Author: Robert Hyatt
Date: 08:39:31 08/26/04
Go up one level in this thread
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)
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