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Zappa (Computer) vs Rybka (Computer)
Clash of the Computer Titans (2007), Mexico City MEX, rd 7, Sep-25
Sicilian Defense: Old Sicilian. Open (B32)  ·  1/2-1/2
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Oct-16-07  shr0pshire: The author of Zappa had to say this about this game:

<<The classic examples are game 7 and game 9. In game 7 Rybka plays Rc7, a terrible move. Why? Because it relies on its search and its search wasn't seeing the correct lines where white gives the pawns on the queen side in exchange for new passed pawns on the kingside, which turn out to be stronger.>>

http://www.hiarcs.net/forums/viewto...

Mar-15-09  WhiteRook48: computer analysis?
Dec-21-15
Premium Chessgames Member
  whiteshark: White missed the winning move <51.hxg7!>


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Dec-21-15
Premium Chessgames Member
  beatgiant: <whiteshark> Could you post your line? It looks like 51. hxg7 <Qe6> is forced, and then what?
Mar-30-18
Premium Chessgames Member
  whiteshark: <beatgiant: Could you post your line? It looks like 51. hxg7 <Qe6> is forced, and then what?>

Now trying varation <50...Qc4 51.hxg7>


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Black to move

1) +6.72 (30 ply) 51...Qe6 52.Qxe6+ Rxe6 53.Re3 d5 54.Kg4 Kxg7 55.Rh1 Re5 56.Kf4 Rh5 57.Rg1 d1=Q 58.Rxd1 Kxg6 59.Rc3 Kf7 60.Rc6 Ke7 61.Rg1 Kd7 62.Ra6 Kc8 63.Rg7 Kb8 64.Rd6 Kc8 65.Rgd7 Rh4+ 66.Kg3 Rh8 67.Rxd5 Re8 68.Kf2 Re6 69.Rh7 e3+ 70.Ke2

2) +5.94 (15 ply) 51...Qc8 52.Qxc8 Rxc8 53.Rd1 Re8 54.Rxd2 Re6 55.Kg4 Rf6 56.Rd4 Kxg7 57.Rxe4 Kxg6 58.Ree3 Rf2 59.Re6+ Kg7 60.Kh4+ Kf7

3) mated-in-4 (15 ply) 51...Kxg7 52.Qd7+ Re7 53.Qxe7+ Qf7 54.gxf7+ Kh6 55.Qh4#

1.0 minute analysis by Stockfish 9 v010218

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