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Later Kibitzing> |
| Mar-17-14 | | choumicha: after more than 6 years ...
<Jimfromprovidence: I looked at MAJ”s comments about an alternative line for black."23. Bf6 gxf6 24. f4 Rxb3! <prevents rook lift, threatens Re3> 25. axb3 Rb8 26. Qh6 <prevents K's escape> Rxb3 <again, prevents rook lift>">
it is after 23.Bf6 gxf 24.f4 Rxb3 25.ab Rb8 again
click for larger view26.f5! which wins f.E.
26...Rxb3
27.fxe Qe7
28.Rf4 |
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| Sep-06-20 | | Walter Glattke: White is a pawn behind and threatens 20.Bxh7+ Kxh7 21.Qh5+ Kg8 22.Bxe5 Qd8 23.Bxb8 Qxb8 R for N white advantage "2.0" glattfishly" said. 22.-d6 23.Bf6, (23.Bxg7? Kxg7 24.f4 Kh6 25.Rf3 Qg7 26.Rh3+ Kg8!) Bd4 24.Bxd4 e5 a piece more for white, otherwise mate with f4/Rf3 Rh3 etc. (24.f4!? Bxf6 25.Rf3 g6 26.Qh6 Bg7 27.Qh4 f5) |
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| Sep-06-20 | | drollere: pretty straightforward. the fact that the white KB was about to fall made the sacrifice easy to see, and after Qh5+ the capture on e5. 23. Bf6 was a pretty forcing move. |
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Sep-06-20
 | | An Englishman: Good Evening: You have to see move 23, and I did not, so we have yet another 5/7 week. At least me poor 3 remaining brain cells haven't decayed even worse. |
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| Sep-06-20 | | Thumbtack2007: 22..d6 is a mistake; 22..Bd6 evens the game. |
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| Sep-06-20 | | RandomVisitor: After 22...Bd6 things even up a bit, as previously mentioned:
click for larger viewStockfish_20090418_x64_modern:
Found 510 tablebases
NNUE evaluation using nn-308d71810dff.nnue enabled <45/62 20:40 +0.39 23.Bb2 f6 24.Rae1 Bb4 25.Re3 Qf4> 26.g3 Qh6 27.Qg4 f5 28.Qe2 Bc5 29.Rd3 d6 30.Bc1 Qg6 31.Be3 Bb4 32.Bd2 Bxd2 |
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Sep-06-20
 | | agb2002: White has the bishop pair for a bishop, a knight and a pawn. Black threatens Nxd3.
Black's knight and bishop are defenseless. Therefore, 20.Bxh7+ Kxh7 (20... Kh8 21.Qh5 wins) 21.Qh5+ Kg8 22.Bxe5, recovering the pawn and weakening the black castle: A) 22... Bd6 23.f4 with the better game but no yet winning. For example, 23... f6 24.Bxd6 Qxd6 25.Rad1 Qe7 26.Rd3 with some edge. B) 22... d6 23.Bf6 (23.Bxg7 Kxg7 24.Qg5+ Kh7 25.f4 f6 and the black queen is ready for the defense) 23... gxf6 (due to Qg5) 24.f4 (24.Rad1 Rfc8 25.Qh6 d5 26.Rd3 Bf8 27.Rg3+ Qxg3 and Black wins) B.1) 24... f5 25.Qg5+ Kh7(8) 26.Rf3 wins.
B.2) 24... Rfc8 25.Qh6, followed by Rf3 and Rg3 or Rh3, wins. B.3) 24... Bd4 25.Qg4+ Kh7(8) 26.Rf3 wins. |
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Sep-06-20
 | | hoodrobin: Not so insane. |
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| Sep-06-20 | | Walter Glattke: Ah, yes, -Bd6 better than -d6, -d6 is the "blunder". |
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| Sep-06-20 | | hdcc: The solution seemed to me to be obvious - I didn't work it all out beforehand, but simply understood what needed to be achieved, and played through the necessary moves. The puzzle strikes me as medium / difficult rather than "Insane", but was nonetheless interesting and instructive. |
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| Sep-06-20 | | Brenin: 19 ... Nxe5 is an astonishingly bad move for a GM to play. The obvious 20 Bxh7+ Kxh7 (Kh8 loses to 21 Qh5) 21 Qh5+ Kg8 21 Bxe5 regains the P, and only 21 ... d6 or Bd6 save the exchange. The latter blunts White's attack but leaves Black with a passive position after 22 Bb2 and 23 Rad1, while the former allows 22 Bf6, with dire consequences after 22 ... gxf6 (forced) 23 f4 (but not 23 Rad1 Rfd8 24 Qh6 d5 25 Rd3 Bf8 26 Rg3+ Qxg3, the last move being impossible after 23 f4). Interesting puzzle, but mid-weekish in difficulty. |
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| Sep-06-20 | | RandomVisitor: After 22...Bd6:
click for larger viewStockfish_20090418_x64_modern:
Found 510 tablebases
NNUE evaluation using nn-308d71810dff.nnue enabled <55/78 2:34:58 +0.25 23.Bb2 f6 24.Rae1 Bb4 25.Re3 Qf4> 26.g3 Qh6 27.Qg4 Rf7 28.Rd1 Bc5 29.Red3 Rd8 30.Kg2 f5 31.Qf4 Qxf4 32.gxf4 a5 |
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| Sep-06-20 | | morfishine: I guess the "insane" move is Black's blunder |
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Sep-06-20
 | | OhioChessFan: Expected 22...Bd6. |
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| Sep-06-20 | | 1stboard: Blacks 19th Nxe5 really bad as opened up whites attack. Looks like blacks best move may have been 19 ... d6 followed opening of d file black doubling rooks on d file. Can someone run through Stockfish and see what it says ? |
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| Sep-06-20 | | mel gibson: I saw the first 3 plies straight away but
according to Stockfish 12
it doesn't lead to much advantage until
Black blunders playing 22...d6.
20.Bxh7+
(20. Bxh7+ (♗d3xh7+ ♔g8xh7 ♕d1-h5+ ♔h7-g8 ♗b2xe5 ♗c5-d6 ♗e5-b2 f7-f6
♖a1-e1 ♗d6-b4 ♖e1-e3 ♕c7-f4 a2-a3 ♗b4-d6 g2-g3 ♕f4-f5 ♕h5xf5 e6xf5 ♖f1-d1
f5-f4 ♖e3-e2 ♗d6-e5 ♗b2xe5 f6xe5 b3-b4 a6-a5 b4xa5 ♖b8-b3 g3-g4 ♖f8-e8
♖d1xd7 e5-e4 ♖e2-e1 e4-e3 a5-a6 ♖b3xa3 a6-a7 ♔g8-h7 f2xe3 f4xe3 ♔h1-g2
e3-e2 ♔g2-f2 ♖e8-e4 ♖e1xe2 ♖e4-f4+ ♔f2-e1 ♖f4xg4 ♖d7-c7 ♖g4xc4 ♖e2-g2
♖c4-c1+ ♔e1-d2 ♖c1-c4 ♖g2xg7+ ♔h7-h6 ♖g7-d7 ♔h6-g5) +0.52/41 282) score for White +0.52 depth 41 |
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| Sep-06-20 | | 1stboard: < mel gibson > Can you run my previous message through stockfish ? Black 19 d6 |
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| Sep-06-20 | | Cheapo by the Dozen: The first few moves are obvious but, per the engine, only give White a mild advantage. The real puzzle move is Bf6, and that is hardly worthy of a Sunday rating. |
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| Sep-06-20 | | RandomVisitor: After 19.Bd3:
click for larger viewStockfish_20090418_x64_modern:
41/57 34:48 +0.24 19...Rfd8 20.Qc2 d6 21.exd6 Bxd6 22.Rae1 Qa5 23.Bc1 Ba3 24.Be3 Bc5 25.Bg5 Rd7 26.Rd1 Qc7 27.g3 h6 28.Bd2 Rbd8 41/55 34:48 +0.25 19...a5 20.Bc2 a4 21.Qe2 d6 22.exd6 Bxd6 23.g3 c5 24.Rfe1 Be7 25.Qf3 axb3 26.axb3 Qb7 27.Qxb7 Rxb7 28.Ra5 Rc8 41/61 34:48 +0.56 19...d6 20.exd6 Bxd6 21.Qh5 Rbd8 22.Rae1 Bb4 23.Rd1 Be7 24.Bc3 c5 25.Qf3 Rd7 26.Bxg6 hxg6 27.Rxd7 Qxd7 28.g3 Rd8 ...and with 19...Nxe5 we eventually arrive at this position:
click for larger viewStockfish_20090418_x64_modern:
Found 510 tablebases
NNUE evaluation using nn-308d71810dff.nnue enabled 59/83 6:41:37 +0.32 23.Bb2 f6 24.Rae1 Bb4 25.Re3 Qf4 26.g3 Qh6 27.Qg4 Rf7 28.Rd1 Bc5 29.Red3 Rd8 30.Kg2 f5 31.Qf3 g5 32.h4 gxh4 |
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| Sep-06-20 | | Predrag3141: The only hard part of today's puzzle was convincing myself that 23 Bf6 was fast enough. In fact it wins by two tempi because the fastest defense, 24 ... f5 (planning ... f6 and ... Rf7), allows mate in 7. The hard puzzle this week was on Thursday: Navara vs J Helbich, 1998. White had four plausible tries on his 23rd move, and none of them were actual wins. That was insane. |
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| Sep-06-20 | | Patriot: 20.Bxh7+ is a very easy decision. I wouldn't spend much time on that during a game. Move 23.? That position deserves some thought but only after reaching it. It's enough to look ahead and see that the bishop can simply be retracted with no issues. |
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| Sep-06-20 | | RandomVisitor: A final look after 19.Bd3:
click for larger viewStockfish_20090418_x64_modern:
51/57 5:40:37 +0.18 19...d6 20.exd6 Bxd6 21.Qh5 Rfd8 22.Bc3 Bb4 23.Bxb4 Rxb4 24.Rad1 Rbb8 25.Qc5 Nf4 26.Bc2 e5 27.Be4 Rxd1 28.Rxd1 Rd8 51/78 5:40:37 +0.23 19...Nxe5 20.Bxh7+ Kxh7 21.Qh5+ Kg8 22.Bxe5 Bd6 at this point 61/86 11:42:16 +0.21 23.Bb2 f6 24.Rae1 Bb4 25.Re3 Qf4 26.g3 Qh6 27.Qe2 Rf7 28.Bc3 Bxc3 29.Rxc3 Qh3 30.Rd1 a5 31.Kg1 Rb7 32.Rd6 Qf5 51/72 5:40:37 +0.26 19...Rfd8 20.Qc2 d6 21.exd6 Bxd6 22.Rad1 a5 23.c5 Be5 24.Ba3 Kh8 25.g3 Ne7 26.Be4 g6 27.h4 Kg7 28.Kg2 h5 |
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| Sep-06-20 | | TheaN: I missed 23.Bf6 so can't claim anything, but 22....Bd6! = defends properly so that puts the sac to question. Still, White doesn't have better on move 20, so fair enough. |
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| Sep-06-20 | | MostlyWatch: This is an old line of play from the 1800's I guess. Horowitz explained it in a book which I can't locate in my house and can't find online, not even a mention. Gone like footprints in the sands of time I guess. Basic features are 1) B castles or will castle kingside 2) W opens up his king's rook for action after similarly castling by f4, Rf3, Rh3 and also Qh5 and the Bxh7 sacrifice to crack open the B castle - in whatever order - (all of which we see here) |
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| Sep-06-20 | | messachess: Clever all the way around and seemingly easy. |
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Later Kibitzing> |
Kibitzing
sac: 23.Bf6