Author: Howard Exner
Date: 11:20:07 01/23/98
Go up one level in this thread
On January 22, 1998 at 18:51:06, Amir Ban wrote: > >Here's some more work for everybody: > >No. 206 (Nxc7): > >Looks incorrect: Nxc7 Qxc7 Qd5+ Kh8 Bxd6 and now white has a nasty >surpise with Nb6. > >Recommend: Throw it out. Try Re8, instead of Bxd6? ie Nf6 2.Rxf8 Bxf8 3.Bb2 Bg7 4.Bc4 ... > > >No. 208 (Ndxf4): > >This just wins a pawn, but so does Nhxf4. > >Recommend: Side solution Nhxf4. Either move looks too easy also. >No. 215 (Rd7): > >This doesn't work: Rd7 Nxd7 Rxd7 and now I suppose Qc8 is expected and >crushed by Rxe7+, but instead black plays Rag8! >Recommend: Throw it out. Agree >No. 227 (Bxg7+): > >I find Qd7, and it seems as good as Bxg7+. Qe7 seems a bit inferior, but >that may be an illusion. >Recommend: Side solution Qd7. This one seems too easy if both moves are allowed. Bxg7 looks much better than Qd7. It results in the QN vs RR in a position where that QN combo is awesome. >No. 228 (Bg1+): > >Bg1+ indeed draws, but so does Bxg3+ even easier. > >Recommend: Side solution Bxg3+ Either way this looks too easy for most programs. > > >No. 231 (Rxd6): > >The point of the key is not obvious to me. I find Qh4+ which wins >material. > >Recommend: Change key to Qh4+. Check this out. 1.Rxd6! Qxd6 2.Rd1 Qb8 3.Rxd7 1-0. This looks quicker than Qh4. > > >No. 237 (Bf2+): > >Junior's recommendation for black here is to resign. Bf2+ seems like a >particularly bad move. Anyone can say what the point is here ? > >Recommend: Throw it out. Rebel plays Rd1+ immediately with a big plus. This should be the key move. Involves a Knight under promotion. > > >No. 247 (Bh7+): > >This is a difficult one. I have no doubt the key is correct, but I can't >see better than a draw. > >Recommend: No change. Agree as Bh7+ forces a nice win. > > >No. 271 (Nxc6): > >Qd8 is the right move here (score = 1235). White threatens mate in 2 and >picks up a queen and a few other pieces. > >Recommend: Change key to Qd8. Yes but now it is probably too easy. > > >No. 274 (Qxf3+): > >One of those where the cook is prettier than the original. The idea is >the discovered check d4, but Qxf3+ is sloppy execution. Nd2! is right. > >Recommend: Change key to Nd2. Agree and also the simple Ng5 should transpose as white's reply, Nd4 seems forced in both lines. Again, it is too easy. > > >No. 277 (Rh8+): > >I find Qg6 for a +1 score. Rh8+ may well win but I don't see how. > >Recommend: Investigation necessary. This is a keeper as white will eventually force Qxe6+ Kf8, then Qf5+! > > >No. 280 (Nxg7): > >Not an easy one. Nxg7 Kxg7 Bh6+ and white wins. > >Recommend: No change. Agree > > >No. 286 (Qh6+): > >I find mate in 11. > >Recommend: No change. Ditto for Rebel 8 in about 13 seconds > > >No. 287 (Qb5+): > >Looking at the position, the assignment "white wins" seems impossible. I >only see that Qb5+ draws, and so does Rc8+. > >Recommend: Investigation necessary. Both win after lots of forced checks and a Knight under promotion. The lines seemed forced for white and I think programs will stumble onto the win either initially or by accident rather quickly. > > >No. 291 (Rxb2): > >This one may be correct, but I can't find a win. > >Recommend: Investigation necessary. 1. .. Rxb2 2.Kxb2 Ba3+ 3.Kxa3 Rb8! is the winning line given in the book. Looks like it works. > >No. 293 (Qh2+): > >There are several ways to score +5 or more, like Rxf1+ and Qxh2+, but I >find Qh3 for +7. > >Recommend: Add Qh3 and Rxf1 as side solutions. Or it could be classified as too easy. > > >No. 297 (b4): > >I don't solve this one, but I think it's correct. b4 Bxb4 Ne4 and white >gets an advantage which may be only positional. This needs verification. > >Recommend: No change. Agree > > >No. 298 (Re6): > >I find Rf6 first, and then settle on h4. I score Re6 lower, but it >forces a KPKP endgame with a pawn up, so may be the simplest win. > >Recommend: Add Rf6 and h4 as side solutions. Re6 is probably best. GM's would handle this resulting position easily: 5k2/5q1p/p1p2Qp1/1pP5/4P3/8/PP4PP/6K1 w - - id=Pos 298 - ECM.EPD; bm=f6f7; The exchange to the endgame is best followed by b4! giving a tempo with an eventual a2-a3. > > >No. 300 (Kxd5): > >I find Bh2 Ke6 f5+ and this looks like a comfortable win. I don't see a >win after Kxd5 and it looks dubious. > >Recommend: Since Bh2 is trivial, throw it out. Yes it is easy but Kxd5 I think wins more quickly. The resulting N&pawns vs N&pawns ending is elementary. The other way still poses the problem of the two passed a pawns with the wrong colored bishop. It would still be an elementary win for strong humans. Computers would have to be careful not to lose the kingside pawns for a piece.
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