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|Oct-18-13|| ||LoveThatJoker: According to Stockfish, my lines are fully correct and winning: I went with the alternate win, 22...Rh2. |
With best play from both sides, and at a depth of 24, Stockfish gives a winning evaluation in Black's favour of <-4.00>; the evaluation is even higher in my lines which are human and plausible.
The following represents Stockfish's best play for both sides:
22..Rh2 23. Rf3 O-O-O 24. c4 Rdh8 25. Kf1 Bxf3 26. gxf3 Rh1+ 27. Ke2 R8h2+ 28. Kd3 Ne5+ 29. Kc3 Nxf3 30. Ne4 f5 31. Nd6+ Kb8 32. Nf7 Rh3 33. Kb4 e5 34. c5 g4 35. Bd5 Rd1 36. Bb3 Rd4+ 37. Ka5 f4
I didn't nail yesterday's puzzle as thoroughly as I would have liked to - even though both Stockish and Bartimaeus proved that my line lead to a clearly won game.
Today, I can say that I nailed it! And I'm glad about that!
|Oct-18-13|| ||al wazir: I would have played 22...Rh2 instead of Rg3, but it transposes into the game line next move. |
And then, since black is down a piece to two ♙s, I probably would have settled for a draw.
|Oct-18-13|| ||diagonalley: a brilliant (and very instructive) attack by tukmakov... sadly i didn't get the necessary preparatory move|
|Oct-18-13|| ||An Englishman: Good Evening: If your opponent has wasted a tempo to try and get you to waste a tempo instead of playing the move you want to play, consider playing the move you want to play anyhow.|
However, I don't feel certain that White had better than 20.Ne4. 20.Rf3,Bc6; 21.Rg3,Bf2; 22.Rxg4?,Rxh3X, so 22.Rd3,Rd8!?; 23.Rxd8+,Kxd8 and Black still has threats.
Even if Black had no mating attack at the end, he surely would win in the long run; White has nothing on the King side to defend against the passed pawns.
|Oct-18-13|| ||agb2002: The material is identical.
White threatens 21.Nxc5, 21.Nf6+, 21.Nxg5, 21.Bxg5.
The first idea that comes to mind is 20... Bc6, aiming at the white king:
A) 21.Nxc5 Rxh3+ 22.Kg1 Rh2
A.1) 23.g3 Rh1#.
A.2) 23.Ba4 Rxg2+ 24.Kh1 Rh2+ 25.Kg1 Rh1#.
A.3) 23.Rf2 0-0-0
A.3.a) 24.Bxg5 Rdh8 25.Kf1 Nxf2 26.Kxf2 Rxg2+ 27.Ke3 (else 27... Rh8#) 27... Rxg5 - + [R+P vs N].
A.3.b) 24.Nd3 Rdh8 25.Kf1 Nxf2 followed by 26... Rxg2 - + [R+2P vs B+N] and the threats 27... Rhh2 and 27... g4.
A.3.c) 24.Kf1 Nxf2 25.Kxf2 Rxg2+ 26.Ke3 e5 with the mate threat 27... Rh3# looks winning.
A.4) 23.Rf3 0-0-0
A.4.a) 24.Bxg5 Rdh8 25.Kf1 (25.Rh3 Rxg2+ 26.Kf1 Rxh3) 25... Rh1+ 26.Ke2 Bxf3+ 27.gxf3 (27.Kxf3 Nh2+ and 28... Rxa1 - + [R+P vs B]) 27... R8h2+ 28.Kd3 Nf2+ and 29... Rxa1 - + [R+P vs B].
A.4.b) 24.Nd3 Rdh8 25.Kf1 Bxf3 26.gxf3 Rh1+ 27.Ke2 (27.Kg2 R8h2+ 28.Kg3 Rg1#) 27... R8h2+ 28.Nf2 Rxf2+ 29.Kd3 Rxf3+ followed by 30... Rff1 winning.
A.4.c) 24.Kf1 Bxf3 25.gxf3 Rd1#.
B) 21.Re1 Bxe4 22.Rxe4 Nf2+ and 23... Nxe4.
|Oct-18-13|| ||Bartimaeus: A queenless middlegame position today. Though material is equal, Black has boxed the White king into a corner. If black can castle, then he'd really be able to get all pieces swarming on the white king. This could either lead to mate or winning of major material. However, black's powerful DSB is being threatened. Rather than trying to save it, seems better to give it up and open up the white kingside. Bc6 seems a powerful move to achieve this.|
20...Bc6 21. Nxc5 (seems best to make some luft for the king) Rxh3+ 22. Kg1 Rh2 23. Rd1 (prevent long castle) Rxg2+ 24. Kf1 Nh2+ (needed before Ke7 to prevent an immediate Bxg5+) 25. Ke1 Ke7
Now black has a far superior position and once the second rook gets to the h-file, white will be in major trouble. Good puzzle to end the week.
|Oct-18-13|| ||Nick46: 1963 seems to have been a vintage year for PsOTD.|
|Oct-18-13|| ||gofer: Pretty easy today...
<20 ... Bc6>
<21 Nxc5 Rxh3+>
<22 Kg1 Rg3>
I don't think white can allow R+B+N to combine in front of the king with the threat of Ra8 coming to join in too...
<23 Rf2 Nxf2>
<24 Kxf2 Rxg2+>
<25 Kf1/Ke3 O-O-O>
The king-side pawn storm will kill black dead in the long-term. In the short-term the rooks and bishop will combine to win material or mate.
Nice finish from black!
|Oct-18-13|| ||lost in space: I got the basic idea of the attack, but I would have played 22...Rh2 instead of 22...Rg3; I am quite certain that this transposes to the game-line.|
|Oct-18-13|| ||mistreaver: Friday. Black to play. Difficult. 20 ...?
I thought of th following:
21 gxh3 Bc6
22 Re1 Bxe4+
23 Rxe4 Nf2+
24 Kf1 Nxe4
and black is a pawn up.
Time to check.
Oh, poor calculation, white plays 22 gxh4 and wins. I didn't think that after Bxc6 black's attack breaks through and i went to overlook a simple pawn move.
|Oct-18-13|| ||Stormbringer: I had a similar idea to mistreaver (take with the rook first), except that I wanted to put additional pressure on the pinned knight with the f pawn. Not sure if lufting the king so that the second rook would get past for more checks on the h file was enough compensation for exposing the king to the double barrelled ack ack bishops. |
What do the silicon monsters have to say about going in with the rook first?
|Oct-18-13|| ||jacopovit: What if White would have played
21.Nxg5 with maybe Nf3 after f6 to protect the diagonal? Position looks clearly scary but I do not find an immediate win.
|Oct-18-13|| ||hedgeh0g: <jacopovit: What if White would have played
21.Nxg5 with maybe Nf3 after f6 to protect the diagonal? Position looks clearly scary but I do not find an immediate win.>|
21.Nxg5 f6 22.Nf3 (22.Bxe6 Nf2+) 22...Nf2+ 23.Kh2 Bxf3 24.gxf3 Nxh3 looks pretty convincing to me.
|Oct-18-13|| ||kevin86: The quiet bishop move to the long diagonal is the key.|
|Oct-18-13|| ||chrisowen: I cascade for one d7 in c6 see cages in be feckle,
see one knight eg fad in damage off re you have,
chubb a daggers aim drawn afraid d7 cold cleric to,
finger g2 cup it now in ko giving bad hoods a harangue 18.h3 instead a managing 18.h4 should hold,
a gog queen bind better off in glean effect berth,
fold to buffer solution bag hoofed it fun grab to finish off re every king east coast slide d6 in c5,
fade at eg devious three move combo in get rook knight good had check off in h1 why a gentle bone,
for 20.Ne4 seems a fog best I opine c6 first as,
given time unwinding g2 key fob 20...Bc6 light bade in cuff link g5 or key park c5 to reconcile his difference stab in the dark be a 21.Nxg5 line,
castle wide at I 21...0-0-0 free introspect re ghosting at enact better justice c8 safe all pieces trained on g1 g2 h3 after d8 moves in g8 face off.
Black has won the day king be agile not enough coordination eg at 22.Bf4 Rdg8 made tukmakov in estrange light wobble up fat 23.Rf3 thin picking
hone wins the rook in pocket see hup h5 at gains light knight for free bishop and a rook aheading so-
ok debatable change again be a 21.Nxc5 piece down
be hoofing h8 in h3 check particluar nuisance in
details at ok a 21...Rxh3+ a point guard it zip in,
affable dawdling on educate in wrestle a king to,
the ground am at 22.Kg1 Rg3 either in chap winch up pet rowing bold at efface in got 23.Rf2 or drill straight away in deaf call it is za bind in leg.
23.Rd1 Rxg2+ gold to be found goggle yes a g4 eg,
head-off a king lead astray to fakes knight it edge had at in each 24.Kf1 Nh2+ hilights the necessity,
ramble monkey be banks 25.Ke1 few good men left out tick indeed curfew at chins 25...Rg1+ etc oomph in digger 26.Kd2 0-0-0+ clearly won d3 tracks back an f3+ prove sacrifice justified in cramp clink
(5.07) on going 25...Ke7 light came g5+ restore in gentle d3 calms the dark square bishos stays put kind of badges 26.Nd3 Rh8 be huffling beck and call scarf in case pollinated ah baffling it eddy in elegy on freedom 27.Be3 fold mate in four at flights 27...Nf3+ at king to bullshin 28.Kf1 Nd2+ and caved it is down in da chin c6 mage wins wads a rook d1 it doctor in dig be affirmative in blew gate-keep 29.Ke1 Rh1+ only 30.Bg1 potent boot 30...Rhxg1#.
|Oct-18-13|| ||Jimfromprovidence: 20...Bc6 21 Nxg5 O-O-O (21..f6?! 22 Bxe6) 22 Bf4 Rdg8.|
click for larger view
The threat is 23...Rxg5, seeing 24...Rxh3#.
White has 23 Rf3 and I'm still working on black's response.
|Oct-18-13|| ||TimothyLucasJaeger: I went with 20 ... Rxh3+, planning 21 gxh3 Bc6 22 hxg4 Bxe4+ 23 Kh2 Bd6+ 24 Kh3 Ke7, failing to notice that 25 Bg5 and black's mating net falls apart.|
After 20...Bc6, I was worried about 21 Nxg5 f6 22 Bxe6, but computer analysis seems to suggest that 21 ... 0-0-0 is good for black.
Interesting and difficult puzzle.
|Oct-18-13|| ||Penguincw: I considered 20...Nf2+ to go into some sort of smothered's mate, until I saw the knight on e4,|
|Oct-18-13|| ||Kikoman: A brilliant finish. :D|
|Oct-18-13|| ||M.Hassan: "Difficult"
Black to play 20...?
I dentical in forces
Black is better both in materials and having 3 connected passed pawns and should win.
|Oct-18-13|| ||Abdel Irada: File me among those who chose 22. ...Rh2. I suppose that in the game, Black preferred 22. ...Rg3 as leaving the knight free to move, but in practice it looks like a difference that makes no difference.|
|Oct-18-13|| ||LIFE Master AJ: Instead of 23.Rd1, I played 23.Rf2. (It did not appear - to me, anyway- that you could allow the capture on g2.)|
|Oct-19-13|| ||Abdel Irada: <LIFE Master AJ: Instead of 23.Rd1, I played 23.Rf2. (It did not appear - to me, anyway- that you could allow the capture on g2.)>|
I don't see how that helps. After 23. Rf2, Nxf2 24. Kxf2 (what else?), Rxg2+, and whether White's king moves to f1 or e3, Black continues with 25. ...Ke7 followed by ...Rh8 with a whirlwind attack.
|Oct-21-13|| ||LIFE Master AJ: I was simply analyzing quickly and <only> in my head. I was just describing how I believed the situation appeared, it was NOT a statement of fact, nor was it meant to be interpreted as a chess truth. |
It was simply a personal observation ... if you have a problem with that, then that is <indeed> your problem, and your problem alone.
|Oct-21-13|| ||LIFE Master AJ: IF I had said that "I analyzed this with Fritz, and here is what the machine showed ... " ... ... ... and your examinations showed this to be false, then I could understand your taking issue with my statements ...|
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