Author: Dann Corbit
Date: 12:26:32 05/11/02
Go up one level in this thread
On May 10, 2002 at 22:35:02, Jon Dart wrote: >There's a known position in the Classical Nimzo-Indian as follows: > >[D] r4rk1/p4ppp/2P5/q1pp1b2/4n3/P7/1BQNPPPP/R3KB1R b KQ - - > >Crafty has a book line here continuing Rab8 c7. My database shows several games >with this line, including Rogers-Ward, BCF ch-T 1997-8, a draw. Eliskases played >d4 against Bololjubow in 1937, another draw. But a search from this position >gives the continuation Ng3, with advantage to Black: > > > 10 3.31 -- 1. ... Ng3 > 10 3.99 -0.98 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4. > Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8 > 10-> 10.66 -0.98 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4. > Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8 > 11 13.44 ++ 1. ... Ng3!! > 11-> 29.14 -1.37 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4. > Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8 > 12 34.77 -- 1. ... Ng3 > 12 37.50 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1 > 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7. > f3 d3 8. fxg4 Rxe2+ > 12-> 1:55 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1 > 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7. > f3 d3 8. fxg4 Rxe2+ > 13 2:07 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1 > 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7. > f3 d3 8. fxg4 Rxe2+ > time=3:20 cpu=99% mat=3 n=133137602 fh=93% nps=664k > ext-> chk=5470267 cap=361754 pp=602423 1rep=458117 mate=32558 > predicted=0 nodes=133137602 evals=24036969 > endgame tablebase-> probes done=0 successful=0 > hashing-> trans/ref=22% pawn=6% used=99% > >Arasan and Hiarcs give a similar result, at least at a few minutes' search time. >Ng3 is surprising, to say the least. Whether it's really good or not, I'm not >sure. Long time analysis with Yace (featuring a hash collision): usetime = 49999.00, mintime = 49999.00 maxtime = 49999.00 tl 49999.00 ml 0 5 0.023 -3.22 1t 1...Qxd2+ 2.Qxd2 Nxd2 3.Kxd2 {-350} 23 0.024 -1.92 1t 1...Nxf2 {-270} 60 0.024 -1.92 1. 1...Nxf2 {-270} 129 0.025 -1.92 2t 1...Nxf2 2.Qxf5 {-620} 1547 0.030 -1.47 2++ 1...Ng3 2.e4 Nxh1 3.exf5 {-200} 1611 0.030 -1.47 2t 1...Ng3 2.e4 {-350} 1759 0.031 -1.47 2. 1...Ng3 2.e4 {-350} 1975 0.032 -1.47 3t 1...Ng3 2.e4 Nxh1 {150} 3075 0.035 -1.47 3. 1...Ng3 2.e4 Nxh1 {150} 4338 0.038 -1.07 4++ 1...Ng3 2.fxg3 Bxc2 3.Bxg7 {231} 4583 0.039 0.01 4++ 1...Ng3 2.fxg3 Bxc2 3.Bxg7 {231} 6389 0.045 0.61 4t 1...Ng3 2.Qb3 Nxh1 3.Qxd5 {70} 8943 0.051 0.61 4. 1...Ng3 2.Qb3 Nxh1 3.Qxd5 {70} 14442 0.065 0.84 5t 1...Ng3 2.e4 Bxe4 3.Qc3 Qxc3 4.Bxc3H Nxh1H 5.Nxe4H dxe4H 6.Bxg7H {140} 22010 0.077 0.84 5. 1...Ng3 2.e4 Bxe4 3.Qc3 Qxc3 4.Bxc3 Nxh1 5.Nxe4 dxe4 6.Bxg7 {140} 44879 0.126 0.45 6t 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1H Bf5H 5.Rxc5H {70} 72469 0.186 0.45 6. 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Bf5 5.Rxc5 {70} 107459 0.262 0.33 7t 1...Ng3 2.Bc3 Qc7 3.e4 Nxh1 4.exf5 Rae8+ 5.Be2 Qxc6 {-120} 390506 0.907 0.33 7. 1...Ng3 2.Bc3 Qc7 3.e4 Nxh1 4.exf5 Rae8+ 5.Be2 Qxc6 {-120} 518639 1.197 0.42 8t 1...Ng3 2.Bc3 Qc7 3.Qb3 Nxh1 4.Qxd5 Be6 5.Qe5 Qxe5 6.Bxe5 {70} 1070068 2.442 0.42 8. 1...Ng3 2.Bc3 Qc7 3.Qb3 Nxh1 4.Qxd5 Be6 5.Qe5 Qxe5 6.Bxe5 {70} 1386067 3.161 0.46 9t 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5 Rac8 6.c7 d4 {70} 6478661 15.045 0.46 9. 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5 Rac8 6.c7 d4 {70} 7494841 17.634 0.34 10t 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5 Rac8 6.c7 d4 7.Ne4 {70} 31202627 1:20.5 0.34 10. 1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5 Rac8 6.c7 d4 7.Ne4 {70} 37527271 1:39.2 0.73 11t 1...Ng3 2.Bc3 Qd8 3.Qb2 Nxh1 4.Bxg7 Re8H 5.Bh6H d4H 6.c7H Qxc7H 7.O-O-OH {HT} 63228428 2:40.2 0.73 11. 1...Ng3 2.Bc3 Qd8 3.Qb2 Nxh1 4.Bxg7 Re8 5.Bh6 d4 6.c7 Qxc7 7.O-O-O 86040120 3:45.3 0.95 12t 1...Ng3 2.Qc1 Nxh1 3.g4 Bxg4 4.f3 Bf5 5.Bg2 Qc7 6.f4 Nf2 7.Kxf2 Qxc6H {-30} 138725413 5:55.9 0.95 12. 1...Ng3 2.Qc1 Nxh1 3.g4 Bxg4 4.f3 Bf5 5.Bg2 Qc7 6.f4 Nf2 7.Kxf2 Qxc6 {-30} 169151231 7:24.9 0.71 13t 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.f3 Bf5H 6.Bg2H Rac8H 7.Rd1H {HT} 536981207 23:40.3 0.71 13. 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.f3 Bf5 6.Bg2 Rac8 7.Rd1 700714127 31:47.1 0.75 14t 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2 d4 6.Ba5 Rae8 7.f3 d3 8.fxg4 Rxe2+ 9.Kf1 {HT} {-40} 1647988257 1:14:16 0.75 14. 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2 d4 6.Ba5 Rae8 7.f3 d3 8.fxg4 Rxe2+ 9.Kf1 {HT} {-40} 1983902474 1:33:02 0.88 15t 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2 d4 6.Bxd4 cxd4 7.Bxh1 Re7 8.Nb3 Rd8 9.Rd1 d3 {80} +---+---+---+---+---+---+---+---+ 8| r | | | | | r | k | | +---+---+---+---+---+---+---+---+ 7| p | | | | | p | p | p | +---+---+---+---+---+---+---+---+ 6| | | P | | | | | | +---+---+---+---+---+---+---+---+ 5| q | | p | p | | b | | | +---+---+---+---+---+---+---+---+ 4| | | | | n | | | | +---+---+---+---+---+---+---+---+ 3| P | | | | | | | | +---+---+---+---+---+---+---+---+ 2| | B | Q | N | P | P | P | P | +---+---+---+---+---+---+---+---+ 1| R | | | | K | B | | R | +---+---+---+---+---+---+---+---+ a b c d e f g h setboard r7/p4pkp/2P5/q2p1Q2/n7/P1p5/3NBPPP/2R1K2R w K - 0 8 hashmove c3d4 haskey 0xe463530b,0x9efe437c Warning table move 0x6d2 invalid, nodes 2376155340, rep 5108184 3790158875 2:54:42 0.88 15. 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2 d4 6.Bxd4 cxd4 7.Bxh1 Re7 8.Nb3 Rd8 9.Rd1 d3 {80} 388320688 3:44:20 0.91 16t 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2 d4 6.Bxd4 cxd4 7.Bxh1 Rab8 8.c7 Rb2 9.Rc1 h6 {HT} {80} 3246586073 9:17:03 0.91 16. 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2 d4 6.Bxd4 cxd4 7.Bxh1 Rab8 8.c7 Rb2 9.Rc1 h6 {HT} {80} 2012453291 12:06:03 0.72 17t 1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2 Rfe8 6.f3 Bf5 7.Bxh1 Re3 8.Ne4 dxe4 9.Kd2 Rxc3 {HT} {580}
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