Author: Bruce Moreland
Date: 09:22:35 02/23/98
Go up one level in this thread
On February 23, 1998 at 10:58:22, Amir Ban wrote: > >The latest installment in this best seller: > > >No. 681 (Rxh7): > >This is a bad one: Rxh7 Qxd1+. Worse, the simple Qh2 wins easily (h5 >Be2). > >Recommend: Changed key to Qh2. Not found in an hour on a P2/300. >No. 683 (Rxh2): > >I don't know about this. The continuation I analyze is 1... Rxh2 2.Kxh2 >Qh8+ 3.Kg1 Nxg4 4.Rf7 Qh2+ 5.Kf1 Qh1+ 6.Ke2 Qxg2+ (not Qxc1 7.Rf1) 7.Kd3 >Nf2+ 8.Rxf2 is unclear. > >Recommend: Drop it. Not found in an hour. >No. 684 (Nxh7): > >I don't find a continuation for this knight sacrifice. > >Recommend: Investigate. Mine finds this in almost exactly an hour but the score is +0.70. Perhaps it would go higher if I left it longer. >No. 686 (Bxh7+): > >Maybe it works but I cannot find better than a draw after 1.Bxh7+ Kxh7 >2.Qh5+ Kxg7 3.Rd1 > >Recommend: Investigate. Not found in an hour. >No. 687 (Bxh7+): > >I think it's bad: 1.Bxh7+ Kxh7 2.Nxf7 Kg6 is better than it seems, >though 3.h4 Qc6 4.h5+ Kh7 5.g6+ Kg8 6.h6 is scary. > >Recommend: Drop it. Found in 11 minutes, +2, 1. Bxh7+ Kxh7 2. Re4 Kg8 3. Rh4 etc. >No. 693 (Bxh7+): > >1.Bxh7+ Nxh7 2.g6 Nf8 black seems fine. > >Recommend: Investigate. Not found in an hour. >No. 698 (Bxh2+): > >It's probably bad 1...Bxh2+ 2.Kh1! and black is in trouble. > >Recommend: Drop it. Not found in an hour. >No. 699 (Bxh2+): > >I think I see a problem here: 1...Bxh2+ 2.Kxh2 Qh4+ 3.Kg1 Bxg2 4.Kxg2 >Rc6 5.Bf4! and white holds. > >Recommend: Drop it. Found in 12 minutes, but only +0.88. My line had 5. Rc6 instead of 5. Bf4. >No. 702 (Rxg7+): > >Rxg7+ is right, but Rxf7 is just as good (Kxf7 Rf5+). > >Recommend: Add Rxf7. > > >No. 706 (Rxg7): > >There seems to be something wrong with Rxg7, but fxe6 is clearly >winning: fxe6 Bxe6 Rxf6 game over. > >Recommend: Change key to fxe6. 2r2r1k/3b1pb1/p3pp1p/q2p1P1B/8/2N2RR1/P1PQ2PP/7K w - - 0 1 Rxg7 is a forced mate (found in about a minute). >No. 712 (Nxg2): > >This is bad: 1...Nxg2 2.Nxb7. A nice refuation on the opposite side of >the board. > >Recommend: Drop it. I get 1. Nxg2 as the best move, it takes about a minute to find, and it has a negative score. >No. 718 (Rxg7+): > >How is this supposed to work ? I see: 1.Rxg7+ Bxg7 2.Rg1 Rc8 3.Bxe4 Kf8 >4.Rxg7 b3! how does white improve on this ? > >Recommend: Investigate. I find this in two minutes with approximate equality (maybe a draw score, I can't tell), with 3. Rxg7+ rather than 3. Bxe4. >No. 719 (Nxg2): > >I can't see anything decisive out of the key. Qe6 looks like the best >move (+108). The threat of Qg4 wins a pawn at least. > >Recommend: Change key to Qe6. Not found in an hour. I have bxc4 with a similar score. >No. 722 (Rg3): > >1.Rg3 Bd7 2.Rxg7+ Kxg7 and what comes next ? > >Recommend: Investigate. Dunno. I find this in 14 minutes with an eventual score of +2.8, my PV is 1. Rg3 Qxf1+, so obviously black is giving up something at the root. >No. 725 (Rxg2+): > >Black can choose between two winning moves: Bh3 and Qf3, both look >better than the key. > >Recommend: Drop it. Not found in an hour. >No. 730 (Nxf7): > >I get Nxd7 (Nxd7 Bd6 +114). Nxf7 doesn't look less convincing. > >Recommend: Drop it. Found in 15 minutes, +2.3, as opposed to +1.6 for Rb1, which had been selected previously. >No. 754 (Bxf7+): > >I can't find a winning line: 1.Bxf7+ Kxf7 2.Qb3+ Ke8 3.Nd5 Bd6 > >Recommend: Investigate. Not found in an hour. >No. 758 (Bxf6): > >I am guessing that the intent is 1.Bxf6 gxf6 2.Nxf7 Kxf7 3.Qh7+ but I >don't see that this leads to a win. > >Recommend: Investigate. I only ran this for 20 seconds because I find it in 0.1 seconds, with an eventual score of +0.29, which says nothing. >No. 762 (Nxf7): > >I don't know how this is supposed to work. E.g. 1.Nxf7 Kxf7 2.Qe6+ Kf8 >3.Bb3 Nd5. > >Recommend: Investigate. Not found in an hour. >No. 764 (Nxf7): > >I have a bad position. White has three knights ? > >Recommend: Find the right position. r2rn3/1p3pk1/p1pNn1pp/q3P3/P7/1PN4P/2QR1PP1/3R2K1 w - - 0 1 It is pretty hard. >No. 766 (Nxf2): > >The best moves looks to be Bxh3 (Bxh3 Qh4). > >Recommend: Change key to Bxh3. Not found in an hour. >No. 767 (Bxf7+): > >This is unclear. Bxf7+ is the best move, but how does it win ? (1.Bxf7+ >Kxf7 2.Rxf5+ Kg7 3.d7 Nxd7 4.Qxd7+ Kh8). > >Recommend: Investigate. I only ran this for 20 seconds and have a negative score. >No. 769 (Bxf7): > >Be7+ is clearly better (Kg8 Bd6). > >Recommend: Change key to Be7+. Not found in an hour, Be7 is +4. >No. 799 (Nxg6+): > >Rxf5+ is better (exf5 Nd7+). > >Recommend: Change key to Rxf5+. I ran it for ten minutes. Rxf5 is +6, which is good enough for me.
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