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Later Kibitzing> |
| Jul-12-18 | | Mayankk: Got the first 3 moves in right order, first Bishop sac on h2 to get our Queen on h file with a tempo and attempt to sac another Bishop at g2 again. Note that Kxg2 runs into Qg4+ followed by a Rook lift which is pretty hopeless for White. I didn’t anticipate the f3 defence and I wouldn’t have found the Bh3 line, diverging with the simpler 17... Qg3 idea unfortunately. |
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| Jul-12-18 | | jith1207: <CHC>: no problem, you just described my mind perfectly, with the analogy of a buggy software. |
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Jul-12-18
 | | ChessHigherCat: <Mayankk> Here's the refutation of 17...Qg3, which you have to be a computer to see: 1) +5.54 (23 ply) 17...Qg3 18.Ne4 Qg6 19.Bxf5 Rxf5 20.Qxg2 Qxg2+ 21.Kxg2 a5 22.Rc1 c5 23.dxc5 Nxc5 24.Nxc5 bxc5 25.Rfd1 Rg5+ 26.Kf2 Rh5 27.Kg3 Rg5+ 28.Kf4 Rg2 29.Be5 a4 30.Rd7 axb3 31.axb3 h6 32.e4 Ra3 33.Rb7 Kh7 34.Rxc5 |
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| Jul-12-18 | | cocker: 18 Ne4, as suggested by <jith1207>, would have been a much better try. |
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| Jul-12-18 | | PJs Studio: Chess is pattern recognition. I figured this problem out in about three seconds... only because I’ve seen Nimzowitsch v Tarrasch. I’ve been playing terribly of late and wouldn’t have figuted this problem out. Is that all it takes? Having seen it all in previous study? Nimzowitsch vs Tarrasch, 1914 |
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| Jul-12-18 | | stacase: Way too easy for a Thursday. |
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Jul-12-18
 | | takchess: Streak ends here. I thought bh7+ followed by Qh5+ followed by Rook lift With a bishop sac if needed on the f3 square if the knight moved there. Wonder if there was a tactic for white here if they were on move.Nice Potd. |
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| Jul-12-18 | | Mayankk: Thanks CHC.
Black seems to have gotten into an almost perfect French defence position by move 10 - a strong knight on e4 which can’t be taken without giving the kingside Rook an open file as well as making the knight on f3 duck for cover. And there is no way to deny the Bishop a piece of action without taking the e4 knight. And the other Bishop and Queen are just waiting in the wings as well. |
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| Jul-12-18 | | saturn2: I went for the first 3 game moves and reckoned queen and rook would finish off the white king. I also saw the in between manouvre Bxe6+ d5 does not help white. |
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Jul-12-18
 | | Richard Taylor: A la Tarrasch. Strip away the K side. And then finish White off... |
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| Jul-12-18 | | malt: I had 13...B:h2+ 14.K:h2
(14.Kh1 Qh4 )14...Qh4+ 15.Kg1 Rf6 16.d5 Rh6
Missed the; Ye old double bishop sacrifice: <CHC> |
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| Jul-12-18 | | patzer2: Early in the opening, I prefer the popular moves 3. d4, 3. Nf6 or 3. g3 over the rarely played 3. e3. Our Opening Explorer records 3. e3 only haven been played three times, with the result being two wins for Black and one win for White. Perhaps the reason 3. e3 is so unpopular is because it gives White no advantage or initiative, as it allows Black to immediately equalize with 3...Bb7=, 3...d5 = or 3...Nf6=. |
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| Jul-12-18 | | patzer2: At first glance, I thought today's Thursday (13...?) puzzle was easy. I calculated a standard double Bishop sacrifice and Rook lift maneuver with 13...Bxh2+ 14. Kxh2 Qh4+ 15. Kg1 Bxg2, assuming White would play 16. Kxg2? and allow 16...Rf6 -+ (-11.11 @ 32 ply, Stockfish 8). What I missed is that 16. Kxg2? isn't forced. Not only is 16. Kxg2? not forced, it's really bad because it makes Black's win too easy after 16. Kxg2 Rf6 -+ (-11.11 @ 32 ply, Stockfish 8). White's best is the game move 16. Bxe6+, because it puts up maximum resistance and makes the win for Black much more difficult. After 16. Bxe6+ Kh8 17. f3, the only clear winning follow-up is 17...Bh3! -+ (-2.27 @ 33 ply, Stockfish 8). Indeed, finding 17...Bh3! is the key to solving the combination, as all others lose or draw. For example 17...Rf6? loses to 18. Bxf5! +- (+1.73 @ 29 ply, Stockfish 8), and 17...Bxf1 = (0.00 @ 33 ply, Stockfish 8) or 17...Qh1+ (0.00 @ 33 ply, Stockfish 8) lead to level positions. After 17...Bh3!, White made it easy for Black with 18. Qxc7? allowing 18...Rf6 -+ (-8.50 @ 30 ply, Stockfish 8). Instead, White could have put up much more resistance with 18. Ne5! Bxf1 (not 18...fxe4? 19. Bxh3 ∓) 19. Bxd7 Ba6 (not 19...Bh3? 20. Qf2 =) 20. Qxe4 Qf6 -+ (-2.27 @ 33 ply, Stockfish 8). P.S.: According to the computer, White's losing move was 13. Bxc4?, allowing today's Thursday solution 13...Bxh2+! -+ (-2.27 @ 33 ply, Stockfish 8). Instead, White could have secured practical drawing chances with 13. Be2 ∓, when play might go 13. Be2 cxb3 14. axb3 Qh4 15. g3 Qh6 16.Bf3 Bxf3 17. Nxf3 Qh5 18. Nd2 ∓ (-0.79 @ 31 ply, Stockfish 8). Earlier, instead of 11. Rad1? allowing 11..Nxd2 12. Nxd2 cxd4 ∓ (-0.79 @ 31 ply, Stockfish 8), White could have held it level with 11. cxd5 exd5 12. Ne5 = (0.00 @ 36 ply, Stockfish 8). IMO 11. Rad1? is where White's game went bad, and the missed move 11. cxd5 was White's best last chance to avoid an inferior position leading to a lost game. |
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| Jul-12-18 | | patzer2: <NM JRousselle:> Your 13. Nc4 is interesting and complicated, as it gives Black room to go wrong. Indeed, my Stockfish 8 shows it as equal up to 26 ply. However, once it reaches 27 ply, it switches the evaluation for 13. Nc4 to a win for Black. After 13. Nc4, Black apparently wins with 13...Bxh2+! 14. Kxh2 Qh4+ -+ (-4.11 @ 31 ply, Stockfish 8). |
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| Jul-12-18 | | Patriot: NM Dan Heisman has told me (when I was taking lessons) that it is more efficient to make a "pass move" to see what your opponent can do to you before looking to see what you can do to them. Here I think white is threatening Bxe6+ Kh8 Bxf5. I then calculated the right move sequence to win after considering white's defensive tries. |
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| Jul-12-18 | | Walter Glattke: The computer moves are nice, but what is after 17.Bxf5 instead of 17.f3, I wrote this above. |
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| Jul-12-18 | | AvidChessMan: I saw black's last move, 18...Rf6, first. White's d/e/f pawns closed off white's position, while black had multiple pressure points on the white king. Then I figured black's opening salvo had to be a check: 13...Bh2. |
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| Jul-12-18 | | patzer2: Correction: <Not only is 16. Kxg2? not forced, it's really bad because it makes Black's win too easy after 16. Kxg2 Rf6 -+ (-11.11 @ 32 ply, Stockfish 8).> I meant to write 16. Kxg2? is bad because Black wins too easy after 16. Kxg2? Qg4+ 17. Kh1 Rf6 -+ (-9.44 @ 37 ply, Stockfish 8) |
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Jul-12-18
 | | gawain: It is easy enough to see that both of Black's bishops are going to be sacrificed and the rook brought around to g6 or maybe h6 , but White has some interesting resources along that a2-g8 diagonal. |
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Jul-12-18
 | | keypusher: < Stacase: Way too easy for a Thursday.> That’s because you didn’t solve it. You saw the double-bishop sac pattern and assumed you’d solved it. |
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Jul-12-18
| | ChessHigherCat: <keypusher: < Stacase: Way too easy for a Thursday.> <That’s because you didn’t solve it. You saw the double-bishop sac pattern and assumed you’d solved it.> Exactly, that's I what I did, too: I saw the double bishop sac in less than a minute and got the first six moves right, but that means diddly-squat because I missed the 7. f3 defense and would have played the losing Qg3. |
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| Jul-12-18 | | CHESSTTCAMPS: In this early middlegame, material is even, but it is apparent that white has left the castled king position insufficiently defended with both the g-pawn and the h-pawn defended only once. With tandem bishops aimed at both weak points and the queen available for rapid deployment, this is a setting for a steriotypical bishop sac: 13... Bxh2+! 14.Kxh2 (Kh1 Qh4 is even worse) Qh4+ 15.Kg1 Bxg2! (better that the immediate rook lift that was my first considered alternative) and now: A. 16.Kxg2 Qg4+ 17.Kh1 (or h2) Rf6 and the threat of Rh6+ wins. B. 16.Bxe6+ Kh8 17.Kxg2 (Bxf5 Qh1#) Qg4+ 18.Kh1/h2 Rf6 is similar to A. C. 16.f3 Qg3 17.Rf2 Bh3+ 18.Kh1 Qxf2 19.Bxe6+ Kh8 20.Rg1 Rf6, with the lethal threat of 21... Bg2+ 22.Rxg2 Rh6+ 23.Rh2 Qxh2#. Review time... |
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| Jul-12-18 | | CHESSTTCAMPS: Yep, it seems I missed 17.Ne4 in line C, pointed out in earlier posts. |
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| Jul-13-18 | | PJs Studio: Without deep knowledge of the position how could white POSSIBLY think after 12.Nxd2? He was hopelessly busted?! Gives a deeper appreciation for a player like Magnus to lose so few games when given the depth of knowledge each GM can (and does!) possess. |
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Jul-14-18
 | | Dionysius1: No he wasn't busted. Apparently the sacrifices at 13... and 16... don't work if white plays 13. ♗e2 instead of 13. ♗xc4 |
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Kibitzing
sac: 13...Bxh2+