Author: Tord Romstad
Date: 10:50:19 02/02/04
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.
>
It's a cool move. I expected Gothmog to like it, but it doesn't. It
has R1e6 as its best move for a short period at plies 10 and 11, but
later switches to Nd4 and Be8 (with a winning score).
Here are the results after 16 plies of search (unfortunately Gothmog
hits its "hash table wall" after about 5 minutes of thinking, and the
branching factor increases dramatically):
1 1.09 0.00 163 Nd4
2 1.09 0.00 419 Nd4 Qc5
3 1.23 0.01 1587 Nd4 Qc5 Rf1
4 0.91 0.04 5747 Nd4 Qc5 R1e2 Kh8
5 0.92 0.31 41068 Nd4 Qc5 R1e3 Kh8 Bd3
6 0.92 0.88 87113 Nd4 Qc5 Nb3 Qc6
7 0.73 3.08 449277 Be8 Rxe8 Rxe8+ Nxe8 Qxb8
8 0.73 5.48 911918 Be8 Rxe8 Rxe8+ Nxe8 Qxb8
9 0.98 8.93 1653080 Nd4 Qc5 R1e6 Rb7 Rxb7 Nxb7 Rc6 Qa5 Rc7
10 1.31 14.43 2799840 R1e6 Bxe6 Nd4 Qc4 Qxd6 Bxh3 gxh3 Kh8 Qd7
Qf1 Qxd5
11 1.16 22.36 4528689 R1e6 Bxe6 Nd4 Qc4 Qxd6 Bxh3 gxh3 Kh8 Qe6
Qxc3 Qxd5 Qd2+
12 1.38 37.03 7800022 Be8 Rxe8 Rxe8+ Nxe8 Nd4 Qb7 Rxe8+ Kh7 Ne6
Bxe6 Rxb8 Qa7 Qd6 b5
13 1.50 1:13 16303412 Be8 Rxe8 Rxe8+ Nxe8 Nd4 Qb7 Rxe8+ Kh7 Nf5
Qc6 Nxg7 Kxg7 Re7+ Kf8 Rc7 Qxc7 Qxc7
14 1.50 2:32 33726038 Nd4 Qc5 Nb3 Qc6
15 1.64 5:50 77766641 Be8 Rxe8 Rxe8+ Nxe8 Nd4 Qb7 Rxe8+ Kf7 Rd8
Ra8 Qd6 Kg6 Nc6 Bxh3 Rxa8 Qxa8
16 1.78 19:24 264595980 Be8 Rxe8 Rxe8+ Nxe8 Nd4 Qc5 Rxe8+ Kf7 Rh8
Ra8 Qh4 Kg6 Ne2 Kf7 Qh5+
Tord
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