test position

[Ron Murawski]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

[Terry McCracken]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

Who were the players?

[Marc MP]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

SlowChess 2.1 picks on it quickly and gives some advantage for white:

Code: Select all

SlowChess Blitz WV2.1  (190 MB hash) PIV 2.4 Ghz
FEN: r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

[17] 0.44   39:38.3	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 Bg5 Bxg5 Qxg5 Qxg5 hxg5 Ne7 Re8 Nf5 Bxf5 Rxf5 Ne6 Rf7 b6 
[16] 0.48   15:35.7	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 Bg5 Bxg5 Qxg5 Qxg5 hxg5 Ne7 Re8 Nf5 Bxf5 Rxf5 Ne6 Rf7 
[15] 0.48   07:10.1	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 Bg5 Bxg5 Qxg5 Qxg5 hxg5 h3 Nd7 Ne7 Re8 Nd5 Bxd5 cxd5 
[14] 0.48   03:57.5	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 <tt>
[13] 0.44   01:09.2	Nd5 Rxf3 gxf3 Qd8 Rg1 g5 c4 Rc8 f4 exf4 Bxf4 Bf6 Nxf6 Nxf6 Bxd6 Bxc4 
[12] 0.44   00:48.9	Nd5 Rxf3 gxf3 Qd8 Rg1 g5 c4 Rc8 f4 exf4 Bxf4 Bf6 Nxf6 Nxf6 Bxd6 Bxc4 
[11] 0.20   00:21.2	Nd5 Bxd5 exd5 Bg5 Bxh7 Bxc1 Bf5 Bg5 h4 Bf4 Qg6 Kg8 
[11] 0.04   00:19.5	Nd5 {++}
[11] 0.04   00:15.8	Qg6 Rxf3 gxf3 Nf8 Qh5 Qc6 Be3 Rc8 Rg1 Bf6 a4 
[10] 0.08   00:05.5	Qg6 Rxf3 Qxe6 Rxd3 cxd3 Bg5 b4 Qc6 Ne2 Rf8 
[9]  0.20   00:02.4	Qg6 Rxf3 Qxe6 Rxd3 cxd3 Bg5 b4 Qd4 Bxg5 Nxg5 
[8]  0.36   00:01.0	Qg6 Rf6 Rxf6 Nxf6 Nd5 Bxd5 exd5 Rf8 Bf5 
[7]  0.32   00:00.6	Qg6 Rf6 Rxf6 Nxf6 Nd5 Bxd5 exd5 Rf8 
[7]  0.04   00:00.5	Qg6 {++}
[7]  0.04   00:00.2	Nd5 Bxd5 exd5 Bg5 Rxf8+ Rxf8 Bxg5 Nxg5 h4 Nf7 
[6]  0.32   00:00.0	Nd5 Bxd5 exd5 Ng5 Rff1 Bf6 
[5]  0.40   00:00.0	Nd5 Bxd5 exd5 Ng5 Rff1 
[4]  0.40   00:00.0	Nd5 Bxd5 exd5 Nf6 
[3]  0.32   00:00.0	Nd5 Rxf3 Qxf3 
[2]  0.32   00:00.0	Nd5 Rxf3 Qxf3 

[Ron Murawski]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

Who were the players?

I extended an opening line and stumbled onto this position by accident. I have no idea if it has ever been played over the board.

Ron

[Terry McCracken]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

Who were the players?

I extended an opening line and stumbled onto this position by accident. I have no idea if it has ever been played over the board.

Ron

Ah...I see, very good Ron, thanks!

Terry

[Ron Murawski]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

SlowChess 2.1 picks on it quickly and gives some advantage for white:

Code: Select all

SlowChess Blitz WV2.1  (190 MB hash) PIV 2.4 Ghz
FEN: r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

[17] 0.44   39:38.3	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 Bg5 Bxg5 Qxg5 Qxg5 hxg5 Ne7 Re8 Nf5 Bxf5 Rxf5 Ne6 Rf7 b6 

I agree with this part of the pv
Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8
but after that move, I think Be3 is stronger than c4. Kg1 might be playable as well.

I think there's enough advantage for white to eventually win the game, but not in an outright manner. If you advance through the SlowChess pv up to the suspect move, you will see many other engines have almost a full pawn advantage for the white side.

Ron

[Marc MP]

[d]r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

Nd5!

This move may be difficult to find.

Ron

SlowChess 2.1 picks on it quickly and gives some advantage for white:

Code: Select all

SlowChess Blitz WV2.1  (190 MB hash) PIV 2.4 Ghz
FEN: r4r1k/1p2b1pn/pq1pb2p/4p3/4P3/P1NB1RQ1/1PP3PP/2BR3K w - -

[17] 0.44   39:38.3	Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8 c4 Bg5 Bxg5 Qxg5 Qxg5 hxg5 Ne7 Re8 Nf5 Bxf5 Rxf5 Ne6 Rf7 b6 

I agree with this part of the pv
Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8
but after that move, I think Be3 is stronger than c4. Kg1 might be playable as well.

I think there's enough advantage for white to eventually win the game, but not in an outright manner. If you advance through the SlowChess pv up to the suspect move, you will see many other engines have almost a full pawn advantage for the white side.

Ron

Thank you for the comments. I advanced the line up to Nd5 Qd8 Rxf8+ Nxf8 Rf1 Rc8, but SlowChess sticks on c4. At this point ChessTiger 2007.1 plays Be3 with an eval of around 0.8-0.9 favoring white. Strangely Rybka Beta wants to play b4 here for white.

BTW: For your next update of computer-chess.org: there is an updated version of EPD2WB by Thomas Mayer which adds many useful new switches as well as support for uci engines. You can find the references in this thread: http://www.vpittlik.org/wbforum/viewtop ... 377&t=2613

Regards,

Marc