Tuesday, January 24, 2017

[zghmwfxn] Carlsen - Karjakin final mating combination

We analyze the variations after 49.Rc8+ all the way to checkmate.  Moves that are the only moves which preserve the win are marked with a single exclamation point.  If there are multiple winning moves tied with the same shortest distance to checkmate, then all are given (which is unconventional for analysis).  We also give all black defenses, even if they get checkmated quicker.  The two variations with 54.Qd5+ cause checkmate 1 move slower so are marked with a question mark.

[Event "Carlsen - Karjakin World Championship"]
[Date "2016.11.30"]
[Round "13.4"]
[White "Magnus Carlsen"]
[Black "Sergey Karjakin"]
[Result "1-0"]
[ECO "B54"]
[EventDate "2016.11.30"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6.Nb3 Be7 7.c4 a5 8.Be3 a4 9.Nc1 O-O 10.Nc3 Qa5 11.Qd2 Na6 12.Be2 Nc5 13.O-O Bd7 14.Rb1 Rfc8 15.b4 axb3 16.axb3 Qd8 17.Nd3 Ne6 18.Nb4 Bc6 19.Rfd1 h5 20.Bf1 h4 21.Qf2 Nd7 22.g3 Ra3 23.Bh3 Rca8 24.Nc2 R3a6 25.Nb4 Ra5 26.Nc2 b6 27.Rd2 Qc7 28.Rbd1 Bf8 29.gxh4 Nf4 30.Bxf4 exf4 31.Bxd7 Qxd7 32.Nb4 Ra3 33.Nxc6 Qxc6 34.Nb5 Rxb3 35.Nd4 Qxc4 36.Nxb3 Qxb3 37.Qe2 Be7 38.Kg2 Qe6 39.h5 Ra3 40.Rd3 Ra2 41.R3d2 Ra3 42.Rd3 Ra7 43.Rd5 Rc7 44.Qd2 Qf6 45.Rf5 Qh4 46.Rc1 Ra7 47.Qxf4 Ra2+ 48.Kh1 Qf2? {allows the mating attack} 49.Rc8+!! {not the only move that wins, but the fastest and of course prettiest} Kh7 ( 49...Bd8 50.Rxd8+! Kh7 51.Qh6+! Kxh6 ( 51...gxh6 52.Rxf7#! ) 52.Rh8#! ) ( 49...Bf8 50.Rxf8+! Kxf8 ( 50...Kh7 51.Qh6+! Kxh6 ( 51...gxh6 52.R5xf7# ) 52.Rh8#! ) 51.Rxf7+! Ke8 ( 51...Kg8 52.Rf8+! Kh7 53.Qf5+! Kh6 ( 53...g6 54.Qxg6# ) 54.Rh8# ( 54.Qg6# ) ) 52.Rf8+! Kd7 ( 52...Ke7 53.Qf7# ) 53.Qf5+ ( 53.Qf7+ Kc6 54.Rc8+ ( 54.Qd5+? Kc7 ( 54...Kd7 55.Qb7+ ( 55.Rf7+ Kc8 ( 55...Kd8 56.Qxd6+ Ke8 ( 56...Kc8 57.Qc7# ( 57.Qf8# ) ) ) ( 55...Ke8 56.Qe6+! Kd8 57.Qd7# ) 56.Qb7+ ( 56.Qc6+ Kb8 ( 56...Kd8 57.Qd7# ) 57.Qb7# ( 57.Qe8# ) ) ( 56.Qe6+ Kb8 ( 56...Kd8 57.Qd7# ) 57.Qe8# ) 56...Kd8 57.Rf8# ( 57.Qd7# ) ( 57.Qb8# ) ) ( 55.Qb5+ Kc7 ( 55...Ke7 ( 55...Ke6 56.Qe8# ) 56.Qe8# ) 56.Rf7+ Kb8 ( 56...Kc8 ( 56...Kd8 57.Qd7# ) 57.Qe8# ) 57.Qe8# ) 55...Ke6 56.Re8+ ( 56.Qf7+ Ke5 57.Qd5# ) 56...Kf6 57.Qe7# ) 55.Rf7+ Kd8 ( 55...Kb8 56.Qb7# ) ( 55...Kc8 56.Qb7+ Kd8 57.Rf8# ( 57.Qd7# ) ( 57.Qb8# ) ) 56.Qxd6+ Ke8 ( 56...Kc8 57.Qc7# ( 57.Qf8# ) ) 57.Rf8# ( 57.Qd7# ) ( 57.Qe7# ) ) 54...Kb5 55.Qc4+ Ka5 56.Ra8# {Longest defense} ) 53...Kc6 ( 53...Ke7 54.Qf7# ) ( 53...Kc7 54.Qc8# ) 54.Rc8+ ( 54.Qd5+? Kc7 ( 54...Kd7 55.Rf7+ ( 55.Qb7+ Ke6 56.Re8+ ( 56.Qf7+ Ke5 57.Qd5# ) 56...Kf6 57.Qe7# ) ( 55.Qb5+ Kc7 ( 55...Ke6 56.Qe8# ) ( 55...Ke7 56.Qe8# ) 56.Rf7+ Kd8 ( 56...Kb8 57.Qe8# ) ( 56...Kc8 57.Qe8# ) 57.Qd7# ) 55...Kc8 ( 55...Kd8 56.Qxd6+ Kc8 ( 56...Ke8 57.Rf8# ( 57.Qd7# ) ( 57.Qe7# ) ( 57.Qf8# ) ) 57.Qc7# ( 57.Qf8# ) ) ( 55...Ke8 56.Qe6+! Kd8 57.Qd7# ) 56.Qc6+ ( 56.Qe6+ Kd8 ( 56...Kb8 57.Qe8# ) 57.Qd7# ) ( 56.Qb7+ Kd8 57.Rf8# ( 57.Qd7# ) ( 57.Qb8# ) ) 56...Kb8 ( 56...Kd8 57.Qd7# ) 57.Qb7# ( 57.Qe8# ) ) 55.Rf7+ Kc8 ( 55...Kd8 56.Qxd6+ Ke8 ( 56...Kc8 57.Qc7# ( 57.Qf8# ) ) 57.Qe7# ( 57.Rf8# ) ( 57.Qd7# ) ( 57.Qf8# ) ) ( 55...Kb8 56.Qb7# ) 56.Qc6+ Kd8 57.Qd7# ) 54...Kb7 55.Qd7+! Ka6 56.Ra8#! {Longest defense} ) 50.Qh6+! ( 50.Qh6+ Kxh6 ( 50...gxh6 51.Rxf7#! ) 51.Rh8#! ) 1-0

It surprised me that Carlsen worked out that 49...Bf8 is mate, even though it is quite long.  In the Longest defense variations, the black king gets chased all the way to the A file.  However, the variations with 54.Qd5? have that as a more natural move, boxing in the black king, and many end with a more natural back rank mate.

Also a bit surprising that Karjakin did not play 49...Bf8.

Create a tool to produce analyses like this, with a UI to navigate variations including doing something efficient with transpositions.

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