Tricky bishop vs knight endgame

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beram
Posts: 1187
Joined: Wed Jan 06, 2010 2:11 pm

Tricky bishop vs knight endgame

Post by beram » Mon Mar 10, 2014 7:15 pm

In this interesting six pawns endgame with knight vs bishop, the black bishop must be very careful.
Houdini 4 lost track and was lost against Stockfish after Bh2 ?
It needs quite a long time on my system for Houdini 4 to find the right and only drawing move 45 ..Be3! at depth 30.
What do your engines think

[D] 8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45

game pgn is here
[pgn]
[Event "SF 050314 4x - Houdini 4(ct=0) 4x, 22m/"]
[Site "AMD X6 1090T 3200 Mhz (Fritzm"]
[Date "2014.03.08"]
[Round "17"]
[White "Stockfish 050314 64"]
[Black "Houdini 4 x64"]
[Result "1-0"]
[ECO "B22"]
[Annotator "0.09;0.05"]
[PlyCount "106"]
[TimeControl "40/1320:40/1320:40/1320"]

{AMD Phenom(tm) II X6 1090T Processor 3207 MHz W=34.8 plies; 6.196kN/s B=28.
3 plies; 8.172kN/s} 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Nf6 6. Be3
Bg4 7. dxc5 Qxd1+ 8. Kxd1 Nd5 {Both last book move} 9. Nbd2 {[%eval 9,26]
[%emt 0:00:30]} e6 {[%eval 5,24] [%emt 0:01:14] (e5)} 10. Bb5 {[%eval 10,26]
[%emt 0:00:36] (Nb3)} Nxe3+ {[%eval -4,24] [%emt 0:00:24]} 11. fxe3 {[%eval 10,
28] [%emt 0:00:20]} Bxc5 {[%eval 0,24] [%emt 0:00:27]} 12. Ke2 {[%eval 6,27]
[%emt 0:00:29]} O-O-O {[%eval -1,25] [%emt 0:00:34] (Rc8)} 13. Bxc6 {[%eval 25,
29] [%emt 0:00:34] (h3)} bxc6 {[%eval 0,24] [%emt 0:00:12]} 14. h3 {[%eval 25,
31] [%emt 0:00:21]} Bh5 {[%eval 1,25] [%emt 0:00:44]} 15. g4 {[%eval 24,30]
[%emt 0:00:40]} Bg6 {[%eval 1,23] [%emt 0:00:00]} 16. Ne5 {[%eval 32,30] [%emt
0:00:21]} Kc7 {[%eval 8,26] [%emt 0:01:30]} 17. Nxg6 {[%eval 22,27] [%emt 0:00:
22] (h4)} hxg6 {[%eval 1,25] [%emt 0:01:21]} 18. h4 {[%eval 18,28] [%emt 0:01:
04]} Be7 {[%eval 6,25] [%emt 0:00:55] (f6)} 19. Nf3 {[%eval 31,25] [%emt 0:00:
23]} a6 {[%eval 11,22] [%emt 0:00:44] (a5)} 20. b3 {[%eval 21,26] [%emt 0:01:
00] (a3)} f6 {[%eval 11,26] [%emt 0:02:47]} 21. e4 {[%eval 13,29] [%emt 0:00:
57] (Rag1)} Ba3 {[%eval 6,25] [%emt 0:00:36] (Bd6)} 22. Rab1 {[%eval 13,31]
[%emt 0:00:43]} Bd6 {[%eval 5,25] [%emt 0:01:09]} 23. Rbd1 {[%eval 13,31]
[%emt 0:00:22] (Rbf1)} a5 {[%eval 6,24] [%emt 0:01:06] (Bf4)} 24. Rhf1 {[%eval
20,28] [%emt 0:01:27] (g5)} a4 {[%eval 5,24] [%emt 0:00:35] (Rde8)} 25. b4 {
[%eval 10,29] [%emt 0:00:32] (g5)} Bf4 {[%eval 6,25] [%emt 0:00:20]} 26. Rxd8 {
[%eval 18,29] [%emt 0:00:23]} Kxd8 {[%eval 4,24] [%emt 0:00:17]} 27. c4 {
[%eval 24,30] [%emt 0:00:27]} e5 {[%eval 3,27] [%emt 0:00:19] (Bg3)} 28. c5 {
[%eval 4,30] [%emt 0:00:50] (a3)} Kc8 {[%eval 7,29] [%emt 0:01:04] (Ke7)} 29.
Kd3 {[%eval 18,32] [%emt 0:00:32]} Bg3 {[%eval 6,28] [%emt 0:00:45] (Kd7)} 30.
Rh1 {[%eval 25,33] [%emt 0:01:56]} Kc7 {[%eval 11,28] [%emt 0:01:08] (Kb8)} 31.
Kc4 {[%eval 44,32] [%emt 0:00:21] (Kc3)} Bf4 {[%eval 9,28] [%emt 0:00:18] (Kb7)
} 32. Rg1 {[%eval 31,35] [%emt 0:00:34] (Kc3)} Rd8 {[%eval 5,28] [%emt 0:00:37]
} 33. h5 {[%eval 47,33] [%emt 0:00:23] (Rf1)} g5 {[%eval 3,29] [%emt 0:00:16]
(Be3)} 34. Kc3 {[%eval 56,39] [%emt 0:02:27] (Re1)} Kb7 {[%eval 3,31] [%emt 0:
00:13]} 35. Rh1 {[%eval 27,35] [%emt 0:00:47] (a3)} Kc7 {[%eval 3,30] [%emt 0:
00:36]} 36. a3 {[%eval 27,36] [%emt 0:00:15] (Kc4)} Kb7 {[%eval 3,28] [%emt 0:
00:12]} 37. Re1 {[%eval 0,36] [%emt 0:00:24] (Kc4)} Ka6 {[%eval 3,31] [%emt 0:
00:17]} 38. Kc4 {[%eval 0,38] [%emt 0:00:29]} Kb7 {[%eval 3,32] [%emt 0:00:21]}
39. Rg1 {[%eval 0,40] [%emt 0:00:41]} Rd7 {[%eval 3,32] [%emt 0:00:30]} 40. Re1
{[%eval 0,43] [%emt 0:00:32]} Rd8 {[%eval 3,37] [%emt 0:00:19]} 41. Kc3 {
[%eval 0,44] [%emt 0:00:43] (Rg1)} Ka6 {[%eval 3,36] [%emt 0:00:21]} 42. Kc2 {
[%eval 0,44] [%emt 0:00:46] (Kc4)} Kb5 {[%eval 3,34] [%emt 0:00:25]} 43. Rd1 {
[%eval 0,46] [%emt 0:00:26] (Kc3)} Rxd1 {[%eval 0,29] [%emt 0:00:10]} 44. Kxd1
{[%eval 0,47] [%emt 0:00:25]} Kc4 {[%eval 0,33] [%emt 0:00:22]} 45. Ne1 {
[%eval 0,45] [%emt 0:00:25]} Bh2 {[%eval 0,32] [%emt 0:00:27] (Be3)} 46. Kc2 {
[%eval 235,42] [%emt 0:00:34] (Kd2)} Bg1 {[%eval 0,33] [%emt 0:00:22]} 47. Nd3
{[%eval 292,44] [%emt 0:00:59]} Bd4 {[%eval 0,31] [%emt 0:00:02]} 48. Nb2+ {
[%eval 295,44] [%emt 0:01:03]} Kb5 {[%eval 0,30] [%emt 0:00:00]} 49. Kb1 {
[%eval 295,44] [%emt 0:00:23] (Nd1)} Bg1 {[%eval 0,32] [%emt 0:00:29] (f5)} 50.
Kc1 {[%eval 795,37] [%emt 0:00:31] (Kc2)} Be3+ {[%eval 0,37] [%emt 0:00:27]}
51. Kd1 {[%eval 826,43] [%emt 0:00:36] (Kc2)} Bf2 {[%eval 285,29] [%emt 0:01:
11] (f5)} 52. Kd2 {[%eval 900,42] [%emt 0:00:32]} Bd4 {[%eval 280,30] [%emt 0:
00:38]} 53. Kc2 {[%eval 928,42] [%emt 0:00:22]} Bxb2 {[%eval 865,29] [%emt 0:
04:34] (Be3) adjud.} 1-0
[/pgn]

zullil
Posts: 5178
Joined: Mon Jan 08, 2007 11:31 pm
Location: PA USA
Full name: Louis Zulli

Re: Tricky bishop vs knight endgame

Post by zullil » Mon Mar 10, 2014 7:24 pm

beram wrote:In this interesting six pawns endgame with knight vs bishop, the black bishop must be very careful.
Houdini 4 lost track and was lost against Stockfish after Bh2 ?
It needs quite a long time on my system for Houdini 4 to find the right and only drawing move 45 ..Be3! at depth 30.
What do your engines think

[D] 8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45
Stockfish chooses Be3 in less than a second:

Code: Select all

info depth 16 seldepth 27 score cp 0 nodes 322336 nps 497432 time 648 multipv 1 pv f4e3 e1c2 e3f4 d1e2 f4c1 c2e3 c4b5 e3c2 b5c4

mwyoung
Posts: 1298
Joined: Wed May 12, 2010 8:00 pm

Re: Tricky bishop vs knight endgame

Post by mwyoung » Mon Mar 10, 2014 11:16 pm

beram wrote:In this interesting six pawns endgame with knight vs bishop, the black bishop must be very careful.
Houdini 4 lost track and was lost against Stockfish after Bh2 ?
It needs quite a long time on my system for Houdini 4 to find the right and only drawing move 45 ..Be3! at depth 30.
What do your engines think

[D] 8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45

game pgn is here
[pgn]
[Event "SF 050314 4x - Houdini 4(ct=0) 4x, 22m/"]
[Site "AMD X6 1090T 3200 Mhz (Fritzm"]
[Date "2014.03.08"]
[Round "17"]
[White "Stockfish 050314 64"]
[Black "Houdini 4 x64"]
[Result "1-0"]
[ECO "B22"]
[Annotator "0.09;0.05"]
[PlyCount "106"]
[TimeControl "40/1320:40/1320:40/1320"]

{AMD Phenom(tm) II X6 1090T Processor 3207 MHz W=34.8 plies; 6.196kN/s B=28.
3 plies; 8.172kN/s} 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Nf6 6. Be3
Bg4 7. dxc5 Qxd1+ 8. Kxd1 Nd5 {Both last book move} 9. Nbd2 {[%eval 9,26]
[%emt 0:00:30]} e6 {[%eval 5,24] [%emt 0:01:14] (e5)} 10. Bb5 {[%eval 10,26]
[%emt 0:00:36] (Nb3)} Nxe3+ {[%eval -4,24] [%emt 0:00:24]} 11. fxe3 {[%eval 10,
28] [%emt 0:00:20]} Bxc5 {[%eval 0,24] [%emt 0:00:27]} 12. Ke2 {[%eval 6,27]
[%emt 0:00:29]} O-O-O {[%eval -1,25] [%emt 0:00:34] (Rc8)} 13. Bxc6 {[%eval 25,
29] [%emt 0:00:34] (h3)} bxc6 {[%eval 0,24] [%emt 0:00:12]} 14. h3 {[%eval 25,
31] [%emt 0:00:21]} Bh5 {[%eval 1,25] [%emt 0:00:44]} 15. g4 {[%eval 24,30]
[%emt 0:00:40]} Bg6 {[%eval 1,23] [%emt 0:00:00]} 16. Ne5 {[%eval 32,30] [%emt
0:00:21]} Kc7 {[%eval 8,26] [%emt 0:01:30]} 17. Nxg6 {[%eval 22,27] [%emt 0:00:
22] (h4)} hxg6 {[%eval 1,25] [%emt 0:01:21]} 18. h4 {[%eval 18,28] [%emt 0:01:
04]} Be7 {[%eval 6,25] [%emt 0:00:55] (f6)} 19. Nf3 {[%eval 31,25] [%emt 0:00:
23]} a6 {[%eval 11,22] [%emt 0:00:44] (a5)} 20. b3 {[%eval 21,26] [%emt 0:01:
00] (a3)} f6 {[%eval 11,26] [%emt 0:02:47]} 21. e4 {[%eval 13,29] [%emt 0:00:
57] (Rag1)} Ba3 {[%eval 6,25] [%emt 0:00:36] (Bd6)} 22. Rab1 {[%eval 13,31]
[%emt 0:00:43]} Bd6 {[%eval 5,25] [%emt 0:01:09]} 23. Rbd1 {[%eval 13,31]
[%emt 0:00:22] (Rbf1)} a5 {[%eval 6,24] [%emt 0:01:06] (Bf4)} 24. Rhf1 {[%eval
20,28] [%emt 0:01:27] (g5)} a4 {[%eval 5,24] [%emt 0:00:35] (Rde8)} 25. b4 {
[%eval 10,29] [%emt 0:00:32] (g5)} Bf4 {[%eval 6,25] [%emt 0:00:20]} 26. Rxd8 {
[%eval 18,29] [%emt 0:00:23]} Kxd8 {[%eval 4,24] [%emt 0:00:17]} 27. c4 {
[%eval 24,30] [%emt 0:00:27]} e5 {[%eval 3,27] [%emt 0:00:19] (Bg3)} 28. c5 {
[%eval 4,30] [%emt 0:00:50] (a3)} Kc8 {[%eval 7,29] [%emt 0:01:04] (Ke7)} 29.
Kd3 {[%eval 18,32] [%emt 0:00:32]} Bg3 {[%eval 6,28] [%emt 0:00:45] (Kd7)} 30.
Rh1 {[%eval 25,33] [%emt 0:01:56]} Kc7 {[%eval 11,28] [%emt 0:01:08] (Kb8)} 31.
Kc4 {[%eval 44,32] [%emt 0:00:21] (Kc3)} Bf4 {[%eval 9,28] [%emt 0:00:18] (Kb7)
} 32. Rg1 {[%eval 31,35] [%emt 0:00:34] (Kc3)} Rd8 {[%eval 5,28] [%emt 0:00:37]
} 33. h5 {[%eval 47,33] [%emt 0:00:23] (Rf1)} g5 {[%eval 3,29] [%emt 0:00:16]
(Be3)} 34. Kc3 {[%eval 56,39] [%emt 0:02:27] (Re1)} Kb7 {[%eval 3,31] [%emt 0:
00:13]} 35. Rh1 {[%eval 27,35] [%emt 0:00:47] (a3)} Kc7 {[%eval 3,30] [%emt 0:
00:36]} 36. a3 {[%eval 27,36] [%emt 0:00:15] (Kc4)} Kb7 {[%eval 3,28] [%emt 0:
00:12]} 37. Re1 {[%eval 0,36] [%emt 0:00:24] (Kc4)} Ka6 {[%eval 3,31] [%emt 0:
00:17]} 38. Kc4 {[%eval 0,38] [%emt 0:00:29]} Kb7 {[%eval 3,32] [%emt 0:00:21]}
39. Rg1 {[%eval 0,40] [%emt 0:00:41]} Rd7 {[%eval 3,32] [%emt 0:00:30]} 40. Re1
{[%eval 0,43] [%emt 0:00:32]} Rd8 {[%eval 3,37] [%emt 0:00:19]} 41. Kc3 {
[%eval 0,44] [%emt 0:00:43] (Rg1)} Ka6 {[%eval 3,36] [%emt 0:00:21]} 42. Kc2 {
[%eval 0,44] [%emt 0:00:46] (Kc4)} Kb5 {[%eval 3,34] [%emt 0:00:25]} 43. Rd1 {
[%eval 0,46] [%emt 0:00:26] (Kc3)} Rxd1 {[%eval 0,29] [%emt 0:00:10]} 44. Kxd1
{[%eval 0,47] [%emt 0:00:25]} Kc4 {[%eval 0,33] [%emt 0:00:22]} 45. Ne1 {
[%eval 0,45] [%emt 0:00:25]} Bh2 {[%eval 0,32] [%emt 0:00:27] (Be3)} 46. Kc2 {
[%eval 235,42] [%emt 0:00:34] (Kd2)} Bg1 {[%eval 0,33] [%emt 0:00:22]} 47. Nd3
{[%eval 292,44] [%emt 0:00:59]} Bd4 {[%eval 0,31] [%emt 0:00:02]} 48. Nb2+ {
[%eval 295,44] [%emt 0:01:03]} Kb5 {[%eval 0,30] [%emt 0:00:00]} 49. Kb1 {
[%eval 295,44] [%emt 0:00:23] (Nd1)} Bg1 {[%eval 0,32] [%emt 0:00:29] (f5)} 50.
Kc1 {[%eval 795,37] [%emt 0:00:31] (Kc2)} Be3+ {[%eval 0,37] [%emt 0:00:27]}
51. Kd1 {[%eval 826,43] [%emt 0:00:36] (Kc2)} Bf2 {[%eval 285,29] [%emt 0:01:
11] (f5)} 52. Kd2 {[%eval 900,42] [%emt 0:00:32]} Bd4 {[%eval 280,30] [%emt 0:
00:38]} 53. Kc2 {[%eval 928,42] [%emt 0:00:22]} Bxb2 {[%eval 865,29] [%emt 0:
04:34] (Be3) adjud.} 1-0
[/pgn]
Bram Mourik: "But besides that, I observe no "clueless" Houdini 4 in my H4-SF matches neither. "
Professing themselves to be wise, they became fools,

User avatar
sicilianquake87
Posts: 232
Joined: Wed Nov 14, 2012 2:24 pm
Location: Italy

Re: Tricky bishop vs knight endgame

Post by sicilianquake87 » Mon Mar 10, 2014 11:20 pm

mwyoung wrote:
beram wrote:In this interesting six pawns endgame with knight vs bishop, the black bishop must be very careful.
Houdini 4 lost track and was lost against Stockfish after Bh2 ?
It needs quite a long time on my system for Houdini 4 to find the right and only drawing move 45 ..Be3! at depth 30.
What do your engines think

[D] 8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45

game pgn is here
[pgn]
[Event "SF 050314 4x - Houdini 4(ct=0) 4x, 22m/"]
[Site "AMD X6 1090T 3200 Mhz (Fritzm"]
[Date "2014.03.08"]
[Round "17"]
[White "Stockfish 050314 64"]
[Black "Houdini 4 x64"]
[Result "1-0"]
[ECO "B22"]
[Annotator "0.09;0.05"]
[PlyCount "106"]
[TimeControl "40/1320:40/1320:40/1320"]

{AMD Phenom(tm) II X6 1090T Processor 3207 MHz W=34.8 plies; 6.196kN/s B=28.
3 plies; 8.172kN/s} 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Nf6 6. Be3
Bg4 7. dxc5 Qxd1+ 8. Kxd1 Nd5 {Both last book move} 9. Nbd2 {[%eval 9,26]
[%emt 0:00:30]} e6 {[%eval 5,24] [%emt 0:01:14] (e5)} 10. Bb5 {[%eval 10,26]
[%emt 0:00:36] (Nb3)} Nxe3+ {[%eval -4,24] [%emt 0:00:24]} 11. fxe3 {[%eval 10,
28] [%emt 0:00:20]} Bxc5 {[%eval 0,24] [%emt 0:00:27]} 12. Ke2 {[%eval 6,27]
[%emt 0:00:29]} O-O-O {[%eval -1,25] [%emt 0:00:34] (Rc8)} 13. Bxc6 {[%eval 25,
29] [%emt 0:00:34] (h3)} bxc6 {[%eval 0,24] [%emt 0:00:12]} 14. h3 {[%eval 25,
31] [%emt 0:00:21]} Bh5 {[%eval 1,25] [%emt 0:00:44]} 15. g4 {[%eval 24,30]
[%emt 0:00:40]} Bg6 {[%eval 1,23] [%emt 0:00:00]} 16. Ne5 {[%eval 32,30] [%emt
0:00:21]} Kc7 {[%eval 8,26] [%emt 0:01:30]} 17. Nxg6 {[%eval 22,27] [%emt 0:00:
22] (h4)} hxg6 {[%eval 1,25] [%emt 0:01:21]} 18. h4 {[%eval 18,28] [%emt 0:01:
04]} Be7 {[%eval 6,25] [%emt 0:00:55] (f6)} 19. Nf3 {[%eval 31,25] [%emt 0:00:
23]} a6 {[%eval 11,22] [%emt 0:00:44] (a5)} 20. b3 {[%eval 21,26] [%emt 0:01:
00] (a3)} f6 {[%eval 11,26] [%emt 0:02:47]} 21. e4 {[%eval 13,29] [%emt 0:00:
57] (Rag1)} Ba3 {[%eval 6,25] [%emt 0:00:36] (Bd6)} 22. Rab1 {[%eval 13,31]
[%emt 0:00:43]} Bd6 {[%eval 5,25] [%emt 0:01:09]} 23. Rbd1 {[%eval 13,31]
[%emt 0:00:22] (Rbf1)} a5 {[%eval 6,24] [%emt 0:01:06] (Bf4)} 24. Rhf1 {[%eval
20,28] [%emt 0:01:27] (g5)} a4 {[%eval 5,24] [%emt 0:00:35] (Rde8)} 25. b4 {
[%eval 10,29] [%emt 0:00:32] (g5)} Bf4 {[%eval 6,25] [%emt 0:00:20]} 26. Rxd8 {
[%eval 18,29] [%emt 0:00:23]} Kxd8 {[%eval 4,24] [%emt 0:00:17]} 27. c4 {
[%eval 24,30] [%emt 0:00:27]} e5 {[%eval 3,27] [%emt 0:00:19] (Bg3)} 28. c5 {
[%eval 4,30] [%emt 0:00:50] (a3)} Kc8 {[%eval 7,29] [%emt 0:01:04] (Ke7)} 29.
Kd3 {[%eval 18,32] [%emt 0:00:32]} Bg3 {[%eval 6,28] [%emt 0:00:45] (Kd7)} 30.
Rh1 {[%eval 25,33] [%emt 0:01:56]} Kc7 {[%eval 11,28] [%emt 0:01:08] (Kb8)} 31.
Kc4 {[%eval 44,32] [%emt 0:00:21] (Kc3)} Bf4 {[%eval 9,28] [%emt 0:00:18] (Kb7)
} 32. Rg1 {[%eval 31,35] [%emt 0:00:34] (Kc3)} Rd8 {[%eval 5,28] [%emt 0:00:37]
} 33. h5 {[%eval 47,33] [%emt 0:00:23] (Rf1)} g5 {[%eval 3,29] [%emt 0:00:16]
(Be3)} 34. Kc3 {[%eval 56,39] [%emt 0:02:27] (Re1)} Kb7 {[%eval 3,31] [%emt 0:
00:13]} 35. Rh1 {[%eval 27,35] [%emt 0:00:47] (a3)} Kc7 {[%eval 3,30] [%emt 0:
00:36]} 36. a3 {[%eval 27,36] [%emt 0:00:15] (Kc4)} Kb7 {[%eval 3,28] [%emt 0:
00:12]} 37. Re1 {[%eval 0,36] [%emt 0:00:24] (Kc4)} Ka6 {[%eval 3,31] [%emt 0:
00:17]} 38. Kc4 {[%eval 0,38] [%emt 0:00:29]} Kb7 {[%eval 3,32] [%emt 0:00:21]}
39. Rg1 {[%eval 0,40] [%emt 0:00:41]} Rd7 {[%eval 3,32] [%emt 0:00:30]} 40. Re1
{[%eval 0,43] [%emt 0:00:32]} Rd8 {[%eval 3,37] [%emt 0:00:19]} 41. Kc3 {
[%eval 0,44] [%emt 0:00:43] (Rg1)} Ka6 {[%eval 3,36] [%emt 0:00:21]} 42. Kc2 {
[%eval 0,44] [%emt 0:00:46] (Kc4)} Kb5 {[%eval 3,34] [%emt 0:00:25]} 43. Rd1 {
[%eval 0,46] [%emt 0:00:26] (Kc3)} Rxd1 {[%eval 0,29] [%emt 0:00:10]} 44. Kxd1
{[%eval 0,47] [%emt 0:00:25]} Kc4 {[%eval 0,33] [%emt 0:00:22]} 45. Ne1 {
[%eval 0,45] [%emt 0:00:25]} Bh2 {[%eval 0,32] [%emt 0:00:27] (Be3)} 46. Kc2 {
[%eval 235,42] [%emt 0:00:34] (Kd2)} Bg1 {[%eval 0,33] [%emt 0:00:22]} 47. Nd3
{[%eval 292,44] [%emt 0:00:59]} Bd4 {[%eval 0,31] [%emt 0:00:02]} 48. Nb2+ {
[%eval 295,44] [%emt 0:01:03]} Kb5 {[%eval 0,30] [%emt 0:00:00]} 49. Kb1 {
[%eval 295,44] [%emt 0:00:23] (Nd1)} Bg1 {[%eval 0,32] [%emt 0:00:29] (f5)} 50.
Kc1 {[%eval 795,37] [%emt 0:00:31] (Kc2)} Be3+ {[%eval 0,37] [%emt 0:00:27]}
51. Kd1 {[%eval 826,43] [%emt 0:00:36] (Kc2)} Bf2 {[%eval 285,29] [%emt 0:01:
11] (f5)} 52. Kd2 {[%eval 900,42] [%emt 0:00:32]} Bd4 {[%eval 280,30] [%emt 0:
00:38]} 53. Kc2 {[%eval 928,42] [%emt 0:00:22]} Bxb2 {[%eval 865,29] [%emt 0:
04:34] (Be3) adjud.} 1-0
[/pgn]
Bram Mourik: "But besides that, I observe no "clueless" Houdini 4 in my H4-SF matches neither. "
He was right then: this is SF-H4. :lol:
Someone spitting venom is annoying but harmless. He won't achieve anything. The real harm is done by nicely worded venom. (Ronald de Man)

mwyoung
Posts: 1298
Joined: Wed May 12, 2010 8:00 pm

Re: Tricky bishop vs knight endgame

Post by mwyoung » Tue Mar 11, 2014 1:05 pm

sicilianquake87 wrote:
mwyoung wrote:
beram wrote:In this interesting six pawns endgame with knight vs bishop, the black bishop must be very careful.
Houdini 4 lost track and was lost against Stockfish after Bh2 ?
It needs quite a long time on my system for Houdini 4 to find the right and only drawing move 45 ..Be3! at depth 30.
What do your engines think

[D] 8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45

game pgn is here
[pgn]
[Event "SF 050314 4x - Houdini 4(ct=0) 4x, 22m/"]
[Site "AMD X6 1090T 3200 Mhz (Fritzm"]
[Date "2014.03.08"]
[Round "17"]
[White "Stockfish 050314 64"]
[Black "Houdini 4 x64"]
[Result "1-0"]
[ECO "B22"]
[Annotator "0.09;0.05"]
[PlyCount "106"]
[TimeControl "40/1320:40/1320:40/1320"]

{AMD Phenom(tm) II X6 1090T Processor 3207 MHz W=34.8 plies; 6.196kN/s B=28.
3 plies; 8.172kN/s} 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Nf6 6. Be3
Bg4 7. dxc5 Qxd1+ 8. Kxd1 Nd5 {Both last book move} 9. Nbd2 {[%eval 9,26]
[%emt 0:00:30]} e6 {[%eval 5,24] [%emt 0:01:14] (e5)} 10. Bb5 {[%eval 10,26]
[%emt 0:00:36] (Nb3)} Nxe3+ {[%eval -4,24] [%emt 0:00:24]} 11. fxe3 {[%eval 10,
28] [%emt 0:00:20]} Bxc5 {[%eval 0,24] [%emt 0:00:27]} 12. Ke2 {[%eval 6,27]
[%emt 0:00:29]} O-O-O {[%eval -1,25] [%emt 0:00:34] (Rc8)} 13. Bxc6 {[%eval 25,
29] [%emt 0:00:34] (h3)} bxc6 {[%eval 0,24] [%emt 0:00:12]} 14. h3 {[%eval 25,
31] [%emt 0:00:21]} Bh5 {[%eval 1,25] [%emt 0:00:44]} 15. g4 {[%eval 24,30]
[%emt 0:00:40]} Bg6 {[%eval 1,23] [%emt 0:00:00]} 16. Ne5 {[%eval 32,30] [%emt
0:00:21]} Kc7 {[%eval 8,26] [%emt 0:01:30]} 17. Nxg6 {[%eval 22,27] [%emt 0:00:
22] (h4)} hxg6 {[%eval 1,25] [%emt 0:01:21]} 18. h4 {[%eval 18,28] [%emt 0:01:
04]} Be7 {[%eval 6,25] [%emt 0:00:55] (f6)} 19. Nf3 {[%eval 31,25] [%emt 0:00:
23]} a6 {[%eval 11,22] [%emt 0:00:44] (a5)} 20. b3 {[%eval 21,26] [%emt 0:01:
00] (a3)} f6 {[%eval 11,26] [%emt 0:02:47]} 21. e4 {[%eval 13,29] [%emt 0:00:
57] (Rag1)} Ba3 {[%eval 6,25] [%emt 0:00:36] (Bd6)} 22. Rab1 {[%eval 13,31]
[%emt 0:00:43]} Bd6 {[%eval 5,25] [%emt 0:01:09]} 23. Rbd1 {[%eval 13,31]
[%emt 0:00:22] (Rbf1)} a5 {[%eval 6,24] [%emt 0:01:06] (Bf4)} 24. Rhf1 {[%eval
20,28] [%emt 0:01:27] (g5)} a4 {[%eval 5,24] [%emt 0:00:35] (Rde8)} 25. b4 {
[%eval 10,29] [%emt 0:00:32] (g5)} Bf4 {[%eval 6,25] [%emt 0:00:20]} 26. Rxd8 {
[%eval 18,29] [%emt 0:00:23]} Kxd8 {[%eval 4,24] [%emt 0:00:17]} 27. c4 {
[%eval 24,30] [%emt 0:00:27]} e5 {[%eval 3,27] [%emt 0:00:19] (Bg3)} 28. c5 {
[%eval 4,30] [%emt 0:00:50] (a3)} Kc8 {[%eval 7,29] [%emt 0:01:04] (Ke7)} 29.
Kd3 {[%eval 18,32] [%emt 0:00:32]} Bg3 {[%eval 6,28] [%emt 0:00:45] (Kd7)} 30.
Rh1 {[%eval 25,33] [%emt 0:01:56]} Kc7 {[%eval 11,28] [%emt 0:01:08] (Kb8)} 31.
Kc4 {[%eval 44,32] [%emt 0:00:21] (Kc3)} Bf4 {[%eval 9,28] [%emt 0:00:18] (Kb7)
} 32. Rg1 {[%eval 31,35] [%emt 0:00:34] (Kc3)} Rd8 {[%eval 5,28] [%emt 0:00:37]
} 33. h5 {[%eval 47,33] [%emt 0:00:23] (Rf1)} g5 {[%eval 3,29] [%emt 0:00:16]
(Be3)} 34. Kc3 {[%eval 56,39] [%emt 0:02:27] (Re1)} Kb7 {[%eval 3,31] [%emt 0:
00:13]} 35. Rh1 {[%eval 27,35] [%emt 0:00:47] (a3)} Kc7 {[%eval 3,30] [%emt 0:
00:36]} 36. a3 {[%eval 27,36] [%emt 0:00:15] (Kc4)} Kb7 {[%eval 3,28] [%emt 0:
00:12]} 37. Re1 {[%eval 0,36] [%emt 0:00:24] (Kc4)} Ka6 {[%eval 3,31] [%emt 0:
00:17]} 38. Kc4 {[%eval 0,38] [%emt 0:00:29]} Kb7 {[%eval 3,32] [%emt 0:00:21]}
39. Rg1 {[%eval 0,40] [%emt 0:00:41]} Rd7 {[%eval 3,32] [%emt 0:00:30]} 40. Re1
{[%eval 0,43] [%emt 0:00:32]} Rd8 {[%eval 3,37] [%emt 0:00:19]} 41. Kc3 {
[%eval 0,44] [%emt 0:00:43] (Rg1)} Ka6 {[%eval 3,36] [%emt 0:00:21]} 42. Kc2 {
[%eval 0,44] [%emt 0:00:46] (Kc4)} Kb5 {[%eval 3,34] [%emt 0:00:25]} 43. Rd1 {
[%eval 0,46] [%emt 0:00:26] (Kc3)} Rxd1 {[%eval 0,29] [%emt 0:00:10]} 44. Kxd1
{[%eval 0,47] [%emt 0:00:25]} Kc4 {[%eval 0,33] [%emt 0:00:22]} 45. Ne1 {
[%eval 0,45] [%emt 0:00:25]} Bh2 {[%eval 0,32] [%emt 0:00:27] (Be3)} 46. Kc2 {
[%eval 235,42] [%emt 0:00:34] (Kd2)} Bg1 {[%eval 0,33] [%emt 0:00:22]} 47. Nd3
{[%eval 292,44] [%emt 0:00:59]} Bd4 {[%eval 0,31] [%emt 0:00:02]} 48. Nb2+ {
[%eval 295,44] [%emt 0:01:03]} Kb5 {[%eval 0,30] [%emt 0:00:00]} 49. Kb1 {
[%eval 295,44] [%emt 0:00:23] (Nd1)} Bg1 {[%eval 0,32] [%emt 0:00:29] (f5)} 50.
Kc1 {[%eval 795,37] [%emt 0:00:31] (Kc2)} Be3+ {[%eval 0,37] [%emt 0:00:27]}
51. Kd1 {[%eval 826,43] [%emt 0:00:36] (Kc2)} Bf2 {[%eval 285,29] [%emt 0:01:
11] (f5)} 52. Kd2 {[%eval 900,42] [%emt 0:00:32]} Bd4 {[%eval 280,30] [%emt 0:
00:38]} 53. Kc2 {[%eval 928,42] [%emt 0:00:22]} Bxb2 {[%eval 865,29] [%emt 0:
04:34] (Be3) adjud.} 1-0
[/pgn]
Bram Mourik: "But besides that, I observe no "clueless" Houdini 4 in my H4-SF matches neither. "
He was right then: this is SF-H4. :lol:
Yes, the poster in the H4 "clueless" thread was correct. This is exactly what that poster was talking about in his SF-H4 games.

That Bram claimed clearly as a bias Houdini 4 fan does not happen to H4 when playing Stockfish.

Then Bram himself post a position and game where Houdini 4 is "clueless" playing Stockfish.

The irony is too rich...

Bram should apologize to that poster in the "H4 Clueless" thread.
Professing themselves to be wise, they became fools,

beram
Posts: 1187
Joined: Wed Jan 06, 2010 2:11 pm

Re: Tricky bishop vs knight endgame

Post by beram » Tue Mar 11, 2014 7:32 pm

Dear Mark, yes the irony is certainly looking too obvious here :)
I went through al the decisive games played
and this was the only example out of 50 games at CCRL 40/40TC where I could criticize Houdini 4 for blundering
I let Houdini 3 run on the position and it found Be3 much faster
Perhaps something to look at for Robert Houdart

Btw. I am as much a Stockfish- as a Houdini-fan

shrapnel
Posts: 1144
Joined: Fri Nov 02, 2012 8:43 am
Location: New Delhi, India

Re: Tricky bishop vs knight endgame

Post by shrapnel » Wed Mar 12, 2014 9:24 am

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/6p1/2p2p2/2P1p1pP/pPk1PbP1/P7/8/3KN3 b - - 0 45"]
[PlyCount "1"]

45... Be3 {0.00/28 3} *

What on Earth are you guys talking about ? My Houdini 4 finds 45...Be3 almost INSTANTLY !
For chrissake, junk your museum piece computers and buy some decent, modern computers. Stop humiliating H4 by forcing it to play on your antique computers. My Grandma's computer is faster, for chrissake !!
i7 5960X @ 4.1 Ghz, 64 GB G.Skill RipJaws RAM, Asus ROG Strix 11 GB Geforce 1080 Ti and AMD Ryzen 7 1800X @4.0 GHz, 32 GB DDR4-2400 G.Skill RAM, ASUS Prime x370-PRO, Noctua NH-D15 SE-AM4 Cooler.

mwyoung
Posts: 1298
Joined: Wed May 12, 2010 8:00 pm

Re: Tricky bishop vs knight endgame

Post by mwyoung » Wed Mar 12, 2014 4:35 pm

Thanks for using the words HFB in other thread. And getting the thread locked and half deleted Louis. :)

Now you know what happens...
Professing themselves to be wise, they became fools,

beram
Posts: 1187
Joined: Wed Jan 06, 2010 2:11 pm

Re: Tricky bishop vs knight endgame

Post by beram » Wed Mar 12, 2014 4:54 pm

Here a picture of Houdini 4 in multi PV mode two lines and Houdini 3 as kibitzer with one core less. You can notice the difference
Houdini 3 gives Be3 0.00 and Kd4 +0,30 while Houdini 4 till depth 33 at least gives Bh2? and Be3 both 0.00

Image

Perhaps something with hash refresh or other ?[/img]
Last edited by beram on Wed Mar 12, 2014 4:59 pm, edited 1 time in total.

mwyoung
Posts: 1298
Joined: Wed May 12, 2010 8:00 pm

Re: Tricky bishop vs knight endgame

Post by mwyoung » Wed Mar 12, 2014 4:57 pm

Only a man as learned as yourself would blame the hardware, for what the software instructed the hardware to do.
Professing themselves to be wise, they became fools,

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