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Aleksey Dreev vs Pavel Potapov
World Rapid Championship (2018) (rapid), St Petersburg RUS, rd 8, Dec-27
Dutch Defense: Queen's Knight Variation (A85)  ·  0-1

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White to move.
ANALYSIS [x]
0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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sac: 22...Nxh3+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jul-11-21
Premium Chessgames Member
  fredthebear: 25.exBd5 Nh4 threatens mate, but White saves the day on the long diagonal with 26.dxe6+ Kg8 27.Qc6. See resulting diagram:


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Jul-11-21
Premium Chessgames Member
  fredthebear: In other words, 25.Kf2??
Jul-13-21
Premium Chessgames Member
  Honza Cervenka: 28.Rxd5 was a decisive mistake. After 28.Qxe4 white is safe.
Jul-13-21
Premium Chessgames Member
  fredthebear: In other words, 25.Kf2?, but it's not fatal.

After a fresh look at the position and notes, one can deduct that 24...Qxh3? is a mistake. Black must spare his bishop from capture.

I should clarify that 25.exBd5 would have given White the better of it despite the pressure on his kingside.

25.Kf2? as played gives Black an edge. Improvements can be found thereafter for either color, as <HC> points out. White had more than one opportunity to stave off Black by improving his captures.

Aug-14-23
Premium Chessgames Member
  chrisowen: I wrack jah its z u foe v tom e3+ imbibe aea its oar axiom c jack e3+ bud;
Aug-14-23  agb2002: Black has four pawns for a rook and a knight.

White threatens Rd7+ and Qxe4.

Black can attack the white king starting with 28... e3+ 29.Ke1 (29.Kg1 Qg2#) 29... Qh1+ 30.Ng1 Qxg1+ 31.Ke2 Qf2+:

A) 32.Kd1 e2+

A.1) 33.Kd2 e1=Q+ 34.Kd3 Qfd2+ 35.Kc4 Qxd5#.

A.2) 33.Kc2 e1=Q+

A.2.a) 34.Kd3 transposes to A.1.

A.2.b) 34.Kb1 Qxc1+ 35.Kxc1 Qe3+, followed by exd5, wins decisive material.

A.2.c) 34.Kb3 Qf3+ 35.Kc2 (else loses the rook on d5 with check) 35... Qee2+ 36.Kb1 (36.Rd2 Qfd3+) 36... Qfe4+ 37.Qxe4 Qxe4+ wins decisive material.

B) 32.Kd3 Qd2+ 33.Ke4 (33.Kc4 Qxd5+ 34.Kc3 Qd2+ wins decisive material) 33... exd5+ 34.Ke5 Qxb2+ wins decisive material.

Aug-14-23  agb2002: 35... Qe3+ in my line A.2.b is a mistake (36.Rd2), the obvious 35... exd5 is more than enough.
Aug-14-23  King.Arthur.Brazil: W has an extra material of ♖+♘. B capture 28...exd5? 29. Qb3 could bring chances for W to save. Then, B must proceed the attack: 28...e3+ 29. Ke1 (Kg1 Qg2#), Qh1+ 30. Ng1 (forced) Qxg1+ 31. Ke2 (Qxc1? 32. Rd7+ Kf8 33. Qd1 seems W can escape) 31... Qf2+

A)32. Kd1 e2+ 33. Kc2 e1=Q+ 34. (Rd2?? Qexd2+) Kb1 exd5 35. Rxe1 Qxe1+ 36. Kc2 Qe4+ with an extra ♖, enought to win. B has also: 36... Qe2+ 37. Kc1 Rb8.

B) Same as A), but 34. Kb3 Rb8+ 35. Kc4 Qxc1+ 36. Kd3 Qce3+ 37. Kc4 exd5+ 38. Kxd5 Qff3+ 39. Kc4 Qd4#

C) 32. Kd3 Qd2+ 33. Ke4 exd5+ 34. Ke5 Re8+ (catch the lady ♕, you know... ) 35. Qxe8+ Kxe8

D) 32. Kd3 Qd2+ 33. Kc4 Qxc1+ 34. Kd3 Qd2+ 35. Kc4 Qxd5+ 36. Kc3 Qd4+ or Rb8 or e2 , with easy win.

I didn't find direct mate in some cases, but the extra material is reasonable to win.

Aug-14-23  mel gibson: I wasn't sure as there were so many checks to investigate.

Stockfish 16 says mate in 23:

28. .. e3+

(28. .. e3+ (e4-e3+ Kf2-e1 Qh3-h1+ Ne2-g1 Qh1xg1+ Ke1-e2 Qg1-f2+ Ke2-d1 e6xd5 Qa4-d7+ Kf7-f8 Qd7xd5 e3-e2+ Kd1-c2 e2-e1Q+ Kc2-b1 Ra8-e8 Na5-b3 Qe1-e4+ Qd5xe4 Re8xe4 Nb3xc5 Re4-e2 Nc5-d3 Qf2-d4 Rc1-c3 Nh4-f3 a2-a3 Re2-e1+ Nd3-c1 Qd4-e4+ Kb1-a2 Nf3-d2 Nc1-d3 Re1-b1 f4-f5 Qe4-h1 Nd3-c1 Rb1xc1 Rc3xc1 Qh1xc1 a3-a4 Qc1-c2 f5-f6 Qc2xa4+) +M23/55 1113

Aug-15-23  Brenin: The line 28 ... e3+ 29 Ke1 Qh1+ 30 Ng1 Qxg1+ 31 Ke2 Qf2+ 32 Kd1 (Kd3 Qd2+ is hopeless) e2+ 33 Kc2 e1=Q+ 34 Kb1 exd5 seems fairly obvious, with Black massively ahead in material, even after Rxe1 Qxe1+, and White having no significant counterplay.

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