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Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Qa4
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Vincent Lejeune



Joined: 09 Mar 2006
Posts: 3934

PostPost subject: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Qa4    Posted: Fri Nov 24, 2017 1:20 am Reply to topic Reply with quote

From the article : https://en.chessbase.com/post/tcec-superfinal-houdini-vs-komodo

Quote:
...needed only 16 seconds to find 1.Qxd7! ...still shows the clearly weaker move 1.Qa4.

In 2 best lines mode, McBrain 3.0 continues to prefer Qa4. And it seems right.
Why does CB claims Qxd7 is better than Qa4 ?

Code:
FEN: r2r2q1/2Rn2bk/b2N2pp/pQ2p3/4Pp2/B4N1P/5PP1/2R3K1 w - - 2 31

McBrain_2017_v30_TCEC-x86-64-modern:
...
 33/52   00:58    584 740k   10 079k   +3,39   31.Qxd7 Rxd7 32.Rxd7 Be2 33.Rcc7 Bxf3 34.Bb2 Rd8 35.Re7 Rxd6 36.Bxe5 Rd1+ 37.Kh2 Be2 38.Rxg7+ Qxg7 39.Rxg7+ Kh8 40.Rxg6+ Kh7 41.Rg7+ Kh8 42.f3 Rf1 43.Ra7+ Kg8 44.Rxa5 Rb1 45.Bxf4 Rb6 46.h4 Ra6 47.Rc5 Bd1 48.Kg3 Kg7 49.h5 Bb3 50.Rc7+ Kf8 51.Rc8+ Kg7 52.Be5+ Kf7 53.Rc7+ Kg8 54.Kf4 Bd1 55.Rc8+ Kf7 56.Rc1 Be2
 33/66   00:58    584 740k   10 079k   +3,99   31.Qa4 Qe6 32.Kh2 Nb6 33.Qxa5 Rxd6 34.Bxd6 Qxd6 35.R1c6 Nc4 36.Rxd6 Nxa5 37.Nxe5 Rc8 38.Rxg7+ Kxg7 39.Rxg6+ Kh7 40.Rxa6 Nb3 41.f3 Nd4 42.Rd6 Ne2 43.Rd7+ Kg8 44.Ng6 Re8 45.Ne7+ Kf8 46.Nf5 Re6 47.Rh7 Nc3 48.h4 Nd1 49.Rxh6 Rxh6 50.Nxh6 Kg7 51.Nf5+ Kf6 52.g4 Nf2 53.h5 Kg5 54.Nd4 Nd3 55.Kg2 Kf6 56.Kh3 Kg5 57.Ne6+ Kf6
---------------------------------------------------------------------------
 34/57   01:38    1 006 303k   10 244k   +3,39   31.Qxd7 Rxd7 32.Rxd7 Be2 33.Rcc7 Bxf3 34.Bb2 Rd8 35.Re7 Rxd6 36.Bxe5 Rd1+ 37.Kh2 Be2 38.Rxg7+ Qxg7 39.Rxg7+ Kh8 40.Rxg6+ Kh7 41.Rg7+ Kh8 42.f3 Rf1 43.Ra7+ Kg8 44.Rxa5 Rb1 45.Bxf4 Rb6 46.h4 Ra6 47.Rc5 Bd1 48.Kg3 Bb3 49.h5 Kf8 50.Rc7 Kg8 51.Rc8+ Kg7 52.Be5+ Kf7 53.Rc7+ Kg8 54.Kf4 Bd1 55.Rc1 Ba4 56.Rc8+ Kf7 57.g4 Bd1 58.Rc7+ Ke8 59.Rc1
 34/72   01:38    1 006 303k   10 244k   +4,08   31.Qa4 Qe6 32.Kh2 Nb6 33.Qxa5 Nd7 34.Qe1 Bd3 35.Bb4 Ra6 36.Nb7 Rda8 37.Qd2 Bb5 38.Nc5 Nxc5 39.R1xc5 Rd6 40.Qc3 Bd7 41.Rxe5 Bxe5 42.Qxe5 Rc6 43.Qxe6 Rxe6 44.Rxd7+ Kg8 45.e5 g5 46.Be7 Rg6 47.Nd4 Ra4 48.Bf6 Ra6 49.h4 gxh4 50.Nf3 Rg4 51.Kh3 h5 52.Nxh4
---------------------------------------------------------------------------
 35/62   02:37    1 625 161k   10 331k   +3,50   31.Qxd7 Rxd7 32.Rxd7 Be2 33.Rcc7 Bxf3 34.Bb2 Rd8 35.Re7 Rxd6 36.Bxe5 Rd1+ 37.Kh2 Be2 38.Rxg7+ Qxg7 39.Rxg7+ Kh8 40.Rxg6+ Kh7 41.Rg7+ Kh8 42.f3 Rf1 43.Ra7+ Kg8 44.Rxa5 Rb1 45.Bxf4 Rb6 46.h4 Bf1 47.Rc5 Rf6 48.Kg3 Rb6 49.Kf2 Ba6 50.g4 Bb7 51.Be5 Bc6 52.Kg3 Ba4 53.Rc8+ Kf7 54.Bf4 Kg7 55.h5 Kf7 56.Rd8 Ra6 57.Rh8 Kg7 58.Rc8 Kf7 59.Kf2 Bd1 60.Rd8 Bb3
 35/60   02:37    1 625 161k   10 331k   +4,28   31.Qa4 Qe6 32.Kh2 Nb6 33.Qxa5 Nd7 34.Qe1 Rdb8 35.R1c6 Bd3 36.Nc4 Bxc4 37.Rxe6 Bxe6 38.Qc3 Ra6 39.Qd3 Rba8 40.Bb2 R8a7 41.Rxa7 Rxa7 42.Qd6 Nf8 43.Bxe5 Rd7 44.Qc5 Bg8 45.Qc8 g5 46.Bxg7 Kxg7 47.Ne5 Re7 48.Qc3 Re6 49.Ng4+ Kf7 50.Qc7+ Kg6 51.Qd8 Kg7 52.Qd4+ Kf7 53.Qc3
---------------------------------------------------------------------------
 36/60   02:57    1 830 411k   10 308k   +3,50   31.Qxd7 Rxd7 32.Rxd7 Be2 33.Rcc7 Bxf3 34.Bb2 Rd8 35.Re7 Rxd6 36.Bxe5 Rd1+ 37.Kh2 Be2 38.Rxg7+ Qxg7 39.Rxg7+ Kh8 40.Rxg6+ Kh7 41.Rg7+ Kh8 42.f3 Rf1 43.Ra7+ Kg8 44.Rxa5 Rb1 45.Bxf4 Rb6 46.h4 Bf1 47.Rc5 Rf6 48.Kg3 Rb6 49.Kf2 Ba6 50.g4 Bb7 51.Be5 Bc6 52.Kg3 Ba4 53.Rc8+ Kf7 54.Bf4 Kg7 55.h5 Kf7 56.Rd8 Ra6 57.Rh8 Kg7 58.Rc8 Kf7 59.Kf2 Bd1 60.Rd8 Ba4
 36/60   02:57    1 830 411k   10 308k   +4,28   31.Qa4 Qe6 32.Kh2 Nb6 33.Qxa5 Nd7 34.Qe1 Rdb8 35.R1c6 Rg8 36.Qd2 Nb8 37.Rc3 Nd7 38.Bb2 Rad8 39.Rc1 Nf6 40.Bxe5 Rxd6 41.Bxd6 Nxe4 42.Qb4 Qxd6 43.Qxe4 Bd3 44.Qa4 Qb6 45.Qxf4 g5 46.Qe5 Qg6 47.Qg3 Bb5 48.Ne5 Qd6 49.f4 Qd2 50.f5 Kh8 51.Nf7+ Kh7 52.Nd6 Ba4
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Subject Author Date/Time
Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Qa4 Vincent Lejeune Fri Nov 24, 2017 1:20 am
      Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Carl Langan Fri Nov 24, 2017 2:04 am
            Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than T. Poppins Fri Nov 24, 2017 5:50 am
                  Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 6:05 am
                        Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than T. Poppins Fri Nov 24, 2017 9:51 am
                              Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 10:50 am
      Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 2:13 am
            Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Vincent Lejeune Fri Nov 24, 2017 2:17 am
                  Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 3:30 am
                        Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Michael B Fri Nov 24, 2017 4:28 am
                        Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Uri Blass Fri Nov 24, 2017 4:44 am
                              Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 5:42 am
                                    Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Mike Libanan Fri Nov 24, 2017 6:48 am
                                          Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Greg Simpson Fri Nov 24, 2017 8:59 am
                                                Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Mike Libanan Fri Nov 24, 2017 12:50 pm
                                          Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Ronald de Man Fri Nov 24, 2017 7:40 pm
                                                Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Mike Libanan Sat Nov 25, 2017 2:35 am
                                    Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 10:40 am
                  Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Eelco de Groot Fri Nov 24, 2017 11:20 am
                  Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Herbert L Fri Nov 24, 2017 7:07 pm
      Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Dann Corbit Fri Nov 24, 2017 4:45 am
      Re: Piket vs Smirin 1993 : CB claims 31.Qxd7 is better than Vincent Lejeune Fri Nov 24, 2017 11:48 am
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