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Jul1113   Doniez: I saw the first forcing move, 37.Rxg7+' (rook sac) and the consequent move 37...Kxg7. Amos white can start use his dark square Bishop, 38.Bf6+. But I was unable to arrive to the final position. 

Jul1113
  al wazir: I got it, but I would have played 40. Bxe5+. It's more forcing. 

Jul1113
  agb2002: White has the bishop pair for a bishop, a knight and a pawn. Black threatens 37... N(Q)xd7, 37... Rxh4 and 37... Nd3. The black castle is very weak. This suggests 37.Rxg7+ Kxg7 (37... Kh8 38.Qh6#) 38.Bf6+, starting an attack with queen, rook and bishop: A) 38... Kf7 39.Bxe5+
A.1) 39... Ke6(7) 40.Qd6#.
A.2) 39... Kg6 40.Rf6+ Kg(h)7 41.Qh6+ Kg8 42.Qg6+ Kh8 43.Rf8#. A.3) 39... Kg8 40.Qg5+ Kh7 41.Qg7#.
B) 38... Kf8 39.Bxe5+ is similar to A.
C) 38... Kg6(8) 39.Qg5+ Kf7 40.Bxe5+ Ke6 41.Qf6+ and mate next. D) 38... Kh7 39.Qg5
D.1) 39... Qd7 40.Qxh5+ Kg8 41.Qh8+ Kf7 42.Bxe5+ Ke6 (42... Ke7 43.Qf6#) 43.Qf6+ Kd5 44.Rd2+ wins. D.2) 39... Ng6 40.Qxh5+ Kg8 41.Qxg6+ Kf8 42.Qg7#.
D.3) 39... Nf3+ 40.Rxf3 R4e7 (40... Rg4 41.Qxh5+ Kg8 42.hxg4 Bxf3 43.Qg6+ Kf8 44.Qg7#) 41.Qxh5+ Kg8 42.Qg6+ Kf8 43.Bxe7+ Kxe7 44.Rf7+ Kd8 45.Qd6+ Qd7 46.Qxd7#. D.4) 39... Rg8 40.Qxh5#.

Another option is 38.Qg5+, instead of 38.Bf6+:
A) 38... Ng6 39.Rf6
A.1) 39... R4(8)e6 40.Qxg6+ Kh8 41.Qxh5+ Kg8 42.Qg5+ (42.Rf7 Rh6) 42... Kh8 (42... Kh7 43.Rf7+ Kh8 44.Qg7#) 43.Rf7 and mate soon. A.2) 39... Rf8 40.Qxg6+ Kh8 41.Qh6+ Kg8 42.Qg5+ and 43.Rh6#. A.3) 39... R4e7 40.Rxg6+ Kh8 (40... Kf8 41.Qh6+ Rg7 42.Qxg7#) 41.Qh6+ Rh7 42.Bf6#. A.4) 39... R8e7 40.Rxg6+ Kf7 (40... Kf8 41.Rg8+ Kf7 42.Qg6#; 40... Kh8 41.Rh6+ Rh7 42.Qf6#) 41.Rg7+ wins. A.5) 39... Rg4 40.Rxg6+ and mate next.
A.6) 39... Qd7 40.Qxg6+ Kh8 41.Rf7 Qxf7 42.Qxf7 Rxh4 43.Qxe8+, etc. B) 38... Kh8 39.Qxh5+ Kg8 (39... Kg7 40.Bf6+ transposes to previous lines) 40.Qg5+ Kh8 41.Rf6 Re7 42.Rh6+ Rh7 43.Qf6+ Kg8 44.Qg5+ Kh8 repeats moves. 
I think I'd play 38.Bf6+. 

Jul1113
  morfishine: I was unable to see the win all the way through. I spent considerable time on 38.Qg5+ before seeing that 38...Ng6 will hold. And when I moved onto 38.Be5+, I was unable to force the win after 39...Ke6 

Jul1113   stacase: 37 Rxg7+ is a crusher. 

Jul1113   cyclon: Today I start with 37. Rxg7+ which is pretty 'obvious'. ( 37. Rxg7+ ) 37. Kxg7 38. Bf6+  this is the winning move ( 38. Qg5+? blocks the B on h4 for the FLEETING moment, preventing immediate mating attack  the text retains the activity of both, Bishop and the Queen. )  38. Kh7 ( 38. Kf7 39. Bxe5+ / 38. Kf8 39. Qh6+ / 38. Kg8 39. Qg5+/ Kg6 39. Rf6+ all leads to mate in varying move amount ); and here two mainlines as an example: 1. ( 37. Rxg7+ Kxg7 38. Bf6+ Kh7 ) 39. Qg5 Qd7 ( 39. Rg8? 40.Qxh5X ) 40. Qxh5+ Kg8 41. Qh8+ Kf7 42. Bxe5+ Ke6 43. Qf6+ Kd5 44. Rd2+ and it's a curfew. 2. ( 37. Rxg7+ Kxg7 38. Bf6+ Kh7 ) 39. Qg5 Nf3+ ( a nice try, but..., ) 40. Rxf3 R4e7 41.Qxh5+ Kg8 42. Qg6+ ( only so  42. Qh8+?, or 42. Rg3+? ) 42. Kf8 43. Bxe7++ ( doublecheck IS the point here ) 43. Kxe7 44. Rf7+ Kd8 45. Qd6+ and mates next. So, after 37. Rxg7+ and 38. Bf6+ it seems to be cufflinks for White. 

Jul1113
  agb2002: The natural 39.Bxe5+ seems to be quicker than the text 39.Qg5. 

Jul1113   wingpawn: I admit I can't really calculate this to the end from the given position; all I have is some general thoughts. Black has just attacked White Rook on d7 with a Knight. White doesn't want to retreat his most active piece and the enemy King is almost asking for a punch like: 37. ♖xg7+ ♔xg7 otherwise, it's 38. ♕h6 checkmate. 38. ♕g5+ now Black is forced to play 38...♘g6 because if he goes 38...♔h7 39. ♕xh5+ ♔g8 40. ♗f6 the King will be soon dragged to ffile after which White takes Black Knight on e5 with check and has two pawns for exchange plus raging attack. After 38...♘g6 39. ♖f6 Black cannot really protect his Knight from being captured, so White again gets back his material and retains attacking chances as his remaining ♕, ♖, ♗ still occupy great positions. To me, all that is quite enough to justify the first move. <After checking> Hm, looks like 38. ♗f6+ was at least equally good to my suggestion. I didn't have enough nerves to check all those nonforcing Queen moves. 

Jul1113
  cocker: According to Fritz, White should have played 39 Bxe5+. In the game Black could have escaped (& won) with 39 ... Ke6. 

Jul1113   Abdel Irada: The key move almost plays itself because White really *has* no other way to attack. After that, however, some finesse is required, as demonstrated by the various ways Black can escape if White adopts the wrong move order. ∞ 

Jul1113
  gofer: <37 Rxg7+ Kxg7>
<38 Bf6+ ...>
38 ... Kf7/Kf8 39 Bxe5+ mating
38 ... Kg8 39 Qg5+ mating
38 ... Kg6 39 Qg5+ Kf7 40 Bxe5+ Ke6 41 Qf6+ mating
<38 ... Kh7>
<39 Qg5 ...>
click for larger viewI see no hope for black from here.
The king hunt is afoot! One possible variation is...
<39 ... Qd7>
<40 Qxh5+ Kg8>
<41 Qh8+ Kf7>
<42 Be5+ Ke5>
<43 Qf6+ Kd5>
<44 Rd2+ Kc5>
<45 Rxd7 ...>
with mate to follow soon...
~~~
Hmmm, I agree with everyone else. 39 Bxe5+ was the best
response to 38 ... Kf7. 

Jul1113   Tartalacreme: There is obviously a mistake in the game score. Black played 38. ... Kh7 and not Kf7. 

Jul1113
  kevin86: The rook sac opens the position like a surgeon (remember the song by Weird Al?) 

Jul1113
  Jimfromprovidence: The text 39 Qg5?? throws away the win as it allows for 39...Ke6. click for larger view 

Jul1113   nescio: <Jimfromprovidence: The text 39 Qg5?? throws away the win as it allows for 39...Ke6.> Not if <Tartalacreme> is right and black played 38...Kh7 instead of Kf7. 

Jul1113
  pittpanther: I thought 38 Qg5+ also won. Those with a computer engine, can you confirm if that is still winning or not? Many lines transpose by later playing Bf6 but the Q is already up near the king. 

Jul1113
  chrisowen: If he engage rook fed g7 first for am club street,
racing ahead get inch bed red jet engines 37.Rxg7+,
to feel an affable need ay memento e4 and e5 out of, frame were going for autopilot bishop and d2 queen provide angst back off i needs terrific church of reason dictactes have sequence shin fling g7+ teen age kicking 37...kxg7 booby prize for black on g7 allow st trod mack second choice follow up have redeploy radar man screened 38.bf6+ marvel split you include a fab bishop energy yin and yang aka re
ace effected 38...Kf7 l0 win e5+ mate in 5 be cool h7 also me thinks a good 13 move reaching for elements 38...Kh7 39.Qg5 steps up to the plate aint it hog in f3 and angle black knight hint re a dredge off you h5 ban eg for: click for larger viewSuffice nearly done and dusted black looses right incher finding g4 or in c5 gamble it doesnt pay off queen change bed in g4 h5 etc pinafores 39.Qg5 white now in entertain checkmate although black e6 see like at hi efface offking goes to hide away in light is unable can penetrate 39.Qd7 instead here cadence ogle 40.Qxh5+ rich again really all over 40...Kg8 or deem e6 light bishop each knight bank clop e5 cane oomph 40...Kg8 Qh8+ and mate reinstate batch ergo a 41...Kf7 finally bard it took
in 42.Cxe5+ mated am seven good in believe it is down sz against e6 squared? 

Jul1113
  morfishine: <Jimfromprovidence> On your comment: <The text 39 Qg5?? throws away the win as it allows for 39...Ke6> Thats where I was stuck and unable to see this through 

Jul1113   BOSTER: This is the line with 38. Bf6+ <Kf7> 39.Bxe5+
if Ke6(Ke7) 40.Qd6#
if Kg8 40.Qg5 and Qg7#
if Kg6 40.Rf6+ Kh7 41.Qh6+ Kg8 42.Rf8+ Rxf8 43.Qg7#
B.T.W., after 38.Qg5+ Ng6 39.Rf6 I guess white win too 

Jul1113
  James D Flynn: Black is a pawn up and White white square B is hemmed in and his black square B is under attack by the Black R, however his Rs are very active.
37.Rxg7+ Kxg7 38.Qg5+ Ng6(if Kh7 39.Rf6 and Black cannot stop Rh6# only delay it for a move by Ng6 else if Kh8 39.Qh6+ Kg8 40.Bf6 Qd7 41.Qh8+ Kf7 42.Bxe5+ Ke6 43.Qf6+ Kd5 44.Rd2+ Kc5 45.Rxd7 with overwhelming material advantage)39.Qf6+ Kh7 40.Qf7+ Kh6 41.Rf5(threats 42.Bg5# and 42.Rxh5+ followed by Qh7#, there is no answer to both threats) Nxh4(ifR8e7 42.Bg5#) 42.Rxh5#. 

Jul1113
  morfishine: <BOSTER> You are correct that 39.Bxe5 is better than 39.Qg5 

Jul1113
  patcheck: I dont know if this problem is medium but if it is, it means I didnt meet the answer. I dint finish my analysis but here are the lines I checked :
37. Rxg7+ Kxg7 (37.
Kh8 38. Qh6#) 38. Qg5+ with three posibilities : A) 38.
Kh8 B) 38.
Kh7 C) 38.
Ng6 A) 38.
Kh8 ? 39. Qh6+ Kg8 40. Bf6 and black is lost : A1) 40.
Kf8 41. Qg7#
A2) 40.
Re7 41. Qh8+ Kf7 42. Qg7+ (for instance) Ke6 (42.
Ke8 43. Qxe7#) 43. Qxg7+ Kd5 44. Bxe5 (not 44. Rd2 Nd3) and black is lost : A2a) 44.
Rxe5 45. Rd2+ Kc6 46. Qd6#
A2b) 44.
Qc6 45. Rd2 Rd4 46. Rxd4 #
A2c) 44.
Qc5! (pinning the rook and attacking the queen) 45. Qxb7+ (45. Qxc5+ !? Kxc5 46. Bd4+ Rxd4?! 47. cxd4 Kxd4 and the two black passed pawns make the situation complex) 45.
Kxe5 46. Qb8+! with only two options for black : 46.
Ke6 or 46.
Kd5 (46.
Qd6? 47. Rf5+ and the black queen is lost) A2c1) 46.
Ke6 47. Qe8+
A2c1a) 47.
Qe7 47. Qc6+ Ke5 48. Qxe4+ Kxe4 49. Re2+ and wins the queen A2c1b) 47.
K d5 48. Qd7+ and black is lost (48.
Qd6 49. Rd2+ winning the queen / 48.
Ke5 49. Rf5#) A2c2) 46.
Kd5 47. Qd8+ and black is lost (47.
Ke6 48. Qe8+ leads to the variation we just analysed. / 47.
Kc6 48. Qa8+ and wins the rook / 47.
Qd6 48. Rd2+ wins the queen / 47.
Ke5 48. Qg5+ wins the queen). So the following line wins : 37. Rxg7+ Kxg7 38. Qg5+Kh8? 39. Qh6+ Kg8 40. Bf6 Re7 41. Qh8+ Kf7 42. Qg7+ Ke6 43. Qxe7+ Kd5 44. Bxe5 Qc5 ! 45. Qxb7 Kxe5 46. Qb8+ But its not an easy line and probably theres an easier way after 39.
Re7, maybe the simple : 40. Bxe7. A3) 40.
Kf7 41. Bxe5+ Rf4 (41.
Ke7 42. Qd6# / 41.
Kg8 42. Qg7# / 41.
Qf5 42. Rxf5+ Ke7 43. Qd6#) 42. Rxf4+ Ke7 (or Kg7) 43. Qd6# (or Qg7#) A4) 40.
Qd7 (not 40.
Qc7 and for instance : 41. Qh8+ Kf7 42. Qg7+ and wins the queen with a winning position). 41. Qh8+ Kf7 42. Bxd5+ and white wins : A4a) 42.
Kg6 43. Rf6+ Kg5 44. Qh6+ Kh4 45. Rf4+ and black will be mate : A4a1) 45.
Rxf4 46. Qxf4 Ng4 (or Qg4) 47. Bf6#
A4a2) 45.
Kg3 46. Rg4#
A4a3) 45.
Ng4 (or Qg4) 46. Qf6 Kg3 47. Rxg4#+
A4b) 42.
Ke6 43. Qf6+ Kd5 44. Rd2 Kc5 (not 44.
Rd4 45. Rxd4+ Kc5 46. Rxd7) 45. Rxd7 and black cant stop the threat Qd6# A5) 40.
Rg4 41. hxg4 Qxg4 42. Qh8+ Kf7 43. Bxe5+ Bf3 [43.
Ke6 44. Qf6+ Kd5 (44.
Kd7 45. Qd6+ Kc8 46. Qc7#) 45. Qd6+ Ke4 46. Qd4# ] 44. Qf6+ Kd5 (or Kd7) 45. Rxf3 and black is totally lost So the line A) : 37. Rxg7+ Kxg7 38. Qg5+Kh8? (followd by 39. Qh6+ Kg8 40. Bf6) seems to win in all the lines. B) 38.
Kh7 39. Qxh5 (39. Rf6 in not that easy ffor white, for instance : 39.
Re6 40. Qf5+ K g8 41. Rxf5 Nf3+! 42. fxg3 Rxe6) And black has two posibilities : B1) 39.
Kg7 B2) 39.
Kg8
B1) 39.
Kg7 40. Bf6+
B1a) 40.
Kf8 41. Bxe5+ Ke7 (41.
Rf4 or Qf5 loose quickly) 42. Qf7+ Kd8 43. Rd2+ and black is lost B2) 39.
Kg8 40. Bf6 and
I stop my analysis here and will look for the answer 

Jul1113   zooter: I saw 39.Bxe5 and yes I think 38...Kh7 is a better attempt by black to escape 

Jul1113   BOSTER: <morfishine> Thanks. <pittpanther> <I thought 38.Qg5+ also win.> These are couples lines without engine.
38.Qg5+ if Kh7 39.Qxh5+ Kg8 40.Bf6
if Kf8 41.Bxe5+ Ke7 42.Qf7+ Kd8 43. Rd2 with mate.
if 38.Qg5+ Kh7 39.Qxh5+ Kg8 40.Bf6 Nc3+ 41.gxf3 rook moves and Qg6 with mate. 38.Qg5+ Ng6 39.Rf6 R4e6 40.Qxg6+ Kh8 41.Qxh5+ Kg8 42.Qg5+ Kh8 43.Rf7 with mate. 

Jul1113   Alex56171: I would have played 39.Bxe5, but I did not figure out the full analysis. It is #5 (by Fritz).
<zooter>, you are right, 38...Kh7 is the best answer for black, but still is #12 (by Fritz). 


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