Sac of the day

Tord Romstad · Post by **Tord Romstad** » Wed May 07, 2008 9:43 pm

Here's an example of Glaurung's new king safety in action:

[d]r1b2rk1/1pq3pp/p1nbp3/3p3n/3P4/2NBBN1P/PP3PP1/R2Q1RK1 w - -

Glaurung played 15. Bxh7+?!

It is difficult for me to believe that this is sound, although it gives some practical chances (as is demonstrated by the fact that my program went on to win the game). When I let my program analyse the position for 10 minutes, Bxh7 remained the top move, with a declining, but always positive score.

Do any other programs like Bxh7? Is it sound?

Glaurung's analysis:

Code: Select all

 2     +1.49   00:00      542 Bxh7+ Kxh7 Ng5+ Kh6 
 3     +2.00   00:00     1267 Bxh7+ Kxh7 Ng5+ Kg6 g3 
 4     +1.84   00:00     2812 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Bh2+ Kh1 
 5     +1.90   00:00     5504 Bxh7+ Kxh7 Ng5+ Kg6 g3 Be7 Qg4 
 6     +1.41   00:00    13578 Bxh7+ Kxh7 Ng5+ Kg6 Kh1 Rf5 Qg4 Kh6 
 7     +1.08   00:00    39208 Bxh7+ Kxh7 Ng5+ Kg6 g3 Rf5 Qg4 Nf6 Qh4 
 8     +1.63   00:00    70121 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Qb6 Ne2 Qxb2 
 9     +1.61   00:00   126476 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Nh5 Kh1 Bf4 Qg4 
10     +1.39   00:00   450182 Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf4 g3 Kh6 Rc1 Bd7 gxf4 
                              Bxf4 Bxf4 Qxf4 
11     +1.08   00:00    1147k Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf6 Qd3+ Kh5 Nf3 Bf4 g3 
                              Bxe3 Qxe3 Kg6 Ne2 
12     +1.16   00:01    2514k Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf6 Qd3+ Kh5 Nf3 Bf4 Bxf4 
                              Qxf4 Ne2 Qg4 Ng3+ Kh6 Rac1 
13     +0.94   00:03    5456k Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Ne7 g4 Bh2+ Kh1 
                              Bf4 Rac1 Bxg5 Qxg5+ Kh7 Nxd5 
14     +0.51   00:06   12030k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Qxe6 Bxe6 Nxe6+ Kd7 Nxc7 Bxc7 Nxd5 
15     +0.35   00:17   32992k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Qxe6 Bxe6 Nxe6+ Kd7 Nxc7 Bxc7 Nxd5 Nf6 
16     +0.43   00:38   75592k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Nxe6+ Bxe6 Qxe6 Qd7 Qxd5 Nf6 Qg2 Nb4 Rad1 Rc8 
                              d5 
17     +0.33   01:48  217065k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 Re1 Bh2+ Kf1 Nb4 g3 e5 
                              Rc1 Qc4+ Ne2 Qd3 dxe5 Bxg3 Qa4 Bxh4 Qxb4 Bxg5 
                              Bxg5 Kxg5 
18     +0.53   03:26  418025k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 Re1 Bh2+ Kf1 Nb4 g3 e5 
                              Rc1 Qc4+ Ne2 Qd3 dxe5 Bxg3 Qa4 a5 Rc7 Kh6 
19     +0.39   07:25  903787k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Kg6 Rae1 
                              Bxg3 Qg2 Bh2+ Kh1 Kf6 Nxe6 Bxe6 Bg5+ Kf7 Rxe6 Qd7 
                              Rfe1 Kg8 Kxh2 Nxd4 Qxd5 Qxd5 Nxd5 Nxe6 Rxe6

Tord

genorb · Post by **genorb** » Thu May 08, 2008 12:33 am

Hash 32Mb, single processor, 32 bits

I analyzed (2 best moves) the position you mentionned but also the position that comes after

1. Bxh7+ Kxh7 2. Ng5+ Kg6

Position 1

[d]r1b2rk1/1pq3pp/p1nbp3/3p3n/3P4/2NBBN1P/PP3PP1/R2Q1RK1 w - -

Position 2

[d]r1b2r2/1pq3p1/p1nbp1k1/3p2Nn/3P4/2N1B2P/PP3PP1/R2Q1RK1 w - -

Rybka gives only a small advantage to black in position 2, so this is not so bad since white gave a bishop for a pawn, but this doesn't look winning at all for white. Comparison between position 1 and 2 shows that 1. Bxh7+ leads to a worse position even if this is not completely losing. Of course 1.Bxh7+ could be the start of a very clever sequence of moves that none of the following engines are able to find, this would not be the first time...

Hiarcs 12.0

Position 1

14 3:15 0.00 1.Re1 Nf4 2.Bxf4 Rxf4 3.Rc1 Qd8 4.Na4 Bb4 5.Re3 (43.973.605) 224
14 3:15 -0.05 1.Ng5 g6 2.Bc2 Ng7 3.Nf3 Nf5 4.Bg5 Bd7 5.Qd2 Rac8 6.Rae1 Nb4 (43.973.605) 224

Position 2

14 5:19 -0.50 3.Qc2+ Kf6 4.Qh7 Nf4 (73.390.600) 229
14 5:19 -0.75 3.Qd3+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qg6 Qf7 7.Qh7 b5 8.a4 b4 9.Ne2 Bb7 10.Bg5 Nf6 11.Qh8+ Ke7 12.Qh4 Rc8 13.Bf4 (73.390.600) 229

Rybka 2.3.2a

Position 1

13 1:23 +0.20 1.Rc1 Nf4 2.Bc2 Qe7 3.h4 Nb4 4.Bb1 g6 5.a3 Nc6 (4.461.725) 54
13 2:00 +0.15 1.Ng5 g6 2.Re1 Nf4 3.Bf1 Qd8 4.h4 h6 5.Nf3 Qb6 (6.252.858) 52

Position 2

16 3:10 -0.16 3.Qd3+ Kf6 4.Qh7 g6 5.g4 Qxh7 6.Nxh7+ Kg7 7.Nxf8 Nf4 8.Bxf4 Bxf4 9.Nxg6 Kxg6 (12.678.584) 68
16 3:28 -0.16 3.Qb1+ Kf6 4.Qh7 g6 5.g4 Qxh7 6.Nxh7+ Kg7 7.Nxf8 Nf4 8.Bxf4 Bxf4 9.Nxg6 Kxg6 (13.897.585) 68

Shredder 11

Position 1

14 2:04 +0.19 1.Tc1 Cf4 2.Fb1 h6 3.Ca4 Tf6 4.Ch4 Fd7 5.Dc2 g6 6.a3 Tc8 7.Cc5 Rh7 8.Dd2 (54.777.793) 440
14 2:11 -0.04 1.Dc2 g6 2.Ce2 Txf3 3.gxf3 Df7 4.Rg2 Fd7 5.Db3 Cb4 (58.290.824) 442

Position 2

14 1:31 -0.91 3.Qd3+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Kf7 8.Rac1 Qd8 9.Qh4 Bd7 10.Ne2 Qb6 11.b3 Kg8 12.Rfd1 (47.188.214) 514
14 1:46 -0.91 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Kf7 8.Rac1 Qd8 9.Qh4 Bd7 10.Ne2 Qb6 11.b3 (54.842.740) 516

Rybka Winfinder 2.2

Position 1

12 1:31 +0.18 1.Ng5 g6 2.Rc1 Nf4 3.Bc2 h6 4.Nf3 Qb6 (4.987.707) 56
12 1:33 +0.06 1.Ne5 Nf4 2.Bxf4 Rxf4 (5.132.886) 55

Position 2

13 3:23 -0.55 3.Qd3+ Kf6 4.Nh7+ Kf7 5.Ng5+ Ke7 6.Qh7 Nf6 7.Qxg7+ Kd8 8.Qh6 Qe7 (11.210.313) 56
13 3:04 -0.61 3.Qb1+ Kf6 4.Nh7+ Kf7 5.Ng5+ Ke7 6.Qh7 Nf6 7.Qxg7+ Kd8 8.Qh6 Qe7 (10.124.455) 56

michiguel · Post by **michiguel** » Thu May 08, 2008 12:53 am

Tord Romstad wrote:Here's an example of Glaurung's new king safety in action:

[d]r1b2rk1/1pq3pp/p1nbp3/3p3n/3P4/2NBBN1P/PP3PP1/R2Q1RK1 w - -

Glaurung played 15. Bxh7+?!

It is difficult for me to believe that this is sound, although it gives some practical chances (as is demonstrated by the fact that my program went on to win the game). When I let my program analyse the position for 10 minutes, Bxh7 remained the top move, with a declining, but always positive score.

Do any other programs like Bxh7? Is it sound?

Glaurung's analysis:
Code: Select all
 2     +1.49   00:00      542 Bxh7+ Kxh7 Ng5+ Kh6 
 3     +2.00   00:00     1267 Bxh7+ Kxh7 Ng5+ Kg6 g3 
 4     +1.84   00:00     2812 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Bh2+ Kh1 
 5     +1.90   00:00     5504 Bxh7+ Kxh7 Ng5+ Kg6 g3 Be7 Qg4 
 6     +1.41   00:00    13578 Bxh7+ Kxh7 Ng5+ Kg6 Kh1 Rf5 Qg4 Kh6 
 7     +1.08   00:00    39208 Bxh7+ Kxh7 Ng5+ Kg6 g3 Rf5 Qg4 Nf6 Qh4 
 8     +1.63   00:00    70121 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Qb6 Ne2 Qxb2 
 9     +1.61   00:00   126476 Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Nh5 Kh1 Bf4 Qg4 
10     +1.39   00:00   450182 Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf4 g3 Kh6 Rc1 Bd7 gxf4 
                              Bxf4 Bxf4 Qxf4 
11     +1.08   00:00    1147k Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf6 Qd3+ Kh5 Nf3 Bf4 g3 
                              Bxe3 Qxe3 Kg6 Ne2 
12     +1.16   00:01    2514k Bxh7+ Kxh7 Ng5+ Kg6 h4 Nf6 Qd3+ Kh5 Nf3 Bf4 Bxf4 
                              Qxf4 Ne2 Qg4 Ng3+ Kh6 Rac1 
13     +0.94   00:03    5456k Bxh7+ Kxh7 Ng5+ Kg6 Qg4 Nf6 Qh4 Ne7 g4 Bh2+ Kh1 
                              Bf4 Rac1 Bxg5 Qxg5+ Kh7 Nxd5 
14     +0.51   00:06   12030k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Qxe6 Bxe6 Nxe6+ Kd7 Nxc7 Bxc7 Nxd5 
15     +0.35   00:17   32992k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Qxe6 Bxe6 Nxe6+ Kd7 Nxc7 Bxc7 Nxd5 Nf6 
16     +0.43   00:38   75592k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Ke7 Qf7+ 
                              Kd8 Nxe6+ Bxe6 Qxe6 Qd7 Qxd5 Nf6 Qg2 Nb4 Rad1 Rc8 
                              d5 
17     +0.33   01:48  217065k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 Re1 Bh2+ Kf1 Nb4 g3 e5 
                              Rc1 Qc4+ Ne2 Qd3 dxe5 Bxg3 Qa4 Bxh4 Qxb4 Bxg5 
                              Bxg5 Kxg5 
18     +0.53   03:26  418025k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 Re1 Bh2+ Kf1 Nb4 g3 e5 
                              Rc1 Qc4+ Ne2 Qd3 dxe5 Bxg3 Qa4 a5 Rc7 Kh6 
19     +0.39   07:25  903787k Bxh7+ Kxh7 Ng5+ Kg6 h4 Rh8 g3 Kf6 Qf3+ Kg6 Rae1 
                              Bxg3 Qg2 Bh2+ Kh1 Kf6 Nxe6 Bxe6 Bg5+ Kf7 Rxe6 Qd7 
                              Rfe1 Kg8 Kxh2 Nxd4 Qxd5 Qxd5 Nxd5 Nxe6 Rxe6 
My engine Gaviota plays Bxh7+ in 0.1 seconds (ply4) with a +1.00 advantage and stays with it for ever. The evaluation goes down to +0.69 but is always positive. To me, it seems to be a very interesting move. I do not believe is winning, but I believe it gives white an advantage.

In this type of positions black many times play Kh8 to play Nh5. Vaganjan introduced it in the 70's. I quit playing competitively in the 80's so, I am not familiar with the theory anymore. In any case, playing Nh5 is just kamikaze. I feel Bxh7+ is correct.

Rusty chess player regards,
Miguel

Tord

rightrook · Post by **rightrook** » Thu May 08, 2008 2:59 am

On my PC.....

Ruffian 1.0.5 finds it in 19 seconds....

regards

Robert

Eelco de Groot · Post by **Eelco de Groot** » Thu May 08, 2008 5:46 am

Hello Tord,

Not related to the sac but I just found the following line, maybe it was already corrected, in pawn.h of Glarung 080422
I just thought I'd quickly mention it, in case it was a genuine bug

Regards, Eelco

Code: Select all

class PawnInfoTable {

public:
  PawnInfoTable(unsigned numOfEntries);
  ~PawnInfoTable();
  void clear();
  PawnInfo* get_pawn_info(const Position& pos);

private:
  unsigned size;
  PawnInfo* entries;
};


////
//// Inline functions
////

inline Value PawnInfo::mg_value() const {
  return Value(mgValue);
}

inline Value PawnInfo::eg_value() const { // EdG: was Value(mgValue)?
  return Value(egValue);

Eelco de Groot · Post by **Eelco de Groot** » Thu May 08, 2008 7:59 am

Latest builds are not so good, but here is output from Build 56:

[d]r1b2rk1/1pq3pp/p1nbp3/3p3n/3P4/2NBBN1P/PP3PP1/R2Q1RK1 w - -

Engine: Glaurung 080422 Mjolnir 006c Build 56 (256 MB)
by Tord Romstad

2.00 0:00 +0.90 1.Ne5 Nf4 (238) 0

2.00 0:00 +4.11 1.Bxh7+ Kxh7 2.Ng5+ Kh6 (591) 2

3.00 0:00 +4.88 1.Bxh7+ Kh8 2.Qc2 Nf4 (1.690) 6

4.00 0:00 +3.90 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Rf5
4.Nf3 (4.076) 15

5.00 0:00 -2.01 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Rf5
4.Nf3 Kf7 (9.063) 32

5.00 0:00 +0.50 1.Ne5 Nf6 2.f4 Bd7 3.Rc1 (18.455) 59

5.00 0:00 +0.66 1.Qc2 Nf6 2.Ng5 g6 3.Nf3 (25.038) 76

6.00 0:00 +0.56 1.Qc2 Nf6 2.Ng5 g6 3.Nf3 Bd7 (32.020) 93

7.00 0:00 +0.25 1.Qc2 Nf6 2.a3 Bd7 3.Bg5 h6 4.Be3 (60.359) 143

7.00 0:00 +0.58 1.Qb1 Nf6 2.Ng5 g6 3.Nf3 b6 4.Bxg6 hxg6
5.Qxg6+ Qg7 (66.621) 152

8.00 0:00 +0.58 1.Qb1 Nf6 2.Ng5 g6 3.Nf3 b6 4.Bxg6 hxg6
5.Qxg6+ Qg7 (107.013) 201

9.00 0:00 -0.15 1.Qb1 g6 2.Bxg6 Nf4 3.Bxf4 Rxf4
4.Ng5 hxg6 5.Qxg6+ Qg7 6.Qe8+ Rf8 (281.845) 286

9.11 0:01 +0.05 1.Rc1 Nf4 2.Bc2 Qd8 3.Bxf4 Rxf4
4.Qd3 Rf5 5.Qd1 Rf7 (678.976) 342

10.01 0:02 +0.05 1.Rc1 Nf4 2.Bc2 Qd8 3.Bxf4 Rxf4
4.Qd3 Rf5 5.Qd1 Rf4 6.Re1 (1.040.184) 356

11.01 0:06 -0.03 1.Rc1 Nf4 2.Bc2 Qd8 3.Bxf4 Bxf4
4.Qd3 g6 5.Rce1 Bd7 6.Qe2 Nb4 (2.662.975) 381

11.03 0:09 0.00 1.Bc2 Nb4 2.Bb1 Nf4 3.Ng5 g6 4.a3 Nc6
5.Bc2 Bd7 6.Re1 (3.697.628) 388

11.11 0:17 +0.01 1.Re1 Nf4 2.Bc2 g6 3.Na4 Nb4 4.Bb1 Bd7
5.Nc5 Rae8 6.Nxd7 Qxd7 (6.844.690) 392

12.01 0:21 0.00 1.Re1 Nf4 2.Bc2 g6 3.Na4 Nb4 4.Bb1 Nc6
5.Bc2 (8.372.894) 393

12.05 0:42 +0.35 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Nf6
4.Qd3+ Kh5 5.f4 Kxh4 6.Bd2 Kh5 7.Nh7 Rf7
8.Ng5 (16.824.728) 399

13.01 1:15 +0.74 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Ke7 6.Nh7+ Ke8
7.Nxf8 Kxf8 8.Qh8+ Kf7 9.g3 Qb6
10.Bxf4 Bxf4 11.gxf4 Nxd4 (30.151.343) 400

14.01 1:30 +0.74 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Ke7 6.Nh7+ Ke8
7.Nxf8 Kxf8 8.Qh8+ Kf7 9.g3 Qb6
10.Bxf4 Bxf4 11.gxf4 Nxd4 (36.312.637) 403

15.01 2:43 +0.82 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Kg6 6.Qg4 Qe7
7.Nxe6+ Kh6 8.Rae1 Nxd4 9.Nxf8 Bxg4
10.Bxf4+ g5 11.Rxe7 Bxe7 (66.007.421) 402

16.01 10:20 +0.15 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Bd7 6.Nge4+ Kg6
7.Qg4+ Kh6 8.Nxd6 Qxd6 9.g3 g5 10.h4 Kh7
11.gxf4 gxf4 (249.727.730) 402

best move: Bd3xh7 time: 11:04.703 min n/s: 403.272 nodes: 268.050.000

Build 66:

r1b2rk1/1pq3pp/p1nbp3/3p3n/3P4/2NBBN1P/PP3PP1/R2Q1RK1 w - -

Engine: Glaurung 080422 Mjolnir 006c Build 66 (256 MB)
by Tord Romstad

2.00 0:00 +0.90 1.Ne5 Nf4 (214) 0

2.00 0:00 +4.11 1.Bxh7+ Kxh7 2.Ng5+ Kh6 (565) 2

3.00 0:00 +4.88 1.Bxh7+ Kh8 2.Qc2 Nf4 (1.661) 6

4.00 0:00 +3.90 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Rf5
4.Nf3 (3.734) 14

5.00 0:00 -2.01 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Rf5
4.Nf3 Kf7 (8.631) 30

5.00 0:00 +0.50 1.Ne5 Nf6 2.f4 Bd7 3.Rc1 (17.697) 56

5.00 0:00 +0.66 1.Qc2 Nf6 2.Ng5 g6 3.Nf3 (23.924) 72

6.00 0:00 +0.56 1.Qc2 Nf6 2.Ng5 g6 3.Nf3 Bd7 (30.856) 89

7.00 0:00 +0.25 1.Qc2 Nf6 2.a3 Bd7 3.Bg5 h6 4.Be3 (59.028) 139

7.00 0:00 +0.58 1.Qb1 Nf6 2.Ng5 g6 3.Nf3 b6 4.Bxg6 hxg6
5.Qxg6+ Qg7 (65.732) 150

8.00 0:00 +0.58 1.Qb1 Nf6 2.Ng5 g6 3.Nf3 b6 4.Bxg6 hxg6
5.Qxg6+ Qg7 (104.741) 197

9.00 0:00 -0.07 1.Qb1 g6 2.Qd1 Nf4 3.Bxf4 Rxf4 4.Rc1 Bd7
5.Ne2 Rff8 (269.331) 282

9.09 0:01 +0.05 1.a3 Nf4 2.Bc2 g6 3.Re1 Qb6 4.b4 Bd7
5.Ne5 Nxe5 6.dxe5 (538.123) 331

9.27 0:03 +0.17 1.Qc2 g6 2.Bxg6 Nf4 3.Bxf4 Rxf4
4.Bh5 Nxd4 5.Nxd4 Rxd4 6.g3 (1.184.462) 361

10.01 0:03 -0.17 1.Qc2 g6 2.Qd1 Nf4 3.Bc2 Qb6 4.Bb3 Bd7
5.Rc1 Rac8 (1.446.530) 367

10.02 0:04 +0.07 1.a3 Nf4 2.Bc2 g6 3.Re1 Qb6 4.b4 Bd7
5.Rc1 Rac8 (1.615.645) 370

11.01 0:06 -0.05 1.a3 Nf4 2.Bc2 Be7 3.Rc1 Bd7 4.Re1 g6
5.Bd3 Nxd3 6.Qxd3 Rac8 (2.448.018) 378

11.03 0:08 0.00 1.Bb1 Bd7 2.Bc2 Rac8 3.Qd3 Rf5 4.Qd1 Rff8 (3.212.455) 382

12.01 0:25 -0.09 1.Bb1 Bd7 2.a3 Nf4 3.Ng5 g6 4.Qg4 h5
5.Qh4 Nxg2 6.Kxg2 Rf6 (9.818.938) 392

12.03 0:31 +0.31 1.Ne5 Nf6 2.f4 b5 3.g3 Bb7 4.Kg2 Rac8
5.Re1 Qb6 6.Bc2 Nxe5 7.dxe5 (12.413.823) 394

13.01 0:51 +0.37 1.Ne5 Nf6 2.f4 b5 3.g4 Nb4 4.Be2 Qb6
5.a4 Bd7 6.Nxd7 Nxd7 7.Kg2 bxa4
8.Qxa4 (20.706.053) 399

14.01 1:49 -0.41 1.Ne5 Nf4 2.Bxf4 Rxf4 3.Nxc6 bxc6
4.Ne2 Rf7 5.Qc2 g6 6.Rac1 Bb7 7.f4 Raf8
8.g3 Qa5 (44.302.414) 405

14.02 3:35 +0.03 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Rh8
4.g3 Ne7 5.Qd3+ Nf5 6.g4 Nf6 7.gxf5+ exf5
8.Nf3 Kh7 9.Ne5 Bxe5 10.dxe5 Qxe5 (86.826.028) 403

15.01 6:19 +0.62 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Rh8
4.g3 Ne7 5.Qd3+ Nf5 6.g4 Nf6 7.gxf5+ exf5
8.Nf3 Kh7 9.Bg5 Kg8 10.Bxf6 gxf6
11.Nxd5 (151.361.479) 399

16.01 10:56 0.00 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Ng6 6.Qh5 Rh8 7.Nh7+ Kf7
8.Ng5+ Kf6 (260.877.408) 397

17.01 21:38 0.00 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qd3+ Kf6
4.Qh7 Nf4 5.Qh4 Ng6 6.Qh5 Rh8 7.Nh7+ Kf7
8.Ng5+ Kf6 (521.752.641) 401

best move: Bd3xh7 time: 29:22.516 min n/s: 404.020 nodes: 712.080.000

I hope I can find out why this is worse...

Eraserheads · Post by **Eraserheads** » Thu May 08, 2008 11:03 am

I am going to love this engine! =) Keep it coming!

genorb · Post by **genorb** » Thu May 08, 2008 11:06 am

rightrook wrote:On my PC.....

Ruffian 1.0.5 finds it in 19 seconds....

regards

Robert

Yes but soon after Ruffian change its minds

5/15 0:00 +0.56 1.Ng5 Nf6 2.Qc2 h6 3.Bh7+ Kh8 (43.342) 309
6/17 0:00 +0.22 1.Ng5 Nf6 2.Re1 Bf4 3.Qa4 Kh8 4.Bxf4 Qxf4 (104.531) 373
6/17 0:00 +0.32 1.Re1 Nf4 2.Ng5 h6 3.Bxf4 Rxf4 4.Bh7+ Kh8 (167.791) 479
7/25 0:00 +0.26 1.Re1 Nf4 2.Ng5 Nxd3 3.Qxd3 Rf5 4.Bd2 Qe7 (336.899) 687
7/25 0:00 +0.31 1.Ng5 Nf6 2.Rc1 e5 3.dxe5 Bxe5 4.Re1 Nd4 (520.886) 789
8/25 0:01 +0.25 1.Ng5 Nf6 2.Rc1 Bd7 3.Re1 Bf4 4.Qa4 Rac8 5.Bxf4 Qxf4 (1.263.517) 1010
9/28 0:04 +0.28 1.Ng5 g6 2.Re1 Bh2+ 3.Kh1 Bf4 4.Nf3 Bd7 5.Rc1 Rac8 6.Bxf4 Nxf4 (5.031.970) 1091
10/28 0:10 +0.19 1.Ng5 g6 2.Re1 Nf4 3.Rc1 Qg7 4.Nf3 Bd7 5.Kh1 Nxd3 6.Qxd3 (11.248.078) 1124
10/28 0:15 +0.20 1.Qb1 Nf6 2.Ng5 g6 3.Re1 Bh2+ 4.Kh1 Bf4 5.Nf3 Kh8 6.Qc2 (17.062.011) 1122
10/29 0:25 +0.29 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Qf7 7.Rfe1 Nf6 8.Qh8+ Qg8 (29.412.793) 1158
11/31 0:29 +0.35 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Ng8 8.Rfe1 Qb6 9.Na4 (34.476.880) 1187
12/36 0:57 0.00-- 1.Bxh7+ (70.706.885) 1225
12/36 1:34 -0.51 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Kf7 8.Rac1 Qd8 9.Qxd8 Nxd8 10.Rfe1 (119.785.084) 1265
12/36 2:01 +0.15 1.Ng5 g6 2.Re1 Nf4 3.Bb1 Qe7 4.h4 Qc7 5.g3 Nh5 6.Qg4 e5 (148.854.535) 1223
12/36 2:53 +0.21 1.Qb1 Nf6 2.Rc1 Kh8 3.Ng5 g6 4.Nf3 Qg7 5.Bg5 Nh5 6.Ne2 Rxf3 7.gxf3 Nxd4 (205.938.083) 1187

Dr.Wael Deeb · Post by **Dr.Wael Deeb** » Thu May 08, 2008 11:58 am

genorb wrote:
rightrook wrote:On my PC.....

Ruffian 1.0.5 finds it in 19 seconds....

regards

Robert
Yes but soon after Ruffian change its minds

5/15 0:00 +0.56 1.Ng5 Nf6 2.Qc2 h6 3.Bh7+ Kh8 (43.342) 309
6/17 0:00 +0.22 1.Ng5 Nf6 2.Re1 Bf4 3.Qa4 Kh8 4.Bxf4 Qxf4 (104.531) 373
6/17 0:00 +0.32 1.Re1 Nf4 2.Ng5 h6 3.Bxf4 Rxf4 4.Bh7+ Kh8 (167.791) 479
7/25 0:00 +0.26 1.Re1 Nf4 2.Ng5 Nxd3 3.Qxd3 Rf5 4.Bd2 Qe7 (336.899) 687
7/25 0:00 +0.31 1.Ng5 Nf6 2.Rc1 e5 3.dxe5 Bxe5 4.Re1 Nd4 (520.886) 789
8/25 0:01 +0.25 1.Ng5 Nf6 2.Rc1 Bd7 3.Re1 Bf4 4.Qa4 Rac8 5.Bxf4 Qxf4 (1.263.517) 1010
9/28 0:04 +0.28 1.Ng5 g6 2.Re1 Bh2+ 3.Kh1 Bf4 4.Nf3 Bd7 5.Rc1 Rac8 6.Bxf4 Nxf4 (5.031.970) 1091
10/28 0:10 +0.19 1.Ng5 g6 2.Re1 Nf4 3.Rc1 Qg7 4.Nf3 Bd7 5.Kh1 Nxd3 6.Qxd3 (11.248.078) 1124
10/28 0:15 +0.20 1.Qb1 Nf6 2.Ng5 g6 3.Re1 Bh2+ 4.Kh1 Bf4 5.Nf3 Kh8 6.Qc2 (17.062.011) 1122
10/29 0:25 +0.29 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Qf7 7.Rfe1 Nf6 8.Qh8+ Qg8 (29.412.793) 1158
11/31 0:29 +0.35 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Ng8 8.Rfe1 Qb6 9.Na4 (34.476.880) 1187
12/36 0:57 0.00-- 1.Bxh7+ (70.706.885) 1225
12/36 1:34 -0.51 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Kf7 8.Rac1 Qd8 9.Qxd8 Nxd8 10.Rfe1 (119.785.084) 1265
12/36 2:01 +0.15 1.Ng5 g6 2.Re1 Nf4 3.Bb1 Qe7 4.h4 Qc7 5.g3 Nh5 6.Qg4 e5 (148.854.535) 1223
12/36 2:53 +0.21 1.Qb1 Nf6 2.Rc1 Kh8 3.Ng5 g6 4.Nf3 Qg7 5.Bg5 Nh5 6.Ne2 Rxf3 7.gxf3 Nxd4 (205.938.083) 1187

In human terms Ruffian goes chicken

genorb · Post by **genorb** » Thu May 08, 2008 12:27 pm

Dr.Wael Deeb wrote:
genorb wrote:
rightrook wrote:On my PC.....

Ruffian 1.0.5 finds it in 19 seconds....

regards

Robert
Yes but soon after Ruffian change its minds

5/15 0:00 +0.56 1.Ng5 Nf6 2.Qc2 h6 3.Bh7+ Kh8 (43.342) 309
6/17 0:00 +0.22 1.Ng5 Nf6 2.Re1 Bf4 3.Qa4 Kh8 4.Bxf4 Qxf4 (104.531) 373
6/17 0:00 +0.32 1.Re1 Nf4 2.Ng5 h6 3.Bxf4 Rxf4 4.Bh7+ Kh8 (167.791) 479
7/25 0:00 +0.26 1.Re1 Nf4 2.Ng5 Nxd3 3.Qxd3 Rf5 4.Bd2 Qe7 (336.899) 687
7/25 0:00 +0.31 1.Ng5 Nf6 2.Rc1 e5 3.dxe5 Bxe5 4.Re1 Nd4 (520.886) 789
8/25 0:01 +0.25 1.Ng5 Nf6 2.Rc1 Bd7 3.Re1 Bf4 4.Qa4 Rac8 5.Bxf4 Qxf4 (1.263.517) 1010
9/28 0:04 +0.28 1.Ng5 g6 2.Re1 Bh2+ 3.Kh1 Bf4 4.Nf3 Bd7 5.Rc1 Rac8 6.Bxf4 Nxf4 (5.031.970) 1091
10/28 0:10 +0.19 1.Ng5 g6 2.Re1 Nf4 3.Rc1 Qg7 4.Nf3 Bd7 5.Kh1 Nxd3 6.Qxd3 (11.248.078) 1124
10/28 0:15 +0.20 1.Qb1 Nf6 2.Ng5 g6 3.Re1 Bh2+ 4.Kh1 Bf4 5.Nf3 Kh8 6.Qc2 (17.062.011) 1122
10/29 0:25 +0.29 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Qf7 7.Rfe1 Nf6 8.Qh8+ Qg8 (29.412.793) 1158
11/31 0:29 +0.35 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Ng8 8.Rfe1 Qb6 9.Na4 (34.476.880) 1187
12/36 0:57 0.00-- 1.Bxh7+ (70.706.885) 1225
12/36 1:34 -0.51 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.Qc2+ Kf6 4.Nh7+ Kf7 5.Nxf8 Kxf8 6.Qh7 Nf6 7.Qh8+ Kf7 8.Rac1 Qd8 9.Qxd8 Nxd8 10.Rfe1 (119.785.084) 1265
12/36 2:01 +0.15 1.Ng5 g6 2.Re1 Nf4 3.Bb1 Qe7 4.h4 Qc7 5.g3 Nh5 6.Qg4 e5 (148.854.535) 1223
12/36 2:53 +0.21 1.Qb1 Nf6 2.Rc1 Kh8 3.Ng5 g6 4.Nf3 Qg7 5.Bg5 Nh5 6.Ne2 Rxf3 7.gxf3 Nxd4 (205.938.083) 1187
In human terms Ruffian goes chicken

That's true

Sac of the day

Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day

Re: Sac of the day