|Jun-27-04|| ||patzer2: Kere's 23. Nxg7! initiates a winning combination illustrating the theme "demolition of pawn structure" via "sacrifice at g7 (g2)."|
Kere's 23. Nxg7! is the answer to problem number 1652 in Chess Informant's "Encyclopedia of Chess Middle Games/Combinations."
Note that if Black plays 23...Kxg7, then White wins with 24. Bh6+! Kg8 (24...Kxh6 25. Rxf7 ; 24...Kg6 25. Qg4#) 25. Qg4+ Kh8 26. Qd4+ Rg7 27. Rg5 Rg8 28. Rc3 Nd8 29. Re3 (threatening 30. Bxg3+ Rxg3 31. Re8+ Qxe8 32. QxR#) 29...Ne6 30. Rxe6 Qxe6 31. Bxg7+ Rxg7 32. Qxg7#.
If Black plays 23...Raf8, then
White wins after 24. Ne6! Rxf5 (24...Qxe6 25. Qg4+! Qg6 26. Rg5 )25. Qg4+! Kh8 26. Nxf8 .
If Black plays 24...Rf7 (24...Re7 and other Rook moves lose to 25. Rf8+ Rxf8 26. Qf8#), then White wins after 25. Rg5+ Kh8 26. Qc3+ Rg7 27. Rxg7 with a decisive White windmill attack (discovered check tactic).
If Black plays 25...Kxg7, then White wins with 26. Qc3+! Kg8 27. Rf3 (threatening 28. Rg3+ Kf8 29. Qh8+ Kf7 30. Qg7+ Ke6 31. Re1+ ), with Black's exposed King and Queen unable to defend against White's actively deployed Queen and Rook.
|Jul-10-05|| ||Eric Xanthus: I was proud to select 23.Nxg7 and its continuation, but I could not see anything more than a won pawn after black's simple 23..Rxf5. Perhaps I am overlooking something simple--it is after midnight here.|
|Jul-10-05|| ||crafty: 23...♖xf5 24. ♘xf5 h5 25. ♕g3+ ♔h7 26. ♕g5 ♕f7 27. ♘e7 (eval 9.75; depth 11 ply; 250M nodes)|
|Jul-10-05|| ||murraygd13: I'm missing it as well.
what's to stop from
25 Rg5+ Kh7
|Jul-10-05|| ||murraygd13: Kh8
I shoulda typed
|Jul-10-05|| ||Boomie: After 24...♖f7 25. ♖g5+ ♔h8 26. ♕c3+ looks mighty tasty.|
|Jul-10-05|| ||jahhaj: <al wazir> 26.♗f6 and White is winning easily.|
|Jul-10-05|| ||al wazir: 25...Bc2 26. Rf4 (26. Rxc2?? Qe1#) Qxg7 27. Rg4 Bg6. Where's the win??|
|Jul-10-05|| ||sfm: <al wazir: 25...♗c2> Smart idea, but white plays 26. ♗f6 and wins quickly, e.g. 26.-,♕e8(or e4) 27.♕g3+ and it is all over.|
|Jul-10-05|| ||fian: How about 24...d5 to prevent white from playing Rc4 later?|
24. Bh6 d5 25. Bxg7 Qxg7 26. h4 h6 and black has just one extra tempo to defend with Rf8.
|Jul-10-05|| ||Snow Man: "Don't kick your opponent, kick through him."
After 22...Rf7 white targets the f8 square.
|Jul-10-05|| ||Eric Xanthus: Thanks for all the lines. In the morning light I can see that, in the 23..Rxf5 line, white has a lot more than the pawn--all his peices are swarming and black's are far away. I did not appreciate how easily and decisively white could invade g4 and h6.|
|Jul-10-05|| ||psmith: <fian> After 24. Bh6 d5 25. h4! white wins, I think.|
|Jul-10-05|| ||arenafootball9: I also looked at nf6+ with similar threats of having the pawn gone, empowering the bishop, and possible queen pins with the second rook. Any lines winning or losing?|
|Jul-10-05|| ||Knight13: What the heck this puzzle doesn't make sense but hard.|
|Jul-10-05|| ||patzer2: <fian> Playing out 24...d5 with Fritz 8 @ 13 depth indicates it's a clear White win:|
24... d5 25. h4! Nd6 (25... Rf7
26. Qg4+ Kh8 27. Qd4+ Rg7 28. Rg5 Rag8 29. Bxg7+ Rxg7 30. Re1 Nd6 31. Re6 Nf5 32. Qe5 Nd6 33. Rxd6 ; 25... Re7 26. Rf8+ Rxf8 27. Qxf8#) 26. Rf4 Nf7 27. Bxg7 Kxg7 28. Rg4+ Kf8 29. Qg3 Nh6 30. Rf4+ Nf7 31. Rc3 Re8 32. Rcf3 a6 33. h5 Re6 34. Rg4 Re1+ 35. Kh2 Bc2 36. Rg8+ Ke7 37. Qh4+ Kd6 38. Rf6+ Kc7 39. Rxf7
Qxf7 40. Qd8+ Kb7 41. Qb8#
Still, 24...d5 is a good idea for putting up strong resistance in a bad position.
|Jul-10-05|| ||patzer2: <...this puzle doesn't make sense...> Like most demolition of combinations, the basic idea of 23. Nxg7! is to sacrifice a piece to strip the King of pawn cover, and then throw everything into an all out attack on the unprotected King.|
However, as the subtlties of this position indicate, the attack must be carefully and accurately conducted.
This position in particular shows the value of the two rooks and the Queen against a King with weak pawn cover and with a piece majority out of play and unable to provide adequate defense.
|Jul-10-05|| ||WhoKeres: This game was from a match won by Keres by a 6-2 score. All eight games in the match began with the Ruy Lopez.|
|Jul-10-05|| ||dac1990: In fact, ALL the games played between Keres and Unzicker were lines of the Ruy Lopez. I wonder why.|
|Jul-11-05|| ||Richard Taylor: 19. ...Bg6 looked better than Ba4|
|Jul-11-05|| ||Richard Taylor: NO -of course he loses the c6 pawn - Black is positionally lost - his knight is badly placed and his two centre pawns are weak in this case|
|Jul-11-05|| ||Richard Taylor: : I solved this one!! It took me ages -I was looking at the line played then went back to Nf6+ The I realised that after 23. N:g7 if K:g7 24. Bh6+ K:h6 25. R:f7 Qe6 26. Rf6+ wins and saw the position WAS a win also 25. ...Qe8 black must win against the king - its mate in a few moves (I didn't see the exact moves but it was obviously won)
Now if 23 Ng7 K:g7 24. Bh6+ Kg8 25. Rg5+ Kh8 26. Qc3+! etc if 24. ... Kh8 25 R:f7 wins and the line Qe6 26.Rf8+ R:f8 27. Q:f8 Qg8 27. Bg7#! is beautiful!! I was pleased to see that as 25 Qc3+ Qe5 isn't so convincing (it wins but isn't so pretty!) |
The problem was 23. ... K:g7 now I thought of 24.Be4 and Bh6 or Rc4 - I rejected Rc4 - having the idea Bc4 was good as I wanted to triple on the f file - but then realised that blocked the B so the B had to go to h6 first! The point!! Then the Rook can ratchett around to partake in the king side attack) and decided on Bh6 (as played) and now I thought Re8 might be played when 25. B:g7 when K:g7 loses to 25. Qg4+ Kh8 26. Rf8+ (I was desperately wanting that move!!) R:f8 27. Q:d7 when I could see that even the c pawn was pinned and white attacks the knight on b7 and there was no mate on the back rank etc)
This all "visualised" ... but I thought (even earlier) that after R:f7 there was no progress but I thought if h4 creates a luft and also the rook threatens to pin the Queen so my line was now 23. N:g7 Rg7 24.Bh6 Re8 25.h4 (creates "luft" and threatens and 26.Rg5 and Rc4 is on also)then h6 27. Rc4 Re1+ 28. Kh2 and white is going to get the black Queen and has the attack as well. Also saw that 27. ...Qa1+ was no good...
The other move to analyse was 23. N:g7 R:f5 24. N:f5 d5 (say) 25. Qg3+ Kf8 26 Bh6+ Ke8 27 Re1+ Kd8 28. Bg5+ Kc8 29. Ne2+ and if Ke8 30. Nc6# but I didnt see all of this line - I saw that after 24. N:f5 white was winning...
And d5 and c5 are moves by Black to be considered
I haven't looked at Patzer's analysis yet...but I feel I solved this one but it took me about 60 minutes of analysis to come up with it - the trouble is in these positions one has ot analyse all sorts of possibilities - and I started in on 23 Nf6+ g:f6 24. Bd4 -now Keres possibly saw fairly quickly that that doesn't win...
Patzer is right of course one always looks at ways to remove the defence from the (opposing) King I would have played somethng like this OTB even without a complete analysis -it looks winning - given I had sufficent time
However I didn't look at ..Qe7 but White in that case has an easier win I think.
|Jul-12-05|| ||Benzol: <Richard> Glad you solved it. Well done! I totally missed it.|
|Jul-13-05|| ||Richard Taylor: <benzol> thanks - I miss as many as I get -lol -thought wouldn't crack this one though at first.|
|Apr-13-17|| ||southeuro: The tactical Ng7's equally beautiful positional counterpart is the move b4.|