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Subject: Re: Position from Leiden, Round 10

Author: Anthony Cozzie

Date: 13:35:39 10/30/02

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On October 30, 2002 at 16:13:36, Gerd Isenberg wrote:

>Position from Shark - IsiChessMMX, Leiden Round 10
>
>[D] r4rk1/2n1b1pN/pqb1p1Qp/1p6/P1p3n1/N1P1B3/1PB2PPP/R2R2K1 b - - ; bm Rxf2
>
>Even if the position is already won by black, finding the spectacular 24...Rxf2
>seems quite difficult for some engines. Ruffian is clearly the fastest i tried
>so far on my 2.1XP+ :
>
>Ruffian 1.0.0    2 seconds
>Shredder5       14 seconds
>IsiChessMMX     47 seconds
>
>May be a bad testposition due to Nxe3 wins too.
>
>Cheers,
>Gerd

Zappa: a bit under 2 minutes.  Rxf2 seems to be clearly superior to Nxe3, so I
think its safe to say Rxf2 is the solution here.

1...Nxe3 2. a5 Qc5 3. fxe3 Qxe3 4. Kh1
 = (1.08)	Depth: 5	00:00:00.14	18kN
1...Nxe3 2. a5 Qc5 3. fxe3 Qxe3 4. Kh1 Rfe8
 = (1.09)	Depth: 6	00:00:00.37	50kN
1...Nxe3 2. a5 Qc5 3. fxe3 Qxe3 4. Kh1 Rfe8 5. Re1
 = (1.09)	Depth: 7	00:00:01.53	234kN
1...Nxe3 2. fxe3 Qxe3 3. Kh1 Rf2 4. Re1 Re2 5. Rxe2 Qxe2
 = (1.09)	Depth: 8	00:00:02.55	496kN
1...Nxe3 2. fxe3 Qxe3 3. Kh1 Rf2 4. Qxg7 Kxg7 5. Nxc4 Rxc2 6. Nxe3
 + (1.34)	Depth: 9	00:00:03.79	873kN
1...Nxe3 2. fxe3 Qxe3 3. Kh1 Rf2 4. Re1 Qd2 5. axb5 Bxg2 6. Kg1 axb5
 = (1.88)	Depth: 9	00:00:05.31	1389kN
1...Nxe3 2. a5 Qc5 3. fxe3 Qxe3 4. Kh1 Rf2 5. Re1 Qd2 6. Red1 Bxg2 7. Kg1
 = (1.88)	Depth: 10	00:00:11.67	3398kN
1...Nxe3 2. a5 Qc5 3. fxe3 Qxe3 4. Kh1 Rf2 5. Re1 Qd2 6. Red1 Bxg2 7. Kg1 Qe3
 = (1.88)	Depth: 11	00:00:22.75	6821kN
1...Rxf2 2. Nf6 Bxf6 3. Qh7 Kf8 4. Bxb6 Rxg2 5. Kf1 Nxh2 6. Ke1 Bh4 7. Bf2 Rxf2
8. Bf5 exf5 9. Nb1
 + (2.13)	Depth: 12	00:01:51.95	35927kN
1...Rxf2 2. Nf6 Bxf6 3. Qh7 Kf8 4. axb5 Nxe3 5. Kxf2 Nxd1 6. Kf1 axb5
 + (3.63)	Depth: 12	00:02:31.77	50029kN
1...Rxf2 2. Nf6 Bxf6 3. Qh7 Kf8 4. Qh8 Ke7 5. Qxg7 Bxg7 6. Bxb6 Rxg2 7. Kf1 bxa4
8. Bxc7 Ne3 9. Ke1 Nxc2 10. Nxc2 Rxc2
 = (4.87)	Depth: 12	00:03:27.90	69267kN
1...Rxf2 2. Nf6 Bxf6 3. Qh7 Kf8 4. Qh8 Ke7 5. Qxg7 Bxg7 6. Bxb6 Rxg2 7. Kf1 Nxh2
8. Ke1 Bf3 9. Be4 Bxe4 10. Bc5 Kf6 11. Bd4 Kg5
 + (5.12)	Depth: 13	00:05:30.49	108578kN
1...Rxf2 2. Nf6 Bxf6 3. Qh7 Kf8 4. Bxb6 Rxg2 5. Kf1 Nxh2 6. Ke1 Bh4 7. Bf2 Rxf2
8. Rd2 Rf1 9. Ke2 Bf3 10. Ke3 Ng4 11. Kd4 Rxa1 12. Kc5
 = (5.31)	Depth: 13	00:07:06.81	141169kN

Time: 449121ms, Nodes: 148368k, Quiescence Nodes: 40999k [28%]
Table Hits: 27520k [19%], Table Pings: 41118k [28%], NPS: 330k, Null Cuts: 6540k



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