Author: Stuart Cracraft
Date: 19:47:56 08/27/04
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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) In your output, what does s=2 and s=3 mean? How about !! ? And is the -value relative to the side on move? Finally, is this your 4-cpu Xeon? If so, what speed are the chips and what are the characteristics that distinguish between the Xeon and a regular Intel chip? Stuart
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