Author: Pete R.
Date: 16:18:56 06/05/00
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.
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