|Dec-11-10|| ||engineerX: This is a wonderful combination and should be in GM Leitao's notable games.|
|May-05-15|| ||whiteshark: <engineerX: This is a wonderful combination and should be in GM Leitao's notable games.> Absolutely!!|
GM Rafael Leitão video-annotated his brilliancy here: http://www.youtube.com/watch?v=KMab... Enjoy!
|Mar-17-16|| ||Penguincw: Happy St. Patrick's Day. Hoping I can get lucky today.|
Looked at the game, a lot of possible moves. There's 23.Bg3, with hopes of 23...Qxg3 24.e5+. There's also 23.Rxf6+, hoping black plays 23...Qxf6, which would drop the queen.
I ended up going with the latter, and followed with 24.Bxg5+ in hopes of 24...Kxg5, which isn't forced or anything.
|Mar-17-16|| ||al wazir: My move was 23. Bg3. I'm pretty sure it wins after the discovered check in all variations. Here's one: 23...Qxg3 24. e5+ Kg7 25. exf6+ Kh8 26. f7 Rf8 27. e7.|
|Mar-17-16|| ||King Sacrificer: <al wazir: My move was 23. Bg3. I'm pretty sure it wins after the discovered check in all variations. Here's one: 23...Qxg3 24. e5+ Kg7 25. exf6+ Kh8 26. f7 Rf8 27. e7>|
What about <23. Bg3 Qxe4> ?
I was stuck after many attempts to make <23. Rxf6 Kxf6 24. Rf1+> work. I never thought of moving the queen, let alone the e8 rook's defensive vulnarability.
|Mar-17-16|| ||An Englishman: Good Evening: Solved it, but how impressive is that 18th move? A Sunday 18. White to Move would probably prove unsolvable.|
|Mar-17-16|| ||WDenayer: I don't get it. Why not 25.Qf7+ and it's mate in a couple of moves - Nf5 coming?|
|Mar-17-16|| ||diagonalley: well... 23.RxB+ was the clear prime candidate to press home the attack, but i didn't find the exquisite follow-up 24.Q-B2+ ... lovely puzzle|
|Mar-17-16|| ||Once: <WDenayer:I don't get it. Why not 25.Qf7+ and it's mate in a couple of moves - Nf5 coming?>|
I wondered the same thing. Fritzie says that 25. Qf7+ also wins, but we do have to see that a later Rxb7 is also needed. The point is that after 25. Qf7+ Kh8, we get to here:
click for larger view
Black is hanging on grimly. We need to find a way of continuing the attack. By far the best continuation from here is 26. Rxb7 setting up threats of Qxh7#.
Having seen that, white decided to play 25. Rxb7+ first as he gets to play it with check. But frankly there is not much to choose between 25. Rxb7+ or 25. Qf7+. Fritzie rates them as +9.96 and +9.4 respectively.
|Mar-17-16|| ||gofer: Today's POTD is quite easy. The first three moves play themselves.|
<23 Rxf6+ ...>
23 ... Qxf6
<23 ... Kxf6>
<24 Qf2+ ...>
24 ... Qf4
24 ... Kd7
25 Qf7+ Kd6 ( Kd8 26 Nxc6+ bxc6 (Nxc6 27 Qd7#) 27 Rxb8+ Rxb8/Qxb8 28 Qd7# )
26 Bg3! Qxg3
24 ... Kg6
25 Qf7+ Kh6
<24 ... Kg7>
<25 Qf7+ ...>
25 ... Kh6
<25 ... Kh8>
<26 Rxb7! ...>
click for larger view
White forces black to make a decision, because Qxh7# is threatened and if the
queen moves off the a1-h8 diagonal then Qg7# is threatened. So black must choose
between blocking the 7th rank with its knight and taking the rook and taking the
rook is not a good idea...
26 ... Bxb7
27 Qxe8+ Kg7
28 Qf7+ Kh6
<26 ... Nd7!>
<27 exd7 ...>
27 ... Rf8
28 d8=Q mating
27 ... Bxd7
28 Rxd7 mating
<27 ... Bxb7>
<28 dxe8=Q+ Rxe8> (Qxe8 30 Qf6+ Kg8 31 Nf5! )
<29 Bxg5! Qxg5>
<30 Qxe8+ Qg8> (Kg7 Ne6+ )
<31 Qe5+ Qg7>
<32 Qb8+ Qg8>
Doh! I made a meal out of that! White's play was far more elegant, but I think black had to play <25 ... Nd7!> at which point I think everything transposes...
click for larger view
|Mar-17-16|| ||agb2002: White has two pawns for a bishop.
Black threatens 23... gxh4 and 23... B(Q)xe4.
The first idea that comes to mind is 24.Rxf6+:
A) 24... Kxf6 25.Qf2+
A.1) 25... Ke7 26.Qf7+
A.1.a) 26... Kd8 27.Nxc6+ bxc6 (27... Nxc6 28.Qd7#; 27... Kc8 28.Qxb7#) 28.Rxb8+ Q(R)xb8 29.Qd7#.
A.1.b) 26... Kd6 27.Bg3 Qxg3 28.Nf5+ and 29.Nxg3 + - [Q+2P vs R+B] and an overwhelming position.
A.2) 25... Kg6 26.Qf7+ Kh6 27.Nf5+ Qxf5 28.exf5 gxh4 (due to the threat 29.Qf6+ Kh5 30.Qxg5#) 29.Rb4 and mate soon.
A.3) 25... Kg7 26.Qf7+ Kh8 (26... Kh6 transposes to A.2) 27.
A.4) 25... Qf4 26.Qxf4+ wins.
B) 24... Qxf6 25.e5+ Kh6 (25... Kg7 26.exf6+ Kxf6 27.Rf1+ followed by 28.Bxg5 + - [Q+2P vs R]) 26.exf6 gxh4 27.f7 (or 27.Nxc6 Nxc6 28.Rxb7) + - [Q+2P vs R+B].
C) 24... Kg7 25.Rf5
C.1) 25... Qxe4 26.Rxg5+
C.1.a) 26... Kh6 27.Nf5+ Qxf5 28.Qxf5 wins.
C.1.b) 26... Kf6 27.Rg4+ wins.
C.1.c) 26... Kf8 27.Qf2+ Ke7 28.Rg4+ wins.
C.1.d) 26... Kh8 27.Rg4 Qe5 (27... Qxc2 28.Bf6#) 28.Re1 wins.
C.2) 25... Bxe4 26.Rxe5 Bxc2 27.Nxc2 + - [2B+2P vs N].
C.3) 25... Qd6 26.Rxg4+ + - [3P].
D) 24... Kh5 25.Qe2+ and 26.Qg4#.
|Mar-17-16|| ||agb2002: For some reason I got distracted or forgot to complete my line A.3 (27.Rxb7 etc.).|
|Mar-17-16|| ||Lambda: 23. Rxf6+ Kxf6 (if black can't take, it was clearly a good idea, if queen takes, e5+ wins the queen) 24. Qf2+ and...|
1) 24... Kg6/g7 25. Qf7+ Kh6 26. Nf5+ Qxf5 27. exf5 gxh4 28. Qf6+ Kh5 29. Rb4
2) 24... Ke7 25. Qf7+ Kd8 (25... Kd6 26. Bg3 Qxg3 27. Nf5+) 26. Nxc6+ Nxc6 27. Rd1+ Kc8 28. Qxe8+ and if nothing better, 29. Qe7+ and 30. Qxg5
3) 24... Kg7 25. Qf7+ Kh8 26. Rxb7 Nd7 (26... Bxb7 27. Qxe8+ Kg7 28. Qf7+ Kh6 [28... Kh8 29. Qf8#] 29. Nf5+ Qxf5 30. exf5 and if 30... gxh4 just 31. Qxb7 is enough) 27. exd7 Bxb7 28. dxe8=Q/R+ Qxe8 (28... Rxe8 29. Bxg5) 29. Qf6+ Kg8 30. Nf5 with twin threats of Qg7# and Nh6# wins
That's certainly enough to gain winning positions in all lines, anyway. There are probably improvements, since we're attacking the king so much.
|Mar-17-16|| ||morfishine: <23.Rxf6+> is an internal explosion that causes a fatal implosion of Black's position, one move and one piece at a time|
|Mar-17-16|| ||PawnSac: < whiteshark: <engineerX: This is a wonderful combination and should be in GM Leitao's notable games.> Absolutely!!
GM Rafael Leitão video-annotated his brilliancy here: http://www.youtube.com/watch?v=KMab... Enjoy! >|
Good find on that video whiteshark. He does a decent job covering the important theoretical aspects of this interesting line.
|Mar-17-16|| ||patzer2: Lately it looks like Thursday is the new Sunday for me when it comes to solving chessgames.com puzzles.|
My failed try for today's puzzle was 23. Nxc6? which favors Black after 23...Nxc6 24. Rf5 Qxe6
[also good for black here is 24... Qxc3 25. Rxg5+ (not 25. Rxf6+?? Qxf6 26. e5+ Qf5 ) 25... Kh6 26. Qxc3 Bxc3 27. Rxb7 Rab8 28. Rxb8 Nxb8 29. g4 Nc6 (-1.31 @ 24 depth, Deep Fritz 15)]
25. Rbf1 Bd8 26. e5 Kg7 27. Bxg5 Nxe5 28. Be3 Bb6 29. Bd4 Kg8 30. Kh1
Bxd4 31. cxd4 Ng6 32. d5 Qd7 to (-1.73 @ 18 depth, Deep Fritz 15).
Correct is the game continuation with the winning exchange sacrifice <23. ♖xf6+!> (+12.13 @ 36 depth, Stockfish 5 SE)
Not 23... Qxf6?? 24. e5+ (#10, Deep Fritz 15 @ 21 depth).
<24. ♕f2+ ♔g7>
If 24... Ke7, then White wins after 25. Nxc6+ bxc6 26. Qf7+ Kd6 (26... Kd8 27. Rxb8+ Rxb8 28. Qd7#) 27. Qxe8 gxh4 28. Qf8+ Kxe6 29. Qe8+ Kd6 (29... Kf6 30. Rf1+ Qf4 31. Rxf4+ Kg5 32. Rf5+ Kh6 33. Qf8+ Kg6 34. Qf6#) 30. Rd1+ Qd5 31. exd5 (#7 Deep Fritz 15 @ 27 depth)
If 24... Kg6, then White mates following 25. Qf7+ Kh6 26. Nf5+ Qxf5 27. Qxf5 gxh4 28. Qf6+ Kh5 29. Rf1 Bxe4 30. Rf4 a5 31. Rxh4#
Just as good, and perhaps easier for those who are not experts or masters, is <WDenayer> suggestion 25. Qf7+! Kh8 when play might continue 26. Rxb7! Nd7 (26... Bxb7 27. Qxe8+ ) 27. exd7 Bxd7 28. Rxd7 Re7 29. Rxe7 Qxe7 30. Qxe7 Rb8 31. Nf5 Rb1+ 32. Kh2 Rh1+
33. Kxh1 gxh4 34. Qg7#.
<25... ♔h8 26. ♗g3 1-0>
Black resigns in lieu of the dual mate threats 26... Qxe4 27. Qf6+ Kg8 28. Qg7# and 26... Bxb7 27. Bxe5+ Kg8 28. Qf7#.
P.S.: So where did Black go wrong? According to the computer, Black's clearly decisive mistake was <17... ♗f6?> allowing 18. Bxf7+! Kxf7 19. Qb3+ (+2.83 @ 32 depth, Stockfish 5SE).
Instead, 17...Bxf4 18. Qf2 (+1.22 @ 21 depth, Deep Fritz 15) puts up more resistance to keep Black in the fight longer.
One move before, instead of <16...♖e8?> which allowed 17. f4 to (+2.16 @ 28 depth, Komodo 9.2), Black could have kept it about level with 16...a6 17. Rfd1 Re8 = (0.03 @ 22 depth, Deep Rybka 3 x 64) or 16...e6 17. Rfd1 b6 = (0.22 @ 21 depth, Deep Fritz 15).
|Mar-17-16|| ||saturn2: Blacks queen side is underdeveloped, its king is developed well, so white develops the opponents king further: 23 RxB KxR (forced, otherwise loss of queen) and now decisive attack on the f-file.|
|Mar-17-16|| ||transpose: I seem to be slow this week. I got Rxf6 but did not see the followup Qf2+. For some reason I only saw the followup as Nf3 or Rf1+, and spent too much time trying to work these out.|
|Mar-17-16|| ||kevin86: It looks like the attack coming will be unable to stop.|
|Mar-17-16|| ||al wazir: <King Sacrificer: What about <23. Bg3 Qxe4?> Then white still has Rxf6+, etc.|
|Mar-17-16|| ||Tiggler: <al wazir: My move was 23. Bg3. I'm pretty sure it wins after the discovered check in all variations. Here's one: 23...Qxg3 24. e5+ Kg7 25. exf6+ Kh8 26. f7 Rf8 27. e7.>|
That was my move too. Looked so tasty that I did not look any further.
|Mar-17-16|| ||morfishine: Nice work <everybody> on <23.Bg3> Same theme earlier, same result, very nice|
|Mar-17-16|| ||stst: Many ways, the obvious being RxB+, others include Bg3 (inviting QxB, e5 dis+ etc) or even Nf3 forcing the Black Q to move, then e5 dis+ etc.
In all cases, once checking starts, Black's K may flee for several moves, but not long...|
|Mar-18-16|| ||CHESSTTCAMPS: White has two pawns for a piece, including an e6 passer that supports a king-side attack. The undeveloped queen-side pieces underscore the black disadvantage. First, I wanted to play 23.Rf5 to separate the BQ from the defense of Bf6, but could not find a clear win after 23... Qxe4 24.Rxf6+ Kxf6 25.Qf2+ Ke7. Next I tried to simplify the solution with an immediate 23.Rxf6+ Kxf6 24.Qf2+ but there was no clear-cut win there either. The best I can find is |
23.Bg3! and now:
A.23... Qxg3? 24.e5+ Kh6/g7 (Kh5 25.Qh7#) 25.Nf5+ wins the queen.
B.23... Qxe4 24.Rf6+ Kxf6 25.Qf2+ Kg7 (Ke7 26.Qf7+ Kd8 27.Qc7#) 26.Rxb7+! Nd7?! (26... Bxb7? 27.Qf7+ Kh8 28.Qxe8+ Kg7 29.Qf7+ Kh6 30.Nf5+ wins queen) 27.Qf7+ Kh8 28.Nxc6 looks to be winning.
All I have time for....
|Mar-18-16|| ||CHESSTTCAMPS: I had the right ideas, but imprecise calculation. You can try playing the puzzle position against Crafty using the following link:|