| Sep-13-09 | | vonKrolock: <18.a5> 
click for larger view The next move <18...♗b5> introduces a fine combination - black invites the adversary to trap a ♘ and obtains two ♙♙s , and a strong attack in return - the resulting position after <22...fxg4> 
click for larger view arrives to be already overwhelming, so the original mistake was, in fact, the ready acceptance of the conditions... |
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Oct-31-20
 | | al wazir: I've noticed that almost all of the GOTDs and the puzzle games we've been getting lately end 0:1. Coincidence? Or are black wins intrinsically more interesting than white wins? |
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| Oct-31-20 | | Predrag3141: I could see to the end better after 23 ... g5 24 fxg5 Be5 -- clearly unacceptable to White. Instead, White has to allow Black to take over the dark squares with gxf4, etc. Stockfish finds a clever defense though: 23 ... g5 24 Nd7 Rf7 25 fxg5 Rxd7, returning the piece. The attack still rages though, and Black wins easily. |
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| Oct-31-20 | | Walter Glattke: Organic glattfish analysis: 20.-Nxg4+ 21.Kg1 Nxe3 +2.0 for black, but 21.-hxg4 allows 21.-Qh4+ 22.Kg1 (22.-Ng3 23.g5 Nxf1 24.Qxf1 draw) 22.-fxg4 threatens -g and mate, 23.Bd2 g3 24.Rf3 Qh2+ 25.Kf1 Qh1+ 26.Ke2 Qxg2+ 27.Kd3 Qh3 with black advantage. Better 26.-Nxf4 27.exf4 Bd4! (threatens mate on g1) 28.Be3 Bxe3 resign here, 29.Rxe3 Rxf4+ 30.Ke2 Qxg2+ 31.Kd3 Rd4+ 32.Kc3 Rxe3+ 33.Qd3 R3xd3# So, the scientist would say, the intentions builded an opening structure for black diagonals for black to win. I once had a test match, where I threatend mate several times, and then, when conventional moves failed then, I could win by threatening mate with a pseudo sacrifice, so I won material there, and here must be done moves for black square diagonals before. Grandmasters of the future must be able to read intentions or analyse diagrams, what happens before in moves and "intentions". But, of course, one must analyse many ways, many ply in 3 min. per move, to have Elo over 3000, so stockfish can, and I cannot. |
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| Oct-31-20 | | Ivan Karamazov: In my view, this problem, properly understood, is quite easy, not Very Difficult. If Black does nothing drastic , White wins a piece for a Pawn. The "sacrifice" 20...Nxg4+ 21.hxg4 Qh4+ 22.Kg1 fxg4 nets two Pawns, and an obviously strong attack, for the piece, and so is very clearly superior to that, regardless of whether it subsequently proves to be winning, drawing or losing. Since there is no reasonable alternative, the game continuation is forced, and does not need to be analyzed further, especially as White's subsequent choices do not appear to be forced. Incidentally, I am User: Dr. J I just felt like using a new "identity". |
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| Oct-31-20 | | agb2002: Black has a bishop and a knight for the bishop pair. White threatens gxh5.
I think I'd play 20... Nxg4+ 21.hxg4 (21.Kg1 Nxe3 wins two pawns at least) 21... Qh4+ 22.Kg1 (22.Bh3 Qg3+ 23.Kh1 Qxh3+ 24.Kg1 Ng3 looks winning) 22... fxg4: A) 23.Re1 Nxf4 wins a third pawn for the knight while keeping the attack (24.exf4 Rxe1+ wins). B) 23.Qc2 Nxf4
B.1) 24.exf4 Bd4+ 25.Be3 (25.Rf2 Re1+ 26.Bf1 Qg3+ 27.Kh1 Qh3+ and 28... Rxf1#) 25... Bxe3+ 26.Rf2 g3 wins decisive material. B.2) 24.Rxf4 Rxf4 25.exf4 Re1+ 26.Bf1 Bd4+ and mate soon. B.3) 24.Bd2 Nxg2 25.Kxg2 Qh3+ 26.Kg1 Qg3+ 27.Kh1 Rf2 28.Rxf2 Qxf2 29.Rc1 Rf8 30.Bc3 Rf1+ 31.Rxf1 Qxc2 wins. B.4) 24.Qf2 g3 wins.
C) 23.Qd2 Nxf4 24.Rxf4 Rxf4 25.exf4 Re1+ 26.Bf1 Bd4+ 27.Kg2 Qh3#. D) 23.Qe2 Nxf4 looks similar to previous lines.
E) 23.Qe1 g3 24.Rf3 Rxf4 looks very good for Black (25.Rxf4 Qh2+ 26.Kf1 Nxf4 27.Qc2 Nxg2 28.Qxg2 Rf8+ wins). F) 23.Re1 Nxf4 as above (24.Qd2 Nxg2 25.Kxg2 -25.Qxg2 Qxe1+ - 25... Qh3+ 26.Kg1 Qg3+ 27.Kh1 Rf2 wins). G) 23.Rf2 Nxf4 once again (24.Rxf4 Rxf4 25.exf4 Bd4+ wins; 24.exf4 Bd4 25.Qd2 Bxf2+ 26.Qxf2 Re1+ 27.Bf1 g3 28.Qg2 -28.Qxe1 Qh2#- 28... Re8, followed by R8e2, wins). |
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| Oct-31-20 | | Brenin: Easy for a Saturday: Black is losing a N, so it's obvious to take a few Ps with it, and open up White's K-side with the only forcing move 20 ... Nxg4+. If White declines this "sacrifice" with 21 Kg1 then 21 ... Nxe3 and he is 2P down. If he accepts with 21 hxg4 then the obvious follow-up 21 ... Qh4+ 22 Kg1 (Bh3 Qg3+ loses the B) fxg4. Now one has to see that White is helpless against g3 and Qh2+, and after 23 Bd2 g3 his least worst defence is 24 Bh3 Qxh3 24 Qe2 Nxf4 25 Rxf4 Rxf4, e.g. 26 Qg2 Qxg2+ 27 Kxg2 Rf2+ and 28 ... Rxd2, leaving Black a R+2P ahead. |
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| Oct-31-20 | | stacase: <Brenin: Easy for a Saturday> Agreed. 20...Nxg4+ was a no brainer, and 21...Qh4+ was the obvious next move. But 21...Nxf3 clears the way for Black's Bishop to cover g1. If White accepts a 2nd Knight sacrifice or not, Black's Queen will still show up ...Qh4+ or ...Qh4 I didn't consider any other moves moves after 21.hxg4 |
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| Oct-31-20 | | goodevans: <stacase: [...] But 21...Nxf3 clears the way for Black's Bishop to cover g1. If White accepts a 2nd Knight sacrifice or not, Black's Queen will still show up ...Qh4+ ...> But without the N on h5 black's <...Qh4+> can be safely defended against by <Bh3> so black must play <...Qh4+> before sac'ing the N. On the other hand, if you want to play <...Nxf4> earlier then I think it can be played okay before <... Qh2+> and even before <...g3>. |
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| Oct-31-20 | | Walter Glattke: Black loses by 21.-Nxf3 22.Kg3 (knight no escape) Nxg2 23.Kxg2 Qh4 24.Rh1 |
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| Oct-31-20 | | Messiah: <Ivan Karamazov: In my view, this problem, properly understood, is quite easy, not Very Difficult.> I completely agree. |
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Oct-31-20
 | | chrisowen: Ng4 it was a hatch no? |
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| Oct-31-20 | | Cheapo by the Dozen: Odd starting point for the puzzle. Black has to lose a piece, so the first move is obvious. Then the second move is pretty obvious too -- it gains material, adds an attacker, and opens up the f-file, which is important toward attacking f4 as a way to deflect the e3 pawn and open the d4-g1 diagonal. |
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| Oct-31-20 | | scruggs: The knight move jumps at you |
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| Oct-31-20 | | Who is me: It did not jump at me .
JUST STARTING CHESS |
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Oct-31-20
 | | OhioChessFan: <Wim> keep looking at daily puzzles and you'll begin to see patterns. In this case, Black has a Knight at h5 attacked by a Pawn. Black can't move the Knight anywhere safe. But, Black can capture the attacking piece, the g4 Pawn by Nxg4. With check. That should make you think something good can happen. When White plays hxg4, you see another check-Qh4. And it gets easier to see what Black should do. Back to the original position, if the Knight on f6 wasn't there, Black's Queen could swoop down to h4. So you'd think, "How can I get that Knight out of the way? How about with a check?" And sure enough, it all works out. There's nothing hard about using checks to make the other guy stop everything and deal with the check. Knowing when is the hard part. But if you keep working at it, it gets easier, because you see the same patterns over and over. |
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Oct-31-20
 | | PawnSac: < al wazir: I've noticed that almost all of the GOTDs and the puzzle games we've been getting lately end 0:1. Coincidence? Or are black wins intrinsically more interesting than white wins? > Are you trying to say Black Wins Matter? lol
< OhioChessFan: There's nothing hard about using checks to make the other guy stop everything and deal with the check. Knowing when is the hard part. > In this case knowing when was easy! Black's Nh5 was trapped. The sac on g4 wins 2 pawns for the knight, and without searching the board for other obscure possibilities, Nxg4 seems to get the most material for the piece, whether or not there was an attacking continuation. But also, in this case it was also easy to see that after ..Nxg4 hxg4 Qh4+ Kg1 fxg that the push to g3 throws a mating net at the white monarch, so one can be hopeful and just sac as though it was intended. The comical part is that white actually forced black to launch a winning attack! hahaha |
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| Oct-31-20 | | mel gibson: I thought this puzzle was easy - more
a Tuesday or Wednesday level.
Stockfish 12 says:
(20. .. Nxg4+
(♘f6xg4+ h3xg4 ♕d8-h4+ ♔h2-g1 f5xg4 ♘b6-d7 ♖f8-f7 ♖a1-a2
♖f7xd7 b2-b3 ♖d7-e7 ♗g2-f3 g4xf3 ♕d1xf3 ♖e7-f7 ♖a2-c2 b5-b4 ♖c2-h2 ♕h4-e7
♕f3-d1 ♕e7-f6 ♖h2-g2 ♕f6-f5 ♕d1-c2 ♘h5-g3 ♕c2xf5 ♘g3xf5 ♖g2-a2 ♘f5xe3
♖f1-e1 ♖f7xf4 a5-a6 b7xa6 ♗c1xe3 ♖f4-e4 ♖a2xa6 ♗g7-f8 ♗e3-f2 ♖e4xe1+ ♗f2xe1
♖e8xe1+ ♔g1-f2 ♖e1-d1 ♔f2-e3 ♖d1xd5 ♖a6-a1) +8.56/33 418) score for Black +8.56 depth 33 |
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Kibitzing
sac: 20...Nxg4+