Test position for strong engines

[bhlangonijr]

From the game: Leitao,R (2626) - El Debs,F (2502) - Brazilian Chess Championship.

http://www.chessbase.com/newsdetail.asp?newsid=6858

[D] rn2r1k1/ppq1pp1p/2b2bp1/8/2BNPP1B/2P4P/P1Q3P1/1R3RK1 w - - 1 18

Stockfish 1.9.1 took more than one minute to find Bxf7+ (using a core2duo 2.4).

Regards,

[gerold]

Houdini 1.3 fines it in 2 seconds. Using core 2 duo.

[zullil]

From the game: Leitao,R (2626) - El Debs,F (2502) - Brazilian Chess Championship.

http://www.chessbase.com/newsdetail.asp?newsid=6858

[D] rn2r1k1/ppq1pp1p/2b2bp1/8/2BNPP1B/2P4P/P1Q3P1/1R3RK1 w - - 1 18

Stockfish 1.9.1 took more than one minute to find Bxf7+ (using a core2duo 2.4).

Regards,

Spark-1.0 (8 threads) takes 16 seconds:

Code: Select all

info depth 17 seldepth 43 score cp 143 lowerbound time 16479 nodes 217385730 nps 13191682 hashfull 778 pv c4f7 g8f7
info depth 17 currmovenumber 1 currmove c4f7 time 16479 nodes 217385730 nps 13191682 hashfull 778
info depth 17 seldepth 43 score cp 168 lowerbound time 16927 nodes 223492615 nps 13203321 hashfull 789 pv c4f7 g8f7
info depth 17 currmovenumber 1 currmove c4f7 time 16927 nodes 223492615 nps 13203321 hashfull 789
info depth 17 seldepth 43 score cp 236 time 18636 nodes 244653903 nps 13128026 hashfull 831 pv c4f7 g8f7 c2b3 e7e6 f4f5 g6g5 f5e6 f7g6 b3c2 f6e5 h4g5 h7h6 g5e3 e8e7 c2f2 b8a6 d4c6 b7c6 f2h4 a8h8 h4g4 g6h7 g4f5 h7g7

[rvida]

About one second for Critter 0.90 (single core):

Code: Select all

rn2r1k1/ppq1pp1p/2b2bp1/8/2BNPP1B/2P4P/P1Q3P1/1R3RK1 w - -

Engine: Critter 0.90 64-bit SSE4 (128 MB)
by Richard Vida

12/41  0:01   +2.03++  1.Bxf7+ (3.557.023) 1805 

12/41  0:02   +1.91    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Bxe4 
                       7.Rxf6+ Kg8 8.Nxe6 Qb6+ 9.Qxb6 axb6 
                       10.Nc7 Bd3 11.Nxa8 Bxf1 12.Nxb6 (4.545.513) 1804 

13/41  0:02   +1.90    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Bxe4 
                       7.Rxf6+ Kg8 8.Nxe6 Qb6+ 9.Qxb6 axb6 
                       10.Nc7 Bd3 11.Rd1 Bc2 12.Nxa8 Bxd1 
                       13.Nxb6 (4.804.441) 1805 

14/41  0:03   +1.78--  1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Bxe4 
                       7.Rxf6+ Kg8 8.Nxe6 Qb6+ 9.Qxb6 axb6 
                       10.Nc7 Bd3 11.Rd1 Bc2 12.Nxa8 Bxd1 
                       13.Nxb6 (5.604.093) 1825 

14/45  0:03   +2.01++  1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Bxe4 
                       7.Rxf6+ Kg8 8.Nxe6 Qb6+ 9.Qxb6 axb6 
                       10.Nc7 Bd3 11.Rd1 Bc2 12.Nxa8 Bxd1 
                       13.Nxb6 (6.328.689) 1833 

14/46  0:03   +2.13++  1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Bxe4 
                       7.Rxf6+ Kg8 8.Nxe6 Qb6+ 9.Qxb6 axb6 
                       10.Nc7 Bd3 11.Rd1 Bc2 12.Nxa8 Bxd1 
                       13.Nxb6 (6.945.392) 1841 

14/47  0:04   +2.12    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Kg8 
                       7.Nxe6 Qb6+ 8.Qxb6 axb6 9.Rxf6 Rac8 
                       10.R1f4 Bd7 11.Ng7 Re7 12.Nh5 Be6 
                       13.a4 Bb3 14.Rd6 (7.534.310) 1858 

15/47  0:05   +2.12    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Kg8 
                       7.Nxe6 Qb6+ 8.Qxb6 axb6 9.Rxf6 Rac8 
                       10.R1f4 Bd7 11.Ng7 Re7 12.Nh5 Be6 
                       13.a4 Bb3 14.Rd6 (9.608.024) 1883 

16/47  0:07   +2.12    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Kg8 
                       7.Nxe6 Qb6+ 8.Qxb6 axb6 9.Rxf6 Rac8 
                       10.R1f4 Bd7 11.Ng7 Re7 12.Nh5 Be6 
                       13.a4 Bb3 14.Rd6 (13.498.347) 1906 

17/47  0:14   +2.23++  1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Kg8 
                       7.Nxe6 Qb6+ 8.Qxb6 axb6 9.Rxf6 Rac8 
                       10.R1f4 Bd7 11.Ng7 Re7 12.Nh5 Be6 
                       13.a4 Bb3 14.Rd6 (27.715.239) 1904 

17/51  0:20   +2.35++  1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 gxf5 
                       4.Rxf5 Nd7 5.Bxf6 Nxf6 6.Rbf1 Kg8 
                       7.Nxe6 Qb6+ 8.Qxb6 axb6 9.Rxf6 Rac8 
                       10.R1f4 Bd7 11.Ng7 Re7 12.Nh5 Be6 
                       13.a4 Bb3 14.Rd6 (39.527.638) 1902 

17/69  0:36   +2.41    1.Bxf7+ Kxf7 2.Qb3+ e6 3.f5 Kg8 
                       4.Bxf6 Nd7 5.Nxc6 bxc6 6.fxg6 Nxf6 
                       7.Rxf6 Rab8 8.Rxe6 Rxb3 9.Rxe8+ Kg7 
                       10.axb3 hxg6 11.Kh1 Qg3 12.Ra1 Qxc3 
                       13.Rxa7+ Kh6 14.Rb7 (70.302.245) 1923 

best move: Bc4xf7 time: 0:37.331 min  n/s: 1.926.234  nodes: 71.788.825 

[jdart]

Arasan 12.2 on a slow quad:

"Leitao-El Debs, Brazilian Chess Championship 2010" bm Bxf7+
0 0.04 Nxc6 +0.28 26812
0 0.04 Bxf6 +0.68 27000
1 0.04 Bxf6 +0.40 27005
1 0.04 Qb3 +0.72 27053
2 0.04 Qb3 +0.72 27059
3 0.04 Qb3 +0.72 27113
4 0.04 Qb3 +0.76 29513
5 0.06 Qb3 +0.72 38567
6 0.09 Qb3 +1.12 56791
7 0.10 Qb3 +1.28 103477
8 0.14 Qb3 +1.28 168303
9 0.21 Qb3 +1.16 313651
10 0.48 Qb3 +1.24 767443
11 0.75 Qb3 +1.32 1269981
12 1.32 Qb3 +1.31 2351340
13 2.65 Qb3 +1.12 5083045
14 9.17 Qb3 +1.35 18743950
15 15.87 Qb3 +1.35 32605832
16 30.90 Qb3 +1.06 62075174
16 124.95 f5 +1.38 254516725
17 163.32 f5 +1.40 329944029
17 217.09 Bxf7+! +1.88 441326656
17 266.03 Bxf7+ +2.50 533884673
2.00M nodes/second.
0 tablebase probes, 0 tablebase hits
3556 splits, average thread usage=3.93
result: Bxf7+ score: +2.50 ++ solved in 217.09 sec. (441.33M nodes)

Bxf7+ Kxf7 Qb3+ e6 f5 Kg8