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What do modern computer chess programs reveal about this opening?
The analysis below suggests that 8.c3 is playable but that white has other options, such as 8.d3, 8.a4.
9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6
White has 12.d4, 12.Re1, 12.d3, 12.g3 if he wants to press for an advantage, anything else is likely even at best.
The lower ply analysis immediately below suggests that white might have something here, more detailed analysis in sections A-E seems to confirm...
Stockfish_19100109_x64_modern
65/97 175:44:42 4,186,541,224k 6,617k +0.25 12.d3 Bd6 13.Re1 Bf5 14.Qf3 Bg6 15.Bxd5 cxd5 16.Bf4 d4 17.cxd4 Bb4 18.Nc3 Qxd4 19.Be3 Qd7 20.Red1 Rad8 21.h3 Rfe8 22.Bb6 Rc8 23.Nd5 Bd6 24.Bd4 Rcd8 25.Bc3 Re6 26.Re1 h6 27.Ba5 Rde8 28.Rxe6 fxe6 29.Nb6 Qc7 30.Nc4 Bh2+ 31.Kh1 Qf4 32.Nd2 Qxf3 33.Nxf3 Bf4 34.Bc3 Bxd3 35.Rd1 Be4 36.Rd7 e5 37.Rd6 a5 38.a3 a4 39.Nd2 Bxd2 40.Bxd2 Kf7 41.Kh2 Re6 42.Rxe6 Kxe6 43.Bc3 Bc6 44.Kg1 Kf7 45.Bxe5 Kg6
64/85 145:41:26 3,504,175,396k 6,681k +0.28 12.Re1 Bd6 13.d3 Bf5 14.Qf3 Bg6 15.Bxd5 cxd5 16.Bf4 d4 17.cxd4 Bb4 18.Nc3 Qxd4 19.Be3 Qd7 20.Red1 Rad8 21.Rac1 Rfe8 22.a3 Be7 23.d4 Bf8 24.d5 a5 25.Rd4 Rc8 26.d6 b4 27.axb4 axb4 28.Rxb4 Qxd6 29.Rb6 Qe5 30.Rd1 Rcd8 31.Rxd8 Rxd8 32.h4 Bh5 33.Qc6 Bd6 34.g3 f6 35.Rb5 Be8 36.Qc4+ Bf7 37.Qe4 Qxe4 38.Nxe4 Bc7 39.Rb4 Re8 40.Kg2 Be5 41.Bd4 Bd5 42.f3 Bxd4 43.Rxd4 Bc6 44.Kf2 Kf7 45.Ke3
64/91 148:29:34 3,590,767,010k 6,717k +0.13 12.d4 Bd6 13.Re1 Qh4 14.g3 Qh3 15.Qf3 Bg4 16.Qg2 Qh5 17.Be3 Rae8 18.Nd2 h6 19.a4 b4 20.Nc4 Bc7 21.cxb4 Nxb4 22.Bd2 Bh3 23.Qh1 Nd3 24.Rxe8 Rxe8 25.Bd1 Re2 26.Qe4 Rxe4 27.Bxh5 Rxd4 28.b3 Rd8 29.Rd1 Nc5 30.Ba5 Bxa5 31.Nxa5 Rb8 32.Rc1 Nd3 33.Rb1 Nc5 34.Nxc6 Rxb3 35.Rxb3 Nxb3 36.Bd1 Be6 37.Kf1 Nc5 38.Nd4 Bd5 39.a5 Kf8 40.Be2 Ke7 41.Nf5+ Kf6 42.Ne3 Be6 43.f4 Nb3 44.Bxa6 Nxa5 45.Bb5 Ke7 46.Ke1 Kd6 47.Kf2 Nc6 48.Bxc6 Kxc6
Conclusion: Sections A-E below suggest 12.d3 is best play with a small white advantage. This analysis must be taken as only one impression, and has even changed as time passes and greater search depths are reached.
Section A 12.d4
Section B 12.d3 this move emerges as best play...
Section C 12.Re1 Bd6
Section D 12.g3
Section E 12.other
Section F Anti-Marshall 8.other
Section A: 12.d4
This line likely continues 12...Bd6 13.Re1* Qh4 14.g3 Qh3 where the computer cannot now find an advantage for white
520 hours +0.00/75 15.Qe2 Bg4 16.Qf1 Qh5 17.Nd2 Rae8 18.f3 Rxe1 19.Qxe1 Bxf3 20.Nxf3 Qxf3 21.Bc2 c5 22.Qe4 Qh5 23.Kg2 cxd4 24.cxd4 Rd8 25.Bb3 Bc7 26.Qf3 Qxf3+ 27.Kxf3 Ne7 28.Bg5 Kf8 29.Rf1 f6 30.Ke4 Ke8 31.Be3 Bb6 32.g4 Rd6 33.Rf4 h6 34.a4 Nc6 35.Kd3 Kd7 36.axb5 axb5 37.h3 Ne5+ 38.Ke4 Nc4 39.Bxc4 bxc4
353 hours +0.00/74 15.Be3 Be6 16.Qf3 a5 17.Qg2 Qf5 18.Bd1 b4 19.c4 Nxe3 20.fxe3 Bxc4 21.Nd2 Bb5 22.Rc1 Rad8 23.Nb3 a4 24.Nc5 Bxc5 25.Rxc5 Rd5 26.Rc1 Qd7 27.b3 axb3 28.Bxb3 Rg5 29.Qf2 h5
- *13.Re4 transposes into a line from section E below, repeated here: 55/32 17:25:37 523,168,338k 8,339k 0.00 12.Re4 Bd6 13.d4 Bf5 14.Bxd5 cxd5 15.Re3 Qh4 16.g3 Bg4 17.f3 Bxg3 18.Qe2 Bf4 19.fxg4 f5 20.gxf5 Rxf5 21.Re8+ Rxe8 22.Qxe8+ Rf8 23.Qe6+ Kh8 24.Bxf4 Qxf4 25.Qe1 Qg4+ 26.Kh1 Qf3+ 27.Kg1
- *13.Re2 (13...Qh4, 13...Bg4, 13...Bc7 are the book moves, computer shows +0.00/67 13...Bg4 14.f3 Bf5 15.Bxd5 cxd5 16.Nd2 b4 17.cxb4 Bd3 18.Rf2 Qc7 19.g3 Bc2 20.Qf1 Rfc8 21.Nb3 Bxb4 22.Bf4 Qb6 23.Kg2 Bf8 24.Nc5 Qxb2 25.Qc1 Qxc1 26.Rxc1 Bg6)
Section B: 12.d3
...is this the best white can hope for in this line? More depth is needed to be sure... but 693 hours is a lot of time ...
693 hours +0.13/77 12...Bd6 13.Re1 Bf5 14.Qf3 Re8 15.Rxe8+ Qxe8 16.Nd2 Qe1+ 17.Nf1 Bg6 18.g3 Re8 19.Bd1 Qe6 20.Bd2 Qd7 21.Rc1 Nf6 22.Bc2 c5 23.a4 bxa4 24.Ra1 Qb5 25.Ra2 Re6 26.Ne3 Bxd3 27.c4 Bxc4 28.Bxa4 Be2 29.Bxb5 Bxf3 30.Bc4 Re8 31.Rxa6 Ne4 32.Ra7 Rf8 33.Bc1 Be5
566 hours +0.26/75 12...Bd6 13.Re1 Bf5 14.Qf3 Re8 15.Rxe8+ Qxe8 16.Nd2 Qe1+ 17.Nf1 Bg6 18.g3 Re8 19.Bd1 Qe6 20.Bd2 Qd7 21.Bb3 Nf6 22.Re1 Rxe1 23.Bxe1 c5 24.d4 cxd4 25.cxd4 Be4 26.Qd1 h5 27.f3 Bb7 28.Qd3 Bc7 29.Bf2 a5 30.Nd2 h4 31.Bd1 Bd5 32.Be2 Qc6 33.b3 Qe6 34.Qe3 Qxe3 35.Bxe3 Bc6 36.f4 hxg3 37.hxg3 Nd5 38.Bf3 Kf8
Section C 12.Re1 Bd6
After 12...Bd6 (best) white likely plays 13.d4 or 13.d3, transposing into Section A or B above. 13.g3 is playable here, with black not having the option for Bf6 as in section D below:
53/71 10:02:45 302,993,224k 8,378k 0.00 13.g3 Bf5 14.d4 Qd7 15.Be3 Rae8 16.Bxd5 cxd5 17.a4 b4 18.Qb3 Qb7 19.cxb4 Qxb4 20.Qxb4 Bxb4 21.Rc1 Rc8 22.f3 Rxc1+ 23.Bxc1 Rc8 24.Bd2 Bxb1 25.Bxb4 Rc1+ 26.Kf2 Rc2+ 27.Ke3 Rxb2 28.Bd6 Rb3+ 29.Kf4 f6 30.h4 h5 31.a5 Kf7 32.Bc5 Ke6 33.Bf8 g6 34.Bc5 Kf7 35.Bd6 Ke6 36.Bf8 Kf7 37.Bc5 Ke6
52/86 9:36:45 289,788,340k 8,374k -0.29 13.Bxd5 cxd5 14.d3 d4 15.Nd2 dxc3 16.bxc3 Qc7 17.Ne4 Bxh2+ 18.Kh1 Bb7 19.a4 Bd6 20.Nxd6 Qxd6 21.f3 Qg6 22.d4 Bd5 23.Bf4 Qc6 24.axb5 axb5 25.Qd3 h6 26.Bg3 Ra4 27.Rab1 Bc4 28.Qf5 Qa8 29.d5 Bxd5 30.Rxb5 Bc4 31.Rb4 Be6 32.Rxa4 Qxa4 33.Qe5 Qc2 34.Kg1 Ra8 35.Qe4 Ra2 36.Qxc2 Rxc2 37.Bf4 Rxc3 38.Rc1 Rxc1+ 39.Bxc1 Kh7 40.Bd2 f6 41.Kf2 Kg6 42.Ke3
52/76 9:36:45 289,788,340k 8,374k -0.49 13.Na3 Nf4 14.Qf3 Nd3 15.Re3 Ne5 16.Rxe5 Bxe5 17.d4 Bd6 18.Qxc6 Rb8 19.Qf3 Bb7 20.Qh5 g6 21.Qe2 Re8 22.Be3 Qg5 23.Qf1 Qf5 24.Rd1 Bd5 25.h3 Rbc8 26.Rc1 Bxa3 27.bxa3 Bc4 28.Qd1 Qd5 29.a4 Re6 30.Qc2 h6 31.Bf4 bxa4 32.Bxa4 Re2 33.Qd1 Kg7 34.Bc2 Rce8 35.Bb3 f6 36.Bxc4 Qxc4 37.Qb3 Re1+ 38.Rxe1 Rxe1+ 39.Kh2 Qxb3 40.axb3 g5 41.Be3
Section D 12.g3
64/86 149:39:07 3,627,039,020k 6,732k 0.00 12.g3 Bf6 13.Re1 c5 14.d4 cxd4 15.cxd4 Bb7 16.Nc3 Nxc3 17.bxc3 Qd7 18.Bb2 Rfe8 19.Rxe8+ Rxe8 20.d5 Qf5 21.a4 b4 22.Rc1 Rc8 23.Qe2 bxc3 24.Bxc3 h5 25.Qe3 Rxc3 26.Rxc3 Bxc3 27.Qxc3 Bxd5 28.Bxd5 Qxd5 29.Qc8+ Kh7 30.Qxa6 Qd1+ 31.Kg2 Qd5+
63/91 129:08:45 2,994,806,678k 6,441k 0.00 12.g3 Bf6 13.Re1 c5 14.d4 cxd4 15.cxd4 Bb7 16.Nc3 Nxc3 17.bxc3 Qd7 18.Bb2 Rfe8 19.Rxe8+ Rxe8 20.d5 Qf5 21.a4 b4 22.Rc1 Rc8 23.Qe2 bxc3 24.Bxc3 h5 25.Qe3 Bxc3 26.Rxc3 Rxc3 27.Qxc3 Bxd5 28.Bxd5 Qxd5 29.Qc8+ Kh7 30.Qxa6 Qd1+ 31.Kg2 Qd5+
62/77 99:59:11 2,322,396,570k 6,452k 0.00 12.g3 Bf6 13.Re1 c5 14.d4 cxd4 15.cxd4 Bb7 16.Nc3 Nxc3 17.bxc3 Qd7 18.Qd3 a5 19.Rb1 b4 20.cxb4 Bxd4 21.Bc2 Qh3 22.Qf1 Qg4 23.bxa5 Bc6 24.Qe2 Qh3 25.Qf1 Qg4
Section E 12.other
64/69 159:06:51 3,754,500,661k 6,555k 0.00 12.Bxd5 cxd5 13.d4 Bd6 14.Re3 Qh4 15.h3 Qf4 16.Rg3 Qf6 17.Re3
64/82 159:06:51 3,754,500,661k 6,555k 0.00 12.Re2 Bg4 13.f3 Bf5 14.d4 Qc7 15.Bxd5 cxd5 16.g3 Bd6 17.Nd2 b4 18.cxb4 Bc2 19.Qe1 Bxb4 20.Qf2 a5 21.Nb3 Bxb3 22.axb3 Qb6 23.Kg2 Rae8 24.Rxe8 Rxe8 25.Bd2 h6 26.Bc3 Qb5 27.Re1 Rxe1 28.Qxe1 Bxc3 29.Qxc3 Qe2+ 30.Kg1 g6 31.f4 Kh7 32.Qc7 Qe3+ 33.Kg2 Qe4+ 34.Kh3 Qe6+ 35.Kg2 Qe4+
55/32 17:25:37 523,168,338k 8,339k 0.00 12.Re4 Bd6 13.d4 Bf5 14.Bxd5 cxd5 15.Re3 Qh4 16.g3 Bg4 17.f3 Bxg3 18.Qe2 Bf4 19.fxg4 f5 20.gxf5 Rxf5 21.Re8+ Rxe8 22.Qxe8+ Rf8 23.Qe6+ Kh8 24.Bxf4 Qxf4 25.Qe1 Qg4+ 26.Kh1 Qf3+ 27.Kg1
Section F Anti-Marshall 8.other
...what else is there, other than 8.c3? 8.h3, 8.d3 and 8.a4 stand out. There are transposition possibilities.
stockfish_19100908_x64_modern
68/101 388:32:19 8,535,344,149k 6,102k +0.21 8.a4 b4 9.d3 d6 10.a5 Be6 11.Bxe6 fxe6 12.Nbd2 Qe8 13.c3 h6 14.d4 Rb8 15.Qe2 bxc3 16.bxc3 Rb5 17.dxe5 dxe5 18.h3 Bc5 19.Nc4 Qg6 20.Ra4 Nh5 21.Kh2 Rb3 22.Bd2 Rb5 23.Raa1 Nf6 24.Kh1 Rd8 25.Kg1 Be7 26.Ra2 Rdb8 27.Bc1 Qe8 28.Qc2 Bd6 29.Be3 Bc5 30.Bd2 Qg6 31.Bc1 Nd7 32.Ra4 Bd6 33.Be3 Bc5 34.Rd1 Qe8 35.Bd2 Bf8 36.Ra2 Bc5 37.Bc1 Nf6 38.Ra4 Qg6 39.Nb2 Bf8 40.Qe2 Bd6 41.Nd3 Rxa5 42.Rxa5 Nxa5 43.Qa2 Nc6
68/94 402:39:02 8,928,975,517k 6,160k +0.13 8.h3 d6 9.c3 Bb7 10.a4 h6 11.d3 Na5 12.Bc2 c5 13.axb5 axb5 14.d4 cxd4 15.cxd4 d5 16.Nxe5 dxe4 17.Nc3 Bb4 18.Re3 Nc4 19.Rxa8 Bxa8 20.Nxc4 bxc4 21.Nxe4 Bxe4 22.Bxe4 Bc5 23.Bf3 Bxd4 24.Re2 Qb6 25.Rd2 Rd8 26.Kf1 g5 27.Qa4 c3 28.bxc3 Bxc3 29.Qc6 Bd4 30.Qxb6 Bxb6 31.Rxd8+ Bxd8 32.Bb2 Kf8 33.Bc6 Ke7 34.Ba3+ Ke6 35.Bf8 h5 36.Ba3 Nd5 37.Bb7 Nf4 38.g3 Nd3 39.Ba6 Ne5 40.Ke2 Kd5 41.Bb7+ Ke6 42.Bc8+ Kd5 43.Ba6 Ng6 44.Bb7+ Ke6 45.Bc8+ Kd5 46.Bb2 Bb6 47.Ba6 Bc5 48.Bb7+ Ke6 49.Bc8+ Kd5 50.Ba6 Ke4 51.Bb7+ Kf5 52.Bc8+ Ke4 53.f3+ Kd5 54.Bb7+ Ke6
68/88 402:39:02 8,928,975,517k 6,160k +0.13 8.d3 d6 9.a4 Na5 10.Ba2 b4 11.c3 Rb8 12.Nbd2 c5 13.d4 bxc3 14.bxc3 cxd4 15.cxd4 Nc6 16.Ba3 exd4 17.h3 d3 18.Bc4 Nb4 19.Nd4 Bd7 20.N2f3 d5 21.exd5 Nfxd5 22.Bxd5 Nxd5 23.Bxe7 Nxe7 24.Qxd3 Ra8 25.Qa3 Re8 26.Qd6 Ng6 27.Nc6 Qc8 28.Rxe8+ Bxe8 29.Nfe5 Bxc6 30.Nxc6 Qe8 31.Rb1 Rc8 32.Rb8 Rxb8 33.Qxb8 Qxb8 34.Nxb8 a5 35.Nc6 Nf4 36.Nxa5 Ne2+ 37.Kf1 Nc3 38.Nc6 Nxa4 39.h4 Nc5 40.g4 f6 41.Nd4 Kf7 42.Nf5 g6 43.Nd4 Kg7 44.f3 Kf7 45.h5 gxh5 46.gxh5
58/88 77:32:55 2,001,987,246k 7,171k 0.00 8.a3 d6 9.Ba2 Re8 10.d3 h6 11.h3 Bf8 12.Nc3 Bd7 13.Nd5 Nxd5 14.Bxd5 Rb8 15.Bd2 Ne7 16.Ba2 Ng6 17.Nh2 Be6 18.Bxe6 Rxe6 19.Qg4 Be7 20.Nf1 c6 21.Ng3 Nh4 22.Qh5 Rg6 23.Kh1 Rf6 24.Re2 Rg6
...the machine thinks 8...d6 is best response to 8.c3, at this depth
68/88 402:39:02 8,928,975,517k 6,160k +0.13 8.c3 d6 9.h3 Bb7 10.a4 h6 11.d3 Na5 12.Bc2 c5 13.axb5 axb5 14.d4 cxd4 15.cxd4 d5 16.Nxe5 dxe4 17.Nc3 Bb4 18.Re3 Nc4 19.Rxa8 Bxa8 20.Nxc4 bxc4 21.Nxe4 Bxe4 22.Bxe4 Bc5 23.Bf3 Bxd4 24.Re2 Qb6 25.Qa4 Rc8 26.g3 g5 27.Kg2 Kg7 28.Rd2 Be5 29.Qc2 Qb3 30.Re2 Qxc2 31.Rxc2 c3 32.bxc3 Rxc3 33.Rxc3 Bxc3 34.Kf1 Bd4 35.Bc6 Kg6 36.Kg2 g4 37.hxg4 Nxg4 38.f3 Ne3+ 39.Kh3 f5 40.Be8+ Kg7 41.Kh4 Nc2 42.Bb5 Kg6 43.g4 fxg4 44.Kxg4 h5+ 45.Kh4 Be3 46.Bb2 Bf2+ 47.Kh3 Nd4 48.Be8+ Kf5 49.Bxh5 Kg5
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