This position is from analysis I did of Adams-Carlsen (Khanty-Mansiysk, 2010).
[D]r5rk/1pp1qpn1/p2p3p/3P4/2PQNP1b/1P3B1P/P6K/5RR1 w - - 0 31
The winning move is 31.Rg4!!
The main line goes 31.Rg4!! f5 32.Rg6 Kh7 33.Rfg1 Rae8 34.c5! and white wins.
Test position: Inviting the fork
Moderators: hgm, Rebel, chrisw
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Albert Silver
- Posts: 3019
- Joined: Wed Mar 08, 2006 9:57 pm
- Location: Rio de Janeiro, Brazil
Test position: Inviting the fork
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."
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zullil
- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Test position: Inviting the fork
Stockfish-1.9.1 (8 threads) concurs:
Code: Select all
Searching: r5rk/1pp1qpn1/p2p3p/3P4/2PQNP1b/1P3B1P/P6K/5RR1 w - -
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0
2 +1.62 00:00 638 Bh5 f6
3 +1.29 00:00 1311 Bh5 Rae8 Nc3
4 +0.53 00:00 2243 Bh5 Rae8 Nf2 Bf6
4 +1.09 00:00 2770 Nc3 f6 Qe4 f5 Qxe7 Bxe7
5 +0.61 00:00 4130 Nc3 Qf6 Qxf6 Bxf6 Ne4 Bd4
5 +1.13 00:00 13912 a4 f5 Rg6 Kh7 Rfg1 fxe4 Bxe4
5 +1.17 00:00 26907 a3 f5 Rg6 Kh7 Rfg1 fxe4 Bxe4
6 < +0.97 00:00 28154 a3 Rae8
6 +0.85 00:00 32071 a3 Rae8 c5 dxc5 Nxc5 Bf6
6 +1.05 00:00 37533 b4 a5 b5 Rae8 c5 dxc5 Nxc5
7 < +0.89 00:00 41294 b4 f6
7 > +1.21 00:00 44209 Rg4 f5 Rg6 Kh7 Rfg1 fxe4 Bxe4 Qf7 Rf6+
7 > +1.37 00:00 45096 Rg4 f5 Rg6 Kh7 Rfg1 fxe4 Bxe4 Qf7 Rf6+
7 +1.13 00:00 47961 Rg4 h5 Rgg1 f6 Ng3 Qd7 Ne4
8 < +0.97 00:00 53538 Rg4 h5 Rgg1 f6 Ng3 Qd7 Ne4 Nf5
8 < +0.81 00:00 70980 Rg4 h5 Rgg1 f6 Ng3 Qd7 Ne4 Qe7
8 +0.73 00:00 90306 Rg4 h5 Rg2 f6 Qd3 Nf5 Bxh5 Qh7 Qe2
9 +1.05 00:00 112869 Rg4 h5 Rg2 f6 Rfg1 Nf5 Rxg8+ Rxg8 Rxg8+ Kxg8 Qa7
Qg7 Qb8+ Kh7 Qxb7
10 +0.89 00:00 158469 Rg4 h5 Rg2 f6 Rfg1 Nf5 Rxg8+ Rxg8 Rxg8+ Kxg8 Qa7
Kh7 Bg2 Qg7 Qxb7 Bg3+ Nxg3 Qxg3+ Kg1
11 > +1.21 00:00 458825 Rg4 h5 Rxh4 Qxh4 Ng5 f5 Qf6 Qxf4+ Kh1
11 < +0.57 00:00 569631 Rg4 f5 Rg6 Kh7 Rfg1 Raf8 Nd2 Bg5 fxg5 Kxg6
11 +0.93 00:01 872053 Rg2 f6 Rfg1 Nf5 Rxg8+ Rxg8 Qa7 Rxg1 Kxg1 Kg7 Qxb7
Nd4 Kg2
12 < +0.81 00:01 906345 Rg2 f6 Rfg1 Nf5 Rxg8+ Rxg8 Qa7 Rxg1 Kxg1 Kg7 Qxb7
Nd4 Kg2 f5
12 < +0.69 00:01 1010K Rg2 f6 Rfg1 Nf5 Rxg8+ Rxg8 Qa7 Rxg1 Kxg1 Kg7 Qxb7
Nd4 Kg2 f5
12 > +1.05 00:02 1279K Rg2 f6 Qd3 Nf5 Bg4 Ng7 Nc3 f5 Bf3 Rae8 Rg6 Kh7
Rfg1 Qe3
12 < +0.44 00:02 1345K Rg2 f6 Qd3 f5 Nd2 Rae8 Qd4 Qe3 Rg6 Kh7
12 +0.65 00:02 1971K Qc3 f6 Ng3 Bxg3+ Rxg3 Nf5 Rgg1 Raf8 Re1 Qf7 Qd3
Qd7 Bg4
13 +0.61 00:03 3441K Qc3 Raf8 a3 Re8 Rg4 Kh7 Rfg1 Nf5 Kh1 h5 R4g2 Rxg2
Rxg2 Rg8 Re2 Kh6 Qa1
14 +0.65 00:03 4372K Qc3 Raf8 Rg2 f5 Ng3 Qf6 Qb4 Ne8 Qxb7 Qd4 Ne2 Qe3
Qxa6 Nf6 Qa5 Rxg2+ Kxg2 Rg8+ Kh1
15 < +0.57 00:03 4974K Qc3 Raf8 Rg2 f6 Ng3 Bxg3+ Rxg3 Nf5 Re1 Nxg3 Rxe7
Nf1+ Kh1 Ng3+ Kg1 Ne4+
15 > +0.73 00:03 5580K f5 f6 Bh1 Qe5+ Qxe5 dxe5 Rg6
15 > +0.81 00:03 5758K f5 f6 Bh1 Qe5+ Qxe5 dxe5 Rg6
15 > +0.97 00:04 6421K f5 f6 Bh1 Qe5+ Qxe5 dxe5 Rg6
15 +1.01 00:04 7647K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Qe5+ Qxe5 dxe5 Nc5
Nd6 Ne6 Rg8 g7+ Rxg7 Nxg7 Kxg7 c5 Nb5 d6 cxd6
Bxb7 dxc5 Bxa6
16 +1.17 00:04 8872K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Qe5+ Qxe5 dxe5 Nc5 b6
Ne6 Rc8 Be4 Nd6 Bf5 e4 Bg4 Rg8 Kg2 Rxg6 Nxc7
17 +1.05 00:04 10630K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Qe5+ Qxe5 dxe5 Nc5 b6
Ne6 Rc8 Be4 Nd6 Bf3 Nf5 Bg4 Ne3 Rf3 Nc2 Rd3 Kg8
Rd2
18 +1.01 00:05 12752K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Kg7 Rf4 Bg5 Nxg5 hxg5
Re4 Qf8 Bf3 Kxg6 Re6 Kg7 Bh5 Kh8 h4 gxh4 Qe3 Ng7
Qh6+ Kg8 Rxf6
19 > +1.13 00:05 16064K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Kg7 Rf4 Bg5 Nxg5 hxg5
Re4 Qf8 Re6 Kxg6 Bf3 Kg7 Bh5 Kh8 h4 gxh4 Qe3 Ng7
Qh6+ Kg8 Rxf6
19 > +1.25 00:05 18269K f5 Qe5+ Qxe5 dxe5 d6 Nxf5 dxc7 Ne3 Rc1 Rxg1 Kxg1
Rg8+ Kh1 f5 Nd6
19 +1.17 00:06 21918K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Kg7 Rf4 Bg5 Nxg5 hxg5
Re4 Qf8 Re6 Kxg6 h4 Kf7 hxg5 fxg5 Bg2 c5
20 < +0.97 00:06 24376K f5 f6 Bh1 Ne8 Rg6 Rxg6 fxg6 Kg7 Rf4 Be1 Nxf6 Nxf6
Re4 Qf8 Rxe1 Re8 Re6 Rxe6 dxe6 Qe7
20 < +0.77 00:07 32001K f5 f6 Bh1 Ne8 Rxg8+ Kxg8 Rg1+ Kf7 Rg4 Ng7 Qc3
Nxf5 Rf4 Kg6 Kg1 Qe5
20 +0.97 00:09 40053K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 Qh7 Rxg8+
Rxg8 Nxf6 Bxf6 Rxg8+ Kxg8 Be4 Qg7 Bxf5 Bh4 Qf3
Qb2+ Qg2+ Qxg2+ Kxg2 a5 Bc8 b6 Kf3 Kf7 Be6+ Kf6
a3 Be1 Ke4
21 +1.17 00:10 47746K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Kf8
a4 Qg6 Qd3 Qh6 Qe3 Kg8 Bd3 Qf6 Qf2
22 +1.21 00:12 63580K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Kf8
a4 Qg6 Qe3 Qf6 Kg2 Qb2 c5 Kg8 cxd6 cxd6 Qd3
23 < +1.05 00:15 93847K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Kf8
a4 Qg6 Qe3 Qf6 Kg2 Qb2 c5 Be7 c6 bxc6 dxc6 Qc2
23 < +0.89 00:17 112020K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 R1g2 Rae8 Re2 Qd8 Qc3+
f6 Rxg8+ Rxg8 Bg4 Ng7 Be6 Nxe6 dxe6 Qf8
23 +1.05 00:25 178155K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 h5 R4g2 Rxg2+ Rxg2
Rg8 Bxh5 Rxg2+ Kxg2 Ng7 Be2 f5 Ng3 Qf6 Qd2 Qa1
Bd1 Kg8 a4 Bf6 Bc2 Bd4 Bd3 Qg1+ Kf3 Kf8 Nxf5
24 +1.13 00:30 218792K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 h5 R4g2 Rxg2+ Rxg2
Rg8 Bxh5 Rxg2+ Kxg2 Nh6 Bf3 Kg8 Qd4 b6 Kh2 Nf5
Qc3 Kh7 Qd3 Kg8 Qf1 Qf8 Bg4 Nd4 Qd3 Qg7
25 +1.17 00:34 251117K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 h5 R4g2 Rxg2+ Rxg2
Rg8 Bxh5 Rxg2+ Kxg2 Nh6 Bf3 Kg8 Qd4 b6 Kh2 Nf5
Qc3 Kh7 Qd3 Kg8 Qf1 Nh6 Qg2+ Kf8 Qg1 Qd8 Qb1 Qe7
Qd3 f5 Ng3
26 < +1.09 00:54 424174K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Kh1 h5
26 < +1.01 00:58 453941K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Kh1 h5
26 +1.05 01:05 512622K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Qa1
Bd1 Bf6 a4 Kf7 Kg2 Qc3 Qxc3 Bxc3 h4
27 +1.05 01:14 585066K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Qa1
Bd1 Bf6 a4 Kf7 Kg2 Bh4 Qd3 Kg8 Ne2 Bf6 Kh2 Kf7
Qd2 Nh5 Bc2
28 < +0.97 01:21 649465K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Bxh5 Rxg1 Kxg1 Ng7 Bg4 f5
28 +0.97 01:30 719789K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Qa1
Bd1 Kf8 a4 Ke8 Kg2 Kd8 Bc2 Qf6 Qe3 Qg6 Bd1 Kc8
Bc2
29 > +1.05 01:40 814269K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 Rae8 Ng5 hxg5 Qxf5
f6 Bc2 Rg7 fxg5 Bxg5 h4 Qe2+ R1g2
29 +1.05 01:45 853547K Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 h5 R4g2 Rxg2+ Rxg2
Rg8 Bxh5 Rxg2+ Kxg2 Ng7 Be2 Kg8 b4 Ne8 a4 Ng7 b5
axb5 cxb5 b6 Qf3 f5 Ng3 Qf6 Bd3 Qa1 Bxf5 Qa2+ Kg1
Qxa4
30 < +0.93 02:13 1106M Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Bd1 h5 R4g2 Rxg2+ Rxg2
Rg8
30 +1.01 02:46 1393M Rg4 Kh7 Rfg1 Nf5 Qd3 Kh8 Qc3+ f6 Qd3 h5 Rxg8+
Rxg8 Rxg8+ Kxg8 Bxh5 Ng7 Be2 f5 Ng3 Qf6 Qd2 Kf7
Bd1 Qg6 Qc3 Qh6 Kg2 Ke7 Qe3+ Kd8 a4 Kc8 Bc2 Kb8
b4 Qg6
Nodes: 1423357861
Nodes/second: 8369788
Best move: Rg4
Ponder move: Kh7
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Will Singleton
- Posts: 128
- Joined: Thu Mar 09, 2006 5:14 pm
- Location: Los Angeles, CA
Re: Test position: Inviting the fork
1. Rg4
(1. f5 f6 2. Bh1 Ne8 (2... Nh5 3. Rg4 Rxg4 4. hxg4 Ng7 {about +1})
3. Rxg8+ Kxg8 4. Rf4 Bg5 5. Rg4 Kf7 {about +1})
1... f5 2. Rg6 Kh7 3. Rfg1 b6
(3... Rae8 4. c5! {about +2})
4. Nf6+ Bxf6 5. Rxf6 {about +1}
So, it appears that the moves Rg4 and f5 are about equivalent. Your mistake was 3...Rae8.
(1. f5 f6 2. Bh1 Ne8 (2... Nh5 3. Rg4 Rxg4 4. hxg4 Ng7 {about +1})
3. Rxg8+ Kxg8 4. Rf4 Bg5 5. Rg4 Kf7 {about +1})
1... f5 2. Rg6 Kh7 3. Rfg1 b6
(3... Rae8 4. c5! {about +2})
4. Nf6+ Bxf6 5. Rxf6 {about +1}
So, it appears that the moves Rg4 and f5 are about equivalent. Your mistake was 3...Rae8.
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Albert Silver
- Posts: 3019
- Joined: Wed Mar 08, 2006 9:57 pm
- Location: Rio de Janeiro, Brazil
Re: Test position: Inviting the fork
Actually, b6 holds the fort as far as I can tell, I tried to refute it, but could not, so good find. f5, which I analyzed of course, was rejected as it wasn't winning and the positions that ensue are defensible. The +1 by Rybka 4 is highly debatable, and is more a result of its overevaluation of rook endgames as a whole.Will Singleton wrote:1. Rg4
(1. f5 f6 2. Bh1 Ne8 (2... Nh5 3. Rg4 Rxg4 4. hxg4 Ng7 {about +1})
3. Rxg8+ Kxg8 4. Rf4 Bg5 5. Rg4 Kf7 {about +1})
1... f5 2. Rg6 Kh7 3. Rfg1 b6
(3... Rae8 4. c5! {about +2})
4. Nf6+ Bxf6 5. Rxf6 {about +1}
So, it appears that the moves Rg4 and f5 are about equivalent. Your mistake was 3...Rae8.
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."