Author: Vine Smith
Date: 20:48:05 05/10/02
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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. > >--Jon Apparently, this line is so old that no modern sources bother giving refutations of previously rejected continuations, and I had to go back to MCO-10 to find the 15...Ng3 idea mentioned. The whole line, for those who want to look up more, goes 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 c5 8. dxc5 Nc6 9. cxd5 exd5 10. Nf3 Bf5 11. b4 O-O 12. Bb2 b6 13. b5 bxc5 14. bxc6 Qa5+ 15. Nd2, and now most books only discuss 15...Rab8 (which I learned from an even older source was originally recommended by the Czech analyst Katetov), but MCO-10 gives a note (in descriptive, of course) 15...Ng3 16. Qc3 Qxc3 17. Bxc3 Nxh1 18. g4! while 15. Rab8 is awarded an exclamation mark and is the main line. I think I trust the judgment of the GMs here, at least until more program analysis is done from the point following 18. g4! and not from several (forcing) ply beforehand. Incidentally, the opportunity for ...Ng6 exists at several earlier points after 10...Bf5, and a White g4 turns up in all the previous refutations, so it appears to be thematic. Regards, Vine Smith
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