Author: Stuart Cracraft
Date: 22:13:41 08/28/04
Go up one level in this thread
On August 27, 2004 at 23:32:11, Robert Hyatt wrote: >On August 27, 2004 at 22:51:09, Stuart Cracraft wrote: > >>On August 26, 2004 at 11:39:31, Robert Hyatt wrote: >> >>>On August 25, 2004 at 12:52:46, Volker Böhm wrote: >>> >>>> >>>>Hi, >>>> >>>>the following position of the iq - test (position 166) cannot be solved from >>>>spike in reasonalbe time (> 2h): >>>> >>>>r4r1k/6pp/3p3b/1p1Npb2/3nB2q/2N3P1/PP3P1P/R2Q1RK1 b - - 0 1 >>>> >>>>(The move to find is Qxe4) >>>> >>>>The reason is a nullmove-problem. After the queen-sac there are many moves that >>>>leads to a mate-thread. But one queen back spike tends to prune because of >>>>nullmove result. >>>> >>>>I tested the position with fritz 8, he solves it in 8 ply in nearly no time. >>>>(PRODEO NEEDS 7 Ply, Ruffian 1.01 11 Ply). >>>> >>>>Are there non commercial engines that solves this position too in a short amount >>>>of time? >>>>Maybe the author of this engine would be so kind to explain the rule that solves >>>>the nullmove-problem. >>>> >>>>Thanks Volker >>> >>> >>>Here is my output: >>> >>> 8-> 0.23 -0.16 1. ... Qh3 2. Bg2 Qg4 3. Ne3 Qxd1 4. >>> Rfxd1 Rac8 5. Nxf5 Rxf5 6. Nd5 (s=2) >>> 9 0.47 -0.03 1. ... Qh3 2. Bxf5 Qxf5 3. f4 Rab8 >>> 4. fxe5 Qxe5 5. Qd3 Rxf1+ 6. Qxf1 Be3+ >>> 7. Nxe3 Qxe3+ 8. Qf2 >>> 9 0.68 -1 1. ... Qxe4!! >>> 9 0.71 -1.01 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. a4 bxc3 6. bxc3 >>> 9-> 0.71 -1.01 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. a4 bxc3 6. bxc3 (s=6) >>> 10 0.75 -1.01 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. a4 bxc3 6. bxc3 (s=5) >>> 10-> 0.85 -1.01 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. a4 bxc3 6. bxc3 (s=3) >>> 11 0.97 -1.28 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> (s=2) >>> 11-> 1.19 -1.28 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> (s=3) >>> 12 1.36 -1.22 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> 7. Rab1 (s=2) >>> 12-> 2.57 -1.22 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> 7. Rab1 (s=3) >>> 13 3.00 -1.25 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> 7. Qc4 Nc2 (s=2) >>> 13-> 4.70 -1.25 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfe1 bxc3 6. bxc3 Ra3 >>> 7. Qc4 Nc2 (s=3) >>> 14 6.08 -1.47 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfb1 bxc3 6. bxc3 Ne2+ >>> 7. Kf1 Rad8 8. Rb6 e4 (s=2) >>> 14-> 18.31 -1.47 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rfb1 bxc3 6. bxc3 Ne2+ >>> 7. Kf1 Rad8 8. Rb6 e4 (s=3) >>> 15 22.98 -1.67 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rae1 bxc3 6. bxc3 Ra3 >>> 7. Qc4 Nc2 8. Rb1 Bd2 (s=2) >>> 15-> 32.85 -1.67 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rae1 bxc3 6. bxc3 Ra3 >>> 7. Qc4 Nc2 8. Rb1 Bd2 (s=3) >>> 16 38.96 -1.54 1. ... Qxe4 2. Nxe4 Bxe4 3. Nc3 Bf3 >>> 4. Qd3 b4 5. Rae1 bxc3 6. bxc3 Ra3 >>> 7. Qc4 Nc2 8. Rb1 Bd2 9. Qe6 (s=2) >> >>Also, is that 16 ply in 38.96 seconds? >> >>Stuart > Nice coding -- I assume the Crafty that's been entered in any public events is no where near that configuration in speed? Stuart >Yes. Quad opteron 2.4ghz
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