Author: Uri Blass
Date: 14:48:10 09/29/03
Go up one level in this thread
On September 29, 2003 at 17:25:28, Anthony Cozzie wrote: >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 > You have a branching factor of less than 2 for the last plies I guess that you do a lot of pruning. Movei fails low on Nc4 at depth 12 and suggests g5. It also seems to have here good branching factor but I will be surprised if it continues to depth 22. 12 140 5739 11415063 e5c4 b2c1 g6g5 h4h6 f8h6 b3c4 b8b1 g3f5 h6f8 f1e1 g5g4 c3g 3 e6f6 g3g4 g8h8 12 141 6250 12413012 g6g5 12 170 6881 13640721 g6g5 12 193 8792 17356419 g6g5 h4h3 e5c4 b2c1 c4a5 c3e1 b8b3 f1f2 a2f2 e1f2 a5c4 h3h 5 12 193 9408 18615125 g6g5 h4h3 e5c4 b2c1 c4a5 c3e1 b8b3 f1f2 a2f2 e1f2 a5c4 h3h 5 13 196 12359 24230577 g6g5 h4h3 e5c4 f1f2 c4b2 f2b2 a2a1 g3f1 e6e4 h3e3 e4d4 b2 e2 d6d5 e2d2 d4c3 e3c3 13 196 14375 28465007 g6g5 h4h3 e5c4 f1f2 c4b2 f2b2 a2a1 g3f1 e6e4 h3e3 e4d4 b2 e2 d6d5 e2d2 d4c3 e3c3 14 215 21466 42193149 g6g5 h4h3 e5c4 b2c1 c4a5 h3h5 b8b3 c3e1 e6g4 e1d1 g4d1 f1 d1 a5c4 d1f1 14 215 24560 48855561 g6g5 h4h3 e5c4 b2c1 c4a5 h3h5 b8b3 c3e1 e6g4 e1d1 g4d1 f1 d1 a5c4 d1f1 >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 No it does not see a win for white even after Bc1 g5 and it suggests Rh6 -1.29/13 that means 1.29 pawns for black. Uri
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