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Palle Ravn vs Lajos Portisch
"Ravn Maniac" (game of the day Feb-04-2013)
WchT U26 04th (1957), Reykjavik, rd 11, Jul-11
Nimzo-Indian Defense: Huebner Variation. Main Line (E41)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-04-13
Premium Chessgames Member
  Phony Benoni: Apparently, Portisch was guilty of battery without assault.
Feb-04-13  The Last Straw: This ugly stuff has happened to me before. I set up a gun against the opponents king, and am almos ready to start attacking... until my opponent suddenly busts my army. Chess is like this.
Feb-04-13  Abdel Irada: <Phony Benoni: Apparently, Portisch was guilty of battery without assault.>

Q.: Other than water, what do you need to perform ionic electrolysis?

A.: A salt and battery.

Feb-04-13  jovack: it goes from mundane to insane very quickly.. entertaining
Feb-04-13  Abdel Irada: < jovack: it goes from mundane to insane very quickly.. entertaining>

Ambiguous. Are you referring to the game or our conversation?

If the latter, perhaps "inane" would be a better adjective. At least I know *my* part in it is. ;-)

Aug-10-19
Premium Chessgames Member
  OhioChessFan: 40...Rxf2+ looks like an easy draw.
Aug-10-19
Premium Chessgames Member
  Gregor Samsa Mendel: The Computer thinks that white blundered with 39 Rb1 (Qb8+ was winning) and that black could have won with 40..Qh3+.

Games like this one show me just how little I understand chess.

Aug-10-19
Premium Chessgames Member
  OhioChessFan: If Portisch had 10 seconds to make his 40th move, I understand not wanting to risk the complications of Qh3+. But Rxf2+ should have been easy to find.
Dec-03-22  Brenin: 35 Rxb6+ axb6 36 Qxb6+ Kc8 37 Qc6+ Kd8 38 Qxd6+ Ke8 is easy to see, but what comes next? Like Ravn I'd be inclined to play 39 Rb1, since the B protects the R, but the Stockfish analysis given here prefers 39 Qb8+, leading to capture of the P on c5. I have to leave the engines to adjudicate on this one.
Dec-03-22  Mayankk: The extremely strong Rook-Queen-Rook Battery on the h file suggests White needs a desperate move to attack Black before he gets mated himself or has to concede a perpetual. That leaves 35 Rxb6+ as the primary candidate move. 35 ... axb6 36 Qxb6+ Kc8 is pretty much forced since 36... Ka8 loses immediately.

The only question, for me, after this was when to play Rb1. It was basically guess-work, gobble a few free pawns maybe first. I didn't know if it was a forced win at this point.

Dec-03-22  Brenin: After 35 Rxb6+ axb6 36 Qxb6+ Kc8 37 Qc6+ Kd8 38 Qxd6+ Ke8 39 Qb8+ (rather than the apparently losing 39 Rb1 played) White's winning strategy is to pick up the P on c5 with check, then (after a back rank check by the Q) play Qxh8 Qxh8 Rxh3, with R+B+3P for the Q, and then force the passed d-pawn forward.
Dec-03-22  jrredfield: I saw 35 Rxb6+ axb6 36 Qxb6+ Kc8 right away. Then it appears that White has several options so the best line wasn't obvious from there on, but I was satisfied that eventually, White could grab the Black d pawn and advance his d pawn.
Dec-03-22
Premium Chessgames Member
  raymondhow: Like the engine I preferred 39.Qb8+ to the game move, so that counts as an easy Saturday. The key is to eventually force d6+.
Dec-03-22  mel gibson: The first few moves were obvious -
it was just a matter of whether White could sustain the attack?

Stockfish 15 says:

35. Rxb6+

(35. Rxb6+ (♖b1xb6+ a7xb6 ♕a6xb6+ ♔b8-c8 ♕b6-c6+ ♔c8-d8 ♕c6xd6+ ♔d8-e8 ♕d6-b8+ ♔e8-d7 ♕b8-b5+ ♔d7-d6 ♕b5-c6+ ♔d6-e7 ♕c6xc5+ ♔e7-d8 ♕c5-a5+ ♔d8-d7 ♕a5-a4+ ♔d7-d8 ♕a4-a8+ ♔d8-d7 ♕a8-b7+ ♔d7-d6 ♕b7-c6+ ♔d6-e7 d5-d6+ ♔e7-f8 ♕c6-a8+ ♔f8-g7 ♕a8xh8+ ♕h6xh8 ♖h1xh3 ♕h8-e8 ♖h3-d3 ♕e8-d7 c3-c4 ♔g7-f8 c4-c5 ♕d7-a4 ♔g2-f3 ♔f8-e8 c5-c6 ♕a4-c2 c6-c7 ♔e8-d7 ♔f3-g2 ♕c2-c1 ♗e4-b7 ♕c1xc7 d6xc7+ ♔d7xc7 ♗b7-e4 ♔c7-b6 ♖d3-d6+ ♔b6-c5 ♖d6xf6 ♔c5-c4 ♖f6xf7 ♔c4-d4 f5-f6 ♔d4xe4 ♖f7-d7 ♔e4-f4 f6-f7 ♔f4-e4 ♖d7-d6 ♔e4-f4 f7-f8♕+ ♔f4xg4 ♖d6-g6+ ♔g4-h5 ♕f8-h6+) +M37/75 1666)

White wins _ mate in 37.

Dec-03-22  jrredfield: 32 ... Kc7 would have enabled Black to draw. 32 ... Nxc4?? was a daring blunder by Black. Not sure what he was thinking.
Dec-03-22
Premium Chessgames Member
  An Englishman: Good Evening: Saw the main line until move 39 and then varied with 39.Qb8+,Ke7; 40.d6+,Kd7; 41.Qc7+,Ke8; 42.Qe7X. Of course 39...Kd7 improves, but 39.Qb8+,Kd7; 40.Qb7+,Ke8(Kd8!?); 41.Qc8+,Ke7; 42.d6+,Kxd6; 43.Rd1+ looks lethal. But Stockfish's line is better than that.
Dec-03-22  vajeer: 39. Rb1+ is blunder. Black should have won after 39...Rh3+ 40. Kf1 Qh3+

White wins with 39.Qb8+
I tried hard to see a mating pattern there, and there isn't any (too bad for a puzzle :), but white gets a won end game in that line.

Dec-03-22
Premium Chessgames Member
  scormus: Wild!
Yes, along with others I went with the rather obvious line until 39, and also preferring Qb8+. Tempting though Rb1 was, I thought B would then be able to get at least a draw, and that W needed to keep checking and manoeuvre the BK so as to play d6+. Not that I could see how to force it.

Did B miss a draw? I'll ask SF

Dec-03-22
Premium Chessgames Member
  agb2002: White has a bishop for a pawn.

Black threatens Rxh1.

The black king is defenseless. Therefore, 35.Rxb6+ axb6 (35... Ka8 36.Qb7#; 35... Kc7 36.Qxa7+ Kc(d)8 37.Rb8#) 36.Qxb6+ Kc8 (36... Ka8 37.Qa6+ Kb8 38.Rb1+ Kc7 39.Rb7+ Kc(d)8 40.Qa8#) 37.Qc6+ Kd8 (37... Kb8 38.Rb1+ Ka7 39.Qb7#) 38.Qxd6+:

A) 38... Ke8 39.Qb8+ Kd7 (39... Ke7 40.d6+ Kd7 41.Qc7+ Ke8 42.Qc8(e7)#) 40.Qb7+ Kd8 (40... Ke8 41.Qc8+ Ke7 42.d6+ Kxf6 43.Rd1+ and mate in two) 41.Qa8+

A.1) 41... Kc7 42.d6+

A.1.a) 42... Kxd6 43.Qc6+ Ke7 44.Qxc5+ Ke8 (44... Kd7 45.Rd1+ and mate in two) 45.Bc6+ Kd8 46.Rd1+ Kc7(8) 47.Bf3+ Kb8 48.Rb1#.

A.1.b) 42... Kd7 43.Qc6+ Kd8 44.Qc7+ Ke8 45.Qc8(e7)#.

A.1.c) 42... Kb6 43.Rb1#.

A.2) 41... Kd7 42.Qc6+ Kd8 (42... Ke7 43.d6+ and mate in two) 43.d6 Rh2+ (43... Rg3+ 44.Kxg3; 43... Rxh1 44.Qc7+ and mate next) 44.Rxh2 (44.Kg1 Qc1#; 44.Kg3 Qf4#; 44.Kf3 Qf4+ 45.Ke2 Qxf2+ and mate next) 44... Qxh2+ 45.Kf1 Qh3+ 46.Ke2 Qxg4+ 47.Kd2 Qf4+ 48.Kd3 (48.Kc2 Qxf2+ 49.Kb3 c4+ and Qa7) 48... Rh3+ 49.f3 wins.

A.3) 41... Ke7 42.d6+ as in A.1.

B) 38... Kc8 39.Qc6+ Kd8 (39... Kb8 40.Rb1+ Ka7 41.Qb7#) 40.d6 transposes to A.2.

Dec-03-22
Premium Chessgames Member
  agb2002: For some reason I overlooked 44... Qf4+ and mate soon in the 43... Rg3+ 44.Kxg3 subline in my line A.2.

Better luck tomorrow.

Dec-03-22
Premium Chessgames Member
  chrisowen: I buccanears jammy dodger have I paw its Rxb6+ aeschylus vis occult again I ask for a doughnut no dud axiom jack buddy exodus vie its a Rxb6+ fluff!
Dec-03-22
Premium Chessgames Member
  chrisowen: Buckle my watch no?
Dec-03-22  Refused: I went with 35.Rxb6+ axb6 36.Qxb6+ Kc8 37.Qc6+ Kd8 38.Qxd6+ Ke8 (Kc8 39.Qc6+ Kd8 40.d6) 39.Qb8+ directly. I didn't see the benefit of inserting 39.Rb1 tbh, I still fail to see the point of this move.
Dec-03-22
Premium Chessgames Member
  chrisowen: hog eg tal c :)
Dec-03-22  Hercdon: Indeed, this was a wild game! White had it in the bag despite Black having all of its major pieces on the h file. Then White nearly threw the game away. Luckily, black blundered it right back.
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