Test position

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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Test position

Post by kgburcham »

[D] r1r5/P4k1p/2pbp3/3n1p2/2B4P/1P1R4/R4B2/5K2 w - - bm b4
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royb
Posts: 536
Joined: Thu Mar 09, 2006 12:53 am

Re: Test position

Post by royb »

kgburcham wrote:[D] r1r5/P4k1p/2pbp3/3n1p2/2B4P/1P1R4/R4B2/5K2 w - - bm b4
Naum4 32-bit (1-cpu) sees it after an 18 ply search on my 2.5 GHz laptop:

14 +0.19 1.Rdd2 Ke7 2.Bg1 Nc3 3.Ra6 Ne4 4.Rd1 Nc3 5.Re1 Ne4 6.Bd4 Bg3 7.Rd1 h5 (12.91)
15 +0.19 1.Rdd2 Ke7 2.Bg1 Nc3 3.Ra6 Ne4 4.Rd1 Nc3 5.Re1 (19.39)
16 +0.20 1.Rdd2 Ke7 2.Bg1 Kd7 3.Rg2 Re8 4.Bd4 e5 5.Rg7+ Re7 6.Rxe7+ Kxe7 7.Bf2 Ke6 8.Ke2 e4 (30.33)
17 +0.15 1.Rdd2 Ke7 2.Bg1 Kd7 3.Rg2 Re8 4.Bf2 Be5 5.Rg5 Bf6 6.Rh5 Re7 7.Bc5 Rg7 8.Rd2 Bc3 (44.92)
18 +0.15 1.Rdd2 Ke7 2.Bg1 f4 3.Rg2 Kf6 4.Rg5 Rc7 5.Bxd5 cxd5 6.Bd4+ e5 7.Ra6 exd4 8.Rxd6+ Kf7 9.Rdxd5 Raxa7 (126.26)
18 +0.29 1.b4 Bxb4 2.Ra4 Bc3 3.Bc5 Bf6 4.Rb3 Be7 5.Bf2 Nc7 6.Rb7 h6 7.Kg2 Nd5 8.Ra6 Ke8 9.Ra1 Kf7 (162.43)

For comparison purposes, Rybka-3 32-bit (1-cpu) takes more than 10 times longer on the same hardware to spot the same move:

14 +0.14 1.Rdd2 Ke7 2.Bg1 Kd7 3.Rg2 Re8 4.Ra6 Nf4 5.Rg5 Nd5 6.Rg7+ Re7 7.Rg2 (39.85)
15 +0.14 1.Rdd2 Ke7 2.Bg1 Kd7 3.Rg2 Re8 4.Ra6 Nf4 5.Rg5 Nd5 6.Rg7+ Re7 7.Rg2 (102.13)
16 +0.08 1.Rdd2 Ke7 2.Bg1 Kd7 3.Rg2 Re8 4.Ra6 Nf4 5.Rg5 Nd5 6.Bd4 Re7 7.Rg2 f4 (177.53)
16 +0.11 1.Rd1 Ke7 2.Rc1 Kd7 3.Ke2 Rc7 4.Ra6 e5 5.Rg1 Nf4+ 6.Kd2 Ne6 7.Bxe6+ (277.14)
17 +0.21 1.Rd1 Ke7 2.Rc1 Kd7 3.Ke2 Rc7 4.Ra6 Nf4+ 5.Kd2 Nd5 6.Rg1 Bh2 7.Re1 Bd6 8.Ke2 Nc3+ (531.54)
18 +0.21 1.Rd1 Ke7 2.Rc1 Kd7 3.Ke2 Rc7 4.Ra6 Nf4+ 5.Kd2 Nd5 6.Rg1 Bh2 7.Re1 Bd6 8.Rg1 Bh2 9.Re1 Bd6 10.Rg1 Bh2 11.Re1 Bd6 12.Rg1 Bh2 13.Re1 Bd6 14.Rg1 Bh2 15.Re1 Bd6 16.Rg1 (695.84)
19 +0.17 1.Rd1 Ke7 2.Rc1 Kd7 3.Ke2 Rc7 4.Ra6 Nf4+ 5.Kd2 Nd5 6.Rg1 Bh2 7.Re1 Bd6 8.Ke2 Nf4+ (1179.19)
19 +0.41 1.b4 (2503.47)
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Test position

Post by bob »

kgburcham wrote:[D] r1r5/P4k1p/2pbp3/3n1p2/2B4P/1P1R4/R4B2/5K2 w - - bm b4
Gave this a quick run this morning. Crafty (current version) finds it almost instantly, but loses it for about 10 seconds before coming back to it and sticking with it...

Code: Select all

               11     0.78   0.28   1. Rd1 Ke7 2. Ra6 Kd7 3. b4 Bxb4 4.
                                    Rb1 c5 5. Rd1 f4 6. Bxd5 exd5 7. Rxd5+
               11     1.16   0.60   1. b4 Be7 2. Bxd5 exd5 3. Rf3 Bxb4
                                    4. Bd4 Ke6 5. Re2+ Kd6 6. Rxf5 Rg8
               11->   1.16   0.60   1. b4 Be7 2. Bxd5 exd5 3. Rf3 Bxb4
                                    4. Bd4 Ke6 5. Re2+ Kd6 6. Rxf5 Rg8
                                    (s=3)
               12     1.32     -1   1. b4?                            
               12     1.84   0.20   1. b4 Bxb4 2. Rb2 c5 3. Rxd5 exd5 4.
                                    Bxd5+ Kf6 5. Bxa8 Rxa8 6. Ra2 c4 7.
                                    Ke2 (s=2)
               12     2.99   0.29   1. Rd1 Ke7 2. Ra6 Nc3 3. Re1 Ne4 4.
                                    Bd4 Bg3 5. Rd1 h5 6. Be2 Bxh4 7. Bxh5
               12->   3.16   0.29   1. Rd1 Ke7 2. Ra6 Nc3 3. Re1 Ne4 4.
                                    Bd4 Bg3 5. Rd1 h5 6. Be2 Bxh4 7. Bxh5
                                    (s=4)
               13     3.61   0.32   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 (s=3)
               13->   4.11   0.32   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 (s=2)
               14     4.48   0.32   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 8. Rg4
               14->   5.53   0.32   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 8. Rg4 (s=3)
               15     6.14   0.30   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 8. Rg4 Kc7 (s=2)
               15->   8.39   0.30   1. Rd1 Ke7 2. Ra6 f4 3. Re1 Rf8 4.
                                    Ke2 Kd7 5. Rg1 Be5 6. Bc5 f3+ 7. Kf2
                                    Rf7 8. Rg4 Kc7 (s=5)
               16    14.19   0.20   1. Rd1 Ke7 2. Ra6 Nc3 3. Re1 Ne4 4.
                                    Bg1 Bg3 5. Re2 Be5 6. Bf2 Rc7 7. b4
                                    Bc3 8. b5 Nd2+ 9. Rxd2 <HT> &#40;s=4&#41;
               16    30.59   0.46   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Be7 5. Bf2 e5 6. Ba6 Rc7 7. Bb7
                                    Nc3 8. Bxa8 Nxa4
               16->  31.15   0.46   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Be7 5. Bf2 e5 6. Ba6 Rc7 7. Bb7
                                    Nc3 8. Bxa8 Nxa4 &#40;s=3&#41;
               17    32.96   0.66   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Be7 5. Bf2 Nc7 6. Rb7 Nd5 7. h5
                                    e5 8. Bh4 Ke8 9. Bxe7 Nxe7 &#40;s=2&#41;
               17->  33.88   0.66   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Be7 5. Bf2 Nc7 6. Rb7 Nd5 7. h5
                                    e5 8. Bh4 Ke8 9. Bxe7 Nxe7
               18    37.99   0.65   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Re8 5. Rb7+ Kg6 6. Bd3 Be7 7. Bf2
                                    e5 8. h5+ Kf6 9. Rc4 c5 10. Bxc5 Bxc5
                                    11. Rxc5
               18->  39.44   0.65   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Re8 5. Rb7+ Kg6 6. Bd3 Be7 7. Bf2
                                    e5 8. h5+ Kf6 9. Rc4 c5 10. Bxc5 Bxc5
                                    11. Rxc5
               19    52.38   0.79   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Re8 5. h5 Be7 6. Rb7 Kf8 7. Bd4
                                    c5 8. Be5 Ne3+ 9. Ke2 Nxc4 10. Rxc4
                                    Red8
               19->  53.42   0.79   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Re8 5. h5 Be7 6. Rb7 Kf8 7. Bd4
                                    c5 8. Be5 Ne3+ 9. Ke2 Nxc4 10. Rxc4
                                    Red8
               20     1&#58;08   0.50   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Rd8 5. Rb7+ Kg6 6. Ra6 Rdc8 7.
                                    Bf2 h5 8. Ra3 e5 <HT>
               20->   2&#58;05   0.50   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Rd8 5. Rb7+ Kg6 6. Ra6 Rdc8 7.
                                    Bf2 h5 8. Ra3 e5 <HT> &#40;s=2&#41;
               21     2&#58;21   0.60   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Rd8 5. Rb7+ Kg6 6. Ra6 Rdc8 7.
                                    Bf2 h5 8. Ra3 Be5 9. Ke2 Rd8 10. Kf3
                                    Rd6 11. Be3 Nxe3 12. Kxe3
               21->   2&#58;32   0.60   1. b4 Bxb4 2. Ra4 Bc3 3. Bc5 Bf6 4.
                                    Rb3 Rd8 5. Rb7+ Kg6 6. Ra6 Rdc8 7.
                                    Bf2 h5 8. Ra3 Be5 9. Ke2 Rd8 10. Kf3
                                    Rd6 11. Be3 Nxe3 12. Kxe3
              time=3&#58;27  mat=-1  n=3395596355  fh=90%  nps=16.4M
              ext-> check=93.8M qcheck=145.4M reduce=1581.5M/287.3M
              predicted=0  evals=2618.7M  50move=0  EGTBprobes=0  hits=0
              SMP->  splits=425213  aborts=53808  data=60/512  elap=3&#58;27
terminating SMP processes.

White&#40;1&#41;&#58; b4
It doesn't appear to be a "spectacular" move, just one that gains a positional edge.
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