Author: Robert Hyatt
Date: 18:16:07 03/09/02
Go up one level in this thread
On March 09, 2002 at 12:46:00, Will Singleton wrote:
>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.
remember that +1.x here is good for _white_ not black. The eval would be
-1.x in normal terms...
>
>
>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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