A blunder or not?

The Polish Grandmaster Radoslaw Wojtaszek is known for his strong white color. After his loss in round three against Anish Giri in Qatar he wanted to recover as quick as possible with the white pieces. Things did not go so well for him at the beginning of his game against the yesterday's hero D. Vocaturo:

[Event "Qatar Masters Open"]
[Site "?"]
[Date "2015.12.23"]
[Round "4.14"]
[White "Wojtaszek, Radoslaw"]
[Black "Vocaturo, Daniele"]
[Result "1-0"]
[WhiteElo "2723"]
[BlackElo "2597"]
[Annotator "Bojkov, Dejan"]
[PlyCount "75"]
[EventDate "2015.??.??"]
[WhiteClock "0:09:06"]
[BlackClock "0:01:36"]

1. d4 e6 2. c4 Bb4+ {Diagram [#] How to name this opening? Advanced
Bogo-Indian? Or flexible Bogo-Indian?} 3. Bd2 Bxd2+ 4. Qxd2 Nf6 5. Nc3 d5 6. e3
{Wojtaszek wants to develop his knight on e2.} ({Now} 6. Nf3 {will switch
into proper Bogo-Indian and this move was a choice of Mamedyarov and Bacrot
among others.}) 6... O-O 7. cxd5 ({The move} 7. Nf3 {is still possible, for
example} Qe7 8. Qc2 c6 9. Bd3 dxc4 10. Bxc4 Nbd7 11. O-O e5 12. Bb3 exd4 13.
exd4 {and White was better in Riazantsev,A (2646)-Roiz,M (2600) Berlin 2015})
7... exd5 8. Bd3 Nc6 {[%csl Yc8,Yd3][%cal Gc6e7,Gc8f5] Diagram [#] This was
played only once before but seems very, very logical. In the arising Carlsbad
pawn structure Black would love to swap off the light-squared bishops. In
the usual Carlsbad the black queenside knight is already on d7 and in order to
achieve the desired trades the knight has to take the long route via f8-e6-g7
and on the top of this Black has to spend time on Rf8-e8 and g7-g6. Vocaturo
is more clever, he creates the positional threat in just two moves.} 9. Nge2
Ne7 10. Qc2 {Stops Bc8-f5.} g6 $146 {Diagram [#] A novelty. Black consistently
plays for Bc8-f5.} ({The only predecessor saw} 10... b6 11. b4 c6 12. Rb1 Bd7
13. O-O {with slight but long-lasting advantage for White, Vaisser,A (2555)
-Bricard,E (2460) France 1993}) 11. h3 {Agressive play. White wants to prove
that g7-g6 was not perfect and that the kingside is weak as well.} (11. O-O Bf5
{should be fine for Black.}) 11... Bf5 12. g4 Bxd3 13. Qxd3 {"I thought this
position is promising for me" Wojtaszek "but Black's next move is very strong."
} Nc8 $1 {[%csl Ge4][%cal Gc8d6,Gd6c4,Gd6e4,Gf6e4] Diagram [#] The knight is
heading for the optimal d6 square and then it will have the pleasant choice
between the e4 and c4 beauties.} 14. O-O-O Nd6 15. f3 {If White had now the
time to play Ne2-g3 followed by g4-g5 everything would be great, but...} Re8
16. Nf4 {White found nothing better than this move, but it has a flaw.} ({
It transpires that} 16. Ng3 {is too slow due to} b5 $1 {[%csl Re4][%cal Rb5b4]
Diagram [#]} 17. e4 ({Worse is} 17. Nxb5 Nc4 $1 ({Or} 17... Nxb5 18. Qxb5 Rxe3
{in both cases with advantage for Black.})) 17... dxe4 (17... b4 18. Nxd5 Nxd5
19. exd5 Qg5+ $17 {is even stronger.}) 18. fxe4 b4 {with Black's edge
(Wojtaszek)}) ({Black is also doing great after} 16. g5 Nh5 17. Nxd5 Qxg5 {
(Wojtaszek)}) 16... c6 17. h4 Nc4 $1 18. e4 Qd6 $1 {[%cal Rd6b4,Rb4b2,Rd6f4]
Diagram [#] A very nice maneuver, missed by the Polish GM.} 19. e5 Qb4 {
With the double threat of checkmate in one and Nc4xe5! Wojtaszek thought for a
moment that he is lost, but then managed to put himself together and found an
excellent resource.} 20. Qe2 $1 {[%csl Rf4][%cal Ga2a3] Diagram [#]} ({White
also calculated the line} 20. Qc2 Ne3 21. Qd2 Nxd1 22. Kxd1 Nd7 23. h5 {
but came to the conclusion that there is not enough compensation after} c5 ({
Or first} 23... Nb6)) 20... Nxe5 21. a3 {The black queen feels overburdened.}
Qc4 22. g5 $1 {Diagram [#]} Nfd7 (22... Qxe2 23. Ncxe2 {drops a piece.}) 23.
Qc2 $1 {Suddenly, the black knight is in danger.} ({Wojtaszek dismissed} 23.
Qd2 {due to the pretty resource} Nc5 $1 {Diagram [#]} 24. dxc5 Nxf3 $17) ({
He also did not like} 23. Qh2 $5 {for the same reason-} Nc5 {but here he
missed a simple move for White in the line} ({However, Black can play for
compensation with} 23... b5 $5 24. Kb1 (24. dxe5 Nxe5 25. Kb1 a5) 24... a5 {
and nothing is clear at all.}) 24. dxe5 (24. dxc5 Nxf3 25. Qg3 Re3 {is indeed
good for Black (Wojtaszek)}) 24... d4 25. Qe2 $1 {and White wins a piece.})
23... Nxf3 ({The familiar trick} 23... Nc5 {was still there when Black can
save the knight but lose precious time. Wojtaszek planned} 24. Kb1 Ned7 {
and now either} 25. Nfxd5 ({But not} 25. Ncxd5 cxd5 $1) (25. h5 $1 {with
strong attack is also great for White.}) 25... cxd5 26. dxc5 {with advantage
for White.}) ({Black can sacrifice the knight for three pawns in the line}
23... Nf8 24. b3 Qa6 25. dxe5 Qxa3+ 26. Qb2 Qxb2+ 27. Kxb2 Rxe5 {but it is
clear that White has the better chances.}) 24. Qf2 $1 {[%csl Rf3] Diagram [#]
The queen dance is over, the knight is trapped.} Nde5 25. Kb1 (25. dxe5 $2
Qxf4+) 25... Nxd4 $2 {A time-trouble blunder.} ({White expected} 25... Rad8 {
(to stop the knight sacrifice on d5)} 26. dxe5 Nxe5 (26... Qxf4 27. Rd3 {
In both cases White has the upper hand but there is plenty of play ahead.}))
26. Rxd4 Qc5 27. Ncxd5 {The correct idea, but in the wrong move order.} ({Not}
27. h5 Nf3 $1 {(Wojtaszek)}) ({However, the preliminary} 27. Rc1 $1 {and only
after} Qf8 28. Ncxd5 $1 {Diagram [#] was the correct move order.} cxd5 29. Nxd5
) 27... cxd5 28. Rc1 (28. Nxd5 Nf3 $1 {is again good for Black.}) 28... Qf8 $2
{Now the attack is unstoppable.} ({Correct was} 28... Qb5 $1 29. a4 (29. Nxd5
$2 Nd3 $1) 29... Qa6 30. Nxd5 Nd3 31. Nf6+ Kh8 {when nothing is clear. Most
likely the players should split the point after something like} 32. Qf3 Nxc1
33. Nxe8 Rxe8 34. Qxf7 Qe2 35. Kxc1 Qe1+ 36. Kc2 Rc8+ 37. Rc4 Qe2+ 38. Kb3 Qd3+
39. Rc3 Qd1+ 40. Ka2 Qxa4+ 41. Ra3 Qc4+ 42. Qxc4 Rxc4 43. Rxa7 Rxh4 44. Rxb7
Ra4+ 45. Kb3 Ra5 46. Rb8+ $11 {Diagram [#]}) 29. Nxd5 {Once that the knight
occupies f6 outpost, the "h" pawn will rush in and open the file for the heavy
pieces.} Rec8 30. Re1 Nc6 31. Rde4 (31. Nf6+ Kh8 32. Rd7 $18) 31... Rd8 32.
Nf6+ {[%csl Gf6,Yg8,Rh7][%cal Rh1h7] Diagram [#]} Kh8 33. h5 gxh5 34. Rh1 Rd6
35. Rxh5 Rxf6 36. gxf6 (36. Qxf6+ Qg7 37. Reh4 $18) 36... Qd6 37. Rxh7+ $1 Kxh7
38. Qf5+ {[%csl Rh7] Diagram [#] Black resigned as it is mate in three.} (38.
Qf5+ Kh8 39. Rh4+ Kg8 40. Qg4+ Kf8 41. Rh8#) 1-0

Report.

Activity in the Endgame

I teach my students three easy steps to evaluate and play endgames.
1) Activity of pieces.
2) Activity of kings.
3) Pawn structure.
Pieces are priority as they have the power and can compensate for material deficit.
Have a look now how Vladimir Kramnik (not my student;) used the force to save himself in his round three encounter against the Italian GM Daniele Vocaturo in Doha:

[Event "Qatar Masters Open"]
[Site "?"]
[Date "2015.12.22"]
[Round "3.6"]
[White "Vocaturo, Daniele"]
[Black "Kramnik, Vladimir"]
[Result "1/2-1/2"]
[WhiteElo "2597"]
[BlackElo "2796"]
[Annotator "Bojkov, Dejan"]
[PlyCount "101"]
[EventDate "2015.??.??"]
[WhiteClock "0:04:30"]
[BlackClock "0:05:23"]

1. e4 e5 {It seems as Kramnik had given up the Pirc for good. Against the
talanted and sharp Vocaturo he wants to play it save.} 2. Nf3 Nc6 3. Bc4 {
Diagram [#] What else would you expect from Italian GM?!} Bc5 4. c3 Nf6 5. d3
d6 6. Bb3 a6 7. O-O h6 {Black often retreats the dark-squared bishop early in
the game, but Kramnik is not afraid of the d3-d4 advance.} 8. Nbd2 {Black has
no problems at all after} (8. d4 Ba7 9. dxe5 Nxe5 10. Nxe5 dxe5 11. Qxd8+ Kxd8
12. Nd2 (12. Bxf7 Rf8 $1) 12... Ke7 13. h3 Be6 {Bisby,D (2288)-Jones,G (2644)
England 2013}) 8... O-O 9. Re1 Be6 10. Bxe6 {An ultra-solid aproach by White
too.} ({Roughly two months ago Ivanchuk preferred to swap the bishops off on
b3, but got nothing out of the opening after} 10. Nf1 Bxb3 11. Qxb3 Re8 12. Be3
Bxe3 13. Nxe3 Qd7 14. h3 Ne7 15. Nh2 c6 16. Rad1 d5 {Ivanchuk,V (2726)-Kramnik,
V (2777) Skopje 2015}) 10... fxe6 11. b4 Ba7 12. Nf1 $146 {Diagram [#] A
novelty which does not change the evaluation of the position-it is equal. The
predecessor saw a quick draw after} ({Predecessor:} 12. a4 Qd7 13. Nb3 Rf7 14.
b5 Ne7 15. bxa6 bxa6 16. d4 Nc6 17. h3 Rb8 {1/2-1/2 (17) Bok,B (2587)-Vishnu,P
(2477) Moscow 2015}) 12... Qe8 {Black's plan is easy- Nf6-h5-f4 or
Nc6-e7-g6-f4 and attack along the half-open"f" file. If White is not careful,
he may easily get into big trouble. Fortunately, A. Karpov is here to help.
The former world champion demonstrated the optimal set-up on the kingside
which every "Italian" player knows.} 13. a4 Ne7 {[%cal Ge7g6,Gg6f4,Yf6h5,Yh5f4]
Diagram [#]} ({Also good is} 13... Nh5 14. Be3 Nf4 ({As if} 14... Bxe3 15. fxe3
{takes away the f4 square from the black knight.})) 14. Be3 Bxe3 15. Nxe3 ({
Here} 15. fxe3 {is also possible but Vocaturo is more ambitious.}) 15... Ng6
16. Ra2 {[%csl Yf2][%cal Ga2d2,Gd3d4,Yd2f2] Diagram [#] To shift the rook in
the center. White could have already started Karpov's set up with.} (16. g3)
16... Rd8 17. Rd2 Qf7 {White's reply would be the same no matter what.} (17...
Nh5 18. Kh1) (17... Nf4 18. Kh1) 18. Kh1 {[%cal Gf3g1,Gf2f3,Gg2g3] Diagram [#]
The king steps away to free the g1 square for the knight. Then once that it
goes back White can repel the active black knights with f2-f3 and g2-g3. This
is what Anatoly Yevgyenievich did against Artur Jussupow in 1986.} b5 {Kramnik
plays all over the board.} (18... Nf4 19. Ng1) 19. Qc2 Nf4 20. axb5 {White
opens the file only to abandon it.} (20. c4 $5 {makes more sense to me.}) 20...
axb5 21. Ng1 (21. Ra1 Ra8 $11 (21... Qh5)) 21... d5 {Now the more experienced
player enjoys some initiative. Still, the game did not leave the boarders of
equality.} 22. f3 ({Or} 22. g3 Ng6 23. f3 $11) 22... Qd7 {Keeps the tension
and creates an obvious threat of capturing on e4.} ({Black could have taken
the open file too} 22... Ra8) 23. Nf1 $1 {[%csl Rd5,Ye5][%cal Re4d5,Ge1e5]
Diagram [#] A nice maneuver which forces Kramnik to clarify his intentions in
the center. Vocaturo threatens to capture on d5.} d4 {This was Kramnik's
general idea. The pawn will separate the b4 trooper form the remaining forces.}
(23... dxe4 24. dxe4 $11) 24. g3 {Better than both} (24. cxd4 Qxd4) (24. Rc1 $6
dxc3 25. Qxc3 Nxd3 {when the black knight is too active on f4.}) 24... Ng6 25.
Rc1 $1 {Vocaturo plays with great precision.} Ra8 $6 {[%csl Yb5,Yc7] Diagram
[#] This leads to difficulties for Black. It was time for Kramnik to think
about equality with} (25... Ne7 26. cxd4 Qxd4 {when} 27. Qxc7 $2 {drops
material to} Rc8) 26. cxd4 Qxd4 ({Or else Black's pawn structure will be
horrific-} 26... exd4 $2 27. f4) 27. Qc5 $1 {One more precise move and White
proves that he has the better pawn structure.} (27. Qxc7 Qxb4 {should be OK
for Black.}) 27... Qxc5 (27... Rfb8 28. Qxd4 exd4 29. Rxc7 $16) 28. Rxc5 Rfb8
29. Rxc7 Ra4 30. Rb2 Ra3 31. Nd2 Rxd3 32. Nb3 {[%csl Yb5,Ye5,Ye6,Rf6,Rg6][%cal
Gc7h7,Gc7a7,Rb3c5,Rc5e6] Diagram [#] The forced play is over and White enjoys
serious advantage thanks to his more active pieces.} Nf8 33. Nc5 Rd1 34. Re7
Re8 {An inaccuracy which could have costed Kramnik dearly. The immediate
activation of the rook was mandatory} (34... Ra8 35. Kg2 Ne8 $1 ({Better than}
35... N6d7 36. Nxe6 Nxe6 37. Rxe6 Rd3 $16) 36. Nxe6 Nxe6 37. Rxe6 Nd6 {[%cal
Gd6c4] Diagram [#] with serious chances to survive.}) 35. Rb7 Ra8 $1 {Better
late than never. The former world champion is too good to stay passive and
wait.} 36. Kg2 g5 {Activity is the slogan for Black's survival.} ({It is too
late for} 36... Ne8 37. Rxb5 Nd6 38. Ra5 $16) 37. Rxb5 Rad8 ({Or} 37... g4 38.
fxg4 Nxg4 39. Nf3 {and White is close to winning.}) 38. Nb3 ({My bet is that
Kramnik would have chosen the solid} 38. Nh3 $5 R8d2+ (38... g4 39. Nf2) 39.
Rxd2 Rxd2+ 40. Nf2 {if he had had the white pieces here.}) 38... g4 $1 {
The best practical chance, or else White will consolidate (both positionally
and on the clock!)} 39. Rxe5 Ng6 40. Rxe6 Kf7 {[%csl Gb4,Ge4,Gf3] Diagram [#]
Black is three pawns down but is ready to show his knights.} 41. Nc5 ({Perhaps
White needed to swap offf a pair of rooks to relieve the pressure} 41. Rc6 Ne5
42. Rc1 (42. Rc7+ Kg6 43. Rc1) 42... Rxc1 43. Nxc1 Nc4 44. Rb3 gxf3+ 45. Nxf3
Nxe4 46. b5 ({Or} 46. Ne2 {in both cases White should be winning.})) 41... h5
42. e5 $2 {Only this move can be definitely claimed a mistake. Why give these
knights squares?} (42. f4 R1d2+ 43. Rxd2 Rxd2+ 44. Kf1 {looked way easier.})
42... Nd5 {[%csl Re6,Rg2][%cal Rg6f4,Rd5f4] Diagram [#] All of a sudden
Kramnik has a threat.} 43. Kf2 ({Say} 43. b5 $2 {and there it comes} Ndf4+ 44.
gxf4 Nxf4+ 45. Kf2 Nxe6 $17) ({White will be very happy to activate his rook,
however} 43. Ra2 {is met by} Rb8 $1 ({But not} 43... Nxb4 $2 44. Ra7+) (43...
Ndf4+ $2 44. gxf4 Nxf4+ 45. Kf2 Nxe6 46. Ra7+ $18)) ({Finally,} 43. fxg4 {
leads to another draw after} Ndf4+ 44. gxf4 Nxf4+ 45. Kf2 Nxe6 46. gxh5 $11)
43... Ra8 $1 {[%csl Rf2,Rg1][%cal Ga8a1,Rd1f1,Rf1g1,Ra1g1] Diagram [#] All the
black pieces are active, he is save now.} 44. Ra6 ({A bit better was} 44. fxg4
hxg4 45. Ra6 Rxa6 46. Nxa6 Nxe5 {but should be also a draw.}) (44. b5 Raa1 45.
b6 Rxg1 46. b7 Raf1+ 47. Ke2 Rg2+ 48. Kxf1 Rxb2 {and Black is better.}) 44...
Rxa6 45. Nxa6 Nxe5 46. Nc5 {The alternatives leave no winning chances to White
neither} (46. Rb3 Rd2+) (46. Rc2 Rb1 $11) 46... Nc4 47. Re2 Nce3 {Diagram [#]
The mating threat forces either perpetual} 48. Re1 ({Or all the material will
disappear after} 48. Rxe3 Nxe3 49. Kxe3 Rxg1 50. fxg4 hxg4 51. Kf4 Rg2 $11)
48... Rd2+ 49. Re2 Rd1 50. Re1 Rd2+ 51. Re2 1/2-1/2