May-08-15
 | | offramp: Ian Rogers, here the name is also a sentence. |
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| May-08-15 | | dfcx: It does not look so hard.
25.Rxf5+ gxf5 26.Qxf5+ Kg8 27.Qg6+ Kf8 28.Bxh6 forces black to give up a piece
click for larger view
A. 28...Bxg5 29.Bxg5 (with Bh6+ next) Qxc2+ 30.Qxc2 Rxc2 31.Kxc2  B. 28...Bf6 29.gxf6, this is worse than A.
C. 28...Qxc2+ 29.Qxc2 Rxc2 30.Kxc2
White has two bishops plus two extra passed pawns against R+B, should be an easy win. |
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| May-08-15 | | Tiggler: <dfcx: It does not look so hard.
25.Rxf5+ gxf5 26.Qxf5+ Kg8 27.Qg6+ Kf8 28.Bxh6> I had the same variation up to this point. I think it might be better than the game continuation, in which 33.. Rg8 looks inferior to 33.. Rf8 or Re8. |
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May-08-15
 | | An Englishman: Good Evening: Is the best defense 25...Kg8? However, even then White has a powerful attack. |
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| May-08-15 | | diagonalley: wow! white has a powerful attack, but is already a rook down... can he offer a further exchange sacrifice and be sure of victory(?)... i'm not convinced... it would be be interesting to see how an engine would defend 25.RxB |
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| May-08-15 | | patzer2: Today's Friday puzzle solution 25. Rxf5! is a continuation of a demolition combination begun earlier with 23. Rxf7!! The only realistic alternative is 25. Bxh5!?, which was my failed solution. It almost works, but Fritz indicates 25. Bxh5!? leads to a draw by repetition after 25....Kg8! 26. Rxf5 gxh5 27. Qe4! Qd7! 28. Rf7 Kxf7 29. Qh7+ Ke8 30. Qxh5+ Kf8 31. Qh8+ Kf7 32. Qh7+ Ke8 33. Qh5+ Kf8 34. Qh8+ Kf7 35. Qh7+ Ke8 36. Qh5+ =. The follow-up to the game continuation 25. Rxf5! shows White winning by exchanges which simplify to a Queen versus two Rooks middle game, with White having a decisive pawn majority. P.S.: For an improvement, perhaps the Fritz suggestion 13...Bd7!  instead of 13...e5?! would have given Black a good game. |
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| May-08-15 | | agb2002: White has a pawn for a rook.
Black threatens 25... Bxd3.
The first idea that comes to mind is 25.Rxf5+:
A) 25... gxf5 26.Qxf5+
A.1) 26... Ke8 27.Bxh5#.
A.2) 26... Kg7 27.Bd4+ Bf6 (27... Kg8 28.Qg6+ Kf8 29.Bg7+ Kg8 30.Bh6+ Kh8 31.Qg7#) 28.Qxf6+ Kg8 (28... Kh7 29.g6+ and mate next) 29.Qh8+ Kf7 30.Bxh5+ Ke7 31.Qg7#. A.3) 26... Kg8 27.Qg6+ Kf8 (27... Kh8 28.Bd4+ and mate in two) 28.Bxh5 A.3.a) 28... Bxg5 29.Bxg5 Rd7 (29... Re8 30.Bh6+ Ke7 31.Qf7+ Kd8 32.Qxe8#; 29... Qxc2+ 30.Qxc2 Rxc2 31.Rxc2 + - [2B+P vs R]) 30.Bh6+ Rg7 (30... Ke7 31.Qf7+ Kd8 32.Qe8#) 31.Bxg7+ Qxg7 32.Qf5+ Ke7 (32... Kg8 33.Qxc8+ Kh7 34.Qf5+ + - [B+2P]) 33.Qe6+ Kd8 34.Qxd6+ Qd7 35.Qxd7+ Kxd7 36.Bg4+ followed by 37.Bxc8 + - [2P]. A.3.b) 28... Bf6 29.gxf6 Qxc2+ (due to 30.Bh6+) 30.Qxc2 Rxc2 31.Kxc2 + - [2B+2P vs R]. A.3.c) 28... Qxc2+ 29.Qxc2 Rxc2 30.Kxc2 with two linked passed pawns for the exchange and very likely a won ending. A.4) 26... Bf6 27.Bxh5+
A.4.a) 27... Ke7 28.Qxf6+ Kd7 29.Qf7#.
A.4.b) 27... Kg7 28.gxf6+ with a winning attack. For example, 28... Kh8 29.f7 Qxc2+ (29... Qc4 30.Qf6+ and mate in two) 30.Qxc2 as in A.3.b. A.4.c) 27... Kf(g,h)8 28.gxf6 looks similar to A.4.b. B) 25... Ke8 26.Rf1 and the threat Qxg6+ looks winning. C) 25... Kg7 26.Bd4+ Bf6 (26... Kg8 27.Rf1 Kh7 28.Rf7+ Kg8 29.Qxg6#) 27.Rxf6 wins. D) 25... Kg8 26.Rf1 Kg7 (26... Kh7 27.Rf7+ and mate in three) 27.Bd4+ as in C. |
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| May-08-15 | | gofer: White is a whole rook down, so whatever he does it needs to
be pretty decisive. I think the obvious move is the way to
go...
<25 Rxf5+ ...>
25 ... Kg7/Kg8/Ke8
26 Rf1
<25 ... gxf5>
<26 Qxf5+ ...>
26 ... Ke8
27 Bxh5#
27 ... Kg7
28 Bd4+ Kg8
29 Qg6+ Kf8
30 Bg7+ Kg8
31 Bh6+ Kh8
32 Qg7#
<26 ... Kg8>
<27 Qe6+ Kf8>
<28 Bd3 >
click for larger view~~~
Hmmm, okay, but I didn't get the next 5 moves... |
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| May-08-15 | | morfishine: I had <25.Rxf5+> forcing 25...gxf5 26.Qxf5+ Kg7 But here <27.Bd3> whereas Rogers continued checking 27.Qe6+; I was too concerned with <c2> *****
<patzer2> Interesting try 25.Bxh5 ***** |
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May-08-15
 | | Penguincw: I saw 25.Rxf5+ gxf5 26.Qxf5+. I also knew that black <wouldn't> play 26...Ke8, due to 27.Bxh5# 1-0. Now looking at the puzzle a little deeper, 26...Bf6 and 26...Kg8 are also not great responses. |
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| May-08-15 | | Errrrrrr: White's initial sacrifice on ve 23. Rf7 appears to have been a bit unsound. Although the knee jerk response...Kf7 loses, black has instead 23...Qc7+. I wonder what the silicon beastie thinks... |
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| May-08-15 | | thegoodanarchist: <offramp: Ian Rogers, here the name is also a sentence.> Roger that. |
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| May-08-15 | | patzer2: In the final position, the possibility <35...Rxd5?> illustrates the power of the Queen Fork ( a powerful kind of double attack) tactic against two uncoordinated Rooks. Following 35...Rxd5?, White either mates or wins the Rook on d5 with a Queen fork <36. Qe3+!> (diagram below) 
click for larger view<36...Kg7>
If 36...Kg6 or 36...Kh7, then the Queen fork 37. Qe4+ picks off the Rook on d4. Of course Blocking the check with the Rook is not possible, due to the threat of capture by the pawn on h4 (e.g. 36...Rdg5? 37. hxg5 ). <37. Qe7+ Kh8> (diagram below) 
click for larger viewIf 37...Kg6, then 38. Qe4+ .
If 37...Kh6, then 38. Qe6+ .
<38. Qf6+!> (diagram below) 
click for larger view<38...Rg7>
If 38...Kh7, then 39. Qf7+ .
<39. Qh6+!> (diagram below) 
click for larger view<39...Kg8>
If 39...Rh7??, then 40. Qf8#
<40. Qe6+> (diagram below) 
click for larger viewNow White has a decisive Queen fork with <41. Qxd5 > to follow. P.S.: With apologies to our much stronger regulars here, this post is aimed more at novice level players, just starting to learn middle game tactics, like my Grandchildren. |
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| May-08-15 | | kevin86: The sac looks good as the queen and bishops take over. Finally, a queen can surely beat two disconnected rooks with the queen holding THREE extra pawns. |
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May-08-15
 | | Jimfromprovidence: I really liked 28 Bd3.
click for larger view It prevents the mate threat beginning with 28...Qxc2+ and allows white to eventually check with the bishop on h7 and win back his sacrificed material along with a couple of pawns. It's a useful exercise to contrast that move against both 28 Qh6+ and 28 c3. |
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| May-08-15 | | patzer2: Correction to my analysis of the possibility 35...Rxf5? above: After 35..Rxf5? 36. Qe6+ Kg6, the simplest win is the Queen fork 37. Qe6+ which wins a loose Rook after 38. Rxd4. The same goes for 35...Rxf5? 36. Qe3+ Kg7 37. Qe7+ Kg6, when the Queen fork 38. Qe6+ picks off the unprotected Rook on d4. |
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May-08-15
 | | scormus: I thought this was remarkably easy for Friday ...... until I realised W was almost an R down. Moral: count the material before rushing to judgement. OK, the first few moves are easy enough to find, but profiting from the position needs a bit more thought. |
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| May-08-15 | | stst: Two main lines, (I) Rxf5+, (II) Bxh5 - BUT REMEMBER THE BLACK KILL OF Qxc2... Looks like Rxf5+ impounds some momentum the get go.... so give it a shot (I)
25.Rxf5+ gxf5 (variations begins if Black let got this R)
26.Qxf5... then some complications
IF (A)
26.......Kg8
27.Qe6+ If (i) Kh8, 28.Bd4+ Kh7 (if Bf6, BxB+)
29.Bd3
If (ii)Kh7
28.Bd3+ Kg7
29.Bd4+ Kf8
30.Qh6+ Ke8
31.Qh8+ Kf7
32.Qg7+ Ke8
33.Bg6+ Kd7
34.Qf7 and Qe6# next
IF (B) .... Kg7
27.Bd4+ Kg8
(If Bf6.... 28.Qxf6+ Kg8 and 29.g6.. etc)
28.Qg6+ (guarding c2 as well) Kf8
29.Bg7+ Kg8
30.Bf6 dis+ Kh8
31.Qg7#
For (II), the lines got some legs as well...
(II)
25.Bxh5
IF (C) 25.....gxh5
26.g6+ Kxg6
27.Qxf5+ Kg7
28.Rg1+ Kh8
29.Bd4+ Bf6
30.Bxf6#
But if Black ignores the capture of h5P,
IF (D)
25..........Kg8 (Kg7 invites Bd4+)
then the B @ f6 needs to be removed, as it is pointing to the Q
26.Rxf6 gxf6
To keep the momentum and not letting a Q exchange by Black's Qxc2, have to deliver a check too
27.Bf7+ Kxf7
28.Qf5+ Kg8
29.c3 (disallow Qxc2) Bxg5
30.Qxg5+ .... but White's forces will be greatly reduced... insufficient even to stand the counter by Black, as now the Black Q is open to defend... Time to check.... |
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| May-08-15 | | Tiggler: <slim man pick an fat chance f7 at wash over get now an be effaces off at 32...Kxh6 33.Qxb7 point in front again rich am really b7 soon to be an extra and i vet plug has two passers advantage> <chrisowen> What do you think about 33.. Rg8? Do you agree that .. Rf8 or Re8 would have offered more resistance? |
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| May-08-15 | | Cheapo by the Dozen: I was looking at Bxh5 lines rather than Bd3. ... Bxg5 seemed to slow the attack. |
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| May-08-15 | | Tiggler: <Cheapo> I concur. Is 27 Qe6+ Kf8 28 Bd3 better than 27 Qg6+ Kf8 28 Bxh5 ? I don't think so. |
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Kibitzing
sac: 23.Rxf7