| Jul-05-18 | | rgr459: 17. Ra2? seems like a waste of time, and it allows black to gain an initiative on the queenside such that by move 22 white is completely passive. |
|
| Jul-09-18 | | spazzky: 15 Ne5 was already off the rails |
|
| Aug-05-18 | | siggemannen: Well, if not Ne5 then Bxh2 is most likely just winning.
But Ra2 does indeed look bad. |
|
Oct-07-18
 | | Breunor: Stockfish gives 15 Ne5 as best but white is already a little behind. It looks like white loses the advantage with 11 a3; Stockfish prefers Qc2. |
|
Jul-29-20
 | | Phony Benoni: Interesting. Yesterday we sacrificed a rok for a Q+N mating attack. Today, we sacrifice a knight for a Q+R mating attack! |
|
| Jul-29-20 | | Fish55: 26...Ne4 is a very pretty move. |
|
Jul-29-20
 | | An Englishman: Good Evening: Therefore, <Phony Benoni>, tomorrow we shall sacrifice a Queen for a R+N mating attack! Wait one moment--did I just become the first person to solve a puzzle before I even saw it? |
|
| Jul-29-20 | | Walter Glattke: A) 27.Qb3 Qf2+ 28.Kh1 Ng3+ 29.hxg3 Rh5#
B) 27.Qd2 Rg5+ 28.Kf1 (B2 Kh1 Ng3+/Nf2+) Qh3+ 29.Ke1 Rg1+ 30.Qf1 QxQ# C) in the match 28.Qd8+ QxQ 29.Kxf2 Qd2+ decisive material (Q for R) |
|
| Jul-29-20 | | saturn2: 26...Ne4 decides
27. Qe2 Rg5+ 28. Kf1 Qh3+ 29. Ke1 Rg1 R for Q
27. f4 Qf2+ 28. Kh1 Qxb2 piece
27. fxe4 Rf2 mate soon |
|
| Jul-29-20 | | saturn2: <Walter Glattke: A) 27.Qb3 Qf2+> 27.. Rg5+ is a quicker mate in two
28 Kh1 Nf2 mate or
28 Kf1 Qf2 mate |
|
| Jul-29-20 | | agb2002: Black has a bishop for a knight.
Black can exploit the many weaknesses in White's position with 26... Rg5+: A) 27.Kf1 Qh3+ (27... Qxh2 28.Qd8+ Kf7 29.Qxg5) 28.Ke1 (28.Ke(f)2 Qxh2+ 29.Ke(f)1 Rg1#) 28... Rg1+ wins decisive material. B) 27.Kh1 Ne4
B.1) 28.fxe4 Qxe4+ 29.Qf3 Qxf3#.
B.2) 28.Qd8+ Kf7 29.Qd7+ (29.Qxg5 Nf2+ wins decisive material) 29... Kg6 30.Qxe6+ Kh5 B.2.a) 31.Qf7+ Kh6 32.Qe6+ g6 33.Rf1 (33.Qg4 Nf2+ wins decisive material) 33... Nf2+ 34.Rxf2 Qxf2 wins. B.2.b) 31.Qe8+ g6 (31... Kh6 32.Qc6+) 32.Rf1 Nf2+ as above. |
|
| Jul-29-20 | | Brenin: 23 ... Ne4 is not hard to see, but after 24 fxe4 Black must definitely not play the tempting Qf2+ 25 Kh1, when it is White who is winning, e.g. 25 ... Rf3 (or any other safe R move) 26 Bd4. |
|
Jul-29-20
 | | alexrawlings: I went for <26.. Rxg5+> and didn’t even see or consider <26.. Ne4>. Probably because the check felt so forcing I thought I must be on the right path so didn’t stop to look for any other candidate moves. Maybe I’ll remember this pattern in future... Having ran it through my chess app it looks like this loses most of black’s advantage. After <26.. Rg5+ 27 Kh1> if black now tries <27.. Ne4> then white has <28 Qd8+ Kf7 29 Qc7+ Kg6 30 Qc2> and the knight on e4 is pinned and white is winning. |
|
| Jul-29-20 | | malt: 26...Ne4 seems to tick the box, 27.f4 looks to hold out longer. 27.fe4 Rf2 wins
27.Qe2/Qe1 succumb to 27...Rg5+
27...Qf2+ 28.Kh1 Q:b2 Δ 29...♘f2+ |
|
| Jul-29-20 | | TheBish: Bonus problem: Why wouldn't 25. Rf2 have helped White? (And 25. gxf3 is similar to the game, only easier.)
click for larger viewBlack to play (25...?) |
|
| Jul-29-20 | | NBZ: I ended up going for 26. ... Qh3, when the f3 pawn can't be defended. Less flashy than the knight sacrifice, but it still appears to win. |
|
| Jul-29-20 | | mel gibson: It took me more than 15 seconds to see the solution. Stockfish 11 says:
26... Ne4
(26. .. Ne4 (♘c5-e4 f3-f4 ♕h4-f2+ ♔g1-h1 ♕f2xe3 ♗b2-c1 ♘e4-f2+
♔h1-g2 ♘f2xd1 ♗c1xe3 ♘d1xe3+ ♔g2-g3 ♘e3-d5 ♖a1-b1 ♖f5xf4 ♔g3-g2 ♘d5-e3+
♔g2-g3 ♖f4-a4 ♔g3-f3 ♖a4xa3 ♔f3-e4 ♘e3-d5 ♔e4-d4 b5-b4 ♔d4-c5 a6-a5 ♔c5-d6
b4-b3 ♔d6xe6 ♘d5-c3 ♖b1-b2 ♘c3-a4 ♖b2-d2 h7-h5 ♖d2-d8+ ♔g8-h7 ♖d8-b8 b3-b2
♔e6-f7 ♖a3-a1 e5-e6 ♖a1-f1+ ♔f7-e8 b2-b1♕ ♖b8xb1 ♖f1xb1 e6-e7 ♔h7-g8 ♔e8-d7
♖b1-d1+ ♔d7-c6 ♖d1-e1 ♔c6-b5 ♘a4-c3+ ♔b5xa5) +11.82/39 361) score for Black +11.82 depth 39 |
|
| Jul-29-20 | | Whitehat1963: Easier than yesterday’s for me, and I often struggle with Wednesday puzzles. I rarely get Thursday puzzles. Whenever I do, invariably, most people agree that it was easy for a Thursday puzzle. |
|
| Jul-29-20 | | TheaN: I got <26....Ne4> relatively quickly, and glanced that capturing would be bad for White. However, I lost a fair share of time on the declines: the queen moves protecting f2, else follows 27....Qf2+ 28.Kh1 Ng3+! 29.hxg3 Rh5#. However, all of them allow the major pieces to invade after 27....Rg5+ with 28....Qh3+ (if Kh1 then Nf2+ is always destructive). Because that took me a while, I settled on the main line with <27.fxe4 Rg5+?!<>> which is obviously not Black's best (<27....Rf2!> as in game followed by <28.Qd8+ (else mate) Qxd8 29.Kxf2 Qd2+> -+). It has some interesting lines though, and it's -5 vs -8, so the difference is to cope with. My line's just -3 and then it becomes a bit wary. Obviously White will have to play <28.Kf1 (Kh1 Qxe4+ 29.Qf3 Qxf3#) Qh3+ -3<>> surprisingly, 28....h6! -5 is Black's best, as he wants to take on e4 rather than playing Qh3 <30.Ke2<>> all other defenses lose fast because Black can force a king and queen skewer and start picking off e-pawns. <30....Qxh2+ 31.Kd3 Qxb2 -+<>>
click for larger view
At first glance, Black's just up a pawn. But the e-pawns are a disaster to happen, and frankly, what's White playing? He's as good as in zugzwang here: the king can't move, the rook's protecting a3 and the queen's protecting b3. The only 'salvage' SF9 sees is 31.Qc1 Qb3+ 32.Qc3 Qxc3+ 33.Kxc3 Rxe5 -+ which will just lead to an agonizing endgame for Black. |
|
Jul-29-20
 | | sbevan: I like
26...Nd3.
wins in all variations that I can see.
Also blocks Qd8+
Two groups of moves:
A. Q moves
B. K moves
A Q moves
1. 27. Qxd3
1 a) 27... Rg5+
28 Kf1 Qxh2 and no way to prevent mate on h1
1 b) 27... Rg5+
28 Kh1 Qf2 and no way to prevent mate on g2 or h2
1. 27. Qc3 (threat – Qxe6+)
1 a) 27... Rg5+
28 Kh1 (forced) Nf2++
B K moves. It’s interesting to anlayze any K move. All lose, as the N controls the f2 square. 1. 27. K h1, loses the Q. Which also blunts the attack on d8 as the R will run out of checks (after retaking the N). Also the back rank mate is coming.
2. 27. Kf1 is ++
3. 27. Kg2 runs into Qf2+ and mate to follow (Rg5 threatens Qg2++. If sacrifice the Q. then Qxf3+ is curtains.) |
|
| Jul-29-20 | | RandomVisitor: 17.Re2 with a pawn sac keeps white even...
click for larger viewStockfish_20071720_x64_modern:
<55/46 06:04 0.00 17.Re2 Nxe5 18.Bxe5 Rxe5 19.Rd2> Qf6 20.Rd7 b5 21.Bb3 Rf8 22.Ra2 Rf5 23.Rxc7 Bd5 24.Bxd5 Rxd5 25.Qb1 Rfd8 26.Rc1 Qg6 27.Rac2 Rg5 28.g3 Rgd5 29.Rc8 h5 30.h4 Kh7 31.Rxd8 Rxd8 32.a4 bxa4 33.Qa2 Rd3 34.Qxa4 Rxe3 35.fxe3 Qxg3+ 36.Kf1 Qf3+ |
|
| Jul-29-20 | | RandomVisitor: 14.Qc2 was likely an improvement.
click for larger viewStockfish_20071720_x64_modern:
<50/26 07:04 0.00 14.Qc2 b5 15.Ba2 Nb6 16.Ne2> Rf6 17.d5 Rh6 18.dxe6 Bxh2+ 19.Nxh2 Rxh2 20.Red1 Nc4 21.Bxc4 Rh1+ 22.Kxh1 Qh4+ 23.Kg1 Qxf2+ 24.Kh2 Qh4+ 25.Kg1 |
|
Jul-29-20
 | | eternaloptimist: It took me a few minutes to solve it but once I noticed how weak Timofeev’s 2nd rank was then I saw that 26...♘e4! is the correct move! |
|
| Jul-29-20 | | sophiephilo: just didnt get this |
|
Kibitzing
sac: 23...exf3