| Nov-10-22 | | Brenin: After more than ten minutes failing to find a forceful move, I gave up and settled for 19 ... 0-0, on the grounds that taking the N on d7 would be foolish for White, since his Q needs to stay on f5 to prevent Rc2+. To my surprise, I seem have solved this one, though I can't take much credit. |
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| Nov-10-22 | | Honey Blend: 19. ... 0-0 makes sense since 20. ♗xd7 ♖c7 recovers the piece, otherwise if White hangs on to his material 21. ♗b5 ♗e4 22. ♕h3 ♖c2+ 23. ♗e2 ♗c5 leaves his King in quite an uncomfortable position:
click for larger viewThree pins, none of which are safety pins. |
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| Nov-10-22 | | Mayankk: Both kings are trapped in centre. Black King is particularly weak with the Bxd7+ Qxd7, Qxd7+ option readily available to quash any attacking threats Black may have. The Black Queen seems central to its attacking plans, and exchanging it off means a largely dull game for Black. After trying out a few tricks like Rc2+, Bg3+, Qxe3+ etc, none of which led anywhere, I thought I will just let go of the troubled d7 Knight by 19... O-O. I of course didn't know if casting is available since the King may have moved twice but there was no other option. After 19 ... O-O, 20 Bxd7 (Qxd7 seems worse due to the threat of 20 ... Rc2+) , there are plenty of possible options. The most obvious one is 20 ... g6 since White Queen can't guard both the d7 Bishop and the c2 square. After this Black is likely to achieve material equality as either the e3 Bishop or d7 Bishop will fall. And with a safe King and a raging attack, hopefully a win is not too far off. |
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| Nov-10-22 | | mel gibson: I thought of castling but then changed my mind when I saw that Black would lose the Knight on d7. I then thought 19... Kd8 to unpin the King and protect the Knight but that loses according to SF. Surely this is a Sunday level puzzle?
Stockfish 15 says:
19... O-O
(19... O-O (O-O ♕f5xd7 ♕e7-e4 ♕d7-h3 ♖c8-c2+ ♘f3-d2 ♗d6-c5 ♖h1-d1 ♗c5xe3+
♕h3xe3 ♕e4-g2+ ♔f2-e1 ♗b7-c6 ♖a1-a3 ♖f8-e8 ♕e3xe8+ ♗c6xe8 ♗b5xe8 ♕g2-h1+
♔e1-e2 ♕h1xh4 ♖a3-f3 ♕h4-e4+ ♖f3-e3 ♕e4-g4+ ♖e3-f3 ♕g4-g2+ ♔e2-e3 ♕g2xg5+
♔e3-e2 f7-f5 ♗e8-b5 ♖c2xb2 ♗b5-c4+ ♔g8-h8 ♗c4-d5 ♕g5-g4 ♖d1-f1 g7-g6 ♔e2-d3
♔h8-g7 ♘d2-c4 ♖b2-b8 ♖f3-f4 ♕g4-g3+ ♘c4-e3 ♖b8-e8 ♖f1-f3 ♕g3-e1 ♖f4-d4
h7-h5 ♖f3-h3 ♖e8-e7 ♖h3-f3 ♕e1-b1+ ♔d3-e2 ♕b1-c2+ ♔e2-f1 ♕c2-b2 ♖d4-d3
♕b2-a1+ ♔f1-g2 ♕a1xa4 ♔g2-h3 ♕a4-b4 ♖f3-f1 f5-f4 ♘e3-g2 g6-g5 ♔h3-h2 ♖e7-d7
♖f1-d1 ♕b4-c5 ♖d3-d4 a7-a5 ♖d1-d3 a5-a4 ♖d4-c4 ♕c5-d6 ♖c4xa4) +5.11/49
623)
score for Black +5.11 depth 49. |
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| Nov-10-22 | | boringplayer: I followed Brenin's thought on this: Black gets way too much compensation for the knight on d7. So just castle. But that's as far as I got. |
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| Nov-10-22 | | jrredfield: I looked at the castling move mainly since I was puzzled that Black hadn't castled yet and it looked like a good time to do so. But I didn't see any convincing variations after that to seal the victory so I concede defeat. I saw with some analysis that any other move besides 19 ... O-O leads only to a draw at best. |
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Nov-10-22
 | | scormus: Difficult!
I couldn't see anything immediately convincing either, and went through the same thought processes as several others. 19 ... O-O looked like the only move but I didn't see how to convert it to clear advantage.
Nothing for me today, Should try harder. |
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| Nov-10-22 | | TheaN: Weird choice for a Thursday. Puzzles like this really make me wonder what the difficulty criteria is: a very open position with many options, where a defensive move turns out to be winning is usually weekend stuff. Having said that, interesting position. I foolishly swapped the moves, which is enough for an even position. I did so because, as others stated, I was getting frustrated not finding a more forcing move: I looked at both castling and g6 and went with the latter as "I can always castle later and the king in the center isn't an issue". That's a wrong assessment. After <19....g6 20.Qxd7+<>> indeed if White retreats Black castles and we transpose <20....Qxd7 21.Bxd7+ Kxd7<>>. This was the position I envisioned as being okay to good for Black:
click for larger view
Sadly, White has a way out because the dark squared bishop is in a bit of a pinch: <22.Rhd1 Rc2+ 23.Rd2<>> and due to the doubled rooks threat, <23....Rxd2 24.Nxd2 Rc8 25.Bxa7 Rc2 26.Ke3 Rxb2 =<>> is pretty much forced:
click for larger view
Black saved himself, but the bishop pair alone vs the passed a-pawn is not enough for a win. Instead, <19....O-O!> keeps the g6 threat alive at the 'cost' of the knight. However, White can't take the knight: <20.Bxd7 (Qxd7 Rc2+ -+) g6 21.Qh3 Rc2+> the point, breaking into the white position <22.Nd2 (Bd2 Bc5+ -+ and meltdown) Bxh1 23.Rxh1 Rd8! -+>:
click for larger view
And White will lose a piece, because retreating Bd7 will allow Black to play Bc5, rendering the entire White camp paralyzed, and else Bd7 is lost. Got the idea, wrong execution, for a weird puzzle. |
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| Nov-10-22 | | Chessius the Messius: I like this one. 19... O-O 20. Bxd7 g6 and White is in trouble: there's no good square for their Q and Rc2+ is coming, or 19... 0-0 20. Qxd7 Rc2+ I'd say deflection of Qf5 is the main theme here. Rc2+ is devastating, that's the idea. Logical thinking and pattern recognition. |
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Nov-10-22
 | | chrisowen: I gap now it's quart booked it's 0-0 fob anaconda jack v cc axioms ejects afford it's pad accords mob about it's lo at 0-0 fab; |
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| Nov-10-22 | | agb2002: The first idea that comes to mind is 19... 0-0, assuming this is legal, to prepare an attack against the white king: A) 20.Qxd7 Rc2+
A.1) 21.Nd2 Qe4 22.Qh3 (22.Qxd6 Qf3+ 23.Ke(g)1 Qxe3+ is winning) 22... Bc5 23.Rhe1 Rxd2+ must be winning. A.2) 21.Bd2 Rxd2+ 22.Nxd2 Bc5+ 23.Kf1 (23.Kg3 Qe3+ 24.Kh2 [24.Kg4 Bc8] 24... Qf2+ 25.Kh3 Qg2#) 23... Qe3 24.Qf5 Bxh1 should be winning. B) 20.Bxd7 g6
B.1) 21.Qh3 (to x-ray e3) 21... Rc2+ 22.Nd2 (22.Bd2 Bxf3 looks very good for Black) 22... Bxh1, followed by Bc5, looks good for Black. B.2) 21.Bxc8 gxf5 22.Bxf5 Bxf3 23.Kxf3 Qb2+ 24.Be4 Qxb2 should be winning. |
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Kibitzing
sac: 19...O-O
