23.Qxh6!

[Jack Lad]

[d] r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - 0 23
How long does it take your engine to play it?
http://www.chessgames.com/perl/chessgame?gid=1124284

[Dr.Wael Deeb]

With the g7 pawn pinned with the white rock on g1,I don't think that it's a hard move to find by the engines....
Dr.D

[Terry McCracken]

With the g7 pawn pinned with the white rock on g1,I don't think that it's a hard move to find by the engines....
Dr.D

I think a lot of engines will play 23. Bb3!? instead. Although 23. Qxh6!!..Qxc4 24. Rxg7+!!..Nxg7 25. Ng5!!..Re8 26. Rg1!! is devestating for Black.

Test it.

[kgburcham]

Here is a commercial program that finds this position quickly with default settings.

[d] r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - 0 23

23.Qxh6
+- (2.44) Depth: 15/40 00:00:29 43721kN
23.Qxh6
+- (2.91) Depth: 15/40 00:00:32 47803kN
23.Qxh6 Qxc4 24.Qh5 Rf7 25.Rd8 Qc6 26.Nd4 Qd7 27.Rxd7 Bxd7 28.h4 Rd8 29.Nf3 f4 30.Ne4 Rf5 31.Nfg5 f3 32.Qh7+
+- (3.43) Depth: 15/41 00:00:35 52099kN
23.Qxh6
+- (3.68) Depth: 16/41 00:00:46 68637kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7
+- (4.93) Depth: 16/45 00:01:20 123mN
23.Qxh6
+- (5.18) Depth: 17/45 00:01:37 150mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 h5 32.Rd7 Be6
+- (5.18) Depth: 17/45 00:01:42 159mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Kh7 33.Rf6
+- (5.39) Depth: 18/45 00:02:17 215mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Ng8 33.Rc6 Bf7
+- (5.41) Depth: 19/53 00:03:44 353mN

[Dr.Wael Deeb]

With the g7 pawn pinned with the white rock on g1,I don't think that it's a hard move to find by the engines....
Dr.D

I think a lot of engines will play 23. Bb3!? instead. Although 23. Qxh6!!..Qxc4 24. Rxg7+!!..Nxg7 25. Ng5!!..Re8 26. Rg1!! is devestating for Black.

Test it.

The engine will play 23. Bb3 if it's too materialistic and weak of course....the attacking opportunity for white is scarey to say the least....
Dr.D

[kgburcham]

Just a little quicker. This is also with default settings.

[d] r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - 0 1

23.Qxh6
+- (2.94) Depth: 15/42 00:00:19 29011kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 f4 28.Rd8
+- (5.02) Depth: 15/56 00:00:41 66220kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6
+- (5.27) Depth: 16/56 00:00:47 76593kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bg8 30.Rd7 Re8 31.Rxb7
+- (5.37) Depth: 17/56 00:00:59 96918kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Ng8 33.b3 Bf7 34.Rb7 Ne7 35.Ra7
+- (5.42) Depth: 18/56 00:01:30 149mN
23.Qxh6
+- (5.67) Depth: 19/56 00:02:22 235mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Kh7 33.Rf6 a5 34.e6
+- (5.83) Depth: 19/56 00:02:59 295mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Kh7 33.Rf6 Nd5 34.Rf7+ Kh8 35.Nxd5 Bxd5 36.Rxf5 a5 37.Rf6 Kh7 38.Re1
+- (5.88) Depth: 20/56 00:05:45 577mN

[Terry McCracken]

With the g7 pawn pinned with the white rock on g1,I don't think that it's a hard move to find by the engines....
Dr.D

I think a lot of engines will play 23. Bb3!? instead. Although 23. Qxh6!!..Qxc4 24. Rxg7+!!..Nxg7 25. Ng5!!..Re8 26. Rg1!! is devestating for Black.

Test it.

The engine will play 23. Bb3 if it's too materialistic and weak of course....the attacking opportunity for white is scarey to say the least....
Dr.D

Like Hiracs 11 or Rybka 2?

[Terry McCracken]

Here is a commercial program that finds this position quickly with default settings.

[d] r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - 0 23

23.Qxh6
+- (2.44) Depth: 15/40 00:00:29 43721kN
23.Qxh6
+- (2.91) Depth: 15/40 00:00:32 47803kN
23.Qxh6 Qxc4 24.Qh5 Rf7 25.Rd8 Qc6 26.Nd4 Qd7 27.Rxd7 Bxd7 28.h4 Rd8 29.Nf3 f4 30.Ne4 Rf5 31.Nfg5 f3 32.Qh7+
+- (3.43) Depth: 15/41 00:00:35 52099kN
23.Qxh6
+- (3.68) Depth: 16/41 00:00:46 68637kN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7
+- (4.93) Depth: 16/45 00:01:20 123mN
23.Qxh6
+- (5.18) Depth: 17/45 00:01:37 150mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 h5 32.Rd7 Be6
+- (5.18) Depth: 17/45 00:01:42 159mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Kh7 33.Rf6
+- (5.39) Depth: 18/45 00:02:17 215mN
23.Qxh6 Rf7 24.Ng5 gxh6 25.Nxe6+ Kh7 26.Nxc7 Nxc7 27.Bxf7 Ne6 28.Bxe6 Bxe6 29.Rd6 Bc4 30.Rd7 Re8 31.Rxb7 Kh8 32.Rb6 Ng8 33.Rc6 Bf7
+- (5.41) Depth: 19/53 00:03:44 353mN

Which commercial program? What Hardware? The data is useless unless we have more information.

But I'll guess it's Rybka 3 MP

[kgburcham]

Which commercial program? What Hardware? The data is useless unless we have more information.

But I'll guess it's Rybka 3 MP

[d] r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - 0 23

Not sure how much hash is used,
Hash control is AUTO only, varies as needed.
Not sure how many CPUs used, this is also managed by the program.
Not sure about eval, this release only gives best move.
not sure about depth, no depth given by program.

this program only gives bm, time and score. Man, this programmer is really concerned about the other programmers copying his original from scratch hard work.

Yes Terry I agree, this data is useless without more info, I think I will put this program back on the shelf and start using Gambit Tiger again, maybe Shredder 4, I might even go back to my wallmart copy of chessmaster.

2:39 +3.87++ 23.Qxh6
2:56 +4.67++ 23.Qxh6
5:25 +4.87 23.Qxh6

[Dr.Wael Deeb]

With the g7 pawn pinned with the white rock on g1,I don't think that it's a hard move to find by the engines....
Dr.D

I think a lot of engines will play 23. Bb3!? instead. Although 23. Qxh6!!..Qxc4 24. Rxg7+!!..Nxg7 25. Ng5!!..Re8 26. Rg1!! is devestating for Black.

Test it.

The engine will play 23. Bb3 if it's too materialistic and weak of course....the attacking opportunity for white is scarey to say the least....
Dr.D

Like Hiracs 11 or Rybka 2?

If they play 23. Bb3 in this position,then yes,they are weak in this position
Just take a good look at the position,a perfect conditions for white to start a massive king side attack at the black king....retreating the bishop in this position is definitely wrong....