Test position and great long game by SF

[gleperlier]

[D]2r2rk1/1b1nbp2/1q1p2p1/RpnPp1Np/2p1P2P/2P1B1N1/1PB1QPP1/R5K1 w - - 0 30[\D]

In this position Komodo 6 just played 29...Qb6 after 2.11 minutes and evaluate +0
14.

SF played 30.Nxh5!

[pgn]
[Event "60m+15s, rated"]
[Site "Engine Room"]
[Date "2013.11.25"]
[Round "?"]
[White "Angler01, Stockfish 231113SL 6"]
[Black "Numerobis, Komodo 6 64-bit"]
[Result "1-0"]
[WhiteElo "2457"]
[BlackElo "2452"]
[PlyCount "66"]
[EventDate "2013.11.25"]

1. e4 {B 0} e5 {B 0} 2. Nf3 {B 0} Nc6 {B 0} 3. Bb5 {B 0} a6 {B 0} 4. Ba4 {B 0}
Nf6 {B 0} 5. O-O {B 0} Be7 {B 0} 6. Re1 {B 0} b5 {B 0} 7. Bb3 {B 0} O-O {B 0}
8. c3 {B 0} d6 {B 0} 9. h3 {B 0} Nb8 {B 0} 10. d4 {B 0} Nbd7 {B 0} 11. Nbd2 {
B 0} Bb7 {B 0} 12. Bc2 {B 0} Re8 {B 0} 13. Nf1 {B 0} Bf8 {B 0} 14. Ng3 {B 0} g6
{B 0} 15. a4 {B 0} c5 {B 0} 16. d5 {B 0} c4 {B 0} 17. Bg5 {B 0} h6 {B 0} 18.
Be3 {B 0} Nc5 {B 0} 19. Qd2 {B 0} h5 {B 0} 20. Bg5 {B 0} Be7 {B 0} 21. Bh6 {B 0
} Nh7 {B 0} 22. Be3 {B 0} Qc7 {0.14/26 72} 23. Ra3 {B 0 (Cf1)} Nf6 {0.14/28 259
} 24. Qe2 {B 0 (Fg5)} Nfd7 {0.14/26 141} 25. Ng5 {0.16/28 92 (Tea1)} Qd8 {0.14/
25 210} 26. h4 {B 0 (Cf3)} Rf8 {0.14/23 303} 27. Rea1 {0.56/29 123 (Cf1)} Rc8 {
0.27/24 564 (Ta8-b8)} 28. axb5 {0.96/31 101 (Cf1)} axb5 {0.28/22 72} 29. Ra5 {
0.92/33 71 (b3)} Qb6 {0.14/24 131 (Tc8-a8)} 30. Nxh5 {2.12/29 95 (T5a3)} gxh5 {
0.14/25 81 (Db6-d8)} 31. Qxh5 {3.01/32 165 (Ch7)} Nf6 {-0.14/21 34} 32. Qh6 {
3.13/32 49 (Df3)} Qc7 {1.46/23 617 (Db6-d8)} 33. f4 {5.11/31 112} Ncd7 {1.67/
20 74 Numerobis,Komodo 6 64-bit abandonne (Lag: Av=0.20s, max=0.6s)} 1-0
[/pgn]

[jdart]

Nice move.

Arasan, latest dev version, i5-2500k (4 cores), 2GB hash:

Code: Select all

16      3.40    R5a3    +0.08   18029933
17      5.40    R5a3    +0.08   28512609
18      7.88    Qf3     +0.08   40235926
18      9.55    Qf3     +0.08   48647344
19      15.85   Qf3     +0.00   81262745
20      25.60   Qf3     +0.00   130151072
21      45.86   Nf3     +0.00   232259451
21      59.08   Nf3     +0.00   300609100
22      105.41  Nf3     +0.00   541509245
23      151.12  Nf3     +0.00   787014785
24      260.44  R5a3!   +0.18   1375054550
24      354.73  Kh1     +0.26   1893033737
24      383.65  Kh1     +0.26   2052648708
25      722.39  Nxh5!   +0.44   3924534545
25      863.48  Nxh5    +0.74   4722108664
5.48M nodes/second.
0 tablebase probes, 0 tablebase hits
49577 splits, average thread usage=4.00
result: Nxh5    score: +0.74            ++ solved in 722.39 sec. (3924.53M nodes
)
Nxh5 gxh5 Qxh5 Nf6 Qh6 Qc7 Rxb5 Ra8 Rf1 Ncd7 h5 Ra2 Kh1 Ba6 Rb4 Bb7 Bb1 Ra5 Kg1
Raa8 b3 Ba6 Rd1 Rfb8 Rxb8+ Qxb8

[Martin Hertz]

I've tested some DOS classics at 3.3 GHz:

Fritz 3, MChess 5, Genius 3, Gideon 1 and Socrates don't find this move within 30 minutes.
Chess System Tal DOS switches to Nxh5 in deph 10 after 80 seconds and WChess 1.05 in depth 9
after only 2 seconds, both with a score of about +1.10.

[ernst]

Stockfish excels at these king attacks, very impressive. "My" Houdini 4 went down in these kind of attacks more than once at playchess, having no clue

[kgburcham]

old antique Houdini 3

[D] 2r2rk1/1b1nbp2/1q1p2p1/RpnPp1Np/2p1P2P/2P1B1N1/1PB1QPP1/R5K1 w - -
24 processor(s) found, POPCNT available
NUMA configuration with 2 node(s), offset 0
Engine: Houdini 3 Pro x64 (4096 MB)
by Robert Houdart
20/73 0:21 +0.40++ 30.Nxh5 (733.203.638) 33406
20/73 0:22 +0.56++ 30.Nxh5 (761.840.547) 33465
other best move - reduce depth to 17
other best move - reduce depth to 18
18/73 0:23 +0.70 30.Nxh5 gxh5 (780.883.578) 33223
19/73 0:24 +0.81++ 30.Nxh5 (803.831.661) 33218
19/73 0:26 +1.03++ 30.Nxh5 (869.169.478) 33396
19/73 0:26 +0.94 30.Nxh5 gxh5 31.Qxh5 Nf6 32.Qh6 Qc7 33.Bd1 Qd7 (876.593.839) 33261
20/73 0:28 +1.05++ 30.Nxh5 (958.410.018) 33406
20/73 0:29 +1.01 30.Nxh5 gxh5 31.Qxh5 Nf6 32.Qh6 Qc7 33.Bd1 Qd7 34.Ra7 Rc7 35.Bxc5 Rxc5 36.Bh5 Bd8 37.Bg6 fxg6 38.Qxg6+ Kh8 (970.045.876) 33418
21/73 0:30 +1.01 30.Nxh5 gxh5 31.Qxh5 Nf6 32.Qh6 Qc7 33.Bd1 Qd7 34.Ra7 Rc7 35.Bxc5 Rxc5 36.Bh5 Bd8 37.Bg6 fxg6 38.Qxg6+ Kh8 (1.019.610.595) 33412
22/73 0:42 +1.12++ 30.Nxh5 (1.478.254.697) 34796
22/73 0:52 +1.34++ 30.Nxh5 (1.884.276.460) 35888
22/73 0:57 +1.34 30.Nxh5 gxh5 31.Qxh5 Nf6 32.Qh6 Qc7 33.Bd1 Qd7 34.Ra7 Rc7 35.Bxc5 Rxc5 36.Bh5 Bd8 37.Bg6 fxg6 38.Qxg6+ Kh8 (2.062.773.030) 36145

[Steve Maughan]

Nice position!

Houdini 4 Tactical on my 3.3 GHz Haswell 4770 find it in 5 mins 22 secs:

[D]2r2rk1/1b1nbp2/1q1p2p1/RpnPp1Np/2p1P2P/2P1B1N1/1PB1QPP1/R5K1 w - - 0 1

Analysis by Houdini 4 x64:

30.Nf1 Ra8 31.Rxa8 Rxa8 32.Rxa8+ Bxa8 33.Qf3 Bf6 34.Nd2 Qa6 35.Qd1 Bxg5 36.Bxg5 f6 37.Be3 Kg7 38.Bb1 Bb7 39.Qf3
= (0.12) Depth: 7/23 00:00:00 15kN
= (0.01) Depth: 12/30 00:00:00 724kN
30.R5a2 Nf6 31.f3 Ra8 32.Nf1 Rxa2 33.Rxa2 Kg7 34.Kh2 Nfd7 35.Qd2 Rd8 36.Ra1
= (0.09 ++) Depth: 12/30 00:00:00 863kN
= (0.01) Depth: 12/30 00:00:00 1269kN
30.R5a3 Kg7 31.b3 cxb3 32.Bxb3 Nf6 33.Bd1 Ra8 34.Qb2 Rxa3 35.Rxa3 Bc8 36.Nf1 Ng4 37.Bxg4 Bxg4 38.Ra1 Rc8 39.f3 Bd7 40.Kh2 Qc7 41.Qe2
= (0.07) Depth: 12/30 00:00:00 1960kN
= (0.09) Depth: 19/53 00:00:17 174mN
30.Bd1 Kg7
= (0.22 ++) Depth: 19/58 00:00:54 525mN
+/= (0.28 --) Depth: 22/59 00:02:34 1530mN
30.Nxh5 Rb8 31.Ng3 Bxg5 32.Bxg5 Na4 33.Rxb5 Nxc3 34.bxc3 Qxb5 35.Be7 Qb2 36.Rb1 Qxc3 37.Bxd6 Ba6 38.Bxb8 Rxb8 39.Rxb8+ Nxb8 40.h5 Nd7 41.Nf1 Nf6 42.hxg6 fxg6 43.Ne3 Qa1+ 44.Nd1 Kf7 45.Qe1 Qc1 46.Ba4 Bc8 47.f3 Bd7 48.Qb4 Bxa4 49.Qxa4
+/= (0.44 ++) Depth: 22/66 00:05:22 3219mN
+/- (1.04) Depth: 22/69 00:06:15 3733mN

(Maughan, Lake Mary 02.12.2013)

[tpetzke]

Hi Steve,

nice hardware.

The position is also nice, especially as iCE is able to solve it. Usually it has no chance with the here posted positions.

Code: Select all

info depth 14 seldepth 24 time 2948 nodes 2605992 pv b2b4 c4b3 c2b3 c8a8 a5a8 f8a8 a1a8 b7a8 b3c2 a8b7 c2d3 b6a5 d3b5 a5a1 g3f1 a1c3 nps 883986 score cp -5 
info depth 15 seldepth 26 time 2855 nodes 2785844 pv b2b4 c4b3 c2b3 c8a8 a5a8 f8a8 a1a8 b7a8 b3d1 b6a5 e2f3 f7f6 e3c5 d7c5 g5e6 nps 975777 score cp -3 
info depth 16 seldepth 26 time 7083 nodes 5952648 pv g3h5 g6h5 e2h5 d7f6 h5h6 c8a8 a5a8 b7a8 a1f1 a8b7 f2f4 f8a8 f4e5 d6e5 g1h1 a8a6 nps 840413 score cp 70 
bestmove g3h5 ponder g6h5
info time 15507 nodes 13602404 nps 877178

[gleperlier]

Well done ICE