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Apr-10-09 WhiteRook48 : not surprised to miss a Friday

Apr-10-09 PinnedPiece : Alternative black defense, loses knight (all forced moves): 24.e5 Bxc3 25.exd6 Qxd6 26.Rd5 Re1 27.Qxh7+ Kf8 28.Qh8+ Ke7 29.Qh4+ Qf6 30.Rxe1+ Bxe1 31.Qxe1+ Kf8 32.Qxb4+ Kg8

click for larger view

Apr-10-09

Arbiter58 : 24 e5 I found too, and the nice continuation after 24.. Bxc3 25exd6 Qxd6 26Rd5 I saw as well. Where I had difficulties is 24..Nxd3. It eliminates the nasty bishop and with it the threats at h7. However, I found this: 25 Nd5 Qd8 (25..Qd7 is bad because of 26 Qg3! with the threat of Nf6 as well as exd6) 26 Nxe7+ Qxe7 (if 26 Rxe7 then the devastating 26..Rxf7!) 27 Qxe7 Rxe7

28 exd6 Rd7 and

29 Rd1

after 29.. Nxf2 30 Rxf2 Bxa5 31 Re2 white should have a winning game with the exchange up and a nice pawn at d6. Any further thoughts on this?

Apr-10-09

agb2002 : Black threatens 24... Nxd3 25.cxd3 Bxc3 26.bxc3 Qxc3, however his knight is hanging, if we remove the pawn on e4 and the rook on f5 then White would deliver mate in two with Qxh7+ and the black queen and the rook on e7 look suggest the possibility of a fork with the knight (Nd5) or with the pawn on e4 (e5-exd6). Hence, 24.e5: A) 24... Nxd3 25.Nd5 Q moves 26.Nxe7+ followed by 27.cxd3 + -. B) 24... Bxc3 25.exd6

B.1) 25... Bf6 26.Rxf6 + -.

B.2) 25... Be1 26.Qxe7 Qxe7 (26... Rxe7 27.dxc7 Rxc7 28.Rxe1) 27.dxe7 + -. B.3) 25... Qxd6 26.Rf6

B.3.a) 26... Re6(4) 27.Qxh7+ Kf8 28.Rxf7#.

B.3.b) 26... Qxd3 27.cxd3 Bxf6 28.Qxb4 + -.

B.3.c) 26... Nxd3 27.Rxd6 Re1 with some complications, so the other rook move might be preferable. B.4) 25... Qxd6 26.Rd5

B.4.a) 26... N(Q)xd5 27.Qh7+ Kf8 28.Qh8#.

B.4.b) 26... Qh6 27.Qxe7 Qe6 (27... Rxe7 28.Rd8+; 27... Rf8 28.Rd8 g6 29.Qxf7+ Kh8 30.Rxf8+ Qxf8 31.Qxf8#) 28.Qxe6 fxe6 29.Rd7 + -. B.4.c) 26... Qg6 27.Bxg6 f(h)xg6 28.Rd8 Bf6 29.Rxe8+ + -. B.4.d) 26... Re4 27.Qxh7+ Kf8 28.Rxd6 + -.

C) 24... Qc5 25.e6 Qc7 (25... d5 26.exf7+) 26.Qxb4 + -. D) 24... Qxa5 25.exd6 Re5 26.Rxe5 Rxe5 27.Qxh7+ Kf8 28.Qh8#. Let's see.

Apr-10-09 CHESSTTCAMPS : Material is even, but white clearly has a strong initiative, with pressure on the lightly defended castled black king position, particularly h7. Black is attempting to neutralize that pressure by exchanging off white's minor pieces. But does white need his minors to execute a powerful attack? Immediately I like the move e5, for four reasons: (1) It is forcing because it attacks the Nb4; (2) it opens the b1-h7 diagonal; (3) it opens e4 for the knight and (4) the pawn could join the attack. So, 24.e5 with the following defenses to consider:

A. 24... Nxd3 25.Nd5 Qd7 26.Nxe7+ (26.Nf6+ gxf6 27.exf6 Ne5 seems to hold) Rxe7 27.exd6 Qxd6 28.cxd3 (not Rd5 Nf2+) and white's exchange should prevail. B. 24.... Rxe5 25.Qxb4 is a safe extra piece.

C. 24.... dxe5 25.Qxb4 e4 26.Bc4 e3 27.Rxf7 Rxf7 28.Rxf7 Qxf7 29.Bxf7+ Kxf7 30.Qxb7+ Re7 31.Qd5+ Kf8 32.Ne2 Rf7 33.Kg1 Rf2 34.Qf4 wins the a-pawn and keeps black's e-pawn reined in, so the queen for the rook wins easily. D. 24.... Bxc3 25.exd6! Qxd6 26.Rd5! Qh6 (else 27.Qxh7+) 27.Qxe7! Qe6 28.Qxe6 fxe6 29.Rd7 Bxb2 30.Rxb7 Bc3 31.Ra7 Nxd3 32.cxd3 Bxa5 33.Rxa6 and white's extra exchange whould win here too. D.1 26....Nxd3 27.Rxd6 wins the queen and another piece. E. 24.... g6 25.Ne4 (The threat of Nf6+ is decisive) h5 26.Nf6+ Kf8 (Kg7 27.Nxe8+ Rxe8 28.Rxf7+) 27.Rxh5 gxh5 28.Qxh5 Re6 29.Qa8+ and mate next. There may be sharper options in here, but it's time to check it out.

Apr-10-09

agb2002 : The puzzle position reminded me of Fischer vs Benko, 1963. That made my task much easier with the exception of the move Rf6 (line B.3, the influence of that game!) which I had to reconsider.

Apr-10-09 Mulyahnto : 24. e5 Nxd3 pretty much forces:

25. Nd5 Qd8 26. Nxe7+ Qxe7 27. Qxe7 Rxe7 28. exd6 d7 29. cxd3 f6. And white is up by a pawn and the exchange.

click for larger view 24. e5 Bxc3 25. exd6 and black may continue:

25. ... Be1!? 26. Qd4 Nc6 27. Qf4 Bd2 28. Qg3 Be1 29. Qf3 Qxd6 30. Rxf7 g6 31. Bc4 Kh8 (pretty much all forced by black) and white has a devastating attack

click for larger view 24. e5 g6 is cleverly answered with:

25. Ne4! gxf5? 26. Nf6+ Kf8 27. Nxh7+ Kg7 28. Qf6+ Kg8 29. Rf3 White forces mate!

click for larger view but if 24. e5 g6 25. Ne4! Rxe5 then

26. Nf6+ Kf8 27. Rxe5 dxe5 28. Qxh7 Bf4 29. Bxg6 and there is no way black can save his rook.

click for larger view if 24. e5 dxe5 then simply 25. Qxb4 and white goes up a minor piece for a pawn.

Apr-10-09

kevin86 : A brilliantfinish-well beyond my puny mind's ability to cogitate it.

Apr-10-09

neilmcmurdo : The best play lines after 24 ... nxd3 are complex. However, OTB whilst considering white's 24th move, I think it's enough to show that winning the exchange is good enough to secure a decent advantage for white. That there are stronger continuations after move 26 (e.g. knight sacs on f6) is a bonus, and one the attacking player might be able to spot once you get to that point.

Apr-10-09 TheChessGuy : Pushing a pawn in the center initiates a kingside attack! Always play over the entire board, it gives you so many variations to work with.

Apr-10-09 penguin496 : It seems to me that in the last two puzzles the first move was clear from pure positional considerations. Here moving the pawn to open the line for the bishop and yesterday sacrificing the exchange so the bishop can take the pawn on f7.

Apr-10-09 YouRang : Happily (considering how poorly I've been doing lately), I noticed the tactical benefits of 24.e5 pretty quickly: [1] threatens QxNb4, [2] opens diagonal for LSB to support Qh7+ & Qh8#, [3] threatens exd6. Black can save their N and take our LSB with 24...NxBd3, but then comes Nd5 forking Q+R, followed by NxRe7+ and cxNd3. Or, black can guard their N and take ours with 24...Bxc3, but then we exploit the LSB mate with 25.exd6 Qxd6 26.Rd5 (guards our LSB with double-threat: RxQ and Qxh7+). I expected 26...Qh6 with 27.Qxd7 Qe6 (27...Rxd7? 28.Rd8+ ~#), and after trade-offs, white wins the exchange.

Apr-10-09

whiteshark : Got <24.e5!> with <24...Nxd3 25.Nd5 Qd8 26.Nxe7+ Qxe7> (26...Rxe7 27.Rxf7! ) <27.Qxe7 Rxe7 28.exd6 >

Apr-10-09

gawain : Good puzzle. I had some of the pieces of the solution but did not put them together. I saw the mating threat via an eventual Qxh7 once the Bishop gained control of the diagonal. It did not look to me as if W had time to exploit this as TWO pieces had to move to clear the diagonal. But I saw that White could in some variations get a free move for his rook to attack the Black Queen by dis-covering the Bishop's attack on h7. But I did not think e5 was forcing enough. I did not see that moving the pawn discovers an attack by the White Queen on the b4 knight. I considered starting with 24 e5 but did not think it through--and I assumed that Black would simply take the c3 bishop with his knight. I had earlier seen (but then forgot) that if the Black N vacates b4 then Nd5 will fork the black Q and R I like it that White wins without ever having to carry out the qxhh7 threat!

Apr-10-09

Sneaky : <PinnedPiece: 24. e5 Nxd3 leaves 25.Nd5 for white.> I think that is what this puzzle is REALLY about. Some people say "24.e5 is obvious", and of course it is, because it makes that bishop come alive. In a bullet game I would play 24.e5 without thought. But when you have time to contemplate, you look at it and think "Black can just chop wood NxB so where's the teeth to e5?" The teeth are in that Nd5! intermezzo, which gets really slippery to calculate (at least for me) because there are so many pieces on the pot. Once you can safely rule out NxB is a plausible reply to 24.e5! it quickly becomes clear that it's a crusher.

Apr-10-09 ruzon : I tried writing down what I saw this time:

24.♕xf7+ ♔xf7 (24...♔f8 25.♕h8#) 25. ♖h5+ ♔g8/♔g6

24.♕xe7 ♖xe7

24.e5 ♖xe5? 25.♕xh7+ ♔xh7? 26.♖xe5+ g6 27.♖xe8

24.e5 dxe5 25.♕xh7+ ♔xh7 26.♖xf7+ ♔g8

24.e5 g6 25.exd6 ♕xd6 ♖f6 ♕c7=

I really wanted to sac my queen, so much so that I never noticed I was attacking the knight at b4. And I never considered 24...♗xc3 or ♘xd3.

Apr-10-09 newzild : I missed it today, but I did think of a good pun if this was GOTD: "Oral sucks!"

Apr-10-09 SpoiltVictorianChild : Saw the first move, and had the general idea, though I'm sure I wouldn't have played this well OTB.

Apr-10-09 TheBish : Nisipeanu vs Oral, 2004 White to play (24.?) "Difficult" (3 stars)

Material is even. Positional considerations: White has a possible knight fork on d5 if Black's knight moves (Nxd3), and latent threats on h7 that will manifest if both the e5 pawn and f5 rook are cleared. In addition, both Black's knight and bishop are undefended, which often are conditions present in tactical solutions. Candidate moves: Nd5, e5.

24. Nd5 Nxd5 25. exd5 succeeds in opening the diagonal leading to h7 for White's bishop, but it also opens the e-file for Black's doubled rooks, and after 25...h6 or 25...g6, there is no follow-up and Black stands well, at least equal. 24. e5! simultaneously attacks the knight on b4, as well as partially clearing the d3-h7 diagonal for the bishop. White threatens both 25. Qxb4 as well as 25. exd6 Qxd6 26. Rf6! gxf6 27. Qxh7+ Kf8 28. Qf8 mate. Now: A) 24...Qxa5? 25. e6! (even stronger than 25. exd6 Re5) wins with dual threats on the queen and pawn fork (exf7+). B) 24...Nxd3 25. Nd5 wins at least the exchange, but actually much more. After 25...Qd7 (or Qd8) 26. Nf6+! gxf6 (forced, since 26...Kf8 27. Nxh7+ Kg8 28. Nf6+ forces it anyway) 27. exf6 threatens 28. Qg4+ and a quick mate. After 27...Kh8 28. Rh5 h6 29. Rxh6+ Bxh6 30. Qxh6+ Kg8 31. Qg7 mate, or 27...Kf8 28. Qg4 Rc8 29. Qg7+ Ke8 30. Qg8 mate. Any other move by Black's queen (after 25. Nd5) allows 26. Nxe7+ Rxe7 (or 26...Kf8 27. Rxf7# or 26...Kh8 27. Qxh7+! Kxh7 28. Rh5# or win of Black's queen if 25...Qc5 or 25...Qc4) 27. Qxe7 and a quick crush. C) 24...Bxc3 (removing the pesky knight, but leaving the pesky bishop!) allows 25. exd6 and now Black faces a dilemma: C1) 25...Qxd6 26. Rf6! wins the queen, since mate in two starting with Qxh7+ is threatened. C2) 25...Qd7 26. dxe7 Nxd3 (or 26...Bxb2 27. Qxh7+!! Kxh7 28. Rh5+ Kg8 29. Bh7+ Kh8 30. Bg6+ Kg8 31. Bxf7 mate, or 26...Bd2 27. Rxf7 with dual threats of Rf8+ and Qxh7#, or 26...Bf6 27. Rxf6 Nxd3 28. Rxf7) 27. Rxf7 h6 (or 27...Bf6 28. R1xf6) 28. Rf8+ Kh7 29. Qf5+ g6 30. Rf7+ Kh8 31. Qxg6 and mate in two after the spite check (Nf2+). I think that's about it... time to check!

Apr-10-09 TheBish : Rats, I missed it by a whisker, since I had 26. Rf6 instead of 26. Rd5!, although 26. Rf6 Qxd3 27. cxd3 Bxf6 28. Qxb4 should still win in the long run, but not the quick crush as in the game. So I guess I get an A- instead of an A. As I often do, once I got the winning position I rushed the finale, but as I often say, in an OTB situation, I would probably find the better move if I had the time!

Apr-10-09 crwynn : <Gilmoy: <SamAtoms1980: However, after 24 ... Bxc3 25 exd6 Qxd6, I had not 26 Rd5, but 26 Rf6> <DoubleCheck: I did not see the impressive Rf6!> 26.Rf6?? Re6 and Black's K has a flight square through e7. 27.Rxf7 Rh6 and now it's White who's getting mated at h2, so he must give his Q. Oops.> I believe the "oops" is yours, 26.Rf6 was my solution as well, after the obvious 25th moves, and of course 26...Re6?? 27.Qxh7+ leads to mate. What I missed is 26...Qxd3! and Black is worse after the exchanges, but the game continues.

Apr-12-09

patzer2 : For the Friday April 10, 2009 puzzle solution, White initiates a deep discovered attack combination with 24. e5!!

Apr-13-09

Sastre : Gilmoy,

If 26.Rf6 Re6, then 27.Qxh7+ Kf8 28.Rxf7#

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