Author: Ernst A. Heinz
Date: 10:06:35 01/20/98
Go up one level in this thread
On January 20, 1998 at 10:49:03, Amir Ban wrote: >No. 153 (Qd8): > >Right, but Qd6 is equally good. > >Recommend: Add Qd6 as side solution. Yes, at high depths both score > +11. >No. 162 (Rd7+): > >I find Rb8 which also wins, though Rd7+ analysis proves it's correct. > >Recommend: No change, or add Rb8 as side solution. Maybe Rb8 also wins but "DarkThought" sticks to Rd7+ from iteration #9 (score = +1.8) and fails high on it in iteration #11 with a score of +3.4. PV = 1. Rd7+ Bxd7 2. Nd5+ Ke8 3. Qf6 Ng7 4. Be5 Qxe5+ 5. Qxe5+ Be6 ... >No. 180 (Bd4): > >This must be a typo. Correct is Bc4. > >Recommend: Change key to Bc4. "DarkThought" agrees (score = +3.1 after iteration #14). >No. 186 (Nxh6): > >Nxh6 is crushing. I find Qe8 which is good for only +4. > >Recommend: Add Qe8 as side solution. R1b7 seems to be good as well -- actually, there seem to be many good moves in this position. If none of them clearly stands out, I would drop the position. >No. 187 (Nxe7): > >A hard one for me. The object of Nxe7 was not clear but after Nxe7 Nxe7 >Rb3 it turns out that it's correct, and is meant to decoy the knight so >as to trap the black queen. > >Recommend: No change. Yes, this position is very difficult and it is solved correctly only if the program scores the resulting position > +1.5 -- otherwise alternative moves like e.g. Bb5 seem to score equally well (around +1). >No. 190 (Nd7): > >I can't attach any meaning to the key move. I find Ne7+ so this may be >another typo. Ne7+ Kh8 Rd8! looks correct but doesn't do more than win a >pawn. > >Recommend: Change key to Ne7+. "DarkThought" agrees. >No. 191 (Bd3): > >I have difficulty in finding the key move, but Bd3 Qxd3 Rg1+ is indeed >crushing. I do find Qd4 for a score of 3.5. > >Recommend: No change. "DarkThought" scores both Qd4 and Bd3 > +5 in iteration #13 but finally sticks to Bd3 with a score of +6.9 after iteration #14. I would add Qd4 as a side solution. >No. 193 (Nb6): > >Correct, but a tough one, because there's an apparent defense that >ultimately fails. The idea is 1.Nb6 Nxb6 2.Rc7 Qxc7 3.Qxe6+ wins. >Apparently black has 2...e5, which closes out the bishop and holds, but >further analysis shows that 3.Rxd7 Rxd7 4.Qe6+ Kh8 5.Nf7+ Kg7 6.Bc1 >wins. > >Recommend: No change. This position seems to be prone to "right" solutions due to wrong reasons again or 2.. h5 is a refutation of the winning plan. "DarkThought" finds Nb6 in iteration #10 after 28 sec with a draw score (PV = 1. Nb6 Nxb6 2. Rc7 h5 3. Qe4 Qe8 4. Qxe6+ Kg7 5. Bb2+ Kh6 ...) and does not see a win within 10 min after finishing iteration #14. >No. 198 (Ba6): > >I find Nc5 immediately. It's easy and wins a whole rook. Don't know what >the point of Ba6 was, but looks like they overlooked the simpler and >better possibility. > >Recommend: Change key to Nc5. "DarkThought" agrees, Ba6 scores only +3.4 whereas Nc5 gets > +5. =Ernst=
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