Author: pete
Date: 12:10:07 06/06/00
Go up one level in this thread
On June 05, 2000 at 19:18:56, Pete R. wrote:
>Here is the diagram Mr. Uri posted last week:
>
>[D]r2qr3/pb3pk1/np3b1N/2pp3Q/3P4/1PR1P1P1/P4PBP/5RK1 w - - 0 1
>
>I let Fritz 5.32 run the weekend on it, and after a great deal of
>thought it decided the best move is...1. e4!!.
>
>Analysis by Fritz 5.32:
>
>-+ (-2.94) 1.dxc5 Bxc3 2.Nxf7 00:00:00
>= (-0.25) 1.Nxf7 00:00:00
>² (0.31) 1.Nxf7 00:00:00
>= (0.25) 1.Nxf7 Qe7 00:00:00
>³ (-0.47) 1.Nxf7 Qe7 2.Ne5 00:00:00
>³ (-0.44) 1.Rfc1 00:00:00
>³ (-0.41) 1.Rfc1 Qd7 2.Nf5+ Kg8 00:00:00
>³ (-0.37) 1.Rd3 00:00:00
>³ (-0.34) 1.Rd3 Qd7 2.dxc5 Nxc5 3.Nf5+ Kg8 00:00:00
>³ (-0.31) 1.Qxf7+ 00:00:00
>² (0.50) 1.Qxf7+ Kxh6 2.Qxb7 Nb4 00:00:00
>= (0.06) 1.Qxf7+ Kxh6 2.Qxb7 Nb4 3.a3 00:00:00
>= (0.09) 1.Nxf7 00:00:00
>² (0.44) 1.Nxf7 Qd7 2.Ne5 Bxe5 00:00:00
>² (0.53) 1.Nxf7 Qe7 2.Nh6 Rh8 3.Nf5+ Kf8 00:00:00
>² (0.56) 1.Nxf7 Qd7 2.Nh6 Kf8 3.Nf5 Rac8 00:00:00
>² (0.47) 1.Nxf7 Qe7 2.Nh6 Bc8 3.Qxd5 Nc7 4.Nf5+ Bxf5 5.Qxf5 cxd4 00:00:00
>² (0.69) 1.Nxf7 Qc7 2.Nh6 Rf8 3.Nf5+ Kg8 4.f4 Rae8 5.Nh6+ Kg7 00:00:03
>± (0.75) 1.Nxf7 Qc7 2.Nh6 Rh8 3.Nf5+ Kf8 4.Qg6 Bg7 5.Rd1 Rd8 00:00:08
>² (0.69) 1.Nxf7 Qc7 2.Nh6 Rad8 3.Nf5+ Kf8 4.a3 Qf7 5.Qxf7+ Kxf7 00:00:24
>± (0.81) 1.Nxf7 Qc7 2.Nh6 Rh8 3.Nf5+ Kf8 4.Qg6 Bg7 5.Bxd5 Bxd5 00:01:27
>± (0.81) 1.Nxf7 Qc7 2.Nh6 Rf8 3.g4 Kh8 4.Nf7+ Kg8 5.Qg6+ Bg7 00:03:49
>± (0.84) 1.g4 00:28:08
>± (1.06) 1.g4 Rh8 2.Qxf7+ Kxh6 3.f4 Rg8 4.g5+ Bxg5 5.Qxb7 Nc7 01:22:25
>± (1.00) 1.g4 Rh8 2.Qxf7+ Kxh6 3.f4 Rg8 4.Qxb7 Nc7 5.h3 Bg7 01:41:17
>² (0.50) 1.g4 Rh8 2.Qxf7+ Kxh6 3.f4 Rg8 4.Qxb7 Nb4 5.g5+ Bxg5 04:56:05
>² (0.53) 1.Nxf7 05:04:04
>² (0.69) 1.Nxf7 Qd7 2.Ne5 Bxe5 3.dxe5 Qe6 4.f4 Rh8 5.Qg5+ Kf7 09:27:46
>± (0.72) 1.e4 16:27:07
>± (0.78) 1.e4 dxe4 2.g4 Rh8 22:38:47
>± (0.84) 1.e4 dxe4 2.g4 Rh8 3.Qxf7+ Kxh6 4.Qxb7 Nc7 5.Rh3+ Kg7 37:03:44
>
>Final depth reached is 16 ply. As you can see it took 16.5 hours on a PII
>400 to decide on 1.e4!!. According to my analysis (although not completely
>exhaustive) I do think this is the best move and white likely wins in all
>lines:
>
>1. e4!! dxe4 2. g4 Rh8
>
>other tries:
>
> A) 2...Bc8 3. Qxf7+ Kxh6 4. Rh3+ Bh4 5. Qh5+ Kg7 6. Rxh4 Qf6
> 7. Qxe8 Qxh4 8. Re1 +-.
>
> B) 2...Bh4 3. Nf5+ Kg8 4. g5 Qd7 5. g6 fxg6 6. Qxg6+ Kf8 7. Rg3 +-.
>
> C) 2...Bg5 3. Nf5+ Kf6 4. f4 exf3 5. h4 Bd2 6. Bxf3 Rh8 7. g5+ Ke6
> 8. Re1+ Bxe1 9. Re3+ +-.
>
>3. Qxf7+ Kxh6 4. Rh3+ Bh4 5. Qxb7 and white wins:
>
> a) 5...Nc7 6. dxc5 bxc5 (...Kg7 7. cxb6 axb6 8. Rc3 Rc8
> 9. Rfc1 Bxf2+ 10. Kxf2 +-) 7. Rxh4+ Qxh4 8. Qc6+ Kg7
> 9. Qxc7+ Kg8 10. h3 +-.
>
> b) 5...cxd4 6. f4 Nc7 7. Qxe4 Kg7 8. Qe5+ Bf6 9. Rxh8 Kxh8
> 10. Qh5+ Kg8 11. Qg6+ Kf8 12. g5 +-.
>
> c) 5...Qg5 6. Qxa6 Qxg4 (...Rag8 7. f3 cxd4 8. Qc4 e3 9. Rc1 Rg6
> 10. Qxd4 Rd8 11. Qe4 +-) 7. f3 exf3 8. Rfxf3 Rae8 9. Qf1 +-.
>
>So black is dead meat after 1...dxe4. Black's only serious alternative is
>
>1....Rh8, leading to the line 1. e4 Rh8 2. Qxf7+ Kxh6 3. Rf3 Rf8
>4. Qxb7 and now Nb4 appears best for black. I've analyzed a number of
>continuations and have not been able to prove an ironclad win for white
>in all of them, but white definitely has the upper hand and black is
>merely defending.
I think your analysis is quite convincing ; e4 seems to be the best move and
requires a very deep search . Here some output from Crafty17.10 :
12 15:51 0.06 1. g4 Qd7 2. g5 Bd8 3. Bh3 Qc7 4. Nf5+
Kg8 5. Qh6 f6 6. gxf6 Re6 7. Ne7+ Rxe7
8. Qg6+ Rg7 9. fxg7 Qxg7 10. Qxg7+
Kxg7 11. dxc5 bxc5
12-> 19:05 0.06 1. g4 Qd7 2. g5 Bd8 3. Bh3 Qc7 4. Nf5+
Kg8 5. Qh6 f6 6. gxf6 Re6 7. Ne7+ Rxe7
8. Qg6+ Rg7 9. fxg7 Qxg7 10. Qxg7+
Kxg7 11. dxc5 bxc5
13 37:59 -- 1. g4
13 42:36 -0.48 1. g4 Rh8 2. Qxf7+ Kxh6 3. Qxb7 Nb4
4. f4 Rg8 5. g5+ Bxg5 6. fxg5+ Qxg5
7. Rf2 Raf8 8. e4 Qg4 9. Rg3 Qd1+ 10.
Rf1 Rxf1+ 11. Bxf1 Rxg3+ 12. hxg3 Qxd4+
13 72:19 -0.22 1. e4 dxe4 2. g4 Bc8 3. Qxf7+ Kxh6
4. Rh3+ Bh4 5. Rxh4+ Qxh4 6. Qxe8 Kg7
7. Qe5+ Kf8 8. Qf4+ Kg8 9. Bxe4 Rb8
13 111:18 0.00 1. Nxf7 Qd7 2. Nh6 Kf8 3. Qf3 Ke7 4.
Qf4 Qc7 5. Qf5 Qd7 6. Qf4
(4) 13-> 137:08 0.00 1. Nxf7 Qd7 2. Nh6 Kf8 3. Qf3 Ke7 4.
Qf4 Qc7 5. Qf5 Qd7 6. Qf4
(3) 14 141:49 -0.03 1. Nxf7 Qd7 2. Nh6 Kf8 3. Ng4 Bg7 4.
Nh6 Rab8 5. h3 cxd4 6. exd4 Bf6 7.
Nf5 Rbc8 8. Rfc1
(2) 14 264:24 0.30 1. e4 dxe4 2. g4 Bc8 3. Qxf7+ Kxh6
4. Rh3+ Bh4 5. Qh5+ Kg7 6. Rxh4 Rb8
7. Bxe4 Qxh4 8. Qxh4 Rxe4 9. Qg5+ Kh7
10. Qh5+ Kg7
I didn't want to wait longer and stopped here but I'd expect a fail high on e4
at ply 15 .
What is strange to me is that Dr Hyatt has posted that Crafty17.11 sticks to
Nxf7 right from the start until end of ply 14 . This is really a major change to
17.10 and the result seems to be not too good .
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