Test Position: Olofson,D - Mokrys,C, WCCC28CT01 ICCF 2008

[perejaslav]

2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - - 0 28

bm Bxh6!

Can your engine find it?

[yanquis1972]

New game
2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - - 0 1

Analysis by Rybka WinFinder 2.2 mp:

1.Nf3 Qe7
+/- (0.81) Depth: 6 00:00:00 17kN
1.Nf3 Qe7 2.Bd2
+/- (0.75) Depth: 7 00:00:00 29kN
1.Nf3 Ba4 2.Ra1 Bc6
+/= (0.37) Depth: 8 00:00:00 83kN
1.c3 Qe7
+/= (0.56) Depth: 8 00:00:00 118kN
1.c3 Qe7 2.Rd1 Qd8 3.Qh4
+/= (0.56) Depth: 9 00:00:00 253kN
1.c3 Qe7 2.Rb1 Rd7 3.Ra1 Rb8
+/= (0.50) Depth: 10 00:00:00 528kN
1.Nb1 Ba4 2.Na3 Qe7 3.Ra1 Bc6 4.Nb5
+/= (0.62) Depth: 10 00:00:00 627kN
1.Nb1 Ba4 2.Na3 Qe7 3.Ra1 Bc6 4.Nb5
+/= (0.43) Depth: 11 00:00:01 731kN
1.Ra1 Qe7 2.Rb1 Qd8 3.Rc1 Qe7 4.Qh4 Qd8
+/= (0.50) Depth: 11 00:00:02 1585kN
1.Ra1 Qe7 2.Rb1 Qd8 3.Rc1 Qe7 4.Qh4 Qd8
+/= (0.50) Depth: 12 00:00:02 1849kN
1.Ra1 Qe7 2.Rb1 Qd8 3.Rc1 Qe7 4.Qh4 Qd8 5.Re1 Rb8
+/= (0.50) Depth: 13 00:00:04 3062kN
1.Ra1 Qe7 2.Rb1 Rb8 3.Qh4 Qd8 4.Ra1 Ra8 5.Rh3 Nd7
+/= (0.50) Depth: 14 00:00:08 5921kN
1.Ra1 Qe7 2.Rb1 Rb8 3.Qh4 Qd8 4.Ra1 Ra8 5.Rd1 Rb8 6.Ra1 Ra8 7.Rd1 Rb8
+/= (0.50) Depth: 15 00:00:17 11813kN
1.Ra1 Qe7 2.Rb1 Rb8 3.Qh4 Qd8 4.Ra1 Ra8 5.Rd1 Rb8 6.Ra1 Ra8 7.Rd1 Rb8
+/= (0.50) Depth: 16 00:00:31 21302kN
1.Ra1 Qe7 2.Rb1 Rb8 3.Qh4 Qd8 4.Re1 Qe7 5.Rf1 Qd8 6.Rc1 Rbc8 7.Re1 Rb8
+/= (0.50) Depth: 17 00:01:11 49795kN
1.Bxh6
+/= (0.53) Depth: 17 00:02:41 49795kN
1.Bxh6
+/= (0.50) Depth: 17 00:02:41 49795kN
1.Bxh6
+/= (0.50) Depth: 17 00:02:41 49795kN
1.Bxh6
+/= (0.50) Depth: 17 00:02:42 49795kN
1.Bxh6 gxh6 2.Qxh6+ Ke7 3.Rg7 Ba4 4.Nf1 Qh8 5.Ne3 Bc6 6.c5 bxc5
+/= (0.53) Depth: 17 00:02:42 113mN

[zullil]

[D]2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - - 0 28

bm Bxh6!

Can your engine find it?

[zullil]

[D]2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - - 0 28

bm Bxh6!

Can your engine find it?

From the lack of replies, I assume that very few engines are finding Bxh6.

Here's what Stockfish-1.6.3 (8 threads) gives after many hours. Note that it wants to play Nf3 before playing Bxh6. It's still running, so perhaps I'll update this post later.

Code: Select all

Searching: 2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - -
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     +0.12   00:01      151 Qh4 Ba4 
 3     +0.08   00:01      416 Qh4 Ba4 Nb3 
 4     +0.20   00:01     1420 Qh4 Qe7 c3 Ba4 
 5     +0.20   00:01     2329 Qh4 Qe7 Rd1 Ba4 Nb3 
 6     +0.24   00:01     6955 Qh4 Ba4 Ra1 Bc6 c3 Kg8 
 7     +0.32   00:01    10834 Qh4 Ba4 Ra1 Bc6 c3 Bd7 Nf3 
 8     +0.28   00:01    17671 Qh4 Ba4 Ra1 Bc6 c3 Qe7 Re1 Kg8 Ra1 
 9     +0.32   00:01    35431 Qh4 Ba4 Ra1 Bc6 c3 Qe7 Bc2 Qd8 Rd1 Kg8 
10     +0.32   00:01    65308 Qh4 Ba4 Ra1 Bc6 c3 Qe7 Bc2 Qd8 Re1 Qe7 Rd1 Kg8 
11  <  +0.12   00&#58;01   131476 Qh4 Ne8 Qxd8 Rxd8 c3 Nef6 
11     +0.28   00&#58;01   299363 Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Qh4 Qe7 Ra1 Bc6 Be2 
12     +0.28   00&#58;01   565016 Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Qh4 Qe7 Ra1 Bc6 c3 Qd8 
                              Re1 Qe7 Nb3 Ng5 Bxg5 hxg5 Qxg5 
13     +0.28   00&#58;01   889448 Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Qh4 Qe7 Ra1 Bc6 Re1 Ba4 
                              Rd1 Bc6 c3 Ba4 Ra1 Bc6 Bc2 Qd8 Re1 Bd7 Rd1 Kg8 
                              Bxh6 
14     +0.28   00&#58;01    1351k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Qh4 Qe7 Ra1 Bc6 Rb1 Qd8 
                              Re1 Ba4 Ra1 Bc6 c3 Qe7 Bc2 Qd8 Re1 Bd7 Rd1 Kg8 
                              Bxh6 
15     +0.28   00&#58;01    2992k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Qe7 Bc2 Qd8 
                              Qh4 Bd7 Rd1 Kg8 Bxh6 
16     +0.28   00&#58;02    5464k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ra8 Ra1 Rb8 
                              Qh4 Ne8 Qg4 Nhf6 Qh4 Qc8 
17     +0.28   00&#58;02    7838k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ra8 Ra1 Rb8 
                              Qh4 Rbc8 Rb1 Qe7 Bc2 Kg8 Ra1 Kf8 Qh3 Qd8 Qh4 Ra8 
                              Re1 Qc8 Ra1 Qd8 
18     +0.28   00&#58;03   11764k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ra8 Ra1 Rb8 
                              Qh4 Rbc8 Re1 Qe7 Rd1 Ba4 Ra1 Bd7 c5 bxc5 Bc4 Bc6 
19     +0.28   00&#58;04   23637k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ba8 Rb1 Bc6 
                              Ra1 Ba8 Rc1 Qe7 Rb1 Bc6 Ra1 Ba8 Qh4 b5 Bc2 bxc4 
                              Rb1 Bc6 Nxc4 Nxe4 
20     +0.28   00&#58;06   37650k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ba8 Rb1 Bc6 
                              Ra1 Ba8 Ra2 Bc6 Qh4 Qe8 Kh1 Qd8 Nf3 
21     +0.28   00&#58;10   64365k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ba8 Rb1 Bc6 
                              Ra1 Ba8 Qh4 Bc6 Rc1 Ne8 Nf3 Nef6 Re1 Bxe4 Bxe4 
                              Rxc4 
22     +0.32   00&#58;20  145896k Rb1 Ba4 Ra1 Bc6 Rd1 Ba4 Re1 Bc6 c3 Ba8 Rb1 Bc6 
                              Bc2 Qe7 Rb2 Bd7 Qh4 d5 c5 bxc5 exd5 Nxd5 
23  <  +0.12   01&#58;58  921544k Rb1 Ba4 Re1 Qd7 Qh4 b5 cxb5 Bxb5 c4 Bxa6 Ra1 Qc6 
                              Ra2 Rb7 Kh1 Rcb8 Ra1 Rc8 Be2 Rcc7 
24     +0.16   06&#58;16    2908M Rb1 Ba4 Ra1 Bc6 Ra2 Qd7 Rb2 Qe7 c3 Qd7 Qh4 Qd8 
                              Rb4 Ne8 Qh3 Nef6 Bc2 Qd7 Qh4 Qd8 Rb1 Ne8 Qh3 Nef6 
                              Qh4 
25     +0.12   08&#58;16    3843M Rb1 Ba4 Ra1 Bc6 Rf1 Ba4 c3 Qd7 Rb1 Bc6 Rb2 Qd8 
                              Ra2 Qd7 Bc2 b5 c5 Ba8 c4 bxc4 Ba4 Qd8 Bxh6 gxh6 
                              Qxh6+ Ke7 Nxc4 Rxc5 
26     +0.00   23&#58;47   11086M Rb1 Ba8 Ra1 Qd7 Qh4 Qd8 Qh3 
27     +0.00   53&#58;08   25001M Rb1 Ba8 Ra1 Qd7 Qh4 Qd8 Qh3 
28     +0.00 1&#58;06&#58;08   31145M Rb1 Ba8 Ra1 Qd7 Qh4 Qd8 Qh3 
29  <  -0.20 4&#58;12&#58;39  119973M Rb1 Ba4 
29  >  +0.20 7&#58;40&#58;15  220901M Nf3 Qe7 Bxh6 gxh6 Qxh6+ Ke8 Rg7 Kd8 g4 Nf8 c5 
                              bxc5 Bc4 Bxe4 

[meschle]

Rybka 3 dynamic finds it after 1 min 21 secs

FEN: 2rq1k2/p1r2ppn/Ppbp1n1p/4pP2/2P1P3/3BB1RQ/2PN2PP/4R1K1 w - - 0 1

Rybka 3 Dynamic 1-cpu:
2 00:00 134 8.071 +0.02 c2c3
3 00:00 256 15.420 +0.07 c2c3
4 00:00 475 14.739 +0.04 c2c3
5 00:00 1.089 23.232 +0.10 c2c3 Qd8e7
6 00:00 1.773 37.824 +0.12 c2c3 Qd8e7 Qh3h4
7 00:00 6.593 47.543 +0.12 c2c3 Qd8e7 Qh3h4 Rc8d8
8 00:00 11.826 55.044 +0.09 c2c3 Qd8e7 Qh3h4 Rc8d8 Re1f1
8 00:00 12.872 56.089 +0.12 Re1d1 Qd8e7 Qh3h4 Rc8d8 Rd1b1
9 00:00 19.512 60.730 +0.12 Re1d1 Qd8e7 Qh3h4 Rc8d8 Rd1b1 Rd8c8 Rb1a1 Rc8b8
10 00:00 50.916 70.936 +0.12 Re1d1 Qd8e7 Qh3h4 Rc8d8 Rd1b1 Rd8c8 Rb1a1 Rc8b8
11 00:01 128.607 77.375 +0.12 Re1d1 Bc6a8 Qh3h4 Qd8d7 Rd1a1 Ba8c6 Qh4h3
12 00:03 280.386 82.861 +0.12 Re1d1 Bc6a8 Qh3h4 Ba8c6 Rd1b1 Nf6e8 Qh4g4 Nh7f6 Qg4e2
13 00:06 546.387 88.753 +0.12 Re1d1 Bc6a8 Qh3h4 Ba8c6 Rd1b1 Nf6e8 Qh4h3 Nh7f6 Rb1a1 Nf6d7
14 00:11 1.041.917 93.548 +0.12 Re1d1 Bc6a8 Qh3h4 Ba8c6 Rd1b1 Nf6e8 Qh4h3 Nh7f6 Rb1a1 Nf6d7 Qh3g4
15 00:30 2.779.666 93.757 +0.08 Re1d1 Bc6a8 Qh3h4 Nf6e8 Qh4g4 Nh7f6 Qg4h3 Qd8d7 Rd1a1 Rc8d8 Qh3h4 Rc7c8
15 01:21 6.920.097 87.151 +0.24 Be3xh6 g7xh6 Qh3xh6+
16 01:43 8.837.143 87.942 +0.24 Be3xh6 g7xh6 Qh3xh6+ Kf8e8 Rg3g7 Qd8e7 Nd2f3 Ke8d8 c4c5 b6xc5 Bd3c4 Rc8b8
17 02:02 10.503.516 88.108 +0.24 Be3xh6 g7xh6 Qh3xh6+ Kf8e8 Rg3g7 Qd8e7 Nd2f3 Ke8d8 c4c5 b6xc5 Bd3c4 Rc8b8 Re1d1 Kd8e8 Nf3d2 Qe7f8
18 03:47 18.943.899 85.444 +0.19 Be3xh6 g7xh6 Qh3xh6+ Kf8e8 Rg3g7 Qd8e7 Nd2f3 Ke8d8 c4c5 b6xc5 Bd3c4 Rc8b8 Re1d1 Bc6e8 Rg7xh7 Nf6xh7 Qh6xh7 Rb8b4 Nf3d2 Rc7c6 Qh7h8
19 08:53 45.754.535 87.822 +0.28 Be3xh6 g7xh6 Qh3xh6+ Kf8e8 Rg3g7 Bc6a4 Rg7xh7 Nf6xh7 Qh6xh7 Qd8g5 Nd2f3 Qg5f6 Qh7h5 Rc7xc4 Bd3xc4 Rc8xc4 Qh5g4 Ke8d7 Nf3g5 Rc4xc2 h2h4 Kd7e8 Re1b1 Qf6h6 Qg4g3 Rc2c4
20 13:10 68.366.755 88.614 +0.28 Be3xh6 g7xh6 Qh3xh6+ Kf8e8 Rg3g7 Bc6a4 Rg7xh7 Nf6xh7 Qh6xh7 Qd8g5 Nd2f3 Qg5f6 Qh7h5 Rc7xc4 Bd3xc4 Rc8xc4 Qh5g4 Ke8d7 Nf3g5 Rc4xc2 h2h4 Kd7e8 Re1b1 Qf6h6 Qg4g3 Rc2c4

[Marek Soszynski]

From the lack of replies, I assume that very few engines are finding Bxh6.

Indeed. On my system WinFinder finds it first, followed by Rybka Dynamic, and the rest (Zappa, HIARCS, Shredder, Spark...) are still looking.

[rlsuth]

Rybka 3 finds it pretty quickly but even at depth 27, doesn't see much of an advantage.