12.Bf4 Nd5
13.Rd1 Qc7 14.Bg3 Bh6 15.Nd2 O-O
16.Ne4 (272.200.122) 1407
29 3:13 +0.23 3.Bb5 e6 4.O-O Nge7 5.d4 cxd4 6.Nxd4 Qb6
7.Nxc6 bxc6 8.Be2 Ng6 9.c4 Be7
10.Nc3 O-O 11.Rb1 Qc7 12.g3 d6 13.h4 Rd8
14.Be3 e5 15.h5 Nf8 16.h6 (272.200.122) 1407
29 3:13 +0.18 3.Nc3 d6 4.d4 cxd4 5.Nxd4 e5 6.Nb3 Nf6
7.Be3 Ng4 8.Bc4 Nxe3 9.fxe3 Be7
10.Qe2 O-O 11.O-O-O a6 12.Rhf1 Bd7
13.Qf3 Kh8 14.Qh5 g6 15.Qe2 Kg8
16.Kb1 (272.200.122) 1407
29 3:13 +0.09 3.h3 d6 4.Nc3 Nf6 5.Be2 g6 6.d4 cxd4
7.Nxd4 Bg7 8.Nf3 O-O 9.Bg5 h6 10.Be3 Be6
11.O-O d5 12.exd5 Nxd5 13.Nxd5 Bxd5
14.c3 g5 15.h4 gxh4 16.Nxh4 (272.200.122) 1407
29 3:13 +0.08 3.b3 e6 4.Bb2 d5 5.Bb5 Nf6 6.e5 Nd7
7.Bxc6 bxc6 8.d3 a5 9.a4 Rb8 10.Nbd2 Be7
11.O-O Qc7 12.c4 O-O 13.Re1 Ba6
14.Qc2 Rfd8 15.g3 Kh8 16.Kh1 (272.200.122) 1407
29 3:13 +0.02 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6 6.N1c3 a6
7.Na3 b5 8.Nd5 Nf6 9.Bd3 Be7
10.Nxf6+ Bxf6 11.O-O O-O 12.c3 Be6
13.Nc2 Ne7 14.a4 Qd7 15.axb5 axb5
16.Rxa8 (272.200.122) 1407
29 3:13 0.00 3.Bc4 e6 4.Nc3 Nf6 5.Bb5 Qc7 6.d3 d6
7.Bxc6+ Qxc6 8.O-O h6 9.a4 Be7
10.Bf4 Nh5 11.Be3 Nf6 12.e5 (272.200.122) 1407
29 3:13 0.00 3.a3 Nf6 4.Nc3 g6 5.d4 cxd4 6.Nxd4 Bg7
7.Nf3 d6 8.Be2 O-O 9.O-O Be6 10.Ng5 Bd7
11.h3 Rc8 12.Nf3 Be6 13.Ng5 (272.200.122) 1407
29 3:13 -0.13 3.Be2 Nf6 4.Nc3 e6 5.d4 d5 6.exd5 exd5
7.O-O Be6 8.Bg5 h6 9.Bxf6 Qxf6
10.dxc5 Rd8 11.Na4 Be7 12.Bb5 Bg4
13.h3 Bh5 14.c3 O-O 15.Re1 Rfe8
16.b4 (272.200.122) 1407
This is just the latest Stock from GitHub with a few minor changes so that ttPV nodes are not reduced so much by LMR. Stockfish does that but it only makes the reduction two ply less which is not much when going deeper. I just reduce to half LMR for PV nodes (and compensate with more LMR when in other nodes, I have to add). in Multi PV, there are more PV nodes (or ex PV nodes ) so it should pay off more. But of course this is not going to give Stockfish a positional evaluation. 3. c3 {!} is the opening of the future in B30.
After the more standard 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 {diagram below}
the eval was +0.19 for White, with no contempt either side. After the analysis of this position deeper in the line I switched back to the original pos from Ed and 3. d4 for a while was not in the top eight moves..
[d]r1bqkb1r/pp1ppppp/2n2n2/8/3NP3/2N5/PPP2PPP/R1BQKB1R b KQkq -
Engine: Kaissa IV NoContempt (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
40 109:10 +0.19 5...e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5
9.Bxf6 gxf6 10.Nd5 f5 11.Bd3 Be6
12.O-O Bxd5 13.exd5 Ne7 14.Nxb5 Bg7
15.Nc3 e4 16.Bc4 Ng6 17.Qh5 Qf6
18.Ne2 O-O (9.352.572.171) 1427
40 109:10 +0.23 5...e6 6.Bf4 d6 7.Ndb5 e5 8.Bg5 a6
9.Na3 b5 10.Bxf6 gxf6 11.Nd5 f5
12.Bd3 Be6 13.O-O Bxd5 14.exd5 Ne7
15.Nxb5 Bg7 16.Nc3 e4 17.Bc4 Ng6
18.Qh5 Qh4 (9.352.572.171) 1427
40 109:10 +0.26 5...d6 6.Be3 e5 7.Nb3 Ng4 8.Bc4 Nxe3
9.fxe3 Be7 10.Rf1 O-O 11.Qe2 Bg5
12.O-O-O a6 13.a4 Nd4 14.Nxd4 exd4
15.Rxd4 Bf6 16.Rdd1 Be5 17.Rf2 b5
18.Bd5 Ra7 (9.352.572.171) 1427
40 109:10 +0.57 5...h5 6.Bg5 a6 7.Be2 g6 8.Bxf6 exf6
9.f4 Bb4 10.Qd2 Qb6 11.a3 Qxd4
12.axb4 Qxd2+ 13.Kxd2 Nxb4 14.Ra4 Nc6
15.b4 Nd4 16.Bd3 Rb8 17.Nd5 d6
18.Ke3 Nc6 (9.352.572.171) 1427
40 109:10 +0.62 5...h6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bf4 Be6 9.Rd1+ Nd7 10.h4 g6 11.Ne2 h5
12.f3 Ke8 13.b3 Bh6 14.Bxh6 Rxh6
15.Nf4 Nc5 16.Kf2 a5 17.Be2 Bd7
18.Nd3 Nxd3+ (9.352.572.171) 1427
40 109:10 +0.64 5...Rb8 6.Bg5 Qa5 7.Bxf6 gxf6 8.Nb3 Qg5
9.g3 f5 10.f4 Qg6 11.exf5 Qxf5
12.Qd2 Bg7 13.O-O-O d6 14.Kb1 Qf6
15.h3 h5 16.Bd3 Kf8 17.Be4 Bd7
18.Nc5 Bf5 (9.352.572.171) 1427
40 109:10 +0.67 5...g6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bc4 Ke8 9.a4 Nd7 10.Be3 h5 11.Ke2 Ne5
12.Bb3 Ng4 13.Bd2 b6 14.f3 Ba6+
15.Ke1 Ne5 16.a5 Bh6 17.Bxh6 Rxh6
18.f4 Nd7 (9.352.572.171) 1427
40 109:10 +0.76 5...a6 6.Nxc6 dxc6 7.Qxd8+ Kxd8
8.Bf4 Be6 9.a4 Ke8 10.a5 h5 11.Be2 g6
12.O-O Bh6 13.Bxh6 Rxh6 14.h4 Rh8
15.Rfd1 Rd8 16.f3 Nd7 17.Kf2 f6
18.Rd2 Ne5 (9.352.572.171) 1427