Brilliant sacrifice (test position)

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muxecoid
Posts: 150
Joined: Sat Jan 30, 2010 10:54 am
Location: Israel

Brilliant sacrifice (test position)

Post by muxecoid »

Thanks to kingscrusher's instructive game videos I saw this pearl.

[D] rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - 0 18

Great, perfectly sound sacrifice. Even the best engines need long time to find it.


[Event "Hastings Masters"]
[Site "Hastings/UK"]
[Date "2011.01.05"]
[Round "9.1"]
[White "Sengupta, Deep"]
[Black "Edouard, Romain"]
[Result "1-0"]
[WhiteElo "2527"]
[BlackElo "2620"]
[ECO "B66"]
[EventDate "2011.??.??"]
[PlyCount "57"]
[TimeControl "40/6000+30:20/3000+30:900+30"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O
Nxd4 9.Qxd4 Be7 10.f4 b5 11.Bxf6 gxf6 12.e5 d5 13.Be2 Bb7 14.f5 fxe5 15.
Qxe5 Bf6 16.Qg3 Qb8 17.Qh3 d4 18.fxe6 Qf4+ 19.Kb1 dxc3 20.exf7+ Kf8 21.a3
h5 22.Rhf1 Qe5 23.Bd3 Qg5 24.Qd7 Bxg2 25.Rde1 Be7 26.Rf5 Qh4 27.Rfe5 Rd8
28.Qc7 Rxd3 29.cxd3 1-0
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Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Brilliant sacrifice (test position)

Post by Dann Corbit »

These are the positions from that game:

{snip nonsense}

I do not see the posted position in it.
What am I missing here?

Nevermind...
I converted the wrong pgn file
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Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Brilliant sacrifice (test position)

Post by Dann Corbit »

rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - bm fxe6;
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Mark
Posts: 216
Joined: Thu Mar 09, 2006 9:54 pm

Re: Brilliant sacrifice (test position)

Post by Mark »

muxecoid wrote:Thanks to kingscrusher's instructive game videos I saw this pearl.

[D] rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - 0 18

Great, perfectly sound sacrifice. Even the best engines need long time to find it.


[Event "Hastings Masters"]
[Site "Hastings/UK"]
[Date "2011.01.05"]
[Round "9.1"]
[White "Sengupta, Deep"]
[Black "Edouard, Romain"]
[Result "1-0"]
[WhiteElo "2527"]
[BlackElo "2620"]
[ECO "B66"]
[EventDate "2011.??.??"]
[PlyCount "57"]
[TimeControl "40/6000+30:20/3000+30:900+30"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O
Nxd4 9.Qxd4 Be7 10.f4 b5 11.Bxf6 gxf6 12.e5 d5 13.Be2 Bb7 14.f5 fxe5 15.
Qxe5 Bf6 16.Qg3 Qb8 17.Qh3 d4 18.fxe6 Qf4+ 19.Kb1 dxc3 20.exf7+ Kf8 21.a3
h5 22.Rhf1 Qe5 23.Bd3 Qg5 24.Qd7 Bxg2 25.Rde1 Be7 26.Rf5 Qh4 27.Rfe5 Rd8
28.Qc7 Rxd3 29.cxd3 1-0
If fxe6 is the solution, my engine finds it pretty fast, but not with a convincing score. From the number of nodes searched in the first ply, it looks like my qsearch is going crazy!

Code: Select all

depth     nodes    time eval  pc
----------------------------------------------------------------------------
   1      17606    0.02  -28 Qh3h6 
   2      47637    0.05  -32 Qh3h6 Qb8e5 
   3      67139    0.07 -152 Nc3b1 Qb8f4  e6f5 
   4     132053    0.14 -143 Nc3b1 Qb8f4  e6f5  c2c4 
   5     362715    0.41 -118  f5e6  d4c3  e6f7 Rd1d7 Be2h5 
   6     917970    1.03 -115  f5e6  d4c3  e6f7 Kf8e7  b2c3 Ke7f7 
   7    3892303    4.47 -112  f5e6 Qb8f4  d4c3  e6f7  b2c3 Kb1c1 Qh3e3 
   8   13565102   15.56 -108  f5e6  d4c3  e6f7  e6f7  d4c3 Qf4g5 Rh1e1  d4c3 
   9   53292197   62.57 -116  f5e6  d4c3  e6f7  b2c3 Qb8e5 Kf8f7 Be2h5 Rd8d7
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Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Brilliant sacrifice (test position)

Post by Dann Corbit »

muxecoid wrote:Thanks to kingscrusher's instructive game videos I saw this pearl.

[D] rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - 0 18

Great, perfectly sound sacrifice. Even the best engines need long time to find it.


[Event "Hastings Masters"]
[Site "Hastings/UK"]
[Date "2011.01.05"]
[Round "9.1"]
[White "Sengupta, Deep"]
[Black "Edouard, Romain"]
[Result "1-0"]
[WhiteElo "2527"]
[BlackElo "2620"]
[ECO "B66"]
[EventDate "2011.??.??"]
[PlyCount "57"]
[TimeControl "40/6000+30:20/3000+30:900+30"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O
Nxd4 9.Qxd4 Be7 10.f4 b5 11.Bxf6 gxf6 12.e5 d5 13.Be2 Bb7 14.f5 fxe5 15.
Qxe5 Bf6 16.Qg3 Qb8 17.Qh3 d4 18.fxe6 Qf4+ 19.Kb1 dxc3 20.exf7+ Kf8 21.a3
h5 22.Rhf1 Qe5 23.Bd3 Qg5 24.Qd7 Bxg2 25.Rde1 Be7 26.Rf5 Qh4 27.Rfe5 Rd8
28.Qc7 Rxd3 29.cxd3 1-0
The only engine to solve it within 10 minutes that I tried was Critter:

Code: Select all

Analysis of Q:\fxe6.epd   
03/30/2011 3:22:27 PM Level: 100 Seconds
Analyzing engine: Critter_1.01_64bit

 1 fxe6;                
    Searching move: f5xe6
    Best move (Critter_1.01_64bit): f5xe6
    Identical moves! Found in: 00:00
     2/2	00:00	         283	283,000	-0.19	Qh3-h6 Qb8-e5
     3/4	00:00	       1,147	573,500	-1.36	Qh3-h6 Qb8-e5 Nc3-b1 Qe5xf5
     3/5	00:00	       3,023	755,750	-0.91	Nc3-b1 Qb8-e5 Be2-f3 d4-d3 Nb1-c3 Qe5-f4+ Kc1-b1 Bb7xf3 g2xf3 d3xc2+ Kb1xc2 e6xf5
     4/6	00:00	       3,674	734,800	-0.91	Nc3-b1 Qb8-e5 Be2-f3 d4-d3 Nb1-c3 Qe5-f4+ Kc1-b1 Bb7xf3 g2xf3 d3xc2+ Kb1xc2 e6xf5
     5/7	00:00	       5,038	839,666	-0.91	Nc3-b1 Qb8-e5 Be2-f3 d4-d3 Nb1-c3 Qe5-f4+ Kc1-b1 Bb7xf3 g2xf3 d3xc2+ Kb1xc2 e6xf5
     6/12	00:00	      11,602	1,054,727	-0.91	Nc3-b1 Qb8-e5 Be2-f3 d4-d3 Nb1-c3 Qe5-f4+ Kc1-b1 Bb7xf3 g2xf3 d3xc2+ Kb1xc2 e6xf5
     7/12	00:00	      18,400	1,150,000	-0.91	Nc3-b1 Qb8-e5 Be2-f3 d4-d3 Nb1-c3 Qe5-f4+ Kc1-b1 Bb7xf3 g2xf3 d3xc2+ Kb1xc2 e6xf5
     7/16	00:00	      42,149	1,505,321	-0.35	f5xe6 d4xc3 e6xf7+ Ke8-f8 Rd1-d7 c3xb2+ Kc1-b1 Bb7-e4 Rh1-f1 Qb8-e5 Qh3-a3+ Bf6-e7
     8/16+	00:00	      49,976	1,612,129	-0.26	f5xe6 d4xc3 e6xf7+ Ke8-f8 Rd1-d7 c3xb2+ Kc1-b1 Bb7-e4 Rh1-f1 Qb8-e5 Qh3-a3+ Bf6-e7
     8/16+	00:00	      51,071	1,547,606	-0.18	f5xe6 d4xc3 e6xf7+ Ke8-f8 Rd1-d7 c3xb2+ Kc1-b1 Bb7-e4 Rh1-f1 Qb8-e5 Qh3-a3+ Bf6-e7
     8/16+	00:00	      54,601	1,560,028	+0.13	f5xe6 d4xc3 e6xf7+ Ke8-f8 Rd1-d7 c3xb2+ Kc1-b1 Bb7-e4 Rh1-f1 Qb8-e5 Qh3-a3+ Bf6-e7
     8/18	00:00	      72,799	1,775,585	-0.40	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7
     9/20+	00:00	      95,728	1,840,923	-0.32	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7
     9/22	00:00	     160,654	2,362,558	-0.40	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7 Ra8-b8
    10/33+	00:00	     436,297	3,231,829	-0.31	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7 Ra8-b8 Rd1-d7 Be1-d2
    10/33+	00:00	     473,322	3,241,931	-0.23	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7 Ra8-b8 Rd1-d7 Be1-d2
    10/33-	00:00	     965,722	3,461,369	-0.48	f5xe6 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qb8-e5 Rh1-e1 Bf6-g5+ Kc1-b1 Bg5-d2 Be2-f3 Bd2xe1 Bf3xb7 Ra8-b8 Rd1-d7 Be1-d2
    10/34	00:01	   1,595,692	3,373,556	+0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    11/34-	00:01	   1,992,280	3,513,721	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    11/34-	00:01	   2,232,436	3,583,364	-0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    11/34	00:01	   2,788,907	3,650,401	+0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    12/34	00:01	   3,107,891	3,722,025	+0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    13/34-	00:01	   4,346,388	3,603,970	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    13/34-	00:02	   5,579,399	3,829,374	-0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    13/44-	00:03	  10,394,662	4,123,229	-0.41	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8
    13/48+	00:03	  13,240,559	4,227,509	+0.16	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8 Qc1-e3 Rd8xd1+ Be2xd1
    13/48+	00:04	  15,040,058	4,152,418	+0.25	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 Qf4-b4 Qh3-h6+ Bf6-g7 Qh6-c1 h7-h5 Rd1-d7 Bb7-c6 a2-a3 Qb4-h4 Rd7-c7 Bc6xg2 Rh1-d1 Ra8-d8 Qc1-e3 Rd8xd1+ Be2xd1
    13/48	00:04	  18,311,544	4,228,993	+0.28	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-g5 Qh3-e6 Rh8-h6 Be2-f3 Bf6-e5 Qe6-d7 Bb7xf3 Rf1xf3 Rh6-f6 Qd7-d5 Ra8-a7 Rf3-g3
    14/48-	00:05	  19,377,157	4,189,655	+0.19	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-g5 Qh3-e6 Rh8-h6 Be2-f3 Bf6-e5 Qe6-d7 Bb7xf3 Rf1xf3 Rh6-f6 Qd7-d5 Ra8-a7 Rf3-g3
    14/48-	00:05	  19,713,664	4,175,739	+0.10	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-g5 Qh3-e6 Rh8-h6 Be2-f3 Bf6-e5 Qe6-d7 Bb7xf3 Rf1xf3 Rh6-f6 Qd7-d5 Ra8-a7 Rf3-g3
    14/48-	00:06	  22,657,379	4,005,193	-0.21	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-g5 Qh3-e6 Rh8-h6 Be2-f3 Bf6-e5 Qe6-d7 Bb7xf3 Rf1xf3 Rh6-f6 Qd7-d5 Ra8-a7 Rf3-g3
    14/48	00:06	  25,364,050	3,991,824	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    15/48-	00:07	  29,074,638	3,974,660	-0.08	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    15/48	00:08	  31,570,025	4,056,279	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    16/48	00:09	  39,589,679	4,259,244	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    17/48	00:14	  63,347,900	4,575,837	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    18/48	00:23	 104,124,503	4,610,338	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    19/48	00:54	 277,773,778	5,126,963	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    20/50	01:44	 554,363,023	5,338,884	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1-e1 Kf8-g7 Re1-e8 Rh6-h8 Re8-e6 Rh8-h6
    21/62	05:02	1,699,956,944	5,639,509	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1xf6 Rh6xf6 Qd3-h7 Rf6-f1 Qh7-h8+ Kf8-e7 Qh8-e5+ Ke7-f8
    22/63	09:05	3,044,550,010	5,584,270	 0.00	f5xe6 Qb8-f4+ Kc1-b1 d4xc3 e6xf7+ Ke8-f8 b2-b3 h7-h5 Rh1-f1 Qf4-e5 Rd1-e1 Qe5-e7 Kb1-a1 Bb7-e4 Be2-d3 Qe7-a3 Re1-b1 Be4xd3 Qh3xd3 Rh8-h6 Rf1xf6 Rh6xf6 Qd3-h7 Rf6-f1 Qh7-h8+ Kf8-e7 Qh8-e5+ Ke7-f8
   03/30/2011 3:53:05 PM, Time for this analysis: 00:10:00, Rated time: 00:00

1 of 1 matching moves
03/30/2011 3:53:06 PM, Total time: 12:30:39 AM
Rated time: 00:00 = 0 Seconds
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Brilliant sacrifice (test position)

Post by zullil »

Stockfish-2.0.1 (8 threads) gets it, but slowly:

Code: Select all

27     -0.28   04:10    1821M Nb1 Qe5 Bf3 Bxf3 Qxf3 O-O Nd2 Rac8 Qd3 Qxf5 Qxf5 
                              exf5 Nb3 Rc4 Rhe1 Rfc8 Re2 Bg5+ Kb1 Be3 g3 Kg7 
                              Rf1 Kf6 c3 Rg8 Kc2 Rd8 Rd1 Rcc8 
28  <  -0.36   04&#58;50    2131M Nb1 Qe5 Bf3 Bxf3 Qxf3 Rc8 fxe6 fxe6 Rde1 Bg5+ Nd2 
                              Be3 
28  <  -0.44   06&#58;20    2841M Nb1 Qe5 Bf3 Bxf3 Qxf3 O-O Nd2 Rac8 fxe6 Rxc2+ 
28  >  -0.20   08&#58;11    3733M fxe6 Qf4+ Kb1 dxc3 exf7+ 
28  >  -0.12   08&#58;29    3859M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bxg2 Qe6 
                              Kg7 Rd3 Be5 Bf1 Bxh2 Bxg2 Qxg2 f8=B+ Rhxf8 
28  >  +0.04   08&#58;50    4022M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bxg2 Qe6 
                              Kg7 Rd3 Be5 Bf1 Bxh2 Bxg2 Qxg2 f8=B+ Rhxf8 
28  >  +0.36   09&#58;25    4297M fxe6 dxc3 exf7+ Kf8 Qh6+ Bg7 Qb6 cxb2+ Kb1 Bxg2 
                              Qc5+ Kxf7 Rd7+ Kg6 Bh5+ Kf6 Bg4 
28  >  +1.01   11&#58;03    5082M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 
28     +1.05   13&#58;19    6184M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bc8 Qf3 
                              Ra7 Rd5 Bb7 Rxg5 Bxf3 Bxf3 Bxg5 Re8+ Kxf7 Rxh8 
                              Kg7 Rc8 cxb2 Kxb2 Kf6 c4 bxc4 Rxc4 Re7 Kc2 Be3 
                              Kd3 Bb6 Ra4 Rd7+ Kc3 Rc7+ Kb4 Ra7 Kc4 Ke5 
29     +1.01   16&#58;16    7627M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bc8 Qf3 
                              Ra7 Rd5 Bb7 Rxg5 Bxf3 Bxf3 Bxg5 Re8+ Kxf7 Rxh8 
                              Kg7 Rc8 cxb2 Kxb2 Kf6 c4 bxc4 Rxc4 Re7 Kc2 Re6 h4 
                              Be3 Be4 h5 Bf3 Kg6 Ra4 Bf2 Be4+ Kh6 Bd3 Rc6+ Kd2 
                              Rd6 
30     +1.09   24&#58;11   11571M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bc8 Qf3 
                              Ra7 Rd5 Bb7 Rxg5 Bxf3 Bxf3 Bxg5 Re8+ Kxf7 Rxh8 
                              Kg7 Rc8 cxb2 Kxb2 Kf6 c4 bxc4 Rxc4 Re7 Kc2 Re6 h4 
                              Be3 g4 Bf2 g5+ Kg7 Kd2 Re7 Bh5 Be1+ Kd3 a5 a4 Bg3 
                              Bf3 
31     +1.09   32&#58;59   15998M fxe6 Qf4+ Kb1 dxc3 exf7+ Kf8 a3 Qg5 Rhe1 Bc8 Qf3 
                              Ra7 Rd5 Bb7 Rxg5 Bxf3 Bxf3 Bxg5 Re8+ Kxf7 Rxh8 
                              Kg7 Rc8 cxb2 Kxb2 Kf6 c4 bxc4 Rxc4 Re7 Kc2 Re6 h4 
                              Be3 g4 Bf2 g5+ Kg7 Kd2 Re7 Bh5 Be1+ Kd3 a5 Be2 
                              Bg3 

Nodes&#58; 17109638002
Time &#40;ms&#41;&#58; 2111878
Nodes/second&#58; 8101622
Best move&#58; fxe6
Ponder move&#58; Qf4+
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User avatar
Mike S.
Posts: 1480
Joined: Thu Mar 09, 2006 5:33 am

Re: Brilliant sacrifice (test position)

Post by Mike S. »

Stockfish with alternative settings (some small adjustments) goes for fxe6 immediatly:

Analysis by Stockfish 2.0.1 JAx (P4/2.4 GHz, 128 MB hash):

18.fxe6 dxc3 19.exf7+ Kf8 20.Kb1 Qe5 21.Bh5 cxb2 22.Rd7
-/+ (-1.09) Depth: 6/8 00:00:00 16kN
-+ (-1.53) Depth: 7/11 00:00:00 33kN
18.Nb1 Qe5 19.Bh5 0-0 20.Qg4+ Kh8 21.Rdf1 Qd5
-/+ (-1.09) Depth: 7/11 00:00:00 53kN
-/+ (-1.17 --) Depth: 8/8 00:00:00 66kN
18.fxe6 Qf4+ 19.Kb1 dxc3 20.exf7+ Kf8 21.b3 Bc8 22.Qh5 Be6 23.Rhf1 Qg5 24.Qf3 Kg7 25.h4 Qe5 26.Rd3 Bxf7 27.Re3 Qd6 28.Rd3 Qe5
-/+ (-1.01 ++) Depth: 8/8 00:00:00 :mrgreen: 73kN
= (0.00) Depth: 17/22 00:01:08 19426kN

This was from within the PGN. I use these settings all the time, IOW not designed just for this position:

Code: Select all

&#91;OPTIONS&#93;
Check Extension &#40;non-PV nodes&#41;=2
Passed Pawn Extension &#40;non-PV nodes&#41;=1
Cross-checking it with Dan's EPD, default engine settings and empty hash, I found that indeed Stockfish doesn't find it so quickly:

Analysis by Stockfish 2.0.1 JA:

1.fxe6 dxc3 2.exf7+ Kf8 3.bxc3 Qf4+ 4.Kb1 Be4
-/+ (-1.09) Depth: 6/8 00:00:00 14kN
-+ (-1.57 --) Depth: 7/8 00:00:00 25kN
(...)
1.Nb1 Qf4+ 2.Nd2 e5 3.Bf3 Bxf3 4.Qxf3 Qxf3 5.Nxf3 Ke7 6.Rhe1 Kd6 7.c3 Kd5 8.Kc2 Rag8 9.g3 Rg4 10.cxd4 Rc8+ 11.Kd2 e4 12.Ne5 Bxe5 13.dxe5 Kxe5 14.Ke3 Kxf5
-/+ (-0.88 ++) Depth: 11/11 00:00:02 519kN
=/+ (-0.44) Depth: 19/28 00:02:25 38317kN

Default-Stockfish can be convinced by interactive analysis. Nevertheless, was the game continuation played correctly? Stockfish thinks that after 22.Rhf1 (SF. and e.g. Houdini recommend Rhe1), 22...Bxg2 would have resulted in big black advantage. Also, it looks like some engines will prefer 21.b3 over 21.a3.

Analysis by Critter 1.01 32-bit+GTB:

1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qf4+ 4.Kb1 Bxf3 5.gxf3 dxc2+ 6.Kxc2 exf5
-/+ (-0.91) Depth: 6/12 00:00:00 12kN
-/+ (-0.91) Depth: 7/12 00:00:01 19kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Bd3 Be5 8.Ka1 Qa3 9.Rb1 Qe7 10.Rfe1 Rh6 11.Rbd1 Qa3 12.Rb1
+/- (0.85) Depth: 7/16 00:00:01 58kN
= (0.12) Depth: 14/50 00:01:17 27688kN
Regards, Mike
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mhalstern
Posts: 484
Joined: Wed Nov 18, 2009 1:09 am

Re: Brilliant sacrifice (test position)

Post by mhalstern »

Zappa after an hour still likes Nb1. Sorry, I left the GUI before pasting the analysis. I have faith in Zappa. I'll give it more time when I don't need my pc.
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Albert Silver
Posts: 3019
Joined: Wed Mar 08, 2006 9:57 pm
Location: Rio de Janeiro, Brazil

Re: Brilliant sacrifice (test position)

Post by Albert Silver »

muxecoid wrote:Thanks to kingscrusher's instructive game videos I saw this pearl.

[D] rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - 0 18

Great, perfectly sound sacrifice. Even the best engines need long time to find it.
Critter 1.0 and Deep Junior 12 find it in zero seconds.
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."
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mhalstern
Posts: 484
Joined: Wed Nov 18, 2009 1:09 am

Re: Brilliant sacrifice (test position)

Post by mhalstern »

New game
rq2k2r/1b3p1p/p3pb2/1p3P2/3p4/2N4Q/PPP1B1PP/2KR3R w kq - 0 1

Analysis by Ivanhoe 52fUS-x64:

1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qf4+ 4.Kb1 Bxf3 5.Qxf3 Qxf3 6.gxf3 Bxc3 7.bxc3
-/+ (-1.03) Depth: 6 00:00:02 37kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.Rhf1 Qe5 5.Qd7 Bxg2
=/+ (-0.62) Depth: 6 00:00:02 110kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.Rhf1 Qe5 5.Qd7 Bxg2
=/+ (-0.62) Depth: 6 00:00:02 111kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.Rhf1 Qe5 5.Qd7 Bxg2
=/+ (-0.62) Depth: 7 00:00:02 113kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.Rhf1 Qe5 5.Qd7 Bxg2
=/+ (-0.62) Depth: 7 00:00:02 114kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.Rhf1 Qe5 5.Qd7 Bxg2
=/+ (-0.54 ++) Depth: 8 00:00:02 122kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.bxc3 Ra7 5.Rhf1 Bc8 6.Qe3 Rxf7
=/+ (-0.49) Depth: 8 00:00:02 127kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.bxc3 Ra7 5.Rhf1 Bc8 6.Qe3 Rxf7
=/+ (-0.49) Depth: 8 00:00:02 131kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.bxc3 Ra7 5.Rhf1 Bc8 6.Qe3 Rxf7
=/+ (-0.57 --) Depth: 9 00:00:02 180kN
1.fxe6 dxc3 2.exf7+ Kf8 3.Kb1 h5 4.bxc3 Ra7 5.Rhf1 Bc8 6.Qe3 Rxf7
=/+ (-0.65 --) Depth: 9 00:00:02 204kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.Bh5 0-0 4.Bxf7+ Kh8 5.Bg6 Qh4 6.Qxh4 Bxh4 7.Rd7 hxg6 8.Rxb7 cxb2 9.Kxb2 Kg8
=/+ (-0.68) Depth: 9 00:00:02 318kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.Bh5 0-0 4.Bxf7+ Kh8 5.Bg6 Qh4 6.Qxh4 Bxh4 7.Rd7 hxg6 8.Rxb7 cxb2 9.Kxb2 Kg8
=/+ (-0.68) Depth: 9 00:00:02 330kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.bxc3 Bc8 5.g4 Kxf7 6.Rhf1 Qe5 7.Qf3 Rb8 8.Rd5 Qe7 9.g5
=/+ (-0.69) Depth: 10 00:00:02 478kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.bxc3 Bc8 5.g4 Kxf7 6.Rhf1 Qe5 7.Qf3 Rb8 8.Rd5 Qe7 9.g5
=/+ (-0.69) Depth: 10 00:00:02 500kN
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.bxc3 Bc8 5.Qh5 Be6 6.Rhf1 Qg5 7.Qf3 Kxf7 8.Qb7+ Kg6 9.Rd6 Qe3
-/+ (-0.75) Depth: 11 00:00:02 668kN
1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qf4+ 4.Kb1 Bxf3 5.Qxf3 Qxf3 6.gxf3 Bxc3 7.bxc3
=/+ (-0.61 ++) Depth: 11 00:00:02 975kN
1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qf4+ 4.Kb1 Bxf3 5.Qxf3 Qxf3 6.gxf3 Bxc3 7.bxc3
=/+ (-0.53 ++) Depth: 11 00:00:02 1010kN
1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qf4+ 4.Kb1 Bxf3 5.Qxf3 Qxf3 6.gxf3 Bxc3 7.bxc3
=/+ (-0.41 ++) Depth: 11 00:00:02 1116kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qf4+ 4.Kb1 0-0-0 5.g3 Qf2 6.Rhe1 e3 7.Nc5 Kb8 8.Nxb7 Kxb7
=/+ (-0.33) Depth: 11 00:00:02 1365kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qf4+ 4.Kb1 0-0-0 5.g3 Qf2 6.Rhe1 e3 7.Nc5 Kb8 8.Nxb7 Kxb7
=/+ (-0.33) Depth: 11 00:00:02 1382kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qf4+ 4.Kb1 0-0-0 5.g3 Qf2 6.Rhe1 e3 7.Nc5 Kb8 8.Nxb7 Kxb7 9.Qh5
=/+ (-0.41 --) Depth: 12 00:00:02 1621kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qf4+ 4.Kb1 0-0-0 5.g3 Qf2 6.Rhe1 e3 7.Nc5 Kb8 8.Nxb7 Kxb7 9.Qh5
=/+ (-0.49 --) Depth: 12 00:00:02 1662kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 Rd8 5.g3 0-0 6.Qg4+ Kh8 7.Rhe1 Rc8
=/+ (-0.51) Depth: 12 00:00:02 1838kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 Rd8 5.g3 0-0 6.Qg4+ Kh8 7.Rhe1 Rc8
=/+ (-0.51) Depth: 12 00:00:02 1848kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 0-0-0 5.Na5 Kb8 6.Nxb7 Kxb7 7.Rhe1 Rc8 8.Qe3 dxe3 9.Rxd6
=/+ (-0.52) Depth: 13 00:00:02 2426kN
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 0-0-0 5.Na5 Kb8 6.Nxb7 Kxb7 7.Rhe1 Rc8 8.Qe3 dxe3 9.Rxd6
=/+ (-0.52) Depth: 13 00:00:02 2570kN, tb=1
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 0-0-0 5.Na5 Kb8 6.Nxb7 Kxb7 7.Rhe1 Rc8 8.Qe3 Qd5
=/+ (-0.44 ++) Depth: 14 00:00:02 3130kN, tb=1
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 0-0-0 5.Na5 Kb8 6.Nxb7 Kxb7 7.Qh6 Qe5 8.Qh5 Qd5
=/+ (-0.36 ++) Depth: 14 00:00:02 3899kN, tb=1
1.Nb1 e5 2.Nd2 e4 3.Nb3 Qd6 4.Kb1 0-0-0 5.Na5 Kb8 6.Nxb7 Kxb7 7.Qh6 Qe5 8.Qh5 Qd5
= (-0.24 ++) Depth: 14 00:00:02 4879kN, tb=1
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 Rc8 4.fxe6 0-0 5.exf7+ Rxf7 6.Nd2 Bg5 7.Qg4 Qc5 8.Kb1 Qxc2+ 9.Ka1 Qc5 10.Ne4
= (-0.21) Depth: 14 00:00:03 6116kN, tb=1
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 Rc8 4.fxe6 0-0 5.exf7+ Rxf7 6.Nd2 Bg5 7.Qg4 Qc5 8.Kb1 Qxc2+ 9.Ka1 Qc5 10.Ne4
= (-0.21) Depth: 14 00:00:03 6418kN, tb=1
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 Rc8 4.fxe6 0-0 5.exf7+ Rxf7 6.Nd2 Bg5 7.Qg4 Qc5 8.Kb1 Qxc2+ 9.Ka1 Qc5 10.Ne4
=/+ (-0.29 --) Depth: 15 00:00:04 13950kN, tb=12
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 Rc8 4.fxe6 0-0 5.exf7+ Rxf7 6.Nd2 Bg5 7.Qg4 Qc5 8.Kb1 Qxc2+ 9.Ka1 Qc5 10.Ne4
= (-0.13 ++) Depth: 15 00:00:04 15055kN, tb=12
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Bg5+ 5.Nd2 Be3 6.Qg4+ Qg7 7.Qxg7+ Kxg7 8.Kb1 e5 9.Nf3 Kf6 10.c3 Rfd8 11.cxd4 Bxd4 12.Nxd4 Rxd4 13.Rxd4 exd4
= (-0.13) Depth: 15 00:00:04 15996kN, tb=12
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Bg5+ 5.Nd2 Be3 6.Qg4+ Qg7 7.Qxg7+ Kxg7 8.Kb1 e5 9.Nf3 Kf6 10.c3 Rfd8 11.cxd4 Bxd4 12.Nxd4 Rxd4 13.Rxd4 exd4
= (-0.13) Depth: 15 00:00:04 15996kN, tb=12
1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qe3+ 4.Kb1 dxc2+ 5.Kxc2 Bxf3 6.Qxf3 Qxf3 7.gxf3 Rc8 8.Kb3 Bxc3 9.bxc3 Ke7 10.fxe6 fxe6 11.Rhg1 Rhg8 12.Rg3 h5 13.Kb4 Rgd8 14.Rxd8 Rxd8 15.Rg7+ Kf6
= (-0.15) Depth: 16 00:00:04 20140kN, tb=17
1.Nb1 Qe5 2.Bf3 d3 3.Nc3 Qe3+ 4.Kb1 dxc2+ 5.Kxc2 Bxf3 6.Qxf3 Qxf3 7.gxf3 Rc8 8.Kb3 Bxc3 9.bxc3 Ke7 10.fxe6 fxe6 11.Rhg1 Rhg8 12.Rg3 h5 13.Kb4 Rgd8 14.Rxd8 Rxd8 15.Rg7+ Kf6
= (-0.15) Depth: 16 00:00:04 21147kN, tb=17
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Qxf5 5.Qxf5 exf5 6.Rf1 Rfc8 7.Rxf5 Rc6 8.Rdf1 Kg7 9.Nd2 Re8 10.R5f4 d3 11.Rg4+ Kh6 12.c3 Bg5 13.Rd4
= (-0.13) Depth: 17 00:00:05 28911kN, tb=23
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Qxf5 5.Qxf5 exf5 6.Rf1 Rfc8 7.Rxf5 Rc6 8.Rdf1 Kg7 9.Nd2 Re8 10.R5f4 d3 11.Rg4+ Kh6 12.c3 Bg5 13.Rd4
= (-0.13) Depth: 17 00:00:05 31131kN, tb=24
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Qxf5 5.Qxf5 exf5 6.Rf1 Rfc8 7.Rxf5 Rc6 8.Rdf1 Kg7 9.Nd2 Re8 10.R5f4 d3 11.Rg4+ Kh6 12.c3 Bg5 13.Rd4
= (-0.13) Depth: 18 00:00:07 40958kN, tb=25
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Qxf5 5.Qxf5 exf5 6.Rf1 Rfc8 7.Rxf5 Rc6 8.Rdf1 Kg7 9.Nd2 Re8 10.R5f4 d3 11.Rg4+ Kh6 12.c3 Bg5 13.Rd4
= (-0.13) Depth: 18 00:00:07 46281kN, tb=39
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Rhe1 Qxf5 5.Qxf5 exf5 6.Rf1 Rfc8 7.Rxf5 Rc6 8.Rdf1 Kg7 9.Nd2 Re8 10.R5f4 d3 11.Rg4+ Kh6 12.c3 Bg5 13.Rd4
= (-0.05 ++) Depth: 19 00:00:11 81190kN, tb=70
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 exf5 10.Qg3+ Qxg3 11.hxg3 Rc8 12.Kc2 Kg7 13.Rf1 Kg6 14.Re1 Bxc3 15.bxc3 Kf6
= (-0.04) Depth: 19 00:00:13 97433kN, tb=72
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 exf5 10.Qg3+ Qxg3 11.hxg3 Rc8 12.Kc2 Kg7 13.Rf1 Kg6 14.Re1 Bxc3 15.bxc3 Kf6
= (-0.04) Depth: 19 00:00:14 105mN, tb=79
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 exf5 10.Qg3+ Qxg3 11.hxg3 Rc8 12.Kc2 Kg7 13.Rf1 Kg6 14.Re1 h5 15.Re3
= (-0.08) Depth: 20 00:00:17 135mN, tb=103
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 exf5 10.Qg3+ Qxg3 11.hxg3 Rc8 12.Kc2 Kg7 13.Rf1 Kg6 14.Re1 h5 15.Re3
= (-0.08) Depth: 20 00:00:19 158mN, tb=157
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 Qf4+ 10.Kb1 Bxc3 11.Qxc3 Qxf5+ 12.Qc2 Qe5 13.g4 Qf4 14.h3 Rd8 15.Rc1 Kg7 16.Qc7 Qe4+ 17.Ka1 Rd2 18.Qc3+ Qd4 19.Qxd4+ Rxd4
= (-0.05) Depth: 21 00:00:29 257mN, tb=409
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 Qf4+ 10.Kb1 Bxc3 11.Qxc3 Qxf5+ 12.Qc2 Qe5 13.g4 Qf4 14.h3 Rd8 15.Rc1 Kg7 16.Qc7 Qe4+ 17.Ka1 Rd2 18.Qc3+ Qd4 19.Qxd4+ Rxd4
= (-0.05) Depth: 21 00:00:35 310mN, tb=616
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 Qf4+ 10.Kb1 Bxc3 11.Qxc3 Qxf5+ 12.Qc2 Qe5 13.g4 Qd4 14.g5 Rb8 15.Re1 Qf4 16.Qg2 Kg7 17.b3 e5 18.Qd5 Qf5+ 19.Ka1
= (-0.13 --) Depth: 22 00:01:10 672mN, tb=1519
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 Rad8 8.Rxd3 Rxd3 9.Qxd3 Qf4+ 10.Kb1 Bxc3 11.Qxc3 Qxf5+ 12.Qc2 Qe5 13.g4 Qd4 14.g5 Rb8 15.Re1 Qf4 16.Qg2 Kg7 17.b3 e5 18.Qd5 Qf5+ 19.Ka1
= (-0.21 --) Depth: 22 00:01:29 866mN, tb=2088
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 d2+ 8.Kxd2 Qa5 9.fxe6 fxe6 10.Qg3+ Kh8 11.Rhf1 Rab8 12.Kc1 Rg8 13.Qh3 Bxc3 14.Qxc3+ Qxc3+ 15.bxc3 Rxg2 16.Rd2
= (-0.15) Depth: 22 00:01:37 948mN, tb=2197
1.Nb1 Qe5 2.Bf3 Bxf3 3.Qxf3 0-0 4.Nd2 d3 5.c3 b4 6.Ne4 bxc3 7.Nxc3 d2+ 8.Kxd2 Qa5 9.fxe6 fxe6 10.Qg3+ Kh8 11.Rhf1 Rab8 12.Kc1 Rg8 13.Qh3 Bxc3 14.Qxc3+ Qxc3+ 15.bxc3 Rxg2 16.Rd2
= (-0.15) Depth: 22 00:01:37 948mN, tb=2197
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.bxc3 Bc8 5.Qh5 Be6 6.g3 Qg5
= (-0.07 ++) Depth: 23 00:02:47 1640mN, tb=7158
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Rh6 11.Rxf6 Rxf6 12.Qh7 Rd8 13.Qg8+ Ke7 14.Re1+ Kd7 15.Rd1+ Kc6 16.Qe8+ Kb7 17.Rd7+ Rxd7 18.Qxd7+ Kb6 19.Qd8+ Kb7 20.Qd7+
= (0.00) Depth: 23 00:03:09 1872mN, tb=7937
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Rh6 11.Rxf6 Rxf6 12.Qh7 Rd8 13.Qg8+ Ke7 14.Re1+ Kd7 15.Rd1+ Kc6 16.Qe8+ Kb7 17.Rd7+ Rxd7 18.Qxd7+ Kb6 19.Qd8+ Kb7 20.Qd7+
= (0.00) Depth: 23 00:03:14 1917mN, tb=8237
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 24 00:03:49 2282mN, tb=10484
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 24 00:04:01 2403mN, tb=10960
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 25 00:05:43 3463mN, tb=31765
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 25 00:06:16 3788mN, tb=35578
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 26 00:08:40 5320mN, tb=53791
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.00) Depth: 26 00:09:55 6090mN, tb=62839
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.08 ++) Depth: 27 00:16:45 10438mN, tb=200422
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
= (0.16 ++) Depth: 27 00:19:38 12192mN, tb=244444
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
+/= (0.28 ++) Depth: 27 00:23:06 14310mN, tb=303842
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
+/= (0.46 ++) Depth: 27 00:28:14 17465mN, tb=413097
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.b3 h5 5.Rhf1 Qe5 6.Rde1 Qe7 7.Ka1 Be4 8.Bd3 Qa3 9.Rb1 Bxd3 10.Qxd3 Qe7 11.Qg6 Be5 12.Qf5 Rd8 13.Rbe1 Qa3 14.Rb1 Qe7
+/- (0.73 ++) Depth: 27 00:37:33 23075mN, tb=642831
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.a3 h5 5.Rhf1 Qe5 6.Rde1 Rd8 7.Bd3 Qg5 8.Re8+ Kg7 9.Qe6 Bd5 10.h4 Bxe6 11.hxg5 Rhxe8 12.fxe8Q Rxe8 13.gxf6+ Kf7 14.bxc3 Rg8 15.Rf2 Rg3 16.Kb2 Bd5 17.Be2 Rg5 18.Bf1 h4 19.c4 bxc4 20.Kc3 Rg4 21.Kb4 Rg5 22.c3
+/= (0.64) Depth: 27 00:41:36 25702mN, tb=900623
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.a3 h5 5.Rhf1 Qe5 6.Rde1 Rd8 7.Bd3 Qg5 8.Re8+ Kg7 9.Qe6 Bd5 10.h4 Bxe6 11.hxg5 Rhxe8 12.fxe8Q Rxe8 13.gxf6+ Kf7 14.bxc3 Rg8 15.Rf2 Rg3 16.Kb2 Bd5 17.Be2 Rg5 18.Bf1 h4 19.c4 bxc4 20.Kc3 Rg4 21.Kb4 Rg5 22.c3
+/= (0.64) Depth: 27 00:42:39 26363mN, tb=915199
1.fxe6 Qf4+ 2.Kb1 dxc3 3.exf7+ Kf8 4.a3 h5 5.Rhf1 Qe5 6.Rde1 Rd8 7.Bd3 Qg5 8.Re8+ Kg7 9.Qe6 Bd5 10.h4 Bxe6 11.hxg5 Rhxe8 12.fxe8Q Rxe8 13.gxf6+ Kf7 14.bxc3 Rg8 15.Be4 Rg5 16.Kb2 a5 17.Rf2 a4 18.Bb7 Re5 19.Rf4 Bd5 20.Bxd5+ Rxd5 21.Rf2 Re5 22.c4 bxc4 23.Kc3 Re4 24.Kb4 Re3 25.Kxa4
+/- (0.72 ++) Depth: 28 00:55:44 34747mN, tb=1697556
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