Author: Frank E. Oldham
Date: 19:18:21 06/15/04
Go up one level in this thread
On June 15, 2004 at 08:35:18, Rob Basham wrote:
>[D]r1b1kb1r/1p4pp/p2ppn2/8/2qNP3/2N1B3/PPP3PP/R2Q1RK1 w kq - 0 1
>
>
>Some engines have trouble finding RxN...!
>
>
>Ruffian 101 takes 1 min. and 28 sec.
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>Chess Tiger 14 only 7 sec.
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>P3/850
>
>Rob
Indeed, this is a difficult ply 15 search problem for crafty19.10
8-> 1.01 0.48 1. Qd2 e5 2. b3 Qc7 3. Nf3 Be7 4. Rad1
O-O (s=16)
9 1.08 -- 1. Qd2
9 1.17 0.02 1. Qd2 e5 2. b3 Qc7 3. Nf5 Bxf5 4.
exf5 Rc8 5. Nd5 Qxc2 (s=15)
9 2.24 0.16 1. Nb3 Bd7 2. Bb6 Be7 3. Qd4 Qxd4+
4. Nxd4 O-O 5. Nb3 Bc6 6. Rf4 (s=13)
9 2.88 0.24 1. Qf3 e5 2. Nb3 Be6 3. Bb6 Bg4 4.
Qd3 Qxd3 5. cxd3 Be7 (s=12)
9 3.50 0.29 1. Bg5 Be7 2. Qd2 O-O 3. a4 e5 4. Bxf6
Bxf6 5. Nf5 Bxf5 6. Rxf5 (s=11)
9-> 4.59 0.29 1. Bg5 Be7 2. Qd2 O-O 3. a4 e5 4. Bxf6
Bxf6 5. Nf5 Bxf5 6. Rxf5 (s=4)
10 5.73 0.16 1. Bg5 Be7 2. Qd2 O-O 3. Rf2 e5 4.
Bxf6 gxf6 5. Nf5 Bxf5 6. Rxf5 b5 (s=3)
10 7.24 0.20 1. Nb3 Bd7 2. Bb6 Be7 3. Qd4 Qxd4+
4. Nxd4 O-O 5. Rf3 d5 6. Re1 Bb4 7.
exd5 Nxd5 (s=2)
10 9.28 0.27 1. Qd2 e5 2. b3 Qc7 3. Nf5 Be6 4. Bg5
O-O-O 5. Bxf6 Qc5+ 6. Ne3 gxf6 7. Rxf6
10-> 13.89 0.27 1. Qd2 e5 2. b3 Qc7 3. Nf5 Be6 4. Bg5
O-O-O 5. Bxf6 Qc5+ 6. Ne3 gxf6 7. Rxf6
(s=16)
11 19.39 -0.08 1. Qd2 Bd7 2. Nf3 e5 3. Qd3 Qxd3 4.
cxd3 Be7 5. d4 exd4 6. Nxd4 O-O 7.
Rac1 (s=15)
11 23.91 0.14 1. Nb3 Bd7 2. Bb6 Be7 3. Qd4 Qxd4+
4. Nxd4 O-O 5. Rf3 Ng4 6. Raf1 Rxf3
7. Nxf3 Rf8 (s=14)
11 43.52 0.20 1. Qe2 Qxe2 2. Ndxe2 b5 3. Bg5 Be7
4. Bxf6 gxf6 5. a4 b4 6. Na2 Bb7 7.
Rad1
11-> 47.25 0.20 1. Qe2 Qxe2 2. Ndxe2 b5 3. Bg5 Be7
4. Bxf6 gxf6 5. a4 b4 6. Na2 Bb7 7.
Rad1 (s=16)
12 49.08 0.01 1. Qe2 Qxe2 2. Ndxe2 b5 3. Bg5 Be7
4. Bxf6 gxf6 5. a4 b4 6. Na2 Bb7 7.
Nf4 e5 (s=15)
12 1:03 0.22 1. Nb3 Bd7 2. Bb6 Be7 3. Qd4 Qxd4+
4. Nxd4 O-O 5. Rf3 Ng4 6. Raf1 Rxf3
7. Nxf3 Rf8 8. Bd4 (s=13)
12-> 1:58 0.22 1. Nb3 Bd7 2. Bb6 Be7 3. Qd4 Qxd4+
4. Nxd4 O-O 5. Rf3 Ng4 6. Raf1 Rxf3
7. Nxf3 Rf8 8. Bd4 (s=3)
13 3:40 0.07 1. Nb3 Be7 2. Qd4 Qxd4 3. Bxd4 b5 4.
e5 dxe5 5. Bxe5 O-O 6. Rad1 Bb7 7.
Na5 Bc5+ 8. Kh1 Bc8 (s=2)
13 5:30 0.12 1. Nf3 Bd7 2. Qd4 Qxd4 3. Bxd4 e5 4.
Bb6 Be7 5. Rad1 Bb5 6. Nxb5 axb5 7.
Ng5 Rxa2 8. Ne6 Nxe4 9. Nxg7+
13-> 7:11 0.12 1. Nf3 Bd7 2. Qd4 Qxd4 3. Bxd4 e5 4.
Bb6 Be7 5. Rad1 Bb5 6. Nxb5 axb5 7.
Ng5 Rxa2 8. Ne6 Nxe4 9. Nxg7+ (s=2)
14 8:49 0.15 1. Nf3 e5 2. Nd5 Nxd5 3. Qxd5 Qxd5
4. exd5 Bg4 5. Ng5 g6 6. Nf7 Rg8 7.
Ng5 O-O-O 8. Nxh7 Be7
14-> 14:15 0.15 1. Nf3 e5 2. Nd5 Nxd5 3. Qxd5 Qxd5
4. exd5 Bg4 5. Ng5 g6 6. Nf7 Rg8 7.
Ng5 O-O-O 8. Nxh7 Be7 (s=3)
15 23:35 0.09 1. Nf3 Bd7 2. Qd4 Qxd4 3. Bxd4 O-O-O
4. Ng5 e5 5. Bb6 Re8 6. Nf7 Rg8 7.
Rad1 Bc6 8. Nxd6+ Bxd6 9. Rxd6 Nxe4
10. Nxe4 Bxe4 (s=2)
15 37:24 ++ 1. Rxf6!!
15 41:28 2.78 1. Rxf6 gxf6 2. Qh5+ Kd8 3. Qf7 Be7
4. Nf5 Qc7 5. Na4 Rf8 6. Qxh7 d5 7.
Qxe7+ Qxe7 8. Nxe7 Kxe7 <HT>
15-> 41:42 2.78 1. Rxf6 gxf6 2. Qh5+ Kd8 3. Qf7 Be7
4. Nf5 Qc7 5. Na4 Rf8 6. Qxh7 d5 7.
Qxe7+ Qxe7 8. Nxe7 Kxe7 <HT> (s=5)
16 45:18 3.16 1. Rxf6 gxf6 2. Qh5+ Kd8 3. Qf7 Be7
4. Nf5 Qc7 5. Na4 Rf8 6. Qxh7 exf5
7. Bb6 Re8 8. Bxc7+ Kxc7 9. Qf7 Bd7
(s=4)
16-> 46:00 3.16 1. Rxf6 gxf6 2. Qh5+ Kd8 3. Qf7 Be7
4. Nf5 Qc7 5. Na4 Rf8 6. Qxh7 exf5
7. Bb6 Re8 8. Bxc7+ Kxc7 9. Qf7 Bd7
letting it run for a while longer, we end up with
19-> 144:34 3.90 1. Rxf6 gxf6 2. Qh5+ Kd8 3. Qf7 Be7
4. Nf5 Qc7 5. Na4 Rf8 6. Qxh7 exf5
7. Bb6 Re8 8. Bxc7+ Kxc7 9. Qf7 Bd7
10. Qc4+ Bc6 11. exf5 Rac8
Frank
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