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Subject: Test position (hard?)

Author: Anthony Cozzie

Date: 14:25:28 09/29/03


From "Art of Attack in Chess", p269, from Treybal-Wolf Teplitz-Schonau 1922

[D]1r3bk1/2p2p2/3pqPpp/2p1n3/2P1P2R/1PQ3N1/rB4PP/5RK1 b - - 0 1

Wolf here played Nxc4, which Vukovic claims loses.  Vukovic thinks Black should
sacrifice the exchange with  1 ..Rxb2 2. Qxb2 Nxc4 3. Qc3 Ne5.

Zappa here stubbornly sticks with Nxc4, even after a full day's worth of
anaylsis:

1... Nxc4 2. Rb1 Rxb2 3. Rxb2 Nxb2 4. Qxb2 Rxb3 5. Qa1 Qc4 6. Rf4 Qc2 7. Qa8 Rb2
8. Rf1
 = (2.46)       Depth: 13/24    00:01:01.11     29691kN
1... Nxc4 2. Bc1 Ne5 3. Bxh6 Bxh6 4. Rxh6 Rxb3 5. Qc1 Ng4 6. Qg5 Nxh6 7. Qxh6
Rxg2 8. Kxg2 Rb2 9. Rf2
 - (2.16)       Depth: 14/28    00:04:25.43     128216kN
1... g5 2. Rh5
 = (2.16)       Depth: 14/28    00:05:04.37     147721kN
1... g5 2. Rh5 Nxc4 3. Nf5 Nxb2 4. Qg3 g4 5. Qxg4 Kh8 6. Qg5 Ra1 7. Rxa1 Qxe4
 - (1.86)       Depth: 15/33    00:16:23.51     455789kN
1... g5 2. Rh5 Nxc4 3. Nf5 Rxb2 4. Qxc4
 = (1.86)       Depth: 15/32    00:16:56.67     470714kN
1... Nxc4 2. Bc1 Ne5 3. Bxh6 Rxb3 4. Qc1 Ng4 5. Bxf8 Rxg3 6. hxg3 Qxe4 7. Rf3
Qd4 8. Kf1 Ra1 9. Rh8 Kxh8 10. Bg7 Kg8
 = (1.88)       Depth: 16/39    00:30:40.06     866517kN
1... Nxc4 2. Bc1 g5 3. Rxh6 Bxh6 4. bxc4 Rb1 5. Qd3 Ra1 6. Qc3 Qg4 7. Qb3 Bf8 8.
Qe3 Rc2 9. h3 Qh4
 = (1.96)       Depth: 17/39    00:47:26.58     1348472kN
1... Nxc4 2. Bc1 g5 3. Rxh6 Bxh6 4. bxc4 Rb1 5. Nf5 Bf8 6. Qg3 Qxf6 7. Bxg5 Rxf1
8. Kxf1 Qg6 9. Nh4 Qg7 10. Ke1 Qa1 11. Bc1
 = (1.95)       Depth: 18/46    02:04:29.41     3522924kN
1... Nxc4 2. Bc1 g5 3. Rxh6 Bxh6 4. bxc4 Rb1 5. Nf5 Bf8 6. Qg3 Qxf6 7. Bxg5 Rxf1
8. Kxf1 Qg6 9. Bd8 Qxg3 10. Nxg3 Rc2 11. h3
 = (2.05)       Depth: 19/43    03:05:13.14     5271379kN
1... Nxc4 2. Bc1 g5 3. Bxg5 Ne5 4. Bxh6 Ng6 5. Rh5 Rxb3 6. Qc1 Rb2 7. Qg5 c4 8.
Kh1 Rxg2 9. Qf5 Qxf5 10. exf5 Bxh6 11. fxg6 Ra1
 - (1.75)       Depth: 20/56    10:54:43.48     18313543kN
1... Nxc4 2. Bc1 g5 3. Bxg5 Ne5 4. Bxh6 Ng6 5. Rh5 Rxb3 6. Qc1 Rb2 7. Qg5 Rxg2
8. Kh1 Raf2 9. Rxf2 Rxf2 10. Kg1 Qa2 11. Qd5 Bxh6
 = (1.75)       Depth: 20/43    11:08:41.21     18712897kN
1... Nxc4 2. Bc1 g5 3. Bxg5 Ne5 4. Bxh6 Ng6 5. Rh5 Rxb3 6. Qc1 Rb2 7. Qg5 Rxg2
8. Kh1 Rgf2 9. Rxf2 Rxf2 10. Kg1
 = (1.90)       Depth: 21/59    14:32:59.48     24626191kN
1... Nxc4 2. Bc1 g5 3. Bxg5 Ne5 4. Bxh6 Ng6 5. Rh5 Rxb3 6. Qc1 Rb2 7. Qg5 Rxg2
8. Kh1 Rgf2 9. Rxf2 Rxf2 10. Kg1 Qxf6 11. Qe3 Rf3 12. Qe2 Bxh6
 = (1.90)       Depth: 22/65    21:27:33.94     36681946kN

Count: Time: 92340934ms, Nodes: 43966971926 QNodes: 33866453371[77.0%], NPS:476K
Hash:  TProbes: 10095633k [23.0%] TPings: 3406487k [33.7%], THits: 2232677k
[22.1%], PHits: 33346156k [98.5%], KHits: 33346156k [98.5%]
Ext:   Check: 2128695k Pawn: 98350k Recap: 20419k Mate: 3737k Race: 0k Trade: 0k
1Rep: 61237k KS: 0k Singular: 0k

Vukovic here recommends Bc1 g5 Rh3, while Zappa plays Bxg5.  So, who is wrong
here?  Does your engine see a win for white after Nxc4?

anthony



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