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Manuel Leon Hoyos vs Yu Yangyi
48th World Junior Championship (2009), Puerto Madryn ARG, rd 12, Nov-02
Formation: King's Indian Attack (A07)  ·  0-1



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Kibitzer's Corner
Premium Chessgames Member
  Ron: 28. ... Bxf2! is a sound sacrifice; White could have defended better, but would still be in a losing position
Nov-15-09  WhiteRook48: is 29 Kf1 better?
Premium Chessgames Member
  al wazir: What was wrong with the simple 34...Ne3, threatening mate on c2 and d1?
Mar-09-19  Walter Glattke: On my board I just found 28.-Bxf2+ 29.Kxf2 Qc5+ 30.Kf1 Ng4 31.Qa7 Nxh2+ 32.Ke2 Qxa7 33.Rxa7, but no check because of Bc3.
Mar-09-19  Walter Glattke: In the match, black can play 31.-Qxc4+ 32.Kd1 Qd3+ 33.Bd2 Rb2 34.Qa5 Ne3+ 35.Ke1 Nxg2+ black wins.
Premium Chessgames Member
  al wazir: After 34...Ne3 35. Qa4, black has 35...Qxg2. If now 36. Ra2, then 36...Qf1+ 37. Kd2 Nxc4+ 38. Kc2 Rb1 wins.
Mar-09-19  ChessHigherCat: Exploiting Hoyos (Spanish for holes)
Mar-09-19  RandomVisitor: After 27.Ba5 white can likely draw

click for larger view


<72/86 0.00 27.Ba5> Qa7 28.Qa3 Bxe3 29.Qxe3 Qxe3 30.fxe3 Bxc4 31.Bc7 Rc8 32.Bxd6 Nxd5 33.e4 Ne3 34.Bxe5 Nxg2 35.Kxg2 Bb5 36.Re1 Re8 37.Bf6 Bc6 38.g4 Bxe4+ 39.Kg3 h6 40.h4 Re6 41.g5 hxg5 42.hxg5 Bc6 43.Rd1 Kf8 44.Rd8+ Re8 45.Rd3 Ra8 46.Rd2 Ke8 47.Kf4 Rc8 48.Ke5 Bb5 49.Rb2 Ba4 50.Rb4 Bc6 51.Rd4 Bd7 52.Kf4 Rc6 53.Rd2 Re6 54.Rd3 Re1 55.Kf3 Rh1 56.Rd4 Rh3+ 57.Kf2 Rh2+ 58.Ke3 Rh3+ 59.Kd2 Ra3 60.Rd6 Ra4 61.Kd3 Ra3+ 62.Kd4 Ra4+ 63.Ke5 Ra5+ 64.Kf4 Rf5+ 65.Ke3 Rc5 66.Rd4 Rf5 67.Rd6

Premium Chessgames Member
  whiteshark: Zero points for me today, coz I missed the winning move <31...Rb6!!>. Instead I went for 31...Qxc4+ 32.Kd2 Rb3 33.Rc1 which leads to nowhere...
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White threatens fxe3.

Black can attack the white king and possibly the bishops with 28... Bxf2+ 29.Kxf2 (else drop a pawn) 29... Qc5+:

A) 30.Ke1 Qe3+ 31.Kd1 (31.Kf1 Ng4 and mate in two) 31... Qxc3, with an extra pawn and the threat Rb2, looks winning.

B) 30.Ke2 Ng4

B.1) 31.Kf3 Qf2+ (or 31... Qe3+ 32.Kg4 f5+ 33.Kh3(4) Qh6#) 32.Kxg4 (32.Ke4 Qe3#) 32... Qf5+ 33.Kh4 Qh5#.

B.2) 31.Rc1 Qe3+ 32.Kd1 (32.Kf1 Nxh2# or Qf2#) 32... Nf2+ 33.Kc2 Qd3#.

B.3) 31.Be1 Qe3+ 32.Kd1 Rb2 wins (33.Qa4 Nf2+ 34.Bxf2 Qd2#).

B.4) 31.Kd2 Qf2+ recovers the piece and keeps the attack.

B.5) 31.Kd3 Qe3+ 32.Kc2 Qe2+ looks similar to B.4.

B.6) 31.Qa7 Rb6, probably better than Qxc4+, and Black will resume the attack as sbove.

C) 30.Kf1 Qe3

C.1) 31.Qa7 Rb1+ 32.Rxb1 Qxa7 wins decisive material.

C.2) 31.Be1 Rb2 32.c5 Ng4 wins.

C.3) 31.Qa3 Ng4 and mate next.

D) 30.Kf3 e4+ 31.Ke2 (31.Kf4 Qf2+ and mate in three) 31... Ng4 looks similar to B except in the case of 32.Qa7 when 32... Rb6 loses to 33.Qa8+ and mate in two. However, Black has 32... Qxc4+

D.1) 33.Ke1 Qxc3+ looks winning.

D.2) 33.Kd2 Qd3+ 34.Kc(e)1 Qxc3+ looks winning.

D.3) 33.Kd1 Qd3+ 34.Bd2 Rb2 35.Qa5 Ne3+ 36.Ke1 (36.Kc1 Qc2#) 36... Nxg2+ wins.

Mar-09-19  mel gibson: I wasn't sure if the sacrifice would pay off.

Stockfish 10 says:

28... Bxf2+

(28. .. Bxf2+ (♗e3xf2+ ♔g1-h1 ♘f6-g4
♗g2-h3 ♕c7-d7 ♕a6-a2 ♕d7-f5 ♕a2-e2 h7-h5 ♔h1-g2 ♗f2-c5 ♗h3xg4 h5xg4 ♖a1-f1 ♕f5-h5 ♔g2-h1 ♕h5-h3 ♖f1-c1 f7-f5 ♕e2-c2 ♖b8-b7 ♕c2-g2 ♔g8-h7 ♖c1-d1 ♖b7-b3 ♕g2-c2 ♖b3-b8 ♕c2-g2 ♖b8-b7 ♖d1-c1 ♔h7-g8 ♖c1-d1 ♔g8-f7 ♖d1-c1 ♖b7-b3 ♕g2-c2 ♖b3-a3 ♕c2-b2 ♖a3-a7 ♕b2-g2 ♕h3xg2+ ♔h1xg2 ♖a7-a2+ ♔g2-h1 ♔f7-f6 ♖c1-b1 g6-g5 ♗c3-b4 ♗c5xb4 ♖b1xb4 e5-e4 ♔h1-g1 e4-e3) +5.26/37 )

score for Black +5.26 depth 37.

Notice that White doesn't take the Bishop on f2 as per the game. To do so would be very bad.
Stockfish 10 says:

29. Kxf2 Qc5+

(29. .. Qc5+ (♕c7-c5+ ♔f2-e2
♘f6-g4 ♕a6-a7 ♖b8-b6 ♗c3-d2 ♕c5xc4+ ♔e2-d1 ♕c4-d4 ♗g2-f3 ♖b6-b1+ ♖a1xb1 ♕d4xa7 ♗f3xg4 ♕a7-a4+ ♔d1-c1 ♕a4-c4+ ♔c1-b2 ♕c4xg4 ♖b1-e1 ♕g4-d4+ ♔b2-c2 ♕d4-c4+ ♔c2-d1 ♕c4xd5 ♖e1-e2 f7-f5 ♔d1-c1 ♔g8-g7 ♗d2-c3 ♔g7-f6 ♗c3-b2 ♕d5-d3 ♖e2-e1 ♔f6-e6 ♖e1-d1 ♕d3-e3+ ♖d1-d2 ♔e6-f6 ♔c1-d1 d6-d5 ♖d2-e2 ♕e3-d3+ ♔d1-e1 d5-d4 ♔e1-f2 e5-e4) +8.39/34 58)

score for Black +8.39 depth 34.

Premium Chessgames Member
  Willber G: <al wazir: After 34...Ne3 35. Qa4, black has 35...Qxg2. If now 36. Ra2, then 36...Qf1+ 37. Kd2 Nxc4+ 38. Kc2 Rb1 wins.>

38...Qb1# is quicker. ;)

Premium Chessgames Member
  drollere: the moves up to 31. Qa7 seemed straghtforward, at least to me. but then i diverged with Qxc4+, not appreciating the importance of the dark diagonal for the continuation.

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