Author: Amir Ban
Date: 04:19:05 01/29/98
Go up one level in this thread
On January 28, 1998 at 13:45:07, Howard Exner wrote: >Posted by Amir Ban on January 27, 1998 at 11:53:23: * > > >*No. 336 (Rxd4): > >*I find Bxe5! as a free gain of a pawn. I don't know what the point of >*Rxd4 is. > >*Recommend: Change key to Bxe5. > >#335 >Book: 1... Rxd4 2.Rxd4 Be5 3.Rd8 f5 4.Kh3 Rxf2 5.Rd3 Kh5 0-1 >To avoid this line I think white will have to drop all the pawns >which is also hopeless. Is there a defense for white? The mate theme >is pretty. > This one's 335 of course. In the line above black mustn't play 5.Rd3 but let the f-pawn go. Is the win of R+B+3P vs R+R easy ? Should compare it to the position after 1...Bxe5 2.Rxe5 Rxd4+ 3.Kf3. I evaluate the two positions about the same. Which of these is actually won ? >*No. 354 (Qxf3): > >*This one's unclear. 1...Qxf3 2.Nxf3 Rxh3+ 3.Kg1 Rxf3 is a nice position >*for black but I don't see a decisive line. This may be meant as a >*positional sacrifice. It doesn't look inferior to any other >possibility, >*which may be a basis for accepting it. > >*Recommend: Investigate. > >Book continues with 3 white replys: Nc4, Qd1 and Qh2 which all fail. >Rebel 8 suggests Qb4 with the following position: >5rk1/2p3pp/p1p5/2P1p3/1Q1pPn2/1P3r2/PN6/R5K1 b - - id "Pos 354 - >ECM.EPD" >Now here black should avoid a draw sequence and play h5! which >gives his king some breathing room so that the rook on f8 can >be lifted. So for now it looks ok to play Qxf3 but programs may >play this to draw initially. > I got as far as Qb4 h5 but remained unconvinced. I have a positive score here, but I don't see a forced win and it's not clear how long black can maintain the threats and contain the white pieces. If he can't he may lose. >*No. 366 (Rxd8): > >*I think this one's wrong. 1.Rxd8 Qxd8 2.Qh4 Kg8 3.Rxf6 white gets two >*minor pieces for a rook, but will be sorry he did after 3...Qb6 which >*gives black a strong counterattack. > >*Recommend: Discard. > >The book only considers Bc4 instead of Kg8. >As white I would continue your above line with 4.h6! Qxb2(what else?) >5.Rh6! f6 6.Rxh7 1-0 but there might be some better play for black >after h6. If this holds then Rxd8 is good. > I suppose you mean 4.h3? Then try 4...Rc6. All continuations are unclear: 5.Rh6 gxh6 6.Bf6 Qe3 or 5.Nd1 Rxc2 or 5.Qg3 Kf8 or 5.Bh6 gxh6. > >*No. 367 (Rd5): > >*I have no clue here. A black rook is en prise and Junior just takes it >*Bxf8 for a score of 266. Anything wrong with that ? Instead Rd5 places >a >*white rook en prise for no obvious purpose. > >*Recommend: Discard. > >The book move is the pretty Nxd5! > You mean Nd5. This move's correct but my version of ECM says Rd5. So this is a typo. Conclusion: Key move is Nd5. >*No. 371 (Rxd5): > >*I think this is based on faulty defense: 1.Rxd5 cxd5 2.c6 Bc8 3.Ba6 Ka8 >*and black is not in trouble. > >*Recommend: Discard. > >This is a long Nolot kind of position unless there is a flaw in the >following book >line: 1.Rxd5 cxd5 2.c6 Bc8 3.Ba6 Ka8 4.Nd4!! Qg4+ 5. Kb1 Qe3 6.Bb7+ Kb8 >7. Rd1 Be7 8.Qb5 1-0. Be7 is poor but I can't see a defense at this >point. Is there >a better defense earlier on though? > How about 5...Qg4 ? >*No. 381 (e5): > >*I choose fxe6 (Bxe6 Nd4 or fxe6 e5) which evaluates about the same as >*e5. Both options are not decisive in my opinion. > >*Recommend: Discard. > >Book: 1.e5 dxe5 2.Ne4 Qb6 3.Nd6+ Ke7 4.Nxe5! fxe5 5.f6! bxf6 >6. Rxf6 and according to the book white will mate or win big material. >If this is all forced then e5 looks stronger than fxe6. > This works well with the black queen on b6, but if 2...Qc6 the same continuation doesn't work well. Black can play Rcf8 (best) or even Kxf6. Amir
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