Andrei Istratescu vs Alexander Chernin (1997)

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Kibitzing

Andrei Istratescu vs Alexander Chernin
Groningen Candidates (1997) (rapid), Groningen NED, rd 1, Dec-10
Formation: King's Indian Attack (A07) · 1-0

ANALYSIS [x]

FEN COPIED

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sac: 58.Rxg7+	PGN: download \| view \| print	Help: general \| java-troubleshooting

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< Earlier Kibitzing · PAGE 2 OF 2 · Later Kibitzing>
Nov-13-12		JimmyRockHound: Drawing chances? I managed to lose as white playing this game on from here!

Nov-13-12		thegoldenband: <M.Hassan> <61.Qxe8+ Kh7 62.Qd7+ Kg8 63.e6!> OTB, I'd sooner play something like 62. Qf7+, 63. Qf6+ and 64. Qd6, ending all chance of perpetual check and getting ready to advance e5-e6. I haven't checked this with an engine, mind, but in general I'd rather straightforwardly keep control of the position than play the prettiest option.

Nov-13-12		Jason Frost: <stst> Probably not up until 62.Qf7+, but you should be careful rushing as 63...Qd1+ looks like perpetual.

Nov-13-12		Patriot: 58.Rxg7+ 58...Kxg7 59.Qd7+ Kg8 (59...Kf8 60.Bb4+ ) 60.Qxe8+ Kg7 61.Qd7+ Kg8 62.Qc8+ Kh7 63.Qc7+ Kg8 64.Qc4+ 58...Kh8 59.Rh7+ Kxh7 Qd7+ (similar to above) The main thing here is to avoid perpetual.

Nov-13-12		diagonalley: yep... easy enough to win the rook... (i assume as it's only tuesday, that's the puzzle?) but OTB i'd make sure to avoid any possibility of perpetual by withdrawing the Q to d2. the B & e-pawn would then decide.

Nov-13-12		Abdel Irada: <<•>A hard day's "easy"<•>> Whether this puzzle is easy or hard depends on the objective you set for yourself in it: To win material (with check) is easy enough; to finish the game, not so easy. In any case, one begins: <<•>58. Rxg7†...> Now Black has to decide whether to take the rook immediately or wait a move. <(1) 58. ...Kh8> We'll assume Black is as uncooperative as possible. Does it make a difference? <59. Rh7†, Kxh7> No choice about this one. <60. Qf7†, Kh8 61. Qxe8† > Apparently Black has no choice, so let's examine the capture. <<•>(2) 58. ...Kxg7 59. Qd7†...> Apart from the futile 59. ...Re7, Black has three king retreats. <(2.1) 59. ...Kh8 60. Qxe8† > <(2.2) 59. ...Kg8 60. Qxe8† > <<•>(2.3) 59. ...Kf8 60. Bb4†, Kg8 61. Qxe8† > Okay. We've won back the rook with check (and a bishop by way of interest). But how do we put the game out of reach, given that with careless play, Black has a perpetual? We'll assume Black doesn't let the bishop into his kingside with check. Continuing from (2.3) above: <<•>61. ...Kh7 62. Qd7†!, Kg8> It doesn't appear to matter much whether the king goes here or to h8. Now, of course, one could play 63. Qd2, holding everything and preventing a perpetual, and win gradually with the extra bishop and passed e-pawn. But I think there's a faster way. <<•>63. Be7...> click for larger view <[The position after 63. Be7]> Now this is worth noting: By playing 62. Qd7†, White prevents the assured perpetual that would result if the black queen had access to d1. From that square, she could corral the white king and check from h5 if it ever ran to h3, ensuring the draw. This leaves two remaining checking squares, since c5 is controlled by the bishop, and the difference between them seems minimal. Let's assume she checks from the light square, keeping the option of playing ...Qf5† and trading queens (which loses, but prevents immediate mate). <<•>63. ...Qb1† 64. Kh2, Qc2† 65. Kh3...> We are, of course, pragmatic and willing to simplify into an easily won ending. But does Black have anything better? There are no useful king moves, so other than the queen exchange on f5, Black has three plausible continuations. <(2.3.1) 65. ...Qe2> Black hopes for perpetual check with ...Qh5†, etc. <66. Qe8†, Kh7> If 66. ...Kg7; 67. Bf6† and mate next move. <67. Qf7†, Kh8 68. Bf6#> First objection struck down: There is no perpetual. <(2.3.2) 65. ...h5 66. Qe8†, Kh7 67. Qf7†> Black will be mated next move: (a) 67. ...Kh8; 68. Bf6# or (b) 67. ...Kh6; 68. Bf8#/Bg5#. <(2.3.3) 65. ...g5 66. Qe8†, Kg7 67. Bf6†, Kh7 68. Qf7#> It is now clear that Black cannot survive except by offering the queen trade: 65. ...Qf5†; 66. Qxf5, gxf5; 67. e6. And from here, I will rely upon it that virtually anyone can win the ensuing ending.

Nov-13-12		morfishine: Slippery, since White must avoid the perpetual after reaching a winning position: White is winning after <58.Rxg7+ Kxg7 59.Qd7+ Kf8 60.Bb4+ Kg8 61.Qxe8+> since he is up a piece and a pawn Here, White must be accurate: <61...Kh7 62.Qf7+ Kh8 63.Qf6+ (not 63.Bf8 Qd1+)...Kh7 64.Qd6> click for larger view If <64...Qb3 65.Kf2 Qc2+ 66.Bd2> and Black is without resource (I think!) Now for the fun part, and for this I'm using a board: One possible continuation: <66...Qf5 67.Qe7 Kg8 68.Qh4 Kh7 69.g4 Qd3 70.Qe7+ Kg8 71.Qb4 Qh3 72.Qc4+ Kg7 73.Qe2> click for larger view This seems a little lengthy, so perhaps <66.Qd2> is more accurate After <66.Qd2 Qf5 67.Qe2 Qe6 68.Bd6 Qh3 69.Qf3 Qh2+ 70.Ke3 Qg1+ 71.Ke4 Qb1+ 72.Kd4 Qb2+ 73.Qc3 Qf2+ 74.Kd5 Qg2+ 75.Ke6 Qh3+ 76.Ke7 Qf5 77.Qc7 h5 78.ke8+ Kh8 79.Qd7 Qe4 80.e6 Qa8+ 81.Ke7 Qf3 82.Be5+ Kg8 83.Qe8+ Kh7 84.Qh8 mate> click for larger view White wins in any case

Nov-13-12		vinidivici: I know Chernin, he's very good using French. But maybe, KID attack surprise him or something. I believe he expected Winawer or Advance.

Nov-13-12		zb2cr: Main line is simple. 58. Rxg7+, Kxg7; 59. Qd7+, Kf8; 60. Bb4+ and White wins back the sacrificed Rook. The line where Black refuses the Rook have been ably covered above by <LoveThatJoker> and <Abdel Irada>.

Nov-13-12		LoveThatJoker: <zb2cr> Thank you! LTJ

Nov-13-12		agb2002: White is a pawn up. Black threatens 58... Qxc3. White can fork the black king and rook after 58.Rxg7+ Kxg7 59.Qd7+, and win the rook with check after 59...Kf8 60.Bb4+. Then, White only needs to send the queen to d4 with checks to prepare e6-e7 and win the game.

Nov-13-12		Bengambit: 56.Rxg7+ (R sac and forced move) Kxg7 57.e6+ Qxc3 58. Qd7+

Nov-13-12		whiteshark: as <FSR> put it.

Nov-13-12		therevolver17: 58.Rxg7+ Kxg7 59.Qd7+ Kf8 60.Bb4+ Kg8 61.Qxe8+ (if 61..Kg7 than 62.Bf8+ (62..Kh8 63.Be7+) Kg8 63.Be7+ Kh7 64.Qf7+ Kh8 65.Bf6#) Kh7 Qd7+ and white has an easy win.

Nov-13-12		Conrad93: 58.Rxg7+ Kxg7 59.e6+ Qxc3 60.Qd7+ Kh8 and white wins.

Nov-13-12		Bengambit: If there is one thing that learned in playing chess,and that is "Destroy the Enemy" as quickly and quietly as possible.

Nov-13-12		kevin86: White can mate with the bishop or sac the bishop and mate with queen and pawn.

Nov-13-12		James D Flynn: White is an advanced pawn up and his pieces are aggressively placed. He can now win a piece by 58.Rxg7+ Kxg7 59.Qd7+ Kf8 60.Bb4+ Kg8 51.Qxe8+ Kg7. Now White has to avoid perpetual check by the Black Q: he has 2 possible approaches: 1) take the Black g6 pawn enable his K to walk up the hand g files, 2) Bring his Q back to e1 to shelter his K on his back rank and push the passed e pawn. 1) 52.Qf 7+ Kh2 53.Qf7+ Kh8 the pawn on g6 is protected by the Q and the Q cannot attack the h6 pawn so this plan goes nowhere. 2) 52.Qd7+ Kg8 53.Qd2 Qf5 54. Kf2 Kh7 55.Qe2 Qe6 56.Bd2 Kg7 57.g4 Kh7 58.Kg3 Kg7 59.Qe4 and now the f5 thrust cannot be stopped and will win the game.

Nov-13-12		Phony Benoni: I mentionend <58.Rxg7+ Kxg7 59.e6+> earlier, but didn't have the time to analyze it carefully. I think it wins, though whether it's "better" than the game is another question: click for larger view The main variation is 59...Qxc3 60.Qd7+ Kg8/h8 (it doesn't matter; the main point of playing e6+ is that ...Kf8 and ...Kf6 both walk into mate) 61.Qxe8+ Kg7/h7 62.Qf7+ Kh8 63.Qxg6: click for larger view White doesn't have his extra bishop, but he's two pawns up, the e-pawn is poised to promote, White's queen protects two important pawns and the crucial h5 square while confining Black's king, and most importantly White's king now has a clear path up the board to avoid the perpetual since Black's g-pawn is gone. It will take a few moves, but I think the outcome is clear. If Black avoids taking the bishop, we get these lines: 59...Kg8 60.e7+ Kh7 61.Qf7#. 59...Kh7 60.Qd7+ Re7 61.Qxe7+ Kg8 62.Qf7# 59...Kf8 60.Qd6+! Kg8 (60...Re7 61.Qd8+ Re8 62.Qf6+ Kg8 63.Qf7#) 61.Qd4! click for larger view White threatens mate on g7 or h8 (the point of driving the king to g8), while stopping Black's main perpetual threat with ...Qd1+/...Qh5+. Neither 61...Qb1+ 62.Kh2 Qc2+ 63.Kh3 Qf5+ 64.g4 or 61...Qb1+ 62.Kh2 Qa2+ 63.Bb2 (not 63.Ka3 Qxe6+) offer Black any hope. So it looks like Black would have to take the bishop and accept the position in the 2nd diagram. Whether that's an easier win for White than the game is another question.

Nov-13-12		chrisowen: Scuttle rookxg7+ we are sailing, king hog-tied to bank rank after qd7+ awkward bc3 gets into the action via b4 lesson to be learnt have a butchers hook over the ground to make sure theres no purp available once again handling 58.Rxg7+ quickest route had docking Kxg7 allow shoeshine id 59.Qd7+ drubbing home the point since black see you later c2 loose sight renegade qd7+ alligator king black open d2 seal fetching back in a while crocodile 59...kf8 60.bb4+ kg8 61.qxe8+ kh7 62.qd7+ pe5 will fasten e8 promo in.

Nov-13-12		pogotheclown: Took me the same five seconds to solve as yesterday's problem.

Nov-13-12		tbentley: My line had the inferior but still winning 59. e6+. Rybka's evaluation of 59. Qd7+ jumps to +13.36 at 17 ply, while 59. e6+ is only evaluated at +5.07.

Nov-13-12		rudiment: I... I was wrong.

Nov-13-12		offramp: Unbelievably prolix.

Nov-14-12		Conrad93: What's unbelievably prolix? If you can't read chess notation, pick up a chess book and learn.

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