Author: Albert Silver
Date: 05:39:04 02/03/04
Go up one level in this thread
On February 02, 2004 at 13:00:00, Anthony Cozzie wrote:
>On February 02, 2004 at 10:41:38, Albert Silver wrote:
>
>>
>>>Round 8: Zappa - Searcher 1-0
>>
>>>A few moves later Zappa was able to get a tactical win with Re6!
>>>
>>>[D]1rb2rk1/4R1p1/1pqn1pBp/3p4/5Q2/1NP3PP/6PK/4R3 w - - 0 30
>>>
>>>1. Re1-e6 Bc8xe6 2. Nb3-d4 Qc6-c4 3. Qf4xd6 Be6xh3 4. Kh2xh3 Kg8-h8 5. Nd4-e6
>>>Rf8-g8 6. Qd6-d7 Qc4-c8 7. Qd7xd5 Rb8-a8 8. Qd5-f5
>>> = (3.58) Depth: 15/23 00:03:03.90 174729471kN
>>
>>A fantastic combination.
>>
>> Albert
>
>Note that Zappa played Re6 entirely on eval, not search. In the position at the
>end of the PV, white has BN v RP. Zappa is giving white almost 3 pawns worth of
>positional compensation due to very agressively placed Ne6, Re7, and the black
>king being in danger.
>
>anthony
I'll trust what you say, but it is the best move by far. I let Shredder 7.04 and
some other engines sit on it and they had no luck either, preferring Nd4 at
~+2.xx, but after feeding it the first moves, which they agreed on, the eval
flew through the roof. It's the winner, no doubt about it. Here's some analysis
by Shredder 7.04 and Fritz 8 for example at the beginning:
New game
1rb2rk1/4R1p1/1pqn1pBp/3p4/5Q2/1NP3PP/6PK/4R3 w - - 0 1
Analysis by Shredder 7.04:
30.Be8 Rxe8 31.Rxe8+ Nxe8 32.Qxb8 Kf7 33.Ra1 Kg8 34.Nd4 Qc5 35.Ra8 Nd6 36.Ne6
Qc6 37.Qc7 +- (2.62) Depth: 16/39 143775kN
New game
1rb2rk1/4R1p1/1pqn1pBp/3p4/5Q2/1NP3PP/6PK/4R3 w - - 0 1
Analysis by Fritz 8:
30.Be8 Rxe8 31.Rxe8+ Nxe8 32.Qxb8 Kf7 33.Re2 Qc7 34.Qa8 Qb7 35.Qa3 Bf5 36.Nd4
Be4 ± (1.28) Depth: 16/36 339350kN
But after one feeds the first moves, which the engines agree with: 1.R1e6 Bxe6
2.Nd4 Qc4 3.Qxd6 Bxh3 (Bc8 allows Qxb8 simply) 4.Kxh3
[D]1r3rk1/4R1p1/1p1Q1pBp/3p4/2qN4/2P3PK/6P1/8 b - - 0 33
and now 4...Kh8 which the engines see as the best move despite the growing
disastrous eval since 4...Qc8+ for example leads to 5.Nf5 Kh8 (5...Rb7 6.Qxd5
and 7.Rxb7) 6.Rxg7 Qxf5 (what else?) 7.Bxf5 Kxg7 8.Qc7+ Rf7 (8...Kg7 9.Qh7 mate)
9.Qxb8.
After 4...Kh8 the engines see the size of the disaster:
[D]1r3r1k/4R1p1/1p1Q1pBp/3p4/2qN4/2P3PK/6P1/8 w - - 0 34
Analysis by Shredder 7.04:
34.Nf5 Rfd8 35.Rb7 Qf1 36.Kh2 Rbc8 37.Qe7 Rd7 38.Rxd7 b5 39.Rxd5 Rxc3
+- (6.39) Depth: 13/35 17820kN
Analysis by Fritz 8:
34.Nf5 Rfd8 35.Rb7 Qc8 36.Rxb8 Qxb8 37.Qe7 Rg8 38.Nxh6 Qc8+ 39.Bf5 Re8 40.Qf7
+- (6.44) Depth: 14/42 00:03:03 92560kN
Perhaps Zappa didn't see it all, but that it played the best move, seems
unquestionable. A good one to add to the combinations that even engines don't
see easily.
Albert
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