Test Position: 1.Rxg4!

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acase
Posts: 994
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Test Position: 1.Rxg4!

Post by acase »

This is one of those "locked pawn" positions that are notorious for giving engines a hard time. This was based on a game between Bent Larsen (white) and Eugenio Torre (black) after black's 45th move. The only thing I added was a black pawn on c7 so that the position would have only one solution, otherwise the boring and mundane 1.Ng3 (which is the inferior preferred move of most engines) would also win after black's 45th move in the Larsen vs Torre game.

This one probably will not be solved by most engines, so you might not want to let your engine think too long on it, instead (presumably after you give up :wink: ) just manually make the moves while your engine is analysing and watch the eval go up. The main line 1.Rxg4 hxg4 2.Ke3

[d] 5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w --



here is the game it is based on:

[Event "Brussels"]
[Site "Brussels"]
[Date "1987.04.11"]
[Round "2"]
[White "Larsen, Bent"]
[Black "Torre, Eugenio"]
[Result "1-0"]
[ECO "C24"]
[WhiteElo "2565"]
[BlackElo "2540"]
[PlyCount "111"]
[EventDate "1987.04.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "BEL"]
[EventCategory "14"]
[Source "ChessBase"]
[SourceDate "2004.01.01"]

1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Nf3 Be7 5. O-O d6 6. Re1 O-O 7. Nbd2 Nbd7 8. a3
h6 9. Ba2 Re8 10. Nf1 Nf8 11. Ng3 Be6 12. Bxe6 Nxe6 13. d4 Qc7 14. c4 Nh7 15.
d5 Neg5 16. Nf5 Nxf3+ 17. Qxf3 Kh8 18. Be3 c5 19. Rac1 Bg5 20. h4 Bxe3 21. Rxe3
Rac8 22. b4 Qd8 23. Qg3 Rg8 24. f4 f6 25. b5 Qd7 26. fxe5 fxe5 27. Qg6 Rcd8 28.
Rg3 Nf8 29. Qh5 Nh7 30. Re1 Rdf8 31. Rg6 Rf6 32. Rxf6 Nxf6 33. Qg6 Rf8 34. g4
Ne8 35. g5 Qf7 36. Qxf7 Rxf7 37. g6 Rd7 38. Rf1 Kg8 39. a4 h5 40. Kf2 Nf6 41.
Ke3 Kf8 42. a5 Rd8 43. Kd3 Rd7 44. a6 b6 45. Rg1 Ng4 46. Rxg4 hxg4 47. Ke3 Rd8
48. Kf2 Kg8 49. Kg3 Rd7 50. Kxg4 Kf8 51. Kg5 Kg8 52. h5 Kh8 53. h6 gxh6+ 54.
Nxh6 Kg7 55. Nf5+ Kf8 56. Kf6 1-0
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GARGAMEL
Posts: 111
Joined: Tue Dec 29, 2009 9:55 am
Location: AUSTRIA

Re: Test Position: 1.Rxg4!

Post by GARGAMEL »

hello Andrew

here are the analyses from IvanHoe 9.65b x64

Larsen,B - Torre,E, Brussels (2) (Analyse), Txg4
5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w - - 0 1


1.Tf1 Sh2 2.Tf2 Sg4 3.Tf1
= (0.00) Tiefe: 6 00:00:00 2kN
= (0.00) Tiefe: 10 00:00:00 9kN
1.Sg3 Sf6 2.Tf1 Ke7 3.Sf5+ Kf8 4.Tf3 Td8 5.Sh6 Te8 6.Sf7 Kg8 7.Sg5 Tc8 8.Se6 Kh8 9.Tf2 Kg8 10.Tf1 Kh8 11.Tf5 Kg8 12.Tg5 Kh8 13.Tg3 Kg8 14.Tg2 Kh8 15.Tg1 Sg4 16.Tg3 Sf2+ 17.Ke3 Sg4+ 18.Ke2 Kg8 19.Tg1 Kh8 20.Tf1 Sf6 21.Tf5 Kg8 22.Kf3 Kh8 23.Ke3 Sg4+ 24.Kd2 Sf6 25.Kd3
= (0.08) Tiefe: 10 00:00:00 14kN
= (0.08) Tiefe: 36 00:02:33 820mN
1.Txg4!! hxg4 2.Ke3 Td8 3.Kf2 g3+ 4.Kxg3 Kg8 5.h5 Tf8 6.Kg4 Td8 7.Se7+ Kf8 8.Sf5 Td7 9.h6 gxh6 10.Kh5 Ke8 11.Kxh6 Td8 12.Kg5
= (0.16) Tiefe: 36 00:03:34 1104mN
+/= (0.54) Tiefe: 36 00:05:54 1626mN

regards: Anton
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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: 1.Rxg4!

Post by zullil »

acase wrote:This is one of those "locked pawn" positions that are notorious for giving engines a hard time.

[d] 5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w --
Stockfish-1.6.3 (8 threads) finds Rxg4, but it takes 30 minutes at 9000000 nps:

Code: Select all

Searching: 5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w - -
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     +0.24   00:01      349 Rf1 Rd8 
 3     +0.12   00:01      669 Rf1 Ke8 Kc3 
 4     +0.16   00:01      970 Rf1 Ke8 Kc3 Nf6 
 5     -0.04   00:01     1786 Rf1 Nf6 Ke3 Rd8 Kd3 
 6     +0.00   00:01     3877 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
 7     +0.00   00:01     5717 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
 8     +0.00   00:01     8059 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
 9     +0.00   00:01    10558 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
10     +0.00   00:01    15552 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
11     +0.00   00:01    24963 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
12     +0.00   00:01    37915 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
13     +0.00   00:01    58510 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
14     +0.00   00:01    94309 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
15     +0.00   00:01   144810 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
16     +0.00   00:01   231983 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
17     +0.00   00:01   345795 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
18     +0.00   00:01   540114 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
19     +0.00   00:01   970821 Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
20     +0.00   00:01    1681k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
21     +0.00   00:01    2411k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
22     +0.00   00:02    3718k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
23     +0.00   00:02    5887k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
24     +0.00   00:02    9411k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
25     +0.00   00:03   14524k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
26     +0.00   00:04   21576k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
27     +0.00   00:06   32207k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
28     +0.00   00:08   48447k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
29     +0.00   00:11   73205k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
30     +0.00   00:16  113604k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
31     +0.00   00:23  171978k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
32     +0.00   00:35  274986k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
33     +0.00   00:53  437283k Rf1 Nf6 Ke3 Rd8 Kd3 Rd7 
34  >  +0.20   02:28    1341M Rf1 Nh2 Rg1 Nf3 Rg3 Nd4 Rg5 Nf3 Rxh5 
35     +0.04   03:47    2091M Rf1 Nh2 Rg1 Ng4 Ng3 Nf6 Rf1 Ke7 Rf3 Rd8 Nf5+ Kf8 
                              Nh6 Ke7 Nf7 Rf8 Ng5 Nd7 Rg3 Rf6 Ne6 Rxe6 dxe6 
                              Kxe6 Rf3 Nf6 Rf1 Ke7 Rf5 Ke6 Rf2 Ke7 Rf1 Ke6 Rf5 
                              Ke7 Rf2 Ke6 Rd2 Ng4 Re2 Nf6 
36     +0.04   07:48    4264M Rf1 Nh2 Rg1 Ng4 Ng3 Nf6 Rf1 Ke7 Rf3 Rd8 Nf5+ Kf8 
                              Nh6 Ke7 Nf7 Rf8 Ng5 Nd7 Rg3 Rf6 Ne6 Rxe6 dxe6 
                              Kxe6 Rf3 Nf6 Rf1 Ke7 Rf5 Ke6 Rf2 Ke7 Rf1 Ke6 Rf5 
                              Ke7 Rf2 Ke6 Rd2 Ng4 Re2 Nf6 
36     +0.28   11:05    6059M Ng3 Nf6 Rf1 Ke7 Nf5+ Kf8 Ne3 Rd8 Rg1 Ra8 Rg2 Rd8 
                              Rg5 Ra8 Nf5 Rd8 Ke3 Kg8 Ng3 Ng4+ Kf3 Rf8+ Nf5 Nf6 
                              Ke2 Rd8 Ng3 Rf8 Rf5 Rd8 Nxh5 Nxh5 Rxh5 Rf8 Rh7 
                              Rf4 Ke3 Rf6 h5 Kf8 Kd3 Rf3+ Kd2 Rh3 Ke2 
37     +0.28   16:38    9027M Ng3 Nf6 Rf1 Ke7 Nf5+ Kf8 Ne3 Rd8 Rg1 Ra8 Rg2 Rd8 
                              Rg5 Ra8 Nf5 Rd8 Ke3 Kg8 Ng3 Ng4+ Kf3 Rf8+ Nf5 Nf6 
                              Ke2 Rd8 Ng3 Rf8 Rf5 Rd8 Nxh5 Nxh5 Rxh5 Rf8 Rh7 
                              Rf4 Ke3 Rg4 h5 Rh4 Kf3 Rh3+ Kf2 Rh2+ Ke3 Rh3+ Kd2 
                              Kf8 
37  >  +1.13   30:28   16533M Rxg4 hxg4 Ke2 Ke8 Ke3 Kf8 Kf2 Ke8 Ke2 Kf8 Ke3 Kg8 
                              Kf2 Kh8 Kg3 Kg8 Kxg4 Kh8 h5 Kg8 Kg5 Kf8 h6 gxh6+ 
                              Kxh6 Kg8 g7 Rf7 Kg6 Rxf5 exf5 e4 f6 
38  >  +4.77   42:44   23312M Rxg4 hxg4 Ke2 Ke8 Ke3 Kf8 Kf2 Ke8 Ke2 Kf8 Ke3 Ke8 
                              Kf2 Kd8 h5 c6 bxc6 Rc7 Nxd6 Re7 Nf7+ Kc7 Kg3 Re8 
                              h6 gxh6 Nxh6 b5 cxb5 c4 Nf5 c3 d6+ Kd8 Nh6 
Nodes: 23701079188
Nodes/second: 9081753
Best move: Rxg4
Ponder move: hxg4
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Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Test Position: 1.Rxg4!

Post by Terry McCracken »

acase wrote:This is one of those "locked pawn" positions that are notorious for giving engines a hard time. This was based on a game between Bent Larsen (white) and Eugenio Torre (black) after black's 45th move. The only thing I added was a black pawn on c7 so that the position would have only one solution, otherwise the boring and mundane 1.Ng3 (which is the inferior preferred move of most engines) would also win after black's 45th move in the Larsen vs Torre game.

This one probably will not be solved by most engines, so you might not want to let your engine think too long on it, instead (presumably after you give up :wink: ) just manually make the moves while your engine is analysing and watch the eval go up. The main line 1.Rxg4 hxg4 2.Ke3

[d] 5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w --



here is the game it is based on:

[Event "Brussels"]
[Site "Brussels"]
[Date "1987.04.11"]
[Round "2"]
[White "Larsen, Bent"]
[Black "Torre, Eugenio"]
[Result "1-0"]
[ECO "C24"]
[WhiteElo "2565"]
[BlackElo "2540"]
[PlyCount "111"]
[EventDate "1987.04.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "BEL"]
[EventCategory "14"]
[Source "ChessBase"]
[SourceDate "2004.01.01"]

1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Nf3 Be7 5. O-O d6 6. Re1 O-O 7. Nbd2 Nbd7 8. a3
h6 9. Ba2 Re8 10. Nf1 Nf8 11. Ng3 Be6 12. Bxe6 Nxe6 13. d4 Qc7 14. c4 Nh7 15.
d5 Neg5 16. Nf5 Nxf3+ 17. Qxf3 Kh8 18. Be3 c5 19. Rac1 Bg5 20. h4 Bxe3 21. Rxe3
Rac8 22. b4 Qd8 23. Qg3 Rg8 24. f4 f6 25. b5 Qd7 26. fxe5 fxe5 27. Qg6 Rcd8 28.
Rg3 Nf8 29. Qh5 Nh7 30. Re1 Rdf8 31. Rg6 Rf6 32. Rxf6 Nxf6 33. Qg6 Rf8 34. g4
Ne8 35. g5 Qf7 36. Qxf7 Rxf7 37. g6 Rd7 38. Rf1 Kg8 39. a4 h5 40. Kf2 Nf6 41.
Ke3 Kf8 42. a5 Rd8 43. Kd3 Rd7 44. a6 b6 45. Rg1 Ng4 46. Rxg4 hxg4 47. Ke3 Rd8
48. Kf2 Kg8 49. Kg3 Rd7 50. Kxg4 Kf8 51. Kg5 Kg8 52. h5 Kh8 53. h6 gxh6+ 54.
Nxh6 Kg7 55. Nf5+ Kf8 56. Kf6 1-0
It's terrible that comps still have trouble with these type of positions, the sac should be one of the first moves considered.
Terry McCracken
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User avatar
Dr.Wael Deeb
Posts: 9773
Joined: Wed Mar 08, 2006 8:44 pm
Location: Amman,Jordan

Re: Test Position: 1.Rxg4!

Post by Dr.Wael Deeb »

Terry McCracken wrote:
acase wrote:This is one of those "locked pawn" positions that are notorious for giving engines a hard time. This was based on a game between Bent Larsen (white) and Eugenio Torre (black) after black's 45th move. The only thing I added was a black pawn on c7 so that the position would have only one solution, otherwise the boring and mundane 1.Ng3 (which is the inferior preferred move of most engines) would also win after black's 45th move in the Larsen vs Torre game.

This one probably will not be solved by most engines, so you might not want to let your engine think too long on it, instead (presumably after you give up :wink: ) just manually make the moves while your engine is analysing and watch the eval go up. The main line 1.Rxg4 hxg4 2.Ke3

[d] 5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w --



here is the game it is based on:

[Event "Brussels"]
[Site "Brussels"]
[Date "1987.04.11"]
[Round "2"]
[White "Larsen, Bent"]
[Black "Torre, Eugenio"]
[Result "1-0"]
[ECO "C24"]
[WhiteElo "2565"]
[BlackElo "2540"]
[PlyCount "111"]
[EventDate "1987.04.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "BEL"]
[EventCategory "14"]
[Source "ChessBase"]
[SourceDate "2004.01.01"]

1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Nf3 Be7 5. O-O d6 6. Re1 O-O 7. Nbd2 Nbd7 8. a3
h6 9. Ba2 Re8 10. Nf1 Nf8 11. Ng3 Be6 12. Bxe6 Nxe6 13. d4 Qc7 14. c4 Nh7 15.
d5 Neg5 16. Nf5 Nxf3+ 17. Qxf3 Kh8 18. Be3 c5 19. Rac1 Bg5 20. h4 Bxe3 21. Rxe3
Rac8 22. b4 Qd8 23. Qg3 Rg8 24. f4 f6 25. b5 Qd7 26. fxe5 fxe5 27. Qg6 Rcd8 28.
Rg3 Nf8 29. Qh5 Nh7 30. Re1 Rdf8 31. Rg6 Rf6 32. Rxf6 Nxf6 33. Qg6 Rf8 34. g4
Ne8 35. g5 Qf7 36. Qxf7 Rxf7 37. g6 Rd7 38. Rf1 Kg8 39. a4 h5 40. Kf2 Nf6 41.
Ke3 Kf8 42. a5 Rd8 43. Kd3 Rd7 44. a6 b6 45. Rg1 Ng4 46. Rxg4 hxg4 47. Ke3 Rd8
48. Kf2 Kg8 49. Kg3 Rd7 50. Kxg4 Kf8 51. Kg5 Kg8 52. h5 Kh8 53. h6 gxh6+ 54.
Nxh6 Kg7 55. Nf5+ Kf8 56. Kf6 1-0
It's terrible that comps still have trouble with these type of positions, the sac should be one of the first moves considered.
Your buddy Ivan seems to do ok here Terry :wink:
_No one can hit as hard as life.But it ain’t about how hard you can hit.It’s about how hard you can get hit and keep moving forward.How much you can take and keep moving forward….
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zamar
Posts: 613
Joined: Sun Jan 18, 2009 7:03 am

Re: Test Position: 1.Rxg4!

Post by zamar »

Terry McCracken wrote: It's terrible that comps still have trouble with these type of positions, the sac should be one of the first moves considered.
It's a bad capture in a position with equal material balance and creates a passed pawn for opponent, so there is nothing "good" in this move.
Joona Kiiski
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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: 1.Rxg4!

Post by zullil »

zamar wrote:
Terry McCracken wrote: It's terrible that comps still have trouble with these type of positions, the sac should be one of the first moves considered.
It's a bad capture in a position with equal material balance and creates a passed pawn for opponent, so there is nothing "good" in this move.
I guess I tend to agree with Terry. The capture creates a worthless passed pawn for the opponent, but a potentially valuable one for the player making the move. It would be nice if engines had a better "understanding" of such positions.

But Stockfish did find the win (although it took 16 billion nodes). :D
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Robert Flesher
Posts: 1286
Joined: Tue Aug 18, 2009 3:06 am

Re: Test Position: 1.Rxg4!

Post by Robert Flesher »

Your all using the wrong engines ! :lol:


New game
5k2/p1pr2p1/Pp1p2P1/1PpPpN1p/2P1P1nP/3K4/8/6R1 w - - 0 1

Analysis by Deep Sjeng WC2008 x64:

1.Rf1 Ke8 2.Kc3 Kf8
= (-0.03) Depth: 3/7 00:00:00
1.Rf1 Nf6 2.Rf2 Rd8 3.Rf1
= (0.04) Depth: 4/7 00:00:00
1.Rf1 Nf6 2.Nh6 Rd8 3.Nf7 Rc8
= (-0.09) Depth: 5/9 00:00:00
1.Rf1 Nh2 2.Rf2 Ng4 3.Rf1
= (0.00) Depth: 6/11 00:00:00 16kN
1.Rf1 Nh2 2.Rf2 Ng4 3.Rf1
= (0.00) Depth: 7/15 00:00:00 20kN
1.Rf1 Nh2 2.Rf2 Ng4 3.Rf1
= (0.00) Depth: 8/15 00:00:00 34kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke7 5.Nf7 Ng4
= (0.12) Depth: 8/16 00:00:00 46kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke7 5.Nf7 Ng4
= (0.12) Depth: 9/17 00:00:00 56kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Rf5 Rd8 4.Nxh5 Nxh5 5.Rxh5 Rf8 6.Rf5 Rxf5 7.exf5
= (0.03) Depth: 10/17 00:00:00 81kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Rf5 Rd8 4.Nxh5 Nxh5 5.Rxh5 Rf8 6.Rf5 Rxf5 7.exf5
= (0.03) Depth: 11/17 00:00:00 105kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Rf5 Rd8 4.Nxh5 Nxh5 5.Rxh5 Kf6 6.Rf5+ Kxg6 7.h5+ Kh6
= (0.01) Depth: 12/20 00:00:00 157kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Rf5 Rd8 4.Nxh5 Nxh5 5.Rxh5 Kf6 6.Rf5+ Kxg6 7.h5+ Kh6 8.Rf7 Kxh5 9.Rxg7
= (0.05) Depth: 13/21 00:00:00 267kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Rf5 Rd8 4.Nxh5 Nxh5 5.Rxh5 Kf6 6.Rf5+ Kxg6 7.h5+ Kh6 8.Rf7 Kxh5 9.Rxg7
= (0.05) Depth: 14/24 00:00:00 442kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Rf1 Ke7 9.Rf2
= (0.18) Depth: 15/26 00:00:00 895kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Kg8 7.Ng5 Rd8 8.Ne6 Rc8 9.Rf1
= (0.21) Depth: 16/29 00:00:00 1334kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rf1 g6 10.Kd3
= (0.24) Depth: 17/29 00:00:00 2221kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rf1 Ng4+ 10.Ke2 Nf6 11.Kf3 Kd7 12.Rf2
² (0.27) Depth: 18/31 00:00:00 3820kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rg5 Kf8 10.Kf3 Kf7 11.Rg2
= (0.25) Depth: 19/31 00:00:00 5796kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rg5 Kf8 10.Kf3 Kf7 11.Rg2 Ng4
= (0.25) Depth: 20/31 00:00:01 8435kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rf1 Ke8
= (0.24) Depth: 21/32 00:00:01 14741kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 Ke8 5.Rf5 Kf8 6.Nf7 Rxf7 7.gxf7 Kxf7 8.Ke3 Ke7 9.Rf1 Ke8
= (0.24) Depth: 22/35 00:00:02 26711kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Nh6 gxh6 5.Rxf6+ Kg8 6.Re6 Kf8 7.Ke3 Rg7 8.Kd2 Rg8 9.Kc3 Kg7 10.Kd3 Kf8 11.Ke3 Kg7
= (0.00) Depth: 23/47 00:00:07 52551kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Ke2 Rd8 5.Nh6 Ke7 6.Nf7 Rf8 7.Ng5 Nd7 8.Rf7+ Rxf7 9.gxf7 Nf8 10.Ke3 Ng6 11.Kd3 Nxh4 12.Ke3 Ng2+ 13.Kf3 Nf4 14.Kg3 Kf8
= (0.00) Depth: 24/48 00:00:11 113452kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Ke2 Rd8 5.Nh6 Ke7 6.Nf7 Rf8 7.Ng5 Nd7 8.Rf7+ Rxf7 9.gxf7 Nf8 10.Kf3 Ng6 11.Kg3 Kf8 12.Ne6+ Kxf7 13.Nd8+ Kf6 14.Nc6 Nf4 15.Nxa7
= (0.00) Depth: 25/48 00:00:16 147036kN
1.Ng3 Nf6 2.Rf1 Ke7 3.Nf5+ Kf8 4.Ke2 Rd8 5.Nh6 Ke7 6.Nf7 Rf8 7.Ng5 Nd7 8.Rf7+ Rxf7 9.gxf7 Nf8 10.Kf3 Ng6 11.Kg3 Kf8 12.Ne6+ Kxf7 13.Nd8+ Kf6 14.Nc6 Nf4 15.Nxa7 Ne2+ 16.Kf3
= (0.00) Depth: 26/61 00:00:25 243027kN
1.Rxg4
² (0.30) Depth: 26/61 00:01:57 900351kN
1.Rxg4 hxg4 2.h5 Rd8 3.Ke3 Re8 4.Kf2 Rd8 5.Kg3 Kg8 6.Kxg4 Rf8 7.Kg5 Rd8 8.h6 gxh6+ 9.Kxh6 Rd7 10.g7 Kf7 11.Kh7 Rd8 12.Nh6+
+- (2.29) Depth: 26/61 00:04:54 2005065kN

(, Microsoft 18.02.2010)
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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: 1.Rxg4!

Post by zullil »

Robert Flesher wrote:Your all using the wrong engines ! :lol:
Nice. I wonder what other engines have the "understanding" to handle this position well.
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peter
Posts: 3400
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Test Position: 1.Rxg4!

Post by peter »

Analysis by ProDeo 1.6Q3:

1.Tf1 Sh2 2.Tf2 Sg4 3.Tf1
= (0.00) Tiefe: 6 00:00:00 8kN
1.Sg3
= (0.00) Tiefe: 6 00:00:00 9kN
...
1.Sg3 Sf6 2.Tf1 Ke7 3.Sf5+ Kf8 4.Ke2 Td8 5.Sg3 Ke7 6.Sf5+ Kf8 7.Sg3 Ke7 8.Sf5+
= (0.00) Tiefe: 12 00:00:00 387kN
1.Tf1 Sh2 2.Tb1 Kg8 3.Sg3 Sf3 4.Th1 Td8 5.Sxh5 Tf8
= (0.16) Tiefe: 12 00:00:00 537kN
1.Ke2 Ke8 2.Sg3 Sf6 3.Tf1 Ke7 4.Sf5+ Kf8 5.Sg3 Ke7 6.Sf5+ Kf8 7.Sg3
+/= (0.27) Tiefe: 12 00:00:00 813kN
...
1.Ke2 Sf6 2.Kf3 Td8 3.Tb1 Ta8 4.Ta1 Tb8 5.Sg3 Ke7 6.Sf5+ Kf8 7.Sg3 Ke7 8.Sf5+
+/= (0.37) Tiefe: 18 00:00:39 72993kN
1.Txg4
+/= (0.37) Tiefe: 18 00:00:44 83001kN
1.Txg4 hxg4 2.Ke2 Ke8 3.Kf2 Kf8 4.Kg3 Td8 5.Kxg4 Ta8 6.h5 Tc8 7.Kg5 Tb8 8.Sxg7 Ke7 9.Se6 Ke8 10.Sxc7+ Kd8 11.g7 Kxc7 12.Kf5 Kd7
+- (1.97) Tiefe: 18 00:00:48 91519kN
1.Txg4 hxg4 2.Ke2 Td8 3.Kf2 Te8 4.Kg3 Kg8 5.Kg2 Kh8 6.Kg3 c6 7.Sxd6 Tf8 8.bxc6 Tf7 9.gxf7 b5
+- (2.47) Tiefe: 19 00:01:39 186mN
1.Txg4 hxg4 2.Ke2 Td8 3.h5 Ta8 4.Kf1 Kg8 5.Kf2 g3+ 6.Kxg3 Tb8 7.Kf3 Kf8 8.Kg4 Ta8 9.Kh4 Kg8 10.Kg5 Td8 11.h6 gxh6+ 12.Kg4 Tf8
+- (2.35) Tiefe: 20 00:02:07 241mN
Peter.
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