Author: Howard Exner
Date: 10:45:07 01/28/98
Go up one level in this thread
Posted by Amir Ban on January 27, 1998 at 11:53:23: * *No. 315 (Rd6): *The idea of Rd6 seems to be 1.Rd6 Bxd6 2.Nf6+ Kh8 Here the book gives gxf6? and does not consider the better Kh8. *3.Rh4 h6 4.Rxh6+ gxh6 *5.Qh5 but black has the resource 5...Bf4 6.exf4 Qc5+. Junior prefers an *immediate Nf6+ with the idea of Bxf6 Be4 winning an exchange or a pawn. *Recommend: Change key to Nf6+, or discard. *No. 318 (Bd6): *Bd6 has the right idea, but the correct execution is Bxc7! Then if Rb7 *Bd6. An immediate Bd6 lets black off cheaply with Qxd5. The book misses the better Qxd5 and suggests Nf6? instead. *Recommend: Change key to Bxc7. *No. 321 (Rd5): *I play here Nd5 instead, but don't see a plus score. Black mustn't take *on d5, but after Rd5 Qc7 I don't see a continuation. Again the book only considers cxd5 and misses Qc7 which looks like it surprisingly holds despite the many white pieces buzzing around the black king. *Recommend: Discard. *No. 327 (Rxd7): *I don't find this. I think it works but I'm not sure. The idea seems to *be Rxd7 Nxd7 Qh5. Here is the book analysis: 1. Rxd7 Nxd7[1 ... Qxd7 2.Bxf6 gxf6 3.Nf5 +-]( my comment on this side line is that 3 .. Qd2 should hold but that Nf5 should be replaced by Rd1! first) 2.Qh5 Bc8 3.Nf5 Nf6 4.Bxf6 and so on. The question now is 2 ... Bc8 the best defense? If 2 ... b5 then simply Ba2 So it looks like this one should remain. *Recommend: No change (?). *No. 330 (Rxf6): *I find that the routine Re1 (+186) is more effective. *Recommend: Change key to Re1. The book gives a faulty side line in 1 ... Rxf6 2.Bxf6 Bxf6 3.Qf5 Kg8 4.Qh7+ Kf7(but Kf8 looks better) 5. Re1 +- *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. *No. 349 (Rxd5): *Maybe someone can find out the purpose of Rxd5: 1.Rxd5 Bxf2+ 2.Kh1 exd5 *3.Qxf7+ Kh8 leads white nowhere ? *Recommend: Discard. The book gives instead of Bxf2+, cxd5 but that is flawed too. Junk it. *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. *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. *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! *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? *No. 373 (Rh4): *The assignment is to draw and my solution is prettier: Qg7! Those damn computers! :-) *Recommend: Side solution Qg7. *No. 377 (d6): *Don't find what d6 does except lose a pawn. *Recommend: Discard. Book: 1.d6 cxd6 2.Rxe7 Qxe7 3.Nd5 Qe6 4.Nxf6 Bxf6 5.Bxf6 Qe3+ 6.Kh1 1:0 However, Nxd5 is better than Qe6 but black's position is not too good. May want to keep this one. *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. *No. 390 (Qe5): *1...Qe5 2.Qa3 Qe1 but then 3.Qa8+ draws by perpetual, and if black is *not careful he loses. The book line does play the careless Kb8 thinking that the perpetual is over but overlooks what you have already found, Qd8+! *Recommend: Discard. *No. 396 (Re6): *I would call this one (if it's correct) positional, because I can see *the logic of the move but can't find a decisive line. It's not obvious *that white has no other possibilities, or that black is hopelessly lost. *Recommend: Investigate. The book line faulters and appears to lose in a drawn position. This and many other positions demonstrates what I believe to be a great strength in computer chess play, namely strong defensive play. Many humans get discouraged or panic in apparently hopeless situations. Lasker, one of my favourites, excluded of course. *No. 397 (Rhg8): *The key is spectacular, but pointless I think, since white can play a *calm Rf2 leaving black with nothing. *Recommend: Discard. The book side line for Rf2 goes astray. 1.Rf2 Rd5 2.Qf6 Rf5 3. Qe7(why not Qd4 instead?) Qd5-+
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