[Event "Hart House Holidays Open 2014"]
[Site "Hart House, University of Tor"]
[Date "2014.12.21"]
[Round "4"]
[White "Vavrak, Peter"]
[Black "Noritsyn, Nikolay"]
[Result "0-1"]
[ECO "E70"]
[WhiteElo "2506"]
[BlackElo "2602"]
[Annotator "John Upper"]
[SetUp "1"]
[FEN "q3n1k1/5p1p/1r1P2p1/1Np5/r7/3Q1N1P/5PP1/3R2K1 b - - 0 25"]
[PlyCount "17"]
[EventDate "2014.??.??"]
[SourceDate "2014.08.03"]
25... c4 $1 $17 {Attacking the Q and interfering with the defence of the Nb5.}
(25... Nxd6 $5 {A clever tactic, but it actually decreases Black's advantage.}
26. Nxd6 Rd4 27. Nxd4 Rxd6 28. Qc3 (28. Qc4 Rxd4 29. Rxd4 Qa1+ $19) 28... Qd5
29. Qa5 $1 {Black will be a pawn up, but White has better drawing chances than
the game line.}) 26. Qd4 $2 (26. Qd5 $2 Qxd5 27. Rxd5 Nxd6 (27... Nf6 $19 {
also wins, though with all the pawns on one side and two Ns to defend, Black
would have to be careful.}) 28. Nxd6 c3 {will cost White a N to stop the P.}) (
{Black will be better on all lines, but White's most testing continuation is:}
26. Qe3 $1 {Putting the Q on the e-file creates extra tactical threats on the
Ne8.} Rxb5 27. d7 Rb8 $8 28. Qe7 Ra1 $8 (28... Ra7 $2 29. Ne5 $18 {Threat:
Qxf7-f8#.}) (28... Rd8 29. Ne5 $18) 29. Rxa1 $8 Qxa1+ 30. Kh2 Nf6 $8 31. d8=Q+ (31. Ne5 $2 Nxd7 $8 32. Nxd7 Ra8 $1 33. Nf6+ (33. Ne5
Qa7 $19) 33... Kg7 34. Ne8+ Rxe8 $8 35. Qxe8 Qd4 $19 {Black's advanced pawn,
centralized Queen, and safe King make this an easy win.}) 31... Rxd8 32. Qxd8+
Kg7 33. Qc7 Qc1 $1 34. Nd4 $17 {White has some drawing chances.} (34. Ne5 $140
$2 Qf4+ $8 35. Kg1 Ne4 $19 {everything is defended and Black can choose how to
reroute his N.})) 26... Rxb5 27. d7 {A pawn on the 7th that attacks a N has
two promotion threats, and is a very common motif in tactics puzzles... but
Black has seen further.} Qd8 $8 $19 {The critical tactic, and probably what
White missed: occupying the promotion square takes away half the promotion
tactics.} (27... Rb8 $2 {is the only other move that doesn't lose.} 28. Ne5 {
(threatening Ng4)} Nf6 (28... c3 29. Qxc3 {doesn't change much.}) 29. d8=Q+
Rxd8 30. Qxd8+ Qxd8 31. Rxd8+ Kg7 32. Rc8 $11 {e.g.} Ne4 33. Rxc4 Ra1+ 34. Kh2
Nxf2 35. Nxf7 $1 $11) 28. Ne5 (28. dxe8=Q+ Qxe8 {is obviously hopeless for
White.}) 28... Nf6 29. Qd6 (29. Nc6 Qxd7 30. Qxd7 (30. Qxf6 $2 Qxd1+ $19) 30...
Nxd7 31. Rxd7 c3 $19) 29... Rxe5 {Simplest. 29...c3 is also winning.} 30. Qxe5
Ra6 $1 (30... Nxd7 31. Qd4 Qa5 32. Qxd7 Ra1 $19) 31. g4 Re6 32. Qd4 Nxd7 33.
Qxd7 Re1+ $1 0-1
