Author: Will Singleton
Date: 09:46:00 03/09/02
Go up one level in this thread
On March 09, 2002 at 11:05:45, Jon Dart wrote:
>Phalanx seems to have an amazing talent for finding "quiet" but deadly moves.
>Here is one example:
>
>[D] rn3rk1/pbp2p1p/1p2pp2/8/3PP3/q1P1QN2/P1P3PP/1K1R1B1R w - -
>
>Phalanx played Rd3 and the game continued c5 Nd2 Ba6 1-0 (White will play c4 and
>Black will have to sac the Queen to avoid the deadly Qh6).
>
>There's probably a better defense but Rd3 is good. Arasan will play Rd3 after
>about 2 minutes on an Athlon 1.3Ghz but doesn't give it a high + score.
>
>I couldn't get Crafty 18.10 to play it all. Crafty "hangs" for a long time
>resolving the move d5. Here is the search output:
>
> clearing hash tables
> time surplus 0.00 time limit 20:00 (20:00)
> nss depth time score variation (1)
> 7 0.97 0.00 1. Nd2 Qd6 2. e5 fxe5 3. Qg5+ Kh8 4.
> Qf6+ Kg8 5. Qg5+
> 7-> 1.00 0.00 1. Nd2 Qd6 2. e5 fxe5 3. Qg5+ Kh8 4.
> Qf6+ Kg8 5. Qg5+
> 8 1.75 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ <HT>
> 8-> 1.89 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ <HT>
> 9 3.18 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ Kh8 5. Qf6+
> 9-> 3.64 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ Kh8 5. Qf6+
> 10 8.14 0.01 1. Nd2 Kh8 2. Bc4 Nd7 3. Qg3 Rac8 4.
> Rhf1 c5 5. d5 Rce8
> 10-> 22.20 0.01 1. Nd2 Kh8 2. Bc4 Nd7 3. Qg3 Rac8 4.
> Rhf1 c5 5. d5 Rce8
> 11 34.17 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ Kh8 5. Qf6+
> 11-> 45.47 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ Kh8 5. Qf6+
> 12 1:09 0.00 1. Nd2 Kh8 2. Qf4 Qxc3 3. Qxf6+ Kg8
> 4. Qg5+ Kh8 5. Qf6+
> 12 10:01 0.06 1. d5 Qe7 2. Nd4 Kh8 3. dxe6 fxe6 4.
> Bc4 Re8 5. Qg3 Bc8 6. Nb5 Na6 7. Rhf1
> 12-> 10:36 0.06 1. d5 Qe7 2. Nd4 Kh8 3. dxe6 fxe6 4.
> Bc4 Re8 5. Qg3 Bc8 6. Nb5 Na6 7. Rhf1
>
>The weird thing is, if I move Rd3 and then have Crafty search the resulting
>position from the Black side, I get over +1 for White right away:
>
> clearing hash tables
> time surplus 0.00 time limit 20:00 (20:00)
> nss depth time score variation (1)
> 6 0.43 1.18 1. ... Qa4 2. Qf4 c5 3. Rd2 Qc6 4.
> Qxf6 <HT>
> 6 0.69 1.05 1. ... Ba6 2. c4 Qe7 3. Rb3 c5 4. Qf4
> cxd4 5. Nxd4
> 6-> 0.72 1.05 1. ... Ba6 2. c4 Qe7 3. Rb3 c5 4. Qf4
> cxd4 5. Nxd4
> 7 0.98 1.36 1. ... Ba6 2. Rd1 Nc6 3. Nd2 b5 4.
> Qg3+ Kh8 5. Qf3 Kg8
> 7 1.33 1.14 1. ... Qd6 2. Nd2 Ba6 3. c4 c5 4. d5
> Nd7 5. dxe6 Qxe6
> 7-> 1.96 1.14 1. ... Qd6 2. Nd2 Ba6 3. c4 c5 4. d5
> Nd7 5. dxe6 Qxe6
> 8 2.11 1.31 1. ... Qd6 2. Nd2 Ba6 3. c4 Nc6 4.
> Qf2 Qb4+ 5. Rb3 Qd6
> 8-> 6.54 1.31 1. ... Qd6 2. Nd2 Ba6 3. c4 Nc6 4.
> Qf2 Qb4+ 5. Rb3 Qd6
> 9 7.22 1.37 1. ... Qd6 2. Nd2 Ba6 3. c4 Nd7 4.
> Qh6 Kh8 5. Be2 Rad8
> 9-> 15.49 1.37 1. ... Qd6 2. Nd2 Ba6 3. c4 Nd7 4.
> Qh6 Kh8 5. Be2 Rad8
> 10 17.50 -- 1. ... Qd6
> 10 25.18 2.41 1. ... Qd6 2. e5 Qd5 3. exf6 Qb5+ 4.
> Kc1 Qf5 5. Qh6 Qg6 6. Qh4 Qe4
> 10 25.44 ++ 1. ... Qe7!!
> 10 33.78 1.62 1. ... Qe7 2. Nd2 Kh8 3. Qh6 Rg8 4.
> Rh3 Rg7 5. Rh4 c5 6. dxc5 bxc5 7. Nc4
> 10 42.62 1.35 1. ... Ba6 2. Rd1 Nd7 3. Nh4 Rac8 4.
> Qg3+ Kh8 5. Qh3 Bb7 6. Bb5 Rcd8 7.
> Qf3
> 10-> 59.27 1.35 1. ... Ba6 2. Rd1 Nd7 3. Nh4 Rac8 4.
> Qg3+ Kh8 5. Qh3 Bb7 6. Bb5 Rcd8 7.
> Qf3
> 11 1:13 1.47 1. ... Ba6 2. c4 Qa4 3. Ra3 Qb4+ 4.
> Rb3 Qd6 5. e5 Qe7 6. Qf4 fxe5 7. Nxe5
> Nd7
> 11-> 2:07 1.47 1. ... Ba6 2. c4 Qa4 3. Ra3 Qb4+ 4.
> Rb3 Qd6 5. e5 Qe7 6. Qf4 fxe5 7. Nxe5
> Nd7
> 12 2:32 1.40 1. ... Ba6 2. c4 Qa4 3. Ra3 Qb4+ 4.
> Rb3 Qe7 5. Nd2 e5 6. Qh6 Kh8 <HT>
>
>Note Crafty prefers Ba6 as Black's response, not c5 as in the game.
>
>--Jon
Yace plays Rd3 in about the same time as Arasan, given the cpu difference (amd
1.6 ghz). However, it appears that your c5 is a mistake, that either Ba6 or Nd7
is fine, as the queen can escape. Crafty's +1 eval isn't justified, as Qe7 is
better than Qa4.
5 35 12 54027 t 1.Nd2 c5 2.Nc4 Qa4 3.Be2 {0}
5 35 12 54570 . 1.Nd2 c5 2.Nc4 Qa4 3.Be2 {0}
6 37 16 81544 t 1.Nd2 c5 2.Qg3+ Kh8 3.Qc7 Bc6H 4.Qe7H {0}
6 37 20 104683 . 1.Nd2 c5 2.Qg3+ Kh8 3.Qc7 Bc6 4.Qe7 {0}
7 45 37 220585 t 1.Nd2 Rc8 2.Bb5 Qa5 3.Qd3 Nc6 4.Rhf1 {0}
7 45 52 322377 . 1.Nd2 Rc8 2.Bb5 Qa5 3.Qd3 Nc6 4.Rhf1 {0}
8 39 103 702463 t 1.Nd2 Kh8 2.Nc4 Qa4 3.Qh6H Nd7H 4.Bd3H Kg8H {0}
8 39 191 1294327 . 1.Nd2 Kh8 2.Nc4 Qa4 3.Qh6 Nd7 4.Bd3 Kg8 {0}
9 44 597 3882800 t 1.Nd2 Rc8 2.Bb5 a6 3.Nc4 Qe7 4.Ba4H Nd7H 5.Rhf1H {0}
9 44 852 5593087 . 1.Nd2 Rc8 2.Bb5 a6 3.Nc4 Qe7 4.Ba4 Nd7 5.Rhf1 {0}
10 38 1520 10203696 t 1.Nd2 Kh8 2.Bb5 a6 3.Nc4 Qe7 4.Ba4 Rg8 5.g3 Nd7 {0}
10 39 4748 32456192 t+ 1.d5 exd5 2.exd5 Rd8 3.Bc4 c6 4.d6 Rxd6 5.Rxd6 Kh8 6.Qe8+
Kg7 {420}
10 40 7434 49674805 t 1.d5 Qc5 2.Qxc5 bxc5 3.Bc4 exd5 4.exd5 Nd7 5.Rhe1 Rab8
6.Ka1 Rfd8 {HT} {0}
10 41 8543 57071236 t+ 1.Rd3 Nd7 2.Nd2 Ba6 3.Qg3+ Kh8 4.Rf3 Bxf1 5.Rhxf1 Qxc3
6.Rxc3 Rg8 {HT} {921}
10 48 9466 63024562 t 1.Rd3 Ba6 2.c4 Qa5 3.Ra3 Qh5 4.Qf4 Qg6 5.g3 Bb7 {0}
10 48 9902 65921831 . 1.Rd3 Ba6 2.c4 Qa5 3.Ra3 Qh5 4.Qf4 Qg6 5.g3 Bb7 {0}
11 52 11699 78461248 t 1.Rd3 Ba6 2.c4 Qa4 3.Ra3 Qb4+ 4.Rb3 Qd6H 5.Qh6H c5H {HT}
{0}
11 52 16560 113146094 . 1.Rd3 Ba6 2.c4 Qa4 3.Ra3 Qb4+ 4.Rb3 Qd6 5.Qh6 c5 {HT}
{0}
12 66 21307 147003367 t 1.Rd3 Ba6 2.c4 Qa4 3.Ra3 Qb4+ 4.Rb3 Qd6 5.Qh6 e5 6.d5
Nd7 7.Be2 {0}
12 66 30944 216230640 . 1.Rd3 Ba6 2.c4 Qa4 3.Ra3 Qb4+ 4.Rb3 Qd6 5.Qh6 e5 6.d5
Nd7 7.Be2 {0}
13 74 53194 374478364 t 1.Rd3 Nd7 2.Nd2 Kh8 3.Qf4 Qd6 4.Qh6 Rg8 5.Rh3 Rg7 6.Bb5
c6 {HT} {0}
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