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May2809   sfm:  which I could have avoided by seeing the little "CC" first. 

May2809
  SamAtoms1980: 21 ... Rxg2 22 Kxg2 Bh3+ is the Doomhammer.
Is this Easy Week? 

May2809   harish22: what about this possible continuations
21 .. Rg2+
22 Kg2 Qh3+
23 Kh1 f3 (threatening mate)
Now If
24 Bf3 Then 24.. Qf3+ mates after 25. Bh3
If
24 Rg1 Then 24. fe2 still threatens Qf3 or queening. 

May2809   Confuse: Thanks everyone for the comments. Often this happens in the real games for me... I see a strong continuation, but am unable to deliver the killing blow, getting lost in all the variations... I think reviewing these kind of positions will help me to improve. Cheers! 

May2809   OrangeBishop: After 21. ... Rxg2 22.Kxg2 Bh3+ 23. Kh1 Rg8 White might also try something like 24. Rd1 with the idea of making space for the king on f1 in anticipation of Black's Bg2+ followed by Bf3+. I think this is met by 24. ... Qxf2, threatening Bg2#. A lot of things for White to try, none of which work out. But there's more to it than even Rxg2 followed by Bh3+. 

May2809
  David2009: I saw 21.. Rxg2 22 Kxg2 f3+ with (a) 23 Bxf3 Qh3+ 24 Kg1 Qxf3 or (b) 23 Kh1 fxe2. I looked up the position and was surprised to find that White had resigned immediately. Having now read the other comments I agree that Qh3+ first followed by f3 is more accurate. (b) wins but is messier. 

May2809   stacase: I would have looked at 21 Rxg2 over the board for a long time since it threatens mate. I can't say that I see the rest all the way to a win for Black. 

May2809
  agb2002: The white king is defenseless after 21... Rxg2 22.Kxg2 Bh3+: A) 23.Kh1 Rg8
A.1) 24.Rg1 Rxg1+ 25.Kxg1 Qg5+ and mate in two.
A.2) 24.Qd1 Bg2+ 25.Kg1 Bf3#.
A.3) 24.Bf3 Bxf1  +. For example, 25.Qd1 Qh3 26.Ra1 Bg2+ 27.Kg1 (27.Bxg2 Qxg2#) Bxf3#. A.4) 24.Re(d,c,b,a)1 Qg5 25.Bf3 Bg2+ 26.Kg1 (26.Bxg2 Qxg2#) Bf3+ 27.Kf1 Qg1#. A.5) 24.f3 Bg2+ 25.Kg1 Bxf3#.
B) 23.Kf3 Qg4#
C) 23.Kg1 Qg5+ mates in two. 

May2809   gofer: Okay so I have probably missed something, but it all looks pretty forced after 21 ... Rxg2
21 ... Rxg2
22 Kxg2
22 ... Qh3+
forces mate (or a win) eventually but there are lots of alternatives, so I think that 22 ... Bh3+ is cleaner and quicker
Option 1 for black
23 Kg1 Qg5+
24 Kh1 Qg2#
Option 2 for black
23 Kh1 Rg8
Now black has a couple of alternatives but all of them loose 24 Qd1 (or f3) Bg2+
25 Kg1 Bf3#
24 Rg1 Rxg1+
25 Kxg1 Qg5+ mating
24 Bf3 Qg5 with Bg2+ next mating
24 Bg4 f3 (keeping the white king pinned in the corner) 25 Rg1 Rxg4
26 Rg3 Bg2+
27 Kg1 Qxh2+!
28 Kxh2 Rh4+ mating 

May2809   Murtazaali: easy one .... 

May2809   blacksburg: that wasn't so hard. 

May2809   gofer: As I wrote before I decided against Qh3+ as the following continuation takes to move 28 to get the mate... 21 ... Rxg2
22 Kxg2 Qh3+
23 Kh1 f3
24 Rg1 fxe2
25 Qb1 Qf3+
26 Rg2 Bh3
27 Qg1 Bxg2+
28 Qxg2 e1=Q#
and if black chooses anything other than 24 ... fxe2 then things become quite difficult for black, where as 22 ... Bh3+ leaves white no room to move... ...but I suppose its still just personal choice!
:) 

May2809   Babar47: I went for 21..Bh3 , which is also winning. , but no quick forced mate. 

May2809   Samagonka: This was the easiest Thursday for me. I got it without much thought. 

May2809   vaskokibika: 21...Rg2 is obvious. The problem was to find correct continuation.
I select 22...f3+
For example: 23.Bxf3 Qh3 24.Kg1 Bg4 25.Bg2 Bf3
click for larger viewOr 23.Kh1 Qg4 24.Rg1 f3xe2 25.Rxg4 e1Q+ 26.Rg1 Qe4+ and Bh3, Rg8 and won pawn ending
click for larger view 

May2809   SamuelS: I got 21...Rxg2 22. Kxg2 (otherwise 22...Qxh2#) Qh3+ 23. Kh1 (23. Kg1 Bd7 (24. Kh1 f3 leads to the main variation) 24. f3 Rg8+ 25. Kf2 Qh4# (25. Kh1 Qg2#)) f3 24. Rg1 (24. Bxf3 Qxf3+ 25. Kg1 Bh3 and 26. Qh3# or Rg8#) fxe2 25. Re1 Qf3+ 26. Kg1 Bh3 and Qg2# (25. Rxe2 Qf3+ 26. Rg2 Bh3 and 27. Qxg2# or 25. Rg2 e1Q+ 26. Rg1 Qf3#). Is there something wrong with this? 

May2809   backyard pawn: Today's puzzle is pretty challenging to follow the lines to the end. Here's what I like: 21..., Rxg2
22. Kxg2 (forced), Bh3+ (helps to bring Black's rook into play)
23. Kh1 (forced), Rg8:
Now there are choices:
24. Rg1, Rxg1+
25. Kxg1 (forced), Qg5+
26. Kh1 (forced), Qg2#
or:
24. Raa1, Bg2+
Kg1 (forced), Bf3#
or:
24. Bf3, Bxf1
now I think that White cannot defend, but maybe someone else can prove/disprove this position. 

May2809
  Aurora: I got 21...Rxg2 22.Kxg2 Qh3+ 23.Kh1 (23.Kg1 Bg4 ) f3! 

May2809   e fred: I was about to say, but gofer said it already: 22 Kxg2 Bf3+ seems to be the best choice. 

May2809   goodevans: I chose 21 ... Rxg2 22 Kxg2 Bh3+, which according to <gofer> is <quicker and cleaner> than 22 ... Qh3+. It was intuitive to me to bring the other rook into the attack ASAP. My analysis was the same as his except that 23 Kh1 Rg8 <24 Bg4 f3> came as some surprise. I'd dismissed 24 Bg4 as a serious consideration because of the simple 24 ... Rxg4. Was this an oversight on my behalf? Got to go now  lunch break over. But I'll check back later to see if there's an answer to my question. 

May2809   Lamine: 21 ... ♖xg2 seemed a reasonable try.
22 ♔xg2 ♗h3+! (opening up the back rank for the ♖ to approach so all pieces can attack further soon). There are now three options for white: A 23 ♔f3 ♕g4#
B 23 ♔g1 ♖g8+ 24 ♔h1 ♗g2+ 25 ♔g1 ♗f3#
C 23 ♔h1 ♖g8 24 ♗f3 ( 24 f3 ♗g2+ 25 ♔g1 ♗xf3#) 24 ... ♕g5 with ♗g2+ and mate to follow 

May2809
  gawain: I managed to see my way through this one starting with the Rook sac on g2 and all the variations after 21...Bh3+ Easier than some Thursdays. <johnlspouge> said it all. 

May2809   geeker: I got this pretty quickly on general principles. 21...Rg2 is fairly obvious, then 22...Bh3 seems necessary in order to activate the Ra8.
Must be an easy week, I'm 4:4 so far...probably will be stymied the next three days. 

May2809
  PinnedPiece: Took about two minutes for me to confirm the line Rxg2, Bh3 etc. as winning. This is unheard of for me on a Thursday. For some reason CG.COM is using up their Monday storehouse of puzzles this week. . 

May2809   WhiteRook48: actually got it right 


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