Olaf Ulvestad vs Edward Lasker (1947)

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Olaf Ulvestad vs Edward Lasker
48th US Open (1947), Corpus Christi, TX USA, rd 7, Aug-17
Queen's Gambit Accepted: Classical Defense. Rubinstein Variation (D27) · 1-0

ANALYSIS [x]

FEN COPIED

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Jun-30-22		Ultra: Fancy dancing.

Jun-30-22		EasilyConfused: Why did Black resign? I think Kd7 survives the attack

Jun-30-22		perfidious: <EasilyConfused: Why did Black resign? I think Kd7 survives the attack> That is met by 37.Nc5+, which also wins the queen.

Jun-30-22		EasilyConfused: Oops, I see, Kd7 is refuted by Nc5+, winning the Queen

Jun-30-22		EasilyConfused: And leading immediately to forced checkmate

Jun-30-22		Brenin: 28 Qh5 is very tempting, e.g. 28 ... gxf4 29 Qxh6+ Ke8 (Kg8 30 Qh7+ Kf8 31 Qh8 mate) 30 Qh8+ Bf8 31 Ba3 Qc7 32 Qxf8+ Kd7 33 Qxf7+ Kc8 34 Qxc7+ Kxc7 35 Bd6+ Kc8 36 Nxb3 with a clear win. Black has plenty of alternatives, but none look good for him.

Jun-30-22		An Englishman: Good Evening: This puzzle had begun to look unsolvable, but finally remembered the Bishop of b2. Credit to Lasker for playing the best defense.

Jun-30-22		nalinw: Finding the response to 29..... Rh8 with a back rank mate to defend makes this a tough Thursday puzzle - I stopped at 29. Rf6

Jun-30-22		mel gibson: I saw the first ply straight away. It was a difficult puzzle after that with many possible lines. Stockfish 15 says: 28. Qh5 (28. Qh5 (♕e2-h5 ♔f8-e8 ♕h5xh6 ♕d7-c7 ♖f4xf7 ♖d8xd4 ♖f7xe7+ ♕c7xe7 ♗b2xd4 ♕e7-b4 ♗e4-c6+ ♔e8-d8 ♗d4xb6+ ♕b4xb6 ♕h6-f8+ ♔d8-c7 ♕f8-d6+ ♔c7-c8 a4-a5 ♕b6-c7 ♕d6-f8+ ♕c7-d8 ♗c6-b7+ ♔c8-c7 ♕f8xd8+ ♔c7xd8 ♗b7xa6 ♔d8-c7 f2-f3 ♔c7-c6 ♔g1-f2 ♔c6-c5 ♗a6-b7 ♗b3-c2 a5-a6 ♔c5-b6 ♔f2-g3 ♗c2-f5 h2-h3 ♔b6-a7 h3-h4 g5xh4+ ♔g3xh4 ♗f5-b1 ♔h4-g5 ♗b1-f5 g2-g4 ♗f5-d3 ♔g5-f6 ♗d3-f1 g4-g5 ♗f1-c4 ♗b7-e4 ♗c4-e2 g5-g6 ♔a7xa6 g6-g7 ♔a6-b5 g7-g8♕) +13.68/44 1038) score for White +13.68 depth 44.

Jun-30-22		agb2002: Black threatens gxf4. The position of the black king and the defenseless knight suggest 28.Qh5: A) 28... gxf4 29.Qxh6+ Ke8 (29... Kg8 30.Qh7+ Kf8 31.Qh8#) 30.Qh8+ (30.Bc6 Qxc6 31.Nxc6 Rd1#) 30... Bf8 31.Ba3 Qxd4 32.Qxf8+ Kd7 33.Qe7+ Kc8 34.Qb7#. B) 28... Ng8 29.Qxf7#. C) 28... Kg7 29.Rf6 C.1) 29... Bxf6 30.exf6+ Kxf6 (else 31.Qxh6 and mate next) 31.Nf5+ Qd4 (31... e5 32.Qxh6#) 32.Bxd4+ Rxd4 33.Qxh6+ Ke5 34.Nxd4 wins decisive material. C.2) 29... Rh8 30.Rxh6 Rxh6 (30... Qxd4 31.Rh7+ Rxh7 32.Qxh7+ Kf8 33.Qh8#) 31.Nf5+ C.2.a) 31... exf5 32.e6+ C.2.a.i) 32... f6 33.Qf7+ Kh8 34.Bxf6+ (34.exd7 Bxf7) 34... Rxf6 (34... Bxf6 35.Qf8+ Kh7 36.Bxf5+ wins) 35.Qh5+ Kg7 36.exd7 fxe4 37.Qe8 looks winning. C.2.a.ii) 32... Bf6 33.Bxf6+ Rxf6 (33... Kxf6 34.Qxh6+ wins; 33... Kh7 34.Bxf5+ wins) 34.exd7 wins decisive material. C.2.a.iii) 32... Kh7 33.Bxf5+ Kh8 34.Qf7#. C.2.a.iv) 32... Kg8 33.Qf7#. C.2.b) 31... Kf8 32.Qxh6+ Ke8 (32... Kg8 33.Qg7#) 33.Qh8+ Bf8 34.Ng7+ Ke7 (34... Kd8 35.Qxf8+ Kc7 36.Qd6+ wins decisive material) 35.Ba3+ wins. C.2.c) 31... Kg8 32.Nxh6+ wins (32... Kg7 33.Qxf7+ and 34.Qh7#).

Jun-30-22		raymondhow: I got the first two moves, then chose 30.Qxg5+ which the engine claims is over +10 for White. But it likes 30.h4 best, over +16. Seems at least four different moves are decisive for White on move 30.

Jun-30-22		saturn2: I took 29.Rf3 instead of 29.Rf6. It puts pressure on the Bb3 and also Rh3 can follow. Enough for me.

Jun-30-22		Brenin: <raymondhow>: The engine move 30 h4 is (unsurprisingly) rather clever. The main threat is 31 hxg5, hitting the N on h6, which cannot move because it has to defend f7. The move also creates an escape square for White's K, so he doesn't have to worry about back-rank mates. Finally, the obvious response 30 ... gxh4 is answered with 31 Bc1, again hitting that poor N, e.g. 31 ... Bxf6 32 exf6+ Kf8 (Kxf6 and Kg8 lead to a quick death) 33 Bh6+ Ke8 34 Bc6, wnining the Q.

Jun-30-22		ChessHigherCat: Without a board, I saw Qh5 and that 1) black does not have time to play pxR because of Qxh6+ followed by mate and 2) the black K can't run for the hills with Ke8 because white pins the Q wth Bc6. Fortunately I didn't even consider jumping into the lion's mouth with Kg7, at which point it becomes a "Can you outplay Edward Lasker for 97 moves?" puzzle.

Jun-30-22		TheaN: <28.Qh5> puts mounting pressure on the Black king side, the point being 28....gxf4 29.Qxh6+ Ke8 (Kg8 30.Bh7+ #3), and here White has to watch out. In my short analysis I would play 30.Bc6? Qxc6! -+ because of back rank, but 30.Qh8+ Bf8 31.Ba3 +- is somewhat obvious on second glance. Trying to hold with <28....Kg7 29.Rf6!> and now the pressure is too much. Any N move leads to Rxf7+ with mate, 29....Bxf6 30.exf6+ +- as Black can no longer defend the knight and 29....Rh8 removes the rook from the attack; Nxb3, h4 and even Rxh6?! win from here. Half a point at best here because of falling for the trap 28.Qh5 gxf4 29.Qxh6 Ke8 30.Bc6? which is nasty.

Jun-30-22		chrisowen: I lap it whiffs off eulogies Qh5 get doh no axiom jug ear bah its DOA block woody its Qh5 cor;

Jun-30-22		Cellist: After refuting Nxe6+ and Rxf7+, I did find 28.Qh5 and saw that 28. ... gxRf4 would be disastrous for Black. But then I immediately went wrong with 29. Rxf7+ Nxf7 30. Qh7+, expecting to play Bg6 to threaten f7 or Ba3+ (if Black moves the Be7 out of the way), but all of this fails miserably, as f7 can be easily defended.

Jun-30-22		King.Arthur.Brazil: The King (me, naturally) followed with 29. ♖g4 ♘xg4 30. ♕h7+ ♔f8 31. ♕h8# or 9. ♖g4 ♖h8 30. ♖xg5+ ♗xg5 31. ♕xg5+ ♔f8 32. ♗a3+ ♔e8 33. ♗c6 wins the Black ♕. You know, I can't resist to capture one ♕. Maybe, other answer ♕xd4 30. ♖xg5+ ♗xg5 31. ♕xg5+ ♔f8 32. ♗a3+ ♔e8 33. ♕e7# or 32...♕c5 33. ♗xc5+ bxc5 34. ♕xd8+ Either way, the Black ♕ wouldn't escape from me!(lgs). It ins't my move the best?

Jun-30-22		keypusher: Wild game! <Phony Benoni> helped me gain a proper appreciation for Olaf Ulvestad with his US Open collections.

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