Test Position

Discussion of anything and everything relating to chess playing software and machines.

Moderator: Ras

swami
Posts: 6663
Joined: Thu Mar 09, 2006 4:21 am

Test Position

Post by swami »

[d] r1r3k1/pp3ppp/4pB2/q1bbP3/5Q1P/2N5/PPP3P1/2KR3R w - - 0 18

What's the solution?
Top
Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Test Position

Post by Terry McCracken »

swami wrote:[d] r1r3k1/pp3ppp/4pB2/q1bbP3/5Q1P/2N5/PPP3P1/2KR3R w - - 0 18

What's the solution?
18. Bxg7..Kxg7 19. Qf6+..Kg8 20. Rh3! there's a lot more with Kg8 and Kf8 lines and Black can resist for many moves.
Terry McCracken
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Test Position

Post by zullil »

Crafty 22.9 likes Rh3.

Code: Select all

White(1): display

       +---+---+---+---+---+---+---+---+
    8  |<R>| . |<R>| . |   | . |<K>| . |
       +---+---+---+---+---+---+---+---+
    7  |<P>|<P>| . |   | . |<P>|<P>|<P>|
       +---+---+---+---+---+---+---+---+
    6  |   | . |   | . |<P>|-B-|   | . |
       +---+---+---+---+---+---+---+---+
    5  |<Q>|   |<B>|<B>|-P-|   | . |   |
       +---+---+---+---+---+---+---+---+
    4  |   | . |   | . |   |-Q-|   |-P-|
       +---+---+---+---+---+---+---+---+
    3  | . |   |-N-|   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    2  |-P-|-P-|-P-| . |   | . |-P-| . |
       +---+---+---+---+---+---+---+---+
    1  | . |   |-K-|-R-| . |   | . |-R-|
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

White(1): go
              time limit 5:00 (+0.00) (5:00)
              depth   time  score   variation (1)
starting thread 1
                9     0.11   0.00   Nxd5 exd5 Qg3 Bf8 Kb1 Kh8 Bg5 Bb4 c3
               10     0.21   0.10   Nxd5 exd5 Qg3 Bf8 Kb1 Kh8 Bg5 Qa4 c3
                                    Qe4+ Rd3 (s=2)
               10     0.51     +1   Rh3!!
               10     0.69   0.20   Rh3 Bf8 Rg3 Rxc3 bxc3 Qxa2 Rd4 Rc8
                                    Kd2 g6
               11     0.93   0.07   Rh3 Bf8 Rg3 Rxc3 bxc3 Qxa2 Rd4 Kh8
                                    Kd2 Qb1 c4 Bb4+ c3
               11     1.32     +1   Nxd5!!
               11     1.55   0.99   Nxd5 exd5 Qg4 Be3+ Kb1 Bh6 Bg5 Rc6
                                    Bxh6 Rxh6 Qd7 Rc6 <HT>
               12     1.98   0.97   Nxd5 exd5 Qg4 Bf8 e6 Kh8 exf7 Qxa2
                                    Bd4 Qa1+ Kd2 Qa5+ Bc3 Qc5 (s=2)
               13     2.94   0.85   Nxd5 exd5 Qg4 Be3+ Kb1 Bh6 Bg5 Bxg5
                                    hxg5 Qc7 Qf5 g6 Qd3 Qxe5 Qxd5 Qxd5
                                    Rxd5
               14     5.76   0.85   Nxd5 exd5 Qg4 Be3+ Kb1 Bh6 Bg5 Bxg5
                                    hxg5 Qc7 Qf5 g6 Qd3 Qxe5 Qxd5 Qxd5
                                    Rxd5
               15    21.93   0.79   Nxd5 exd5 Qg4 Bf8 e6 fxe6 Qxe6+ Kh8
                                    Rxd5 Qb6 Qxb6 axb6 Bc3 Rxa2 Re1 Bc5
                                    (s=2)
               16    52.85   0.39   Nxd5 exd5 Qg4 Bf8 e6 fxe6 Qxe6+ Kh8
                                    Rxd5 Qa4 Bc3 Re8 Qf7 Qxa2 Rhd1 Rac8
                                    Rd7 Qa1+ Kd2 (s=2)
               16     1:24   0.87   Rh3 Bf8 Nxd5 exd5 Rg3 g6 Kb1 Rc4 Qf3
                                    Rac8 c3 Re4 Qf5 Qa4 b3 Qc6 <HT>
               17     1:53   0.90   Rh3 Bf8 Nxd5 exd5 Rg3 g6 Kb1 Rc4 Qf3
                                    Rac8 c3 Re4 Qf5 Qa4 b3 Qc6 h5 (s=2)
               18     3:44   0.83   Rh3 Bf8 Rd4 Bxa2 Rg3 Rxc3 bxc3 g6 Ra4
                                    Ba3+ Kd1 Qd5+ Rd3 Qc5 Rad4 Qb6 Rd8+
                                    Rxd8 Rxd8+ Bf8 g4 Bd5
              time=5:00  mat=0  n=1319883136  fh=89%  nps=4.4M
terminating SMP processes.
White(1): Rh3 
              time used:   5:00
Top
swami
Posts: 6663
Joined: Thu Mar 09, 2006 4:21 am

Re: Test Position

Post by swami »

Terry,

Yes, looks like it's easier for humans, difficult for some engines...

but Bright 0.4a solves it rather quickly.

Analysis by bright-0.4a:

Code: Select all

18.Nxd5 exd5 
  +/=  (0.34)   Depth: 1/6   00:00:00
18.Nxd5 exd5 
  +/=  (0.34)   Depth: 2/7   00:00:00
18.Qg5 g6 19.Nxd5 exd5 
  +/=  (0.37)   Depth: 2/14   00:00:00
18.Qg5 g6 19.Qh6 
  +/=  (0.45)   Depth: 3/14   00:00:00
18.Nxd5 exd5 19.Qg5 
  +/=  (0.49)   Depth: 3/17   00:00:00
18.Nxd5 exd5 19.Qg4 g6 
  +/=  (0.39)   Depth: 4/17   00:00:00
18.Qg5 g6 19.Qh6 Bf8 
  +/=  (0.59)   Depth: 4/17   00:00:00
18.Qg5 g6 19.Nxd5 exd5 20.Qh6 
  +/-  (0.75)   Depth: 5/17   00:00:00
18.Qg5 g6 19.Nxd5 exd5 20.Qh6 Bf8 
  +/-  (0.73)   Depth: 6/22   00:00:00  17kN
18.Qg5 Bf8 19.Nxd5 exd5 20.Kb1 Rc4 21.g4 Rac8 
  +/=  (0.47)   Depth: 7/22   00:00:00  67kN
18.Qg5 Bf8 19.Nxd5 exd5 20.Kb1 Rc4 21.Rd3 Rac8 22.Rg3 
  +/=  (0.47)   Depth: 8/31   00:00:00  352kN
18.Qg5 Bf8 19.Nxd5 exd5 20.Kb1 h6 21.Qg4 Kh8 22.Rhf1 gxf6 23.Rxf6 
  =/+  (-0.50)   Depth: 9/31   00:00:00  890kN
18.Rd3 Bf8 19.Nxd5 exd5 20.Kb1 Rc4 21.Qg5 Rac8 22.Rg3 g6 
  =  (0.16)   Depth: 9/31   00:00:00  1489kN
18.Bxg7 Kxg7 19.Rhf1 Rc7 20.Qf6+ Kg8 21.Rd3 Re8 22.Nxd5 exd5 23.Rg3+ Kf8 24.Qg7+ Ke7 25.Rxf7+ Kd8 
  +/-  (1.01)   Depth: 9/41   00:00:00  2719kN
18.Bxg7 Kxg7 19.Rhf1 Qd8 20.Nxd5 exd5 21.Qxf7+ Kh8 22.Qxb7 Qxh4 23.Qxd5 Be3+ 24.Kb1 Rg8 
  +/-  (0.82)   Depth: 10/41   00:00:01  4401kN
18.Bxg7 Kxg7 19.Rhf1 Qc7 20.Qf6+ Kg8 21.Rd3 Be4 22.Rg3+ Bg6 23.h5 Rd8 24.hxg6 hxg6 
  +/-  (0.91)   Depth: 11/47   00:00:02  9896kN
18.Bxg7 Kxg7 19.Qf6+ Kg8 20.Rh3 Qd8 21.Rg3+ Kf8 22.Qh6+ Ke7 23.Rg7 Qf8 24.Nxd5+ exd5 25.Rd3 Rc6 26.Qg5+ Kd7 27.Rxh7 
  +/-  (1.06)   Depth: 12/47   00:00:06  25866kN
18.Bxg7 Kxg7 19.Qf6+ Kg8 20.Rh3 Qd8 21.Rg3+ Kf8 22.Qh6+ Ke7 23.Rg7 Qf8 24.Rd3 Bb6 25.Nxd5+ exd5 26.g4 Ke8 27.Rxd5 
  +/-  (1.25)   Depth: 13/48   00:00:11  45777kN
Top

Return to “Computer Chess Club: General Topics”