Ludwig Rellstab vs Gosta Stoltz (1930)

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Ludwig Rellstab vs Gosta Stoltz
Swinemuende (1930), Swinemuende GER, rd 7, Jun-28
Indian Game: East Indian Defense (E00) · 1-0

ANALYSIS [x]

FEN COPIED

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Nov-23-10		An Englishman: Good Evening: A fan of retrograde chess might have fun with the final position--how did the Black Bishop end up on g5 without capturing anything?

Sep-20-22		Brenin: 24 Nf6+, and 25 Bxf6 if Black recaptures with P or B, and 25 Nxe8 if he doesn't.

Sep-20-22		monopole2313: A Rellstab in the back.

Sep-20-22		jrredfield: I looked at 24 Nf6+ probably longer than any other move, but was still not totally sure. I also considered 24 Bxg7 and 24 hxg5. Nf6+ wins more quickly but hxg5 also leads to a win, quite convincingly. With Nf6+, Black cannot capture the White Bishop after it captures the Black Bishop on F6 due to the Queen attack. Komodo Dragon shows 24 Nf6+ as a mate in 13 for White. 24.♘f6+ ♗xf6 25.♗xf6 g6 26.fxg6 ♗g4 27.♕f4 fxg6 28.♕h6 ♔f7 29.♗e5+ ♗f3 30.♕g7+ ♔e6 31.♕f6+ ♔d5 32.♕d6+ ♔c4 33.♖c1+ ♔b5 34.♕xb6+ ♔a4 35.♖a1 ♖xe5 36.♖xa2+

Sep-20-22		Honey Blend: 24. hxg5 fxg4 25. f6 is the solid, un-flashy winning alternative. click for larger view

Sep-20-22		perfidious: Embarras de richesse.

Sep-20-22		mayankk06: 24 Nf6+ threatens a Rook fork and therefore has to be captured. A. 24.... gxf6 25 Bxf6 threatens Qxg5+ next and mate or material loss seems unavoidable. For example 25 ... Kf8 26 Qxg5 Rd8 to clear space for King flight loses Rook. B 24... Bxf6 25 Bxf6 g6 26 Qg5 traps the White King in a mating net with no escape. 26... Kf8 27 Qh6+ Kg8 28 Qg7#

Sep-20-22		get Reti: <mayankk06> After 24... Bxf6 25 Bxf6 g6 26 Qg5 black can play 26. Kh7 and hold off mate for the time being, although white is still winning.

Sep-20-22		mel gibson: 24. Nf6+ looked good but I wasn't totally sure. Stockfish 15 says mate in 13: 24. Nf6+ (24. Nf6+ (♘g4-f6+ ♗g5xf6 ♗c3xf6 g7-g6 f5xg6 ♗c8-g4 ♕g3-f4 f7xg6 ♕f4-h6 ♔g8-f7 ♗f6-e5+ ♔f7-e6 ♕h6xg6+ ♔e6-d5 ♕g6-d6+ ♔d5-c4 ♖e1-c1+ ♔c4-b5 ♕d6xb6+ ♔b5-a4 ♖c1-c4+ ♕a2xc4 ♖f1-a1+ ♕c4-a2 ♖a1xa2+) +M13/72 62) White wins _ mate in 13.

Sep-20-22		Cheapo by the Dozen: This was a little hard to calculate to the end as Tuesday puzzles go, but otherwise suitably easy. Capture after 24 Nf6+ is forced, for material reasons if nothing else. And any difficulties finishing off the attack after the knight is captured are no worse than those that could arise if Black were allowed time for ... f6, which Nf6 forestalls.

Sep-20-22		agb2002: White has a bishop and a knight for the bishop pair. Black threatens hxg4 and bxc5. The queen x-rays the black king. This suggests 24.Nf6+: A) 24... Bxf6 25.Bxf6 g6 26.Qg5 wins (26... Bf6 27.Qh6). B) 24... gxf6 25.Bxf6 B.1) 25... Kh7 26.Qxg5 Rg8 27.Qxh5#. B.2) 25... Kf8 26.Qxg5 Re5 27.Qg7+ Ke8 28.c6 and mate in two. C) 24... Kf8 25.Qxg5 wins (25... gxf6 27.Qh6+ Ke7 [27... Kg8 28.Bxf6] 28.Qxf6+ Kf8 [28... Kd7 29.Qd6#] 29.Qh6+ and mate next). D) 24... Kh8 25.Qxg5 and mate in two.

Sep-20-22		saturn2: 24.Nf6 but white can simply play 24.Nh2 because g7 is still weak.

Sep-20-22		Chutzpah: Thanks Honey Blend. I was beginning to doubt my subtle solution.

Sep-20-22		daladno: I saw weakness on g7 and went for Bxg7, which works too but is much slower, without 'looking for a better one'. Meh.

Sep-20-22		TheaN: Black is surely in a world of trouble here regardless as the pieces aren't really doing anything, but White can hasten the process with <24.Nf6+!>. The logical but most fatal option is 24....gxf6 25.Bxf6, where the pin on Bg5 leads to a quick mate for White, 25....Bxf5 26.Qxg5+ Bg6 27.Qh6 #1 doesn't help. Black can prolong it by moving Re8 on move 25 but that's futile otherwise. Surprisingly, declining the sac is just as bad because White threatens the same things. After 25....Kf8 (Kh8 is silly, 26.Qxg5 #2) still 26.Qxg5!, as White is threatening Nh7+ with Qxg7#, and 26....gxf6 27.Bxf6 mate soon. Best on paper is <24....Bxf6 25.Bxf6>, Black's only mate preventing move is <25....g6> but now <26.fxg6 +-> and the Black king side collapses entirely.

Sep-20-22		chrisowen: I hanover its whiff quirk Nf6+ aka its ear anaconda koines a jug bud c excalibur bed yad fey its Nf6+ dub;

Sep-20-22		chrisowen: To Headless horseman :)

Sep-20-22		goodevans: I went with <Honey Blend>'s 24.hxg5 fxg4 25.f6. It's obviously winning and so I didn't bother looking for a slightly faster alternative. SF confirms that <daladno>'s 24.Bxg7 is also winning and that, as <saturn2> says, 24.Nh2 is also good for a win. Black's position is so weak that White can even procrastinate with 24.cxb6 and Black still can't save himself. Have I exhausted all the 24th winning possibilities? I very much doubt it. There are just too many for this to be considered an even half way decent puzzle.

Sep-20-22		jrredfield: <goodevans: Have I exhausted all the 24th winning possibilities? I very much doubt it. There are just too many for this to be considered an even half way decent puzzle.> I've never seen a puzzle like this. I ran Komodo Dragon with multiPV set to 16. All 16 moves win! I didn't choose to analyze all 24 move possibilites since high multiPV settings like this are quite punishing to my laptop. Depth 23 (PVs abbreviated so comment would fit): {+M13 24.Nf6+ Bxf6 25.Bxf6 g6 26.fxg6 Bg4 27.Qf4 Re6 28.gxf7+ Kxf7 29.Bc3+ Ke7 30.Qf7+ Kd8 31.Bf6+ Kc8 32.cxb6 Qc4 33.Rc1 Rxf6 34.Rxc4+ Rc6 +40.93 24.Bxg7 hxg4 25.Qxg4 f6 26.hxg5 Qd5 27.gxf6 Ra7 28.Bh6+ Kh8 +17.66 24.hxg5 Bxf5 25.Nf6+ Kh8 26.Nxh5 Kg8 27.Nf6+ Kf8 28.cxb6 Qb3 +9.47 24.Ra1 Qxa1 25.Rxa1 hxg4 26.hxg5 a5 27.cxb6 Bb7 28.Qxg4 Bd5 +9.24 24.cxb6 hxg4 25.hxg5 Qd5 26.Rd1 Qc6 27.Rd6 Qb5 28.g6 Bxf5 +9.09 24.Rf4 hxg4 25.hxg5 Bxf5 26.Rxf5 Re7 27.Ref1 bxc5 28.R5f4 Rb8 +9.05 24.Rd1 hxg4 25.hxg5 Bxf5 26.Rxf5 Qe6 27.Rdf1 Re7 28.R5f4 Qg6 +8.65 24.c6 hxg4 25.hxg5 Qd5 26.Qxg4 Qxc6 27.Qh3 Qd6 28.Rf4 Bxf5 +8.38 24.Rc1 hxg4 25.hxg5 Qd5 26.Qxg4 Rd8 27.cxb6 Qb3 28.g6 fxg6 +8.16 24.Bf6 Qd5 25.hxg5 Bxf5 26.Rd1 Qb3 27.Nh6+ gxh6 28.Rd6 Bg6 +8.15 24.Rf2 hxg4 25.hxg5 Qd5 26.Qxg4 Qxc5 27.Rf4 Qd6 28.Qh5 Bxf5 +8.02 24.Nh2 Bh6 25.Bxg7 Bxf5 26.Bxh6+ Bg6 27.cxb6 Rac8 28.Rd1 Rc2 +7.90 24.Kh2 hxg4 25.hxg5 Qd5 26.Qxg4 Qxc5 27.Rf4 Bd7 28.Qh3 Rad8 +7.89 24.Kh1 hxg4 25.hxg5 Qd5 26.Qxg4 bxc5 27.Rf4 Ra7 28.Kg1 Re5 +7.83 24.Nf2 Bxf5 25.Qxg5 Bg6 26.Nh3 Qe6 27.Nf4 Qf5 28.Qxf5 Bxf5 +7.82 24.Bd4 hxg4 25.hxg5 Qd5 26.Qxg4 bxc5 27.Bc3 Ra7 28.Rf4 Re5 How could Black have gone so wrong?

Sep-20-22		PawnSac: < An Englishman > somewhere in my library is a whole book of retrograde problems. They were quite interesting and fun

Sep-20-22		sudoplatov: I would have probably played 24.Bxg7 (especially in blitz.) I later analyzed it with Stockfish and got a 16+Pawn advantage. White's position is rather strong.

Jan-09-24		Stolzenberg: This opening is called Queen's Indian (E14). The usual move order is 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3, followed by 4. ... Bb7 5. Bd3 and one has reached the position of this game after <5. Nf3>.

Jan-10-24		Stolzenberg: I cannot see the sense behind <8. .. Qe7>. It looks like a waste of time. Instead 8. ... 0-0 followed by ... c5 and ... Nc6 seems to be the right way.

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