Marina Yuganova vs Anton Demchenko (2007)

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Marina Yuganova vs Anton Demchenko
Moscow Open (2007), Moscow RUS, rd 2, Jan-28
English Opening: Anglo-Indian Defense. Mikenas-Carls Variation (A15) · 0-1

ANALYSIS [x]

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sac: 23...Rxh4	PGN: download \| view \| print	Help: general \| java-troubleshooting

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Sep-06-23		mel gibson: That wasn't hard. Stockfish 16 says: 23. .. Rxh4 (23. .. Rxh4 (Rh5xh4 Qd1-h1 Be5xg3 Rb1-b2 Rh4-h2+ Qh1xh2 Bg3xh2 Rc1-h1 Bh2-f4 Kg2-f1 Qd7-f5 Rb2-c2 c7-c5 Nb4-a2 Bf4-e3 Kf1-e1 Qf5xf2+ Ke1-d1 Be3-g5 Na2-c1 Qf2-e3 Kd1-e1 h6-h5 Ke1-d1 h5-h4 Nc1-a2 h4-h3 Rc2-b2 c5-c4 Kd1-c2 Qe3xe2+ Kc2-b1 Qe2xd3+ Kb1-a1 Qd3xa3 Rh1-b1 d4-d3 Rb1-f1 Re8-a8 Rf1xf7 Qa3xb2+ Ka1xb2 Kg8xf7 Na2-b4) +34.77/40 723) score for Black +34.77 depth 40. However if the text reply 24.gxh4 is followed it's mate in 15. 23. Kg2 Rxh4 24. gxh4 Qg4+ (24. .. Qg4+ (Qd7-g4+ Kg2-f1 Qg4-h3+ Kf1-e1 Be5-f4 e2-e3 d4xe3 Qd1-a4 e3xf2+ Ke1-d1 f2-f1Q+ Kd1-c2 Re8-e2+ Kc2-c3 Bf4-e5+ Kc3-b3 Qh3-e6+ Nb4-d5 Qf1xc1 Qa4-a8+ Kg8-g7 Rb1xc1 Re2-b2+ Kb3-a4 Qe6-d7+ Rc1-c6 Qd7xc6+ Ka4-a5 Qc6-b5+) +M15/81 62) Black wins _ mate in 15.

Sep-06-23		chrisowen: Jam tub its hertz its nak q doggy c lew its Rxh4 abridge lug coffin its dub abe leeway choose Rxh4 edict;

Sep-06-23		Brenin: White's opening strategy is hard to understand, with exchanges on d5 and then d4 handing the centre to her opponent. Just look at the position after 14 ... Nd4. Against a stronger opponent there is sometimes a natural inclination to exchange pieces, in the hope of reaching a drawn endgame, but if those exchanges concede good squares this strategy can backfire.

Sep-06-23		Messiah: Wild!

Sep-06-23		agb2002: Black has a bishop for a knight. Black can weaken White's castle with 23... Rxh4, threatening Qh3+ and mate next (Kf3 Rf4#): A) 24.gxh4 Qg4+ 25.Kf1 (25.Kh1 Qh3+ 26.Kg1 Bh2+ 27.Kh1 Bg3+ 28.Kg1 Qh2+ 29.Kf1 Qxf2#) 25... Qh3+ (25... Bf4 26.e4) 26.Ke1 (26.Kg1 Bh2+ transposes to first subline) 26... Bf4 A.1) 26.e3(4) dxe3 A.1.a) 27.fxe3 Rxe3+ 28.Qe2 (else mate soon) 28... Qh1+ 29.Kd2 Rxe2+ 30.Kxe2 Bxc1 wins decisive material. A.1.b) 27.f3 Qg3+ 28.Kf1(e2) Qf2#. A.1.c) 27.Qe2 Qh1+ 28.Qf1 exf2+ wins decisive material. A.1.d) 27.Rc2 exf2+ 28.Kxf2 Bg3+ 29.Kf3 (29.Kg1 Qh2+ 30.Kf1 Qf2#) 29... Be1+ 30.Kf4 Qf5#. A.2) 26.f3 Qg3+ 27.Kf1 Be3 and mate next. B) 24.f4 Qh3+ 25.Kf2 (25.Kf3 Rxf4#) 25... Bxf4 B.1) 26.gxh4 Qxg3+ 27.Kf1 Be3 and mate next. B.2) 26.gxf4 Rxf4+ 27.Ke1 (27.Kg1 Qg3+ 28.Kh1 Rh4#) 27... Rf1+ wins decisive material. C) 24.e3 Qh3+ 25.Kf3 Bxg3 26.fxg3 Re3+ 27.Kf2 Qxg3+ 28.Kf1 Rf4(h1)#.

Sep-06-23		King.Arthur.Brazil: This is easy for people from CG: The convincing line is: 23...Rxh4 24. Nd5 (or similar) Qh3+ 25. Kg1 Qh1# or 24. Qg1 Qh3+ 25. Kf3 Rf4#. Other case: 24. f4 Qh3+ 25. Kf2 Bxf4 26. gxf4 Qe3+ (27. Kg2 Rg4+ 28. Kf1 Rg1#) 28. Kh2 Qg3+ 29. Kh1 Qh3#. Therefore, W accept the ♖. 24. gxh4. Now, how to win? 24... Qg4+ 25. Kf1 Qh3+ 26. Ke1 Bf4 Doors are closed! Then, 27. e4 (or e3) dxe3 28. fxe3 Qxe3+ 29. Kf1 Qh3+ (30. Kg1 Be3#) 30. Kf2 Bg3+ (31. Kg1 Qh2+ 32. Kf1 Qf2#) 31. Kf3 Bxh4+ 32. Kf4 Bg5#. Also 27. f3 Be3 and Qh1#. Anything like 27. Qb3 Qh1# too. Also, if : 27. e4 (or e3) dxe3 28. Qe2? exf2+ 29. Kxf2 Qh2+ 30. Kf3 Rxe2 and mate next. 29. Kd1? f1=Q+ 30. Qxf1 Qxf1+ 31. Kc2 Re2+ 32. Kc3 Bxc1.

Sep-06-23		King.Arthur.Brazil: I guess my line is better cause it reaches mate. E.g. 27...dxe3 28. f3 Qh1+ 29. Ke2 Qg2+ 30. Ke1 Bg3#. Time for <Brenin> show what 'detail' I forget this time.

Sep-06-23		Jimfromprovidence: Here's a side puzzle. Let's remove black's pawn on d4. So does 23...Rxh4 still win? click for larger view

Sep-06-23		Refused: That white King just asks for it. 23...Rxh4 (threatens Qh3+) 24.gxh4 Qg4+ 25.Kf1 Qh3+ 26.Ke1 Bf4! 27.e3 dxe3 and this looks utterly resignable the point is 28.fxe3 Qxe3+! and this has to be mate.

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