Author: Eelco de Groot
Date: 19:02:05 09/24/01
Go up one level in this thread
On September 24, 2001 at 17:30:02, Michel Langeveld wrote: >On September 24, 2001 at 13:47:44, Peter Berger wrote: > >>On September 24, 2001 at 13:32:52, Michel Langeveld wrote: >> >>>ECM 1621 >>> >>> r2q3r/2pkb1p1/p2p1n2/4p1p1/Pp2P1P1/1QP5/1P1P2PP/RNB2RK1 b - - 0 1 >>> >>>Is 1 .. Rxh2 really winning. >>> >>>I see a +2.38 after 1 .. Rxh2 2 Kxh2 ( 2 ... Qh8+ 3. Kg1 Nxg4 4 Rf7 Qh2 5 Kf1 >>>Rh8 6 cxb4 Qh1+ 7 Ke2 Qxg2+ 8 Kd3 Rh3+ 9 Kc2) >>> >>>but wat after: >>> >>>1 .. Rxh2 2 Rxf6! >>> >>>for example: >>> >>>2 ... gxf6 3 Kxh2 Qh8+ 4 Kg1 Qh4 (-0.91) >>> >>>Michel >> >>Why take back here ? How about 2...Qh8 ? >> >>A sample line: 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf7 Qh4 6.Kf1 Rh1+ 7.Ke2 Qg3 8.Rf3 Qxg2+ >>9.Rf2 Qxg4 10.Kd3 Rb8 -+ >> >>This is not supposed to be an analysis but 2...Qh8 looks at least very >>promising. > >Ok, but I think I can keep draw with 2 ... Qh8. 8 Rf3 is a horrible move. >better seems to be: 8. d4 Re1+ 9. Kd2 Rh8 10. Kc2 Rxc1+ 11. Kb3 bxc3. > >I think black can keep a small advantage with Ed's variation That is funny, 2. ..Qh8 is also the move that Q5T stubbornly wants to keep playing. It has no trouble choosing 1. ..Rxh2 2.Rf6 at four ply deep although Rxh2 is only the 24th move it tries at that depth. It switches back to 1. ..Qg8 a few times. But its second move in the line from the rootposition is at the moment still 2. ..Qh8 Game begin 00:00 04.24 -0.62 1..Rxh2 2.Rxf6 Qh8 3.Qe6+ Kd8 4.Rf1 Rh1+ 00:00 05.00 0.46 1..Rxh2 2.Rxf6 Qh8 3.Qe6+ Kd8 4.Rf1 Rh1+ 5.Kf2 00:02 06.00 0.05 1..Rxh2 2.Rxf6 Qh8 3.Qe6+ Kd8 4.Rf1 Rh6 5.Qc4 Rh1+ 00:03 07.00 -0.81 1..Rxh2 2.Kxh2 Nxg4+ 3.Kg1 Qh8 4.Rf7 Qh2+ 5.Kf1 Qh1+ 6.Ke2 c6 7.Qd1 Qxg2+ 8.Ke1 00:05 07.02 -0.57 1..Qg8 2.Qxg8 Raxg8 3.h3 Nxe4 4.cxb4 Rf8 5.Rxf8 Rxf8 6.d3 Nf2 00:09 08.00 -0.36 1..Qg8 2.Qxg8 Raxg8 3.d3 d5 4.exd5 Bc5+ 5.d4 exd4 6.c4 Nxg4 7.Rf7+ 00:12 08.01 -0.36 1..Rxh2 00:24 09.00 -0.38 1..Qg8 2.Qxg8 Raxg8 3.h3 Nxe4 4.cxb4 Rb8 5.b5 Ng3 6.Rf2 Ne4 7.Rf7 axb5 00:32 09.01 -0.38 1..Rxh2 00:58 10.00 -0.38 1..Qg8 2.Qxg8 Raxg8 3.h3 bxc3 4.Nxc3 d5 5.d3 Nxg4 6.Nxd5 Bc5+ 7.Kh1 Nf2 8.Kh2 Nxd3 01:24 10.01 -0.38 1..Rxh2 04:28 10.01 -0.38 1..Rxh2 04:33 10.01 1.27 1..Rxh2 2.Kxh2 Nxg4+ 3.Kg1 Qh8 4.Rf7 Qh2 5.Kf1 Qh1+ 6.Ke2 Qxg2+ 7.Kd3 Rh8 11:03 11.00 1.73 1..Rxh2 2.Rxf6 Qh8 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf7 Rh1+ 6.Kf2 Qh4+ 7.Ke2 Qg3 8.Rf3 42:46 12.00 1.87 1..Rxh2 2.Rxf6 Qh8 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf3 Qh4 6.Kf1 After entering 1. ..Rxh2 the reply 2.gxf6 is in the list for a while but then it is back to 1. ..Qh8. Last Move : 1.Rxf6 (Black to play) (A small bug probably somewhere in the PGN handling of the analysis window , it should say 2.Rxf6) 00:00 05.00 0.13 2..Qh8 3.Qe6+ Kd8 4.Rf1 Rh1+ 5.Kf2 00:01 06.00 1.81 2..Qh8 3.Qe6+ Kd8 4.Rf7 Rh1+ 5.Kf2 Qh4+ 6.Ke2 00:01 07.00 1.81 2..Qh8 3.Qe6+ Kd8 4.Rf7 Rh1+ 5.Kf2 Qh4+ 6.Ke2 Qe1+ 7.Kd3 00:03 08.00 0.00 2..Qh8 3.Qe6+ Kc6 4.Qd5+ Kd7 5.Qe6+ Kc6 6.Qd5+ Kd7 00:07 09.00 0.00 2..Qh8 3.Qe6+ Kc6 4.Qd5+ Kd7 5.Qe6+ Kc6 6.Qd5+ Kd7 00:39 10.00 1.41 2..Qh8 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf3 Rh1+ 6.Kf2 Qh4+ 7.Ke2 Ka7 8.Qc6 Qe1+ 9.Kd3 01:48 11.00 1.45 2..Qh8 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf3 Rh1+ 6.Kf2 Qh4+ 07:50 12.00 1.44 2..Qh8 3.Qe6+ Kc6 4.Qd5+ Kb6 5.Rf3 Rh1+ 6.Kf2 Qh4+ 09:33 12.10 1.44 2..gxf6 09:43 12.10 1.60 2..gxf6 3.Kxh2 Qh8+ 4.Kg1 Qh4 5.Kf1 Qh1+ 6.Ke2 Qxc1 7.Qc4 Qxb2 12:33 13.00 1.12 2..gxf6 3.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Qf1 53:26 13.01 1.12 2..Qh8 41:49 13.01 1.96 2..Qh8 3.Qe6+ Kc6 4.Rf3 Rh1+ 5.Kf2 Qh4+ 6.Ke2 An possible explanation for this can be seen if one enters 2.Rxf6 gxf6; the lines following that remain much the same in Q5T but the evaluation goes up and down a lot. At the moment here resolving a fail-high again at the fifteenth ply. So that means that the position is looking less unfavourable for White again at fifteen ply evaluation, if Black plays 2. ..gxf6. Last Move : 2... gxf6 (White to play) 00:00 06.00 1.20 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Qe1+ 6.Qf1 00:00 09.00 0.58 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Kf1 Qxg4 7.Kf2 00:06 10.00 -1.52 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Kf1 Qh1+ 6.Ke2 Qxc1 7.Qc4 Qxb2 8.Qa2 Qxa2 00:26 11.00 -1.03 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Kf1 Qh1+ 7.Kf2 Qxc1 8.Ke2 Ke8 9.Qxc7 00:51 12.00 -2.03 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Kf1 Qh1+ 6.Ke2 Rh8 7.Qd5 c6 8.Qc4 08:46 13.00 -1.27 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Qf1 b3+ 7.Qf5 24:32 14.00 -2.52 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Qf1 bxc3 7.Qf5+ Ke8 8.Qg6+ If 2. ..Qh8 is playable then that 4.24 line at the top is already reasonably good. Just in: fifteenth ply fail-high resolved: 27:15 15.00 -0.98 2.Kxh2 Qh8+ 4.Kg1 Qh4 5.Qc4 Rh8 6.Qf1 d5+ 7.exd5 Qg3 8.d4 This is a bit confusing as the first move number is not correct; it should be 3.Kxh2 Qh8+ 4.Kg1
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