Author: Amir Ban
Date: 08:31:02 03/09/98
This is the last installment in the ECM errata report. I've been busy with other matters recently, so this took some time. I did not review yet Howard's and Bruce's comments to the latest batch, but, on experience, they are reliable. I hope now Don and others can take on this and compile the ECM98 suite. No. 810 (Rxg6+): Is the intent here: 1.Rxg6+ hxg6 2.Nxg6 fxg6 3.Qc2 ? If so 3...Ne5 4.dxe5 Ne4. Recommend: Drop it. No. 818 (Rxg6+): Rxg6+ evaluates to around +4. I find e4, threatening Rxg6+. I evaluate it higher at +5.6. Recommend: Add e4. No. 824 (Nxf3): Rxf3 also works, and evaluates about the same (+2.8). Recommend: Add Rxf3. No. 827 (Rxf3): I find 1...Rxf3 2.gxf3 Qh4 3.Re1 and white's mate threat makes this line doubtful. Junior prefers a quiet Qh4. Recommend: Investigate. No. 833 (Nf6+): I can't find a convincing line after Nf6+ gxf6, but the quiet Qg3 seems to win (+122). Recommend: Drop it. No. 841 (Nxe6): I find this line 1.Nxe6 Qxe6 2.Nd5 Kd8 3. Qd2 Qe5, which is not good enough. Recommend: Investigate. No. 846 (Rxe3): I'm not convinced: 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 is not worth Black's trouble. Recommend: Investigate. No. 852 (Rxb2): Nd3+ is even better (Rxd3 is forced. If Bxd3 Bxc3). Recommend: Add Nd3+ No. 856 (Rf1): Black needs to draw. It's probably right, but too deep for me. I see 1... Rxf1 2.Rxf1 Rxf1 3.Qe2 Bg1+ 3.Kh1 Rc1 but it's not over yet. Recommend: Investigate. No. 858 (Bxh2+): Hard to make a ruling on this: 1...Bxh2+ 2.Kxh2 Qh4+ 3.Kg1 fxg2 4.Kxg2 Rxf2+ 5.Qxf2 Qg4+ black can probably get a perpetual here, but to prove it is not easy. Recommend: Investigate. No. 860 (Qd8+): This is bad. The assignment "white to draw" assumes that black is winning, which is not the case. I find Qd3 +155. If 1...bxa4 2.Bxf7+! wins. Recommend: Drop it. No. 864 (Nf5): (Black to draw) This is probably bad: 1...Nf5 2.Qxd5 Ng3+ 3.Kh2 (I think even Kg1 is good enough to win) Ng1+ 4. Kg1 Qh2+ 5.Kxf1 Qf4+ 6.Ke2 Qxc1 7.Qxf7+ black is lost. Recommend: Drop it. No. 865 (Nxg5): Nxg5 draws, right, but who wants to draw here ? I get a plus score for a5. Recommend: Drop it. No. 866 (Rg8+): The idea is that Kh5 loses and Kh6 is a perpetual after Ne5, but what about Kh4 ? I get this breathtaking line: 1...Kh4 2. Qe2 Bb5 3.f3 Bxd3 4.Qe1+ g3! 5.Rg4+ Qxg4 6.fxg4 Be4! and I count this as good for black. Recommend: Drop it. No. 867 (Rxh5): Why does white want to draw here ? Recommend: Drop it. No. 875 (Qg1+): Why does black want to draw ? I want to play 1...Bxc5 2.Rxc5 when 2...f5 or 2...Qf6 are to black's advantage. In any case, if black insists on a draw, he can play 2...Qg1+ now, so this is at least a cook. Recommend: Drop it. No. 879 (Rd2): This is unclear. First, Rd2 does draw (2. Qxd2 Nxf2+ 3.Kg1 Nxe4, or 2.Qc3 Rxb2 etc.), but then so does Nxf2+ by transposition. Second, I play Nxf2+ with intent of maintaining a black advantage, though this may be wrong. My line is: 1...Nxf2+ Kg1 2.Nd3 Bxd3 3.Qxd3 Qg6+ 4.Kf2 Qg2+ 5.Ke3 Qxb2 unclear. Recommend: Drop it. Amir
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.