Author: Dann Corbit
Date: 08:43:35 03/05/02
Go up one level in this thread
On March 04, 2002 at 17:43:29, Albert Silver wrote:
>The following position occurred in Spassky-Beliavsky, Reykjavik, 1988
>
>2b1qrk1/5p1p/pBn3p1/1p2p3/4P2N/bBP1Q3/P4PPP/3R2K1 w - -
>
>Spassky found a tremendous move 25.Nxg6!! and won the game. I don't think any
>engines will have much luck with it but feel free to try it. I've analyzed it in
>detail and can verify that it is the strongest move and correct, so as a further
>challenge, see if you can find the *strongest* continuation after the possible
>defense: 25...hxg6 26.Qh6 Be6!?
The original position, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3p1/1p2p3/4P2N/bBP1Q3/P4PPP/3R2K1 w - - acd 16; acn
1951295469; acs 3601; bm Nxg6; ce 92; pv Nf3 Kg7 c4 f6 Ba4 bxa4 Qxa3 Bg4 Qxa4
Nd4 Qa3 Bxf3 gxf3 Qd7 Qe3 Qa4;
The position after Nxf3, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3p1/1p2p3/4P3/bBP1QN2/P4PPP/3R2K1 b - - acd 16; acn
1983510617; acs 3602; c0 "After Nf3"; ce -102; pv Bg4 Bd5 Nb8 h3 Bxf3 Qxf3 Qe7
Be3 Kg7 c4 bxc4 Bxc4 Bc5 Bxc5 Qxc5 Bd5 Nc6 h4;
The position after Bd5, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3p1/1p1Bp3/4P2N/b1P1Q3/P4PPP/3R2K1 b - - acd 16; acn
2016237313; acs 3601; c0 "After Bd5"; ce -68; pv Ne7 Bb3 Kg7 Nf3 f6 c4 bxc4 Bxc4
Qa4 Qe2 Bb7 Nd2 Rc8 Be6 Rc6 Bd7;
The position after c4, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3p1/1p2p3/2P1P2N/bB2Q3/P4PPP/3R2K1 b - - acd 16; acn
1972651157; acs 3600; c0 "After c4"; ce -94; pv Nd4 Bxd4 exd4 Qxd4 Qe7 Nf3 Bc5
Qe5 Qa7 Rd2 Bb4 Rb2 Qc5 Qxc5 Bxc5 cxb5 axb5 Rd2;
The position after Nxg6, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3N1/1p2p3/4P3/bBP1Q3/P4PPP/3R2K1 b - - acd 18; acn
2080491105; acs 3601; c0 "After Nxg6"; ce -65; pv hxg6 Qh6 Be6 Rd3 f5 Rh3 Kf7
Qh7+ Kf6 Qh4+ Kg7 Bxe6 Qxe6 exf5 Qg8 Qh6+ Kf6 fxg6 Ke6 Rd3 Qh8 Qd2 Kf6;
The position after Qh6, analyzed for one hour by crafty:
[D]2b1qrk1/5p1p/pBn3pQ/1p2p3/4P2N/bBP5/P4PPP/3R2K1 b - - acd 16; acn 2057571994;
acs 3600; c0 "After Qh6"; ce -47; pv Be6 Rd3 Qc8 Bxe6 fxe6 Nf3 Be7 Ng5 Bxg5 Qxg5
Rf4 f3 Qf8 Be3 Rf7 Bb6 a5;
Here is the log output for the position after Nxg6:
PFGA: EPD record: 5
time surplus 0.00 time limit 60:00 (60:00)
nss depth time score variation (1)
7 0.28 -2.49 1. ... hxg6 2. Bd5 Qd7 3. Qh6 Qg4 4.
f3 Qd7
7-> 0.31 -2.49 1. ... hxg6 2. Bd5 Qd7 3. Qh6 Qg4 4.
f3 Qd7
8 0.87 -2.47 1. ... hxg6 2. Bd5 Bg4 3. Qg5 Be6 4.
Bc7 Be7 5. Qh6
8-> 0.97 -2.47 1. ... hxg6 2. Bd5 Bg4 3. Qg5 Be6 4.
Bc7 Be7 5. Qh6
9 3.07 -2.33 1. ... hxg6 2. c4 Qe7 3. cxb5 axb5
4. Qg3 Qf6 5. Bxf7+ Qxf7 6. Qxa3 Nd4
9-> 3.19 -2.33 1. ... hxg6 2. c4 Qe7 3. cxb5 axb5
4. Qg3 Qf6 5. Bxf7+ Qxf7 6. Qxa3 Nd4
10 8.07 -2.42 1. ... hxg6 2. Bd5 Bg4 3. f3 Be6 4.
c4 Bb2 5. cxb5 axb5 6. Bc5 Bd4
10-> 8.28 -2.42 1. ... hxg6 2. Bd5 Bg4 3. f3 Be6 4.
c4 Bb2 5. cxb5 axb5 6. Bc5 Bd4
11 15.63 -2.44 1. ... hxg6 2. Bd5 Bg4 3. Qg5 Be6 4.
Bc7 Bc5 5. Rd2 Qd7 6. Bxe5 Nxe5 7.
Qxe5
11-> 16.16 -2.44 1. ... hxg6 2. Bd5 Bg4 3. Qg5 Be6 4.
Bc7 Bc5 5. Rd2 Qd7 6. Bxe5 Nxe5 7.
Qxe5
12 39.96 -- 1. ... hxg6
12 54.39 0.00 1. ... hxg6 2. Qh6 Be6 3. Rd3 Ne7 4.
Bxe6 fxe6 5. Rh3 Kf7 6. Rf3+ Kg8 7.
Rh3
12-> 55.76 0.00 1. ... hxg6 2. Qh6 Be6 3. Rd3 Ne7 4.
Bxe6 fxe6 5. Rh3 Kf7 6. Rf3+ Kg8 7.
Rh3
13 1:45 -- 1. ... hxg6
13 2:15 1.10 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke7 7.
axb3 Qb8 8. Qe3
13-> 2:18 1.10 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke7 7.
axb3 Qb8 8. Qe3
14 2:48 1.08 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke6 7.
axb3 Rf6 8. Rg3 Qf7
14-> 2:56 1.08 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke6 7.
axb3 Rf6 8. Rg3 Qf7
15 3:37 ++ 1. ... hxg6!!
15 10:41 0.43 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. Rg3 Bxb3 6. Rxg6 Qe6 7.
exf5 Qc8 8. axb3 Rh8
15-> 11:01 0.43 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. Rg3 Bxb3 6. Rxg6 Qe6 7.
exf5 Qc8 8. axb3 Rh8
16 14:24 0.61 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke7 7.
axb3 Qd7 8. Qh7+ Ke6 9. Qh5 Qg7 10.
Rd3
16-> 14:56 0.61 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. exf5 Bxb3 6. fxg6+ Ke7 7.
axb3 Qd7 8. Qh7+ Ke6 9. Qh5 Qg7 10.
Rd3
17 23:06 0.58 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. Qh7+ Kf6 6. Qh4+ Kg7 7.
Bxe6 Qxe6 8. exf5 Qg8 9. Qh6+ Kf6 10.
fxg6 Ke7 11. Rg3 Qxa2 12. h4
17-> 24:08 0.58 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. Qh7+ Kf6 6. Qh4+ Kg7 7.
Bxe6 Qxe6 8. exf5 Qg8 9. Qh6+ Kf6 10.
fxg6 Ke7 11. Rg3 Qxa2 12. h4
18 59:06 0.65 1. ... hxg6 2. Qh6 Be6 3. Rd3 f5 4.
Rh3 Kf7 5. Qh7+ Kf6 6. Qh4+ Kg7 7.
Bxe6 Qxe6 8. exf5 Qg8 9. Qh6+ Kf6 10.
fxg6 Ke6 11. Rd3 Qh8 12. Qd2 Kf6
time=60:00 cpu=100% mat=1 n=2080491105 fh=93% nps=577k
ext-> chk=116100733 cap=4544837 pp=765479 1rep=11574784
mate=806207
predicted=0 nodes=2080491105 evals=0
endgame tablebase-> probes done=0 successful=0
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