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|Jan-17-18|| ||wtpy: This took me too long to solve. I spent a lot of time on Ra5 24 Qa5 Bg4 which mates in 11 per Olga, but can't be the solution to a wednesday problem. So I put the puzzle down, watched the final flurries of snow (no work tomorrow-- snow day in south La!) returned to the puzzle and found Bd3.|
|Jan-17-18|| ||Steve.Patzer: Phony, after 26. Kg1 Qxa1+ will result in checkmate.|
|Jan-17-18|| ||wtpy: Saturn,That was my other wrong path. I think the answer is he can. Possible line 23..Ra8 24 Re1. Black guards his back rank with h5 and then probably after 25 Qd5 snaps up the knight and should win easily. This wasn't a likely Wednesday solution either.|
|Jan-17-18|| ||Sastre: <saturn2: How does white save the knight after 23..Rea8?> 24.b4 cxb4 25.Nb3.|
|Jan-17-18|| ||roentgenium: I completely missed 25...Bd3! and hence erroneously thought the solution to today's puzzle was 23...Qa6, attempting to hit the trapped Knight and threaten Re2+. But unfortunately, Black's back rank issues arise in this flawed line, as 24.Re1 is an effective parry.|
Perhaps the theme of this week's puzzles is succeeding despite an apparent King weakness?
|Jan-17-18|| ||clement41: Nice win!
One has to see 25...Bd3! when launching the exchange sac, a move which is reminiscent in the concept of a certain Fischer-Sherwin game (Qf1!!)
|Jan-17-18|| ||Geronimo: Like <Mayankk> said, this one gets trickier the further you look into covering all the forcing moves. Intuitive, yes, but I got it with a guess without doing the hard calculations that would inspire confidence in a real life setting. Nice puzzle, CG.|
|Jan-17-18|| ||cocker: Fritz claims that 24 ... Bg4 is stronger than the move played.|
|Jan-17-18|| ||morfishine: <23...Rxa5>|
|Jan-17-18|| ||mel gibson: It's all about deflecting the White Queen.
Stockfish 8 says:
23. Kg2 Rxa5 (23. .. Rxa5 (♖a7xa5 ♖h1-e1
♖a5-a8 ♕d2xd5 ♗f5xc2 ♖e1xe8+ ♖a8xe8 ♖a1-e1 ♖e8-d8 ♖e1-e2 ♕f6-f8 ♕d5-e6
♗c2-d1 ♖e2-e3 c5-c4 b3xc4 ♗d1xa4 ♕e6-e5 ♕f8-f7 ♕e5-e6 ♖d8-d2+ ♔g2-g1 ♕f7-f8
♕e6-e7 ♕f8-b8 ♖e3-e2 ♖d2-d8 ♖e2-e3 ♗a4-c6 ♔g1-g2 ♖d8-d2+ ♖e3-e2 ♖d2-d4
♖e2-f2 ♖d4-d3 ♕e7-e6 ♖d3-d6 ♕e6-f5 ♖d6-f6 ♕f5-d3 ♕b8-c8 h2-h3 ♖f6-d6 ♕d3-e3
♕c8-d8 ♕e3-c5) +3.51/34 77)
score for Black +3.51 depth 34.
When White resigns:
26. Qa8+ (♕a5-a8+
♖e2-e8+ ♔f1-g2 ♖e8xa8 c2xd3 ♕f6-b2+ ♔g2-h3 ♕b2xb3 ♖a1-d1 ♕b3xa4 ♖d1-d2
♕a4-d4 ♖h1-d1 ♕d4-e3 ♔h3-g2 ♖a8-a3 ♔g2-f1 ♔h8-g8 ♖d2-f2 ♖a3xd3 ♖d1-e1
♕e3-d4 ♖e1-e8+ ♔g8-f7 ♖f2-e2 ♖d3xf3+ ♔f1-g2 ♖f3-f2+ ♖e2xf2+ ♔f7xe8 ♖f2-f4
♕d4-d3 g3-g4 ♕d3-e2+ ♔g2-g3 ♕e2-e5 ♔g3-f3 c5-c4 g4-g5 ♕e5xg5 ♖f4-g4 ♕g5-f5+
♖g4-f4 ♕f5-h3+ ♔f3-f2 ♕h3xh2+ ♔f2-f3 ♕h2-h3+ ♔f3-e2) -10.57/31 83
score for White -10.57 depth 31.
|Jan-17-18|| ||Dionysius1: Hi <cocker>. Yes, but I bet that's because it sees that the game can legally go on longer with 24...♖e2 25.♔f1 ♗d3 26.♕a8+ ♖e8+ 27.♔g2 ♖xa8.... But at that point a human player would resign. So in human terms the move Romanov played would end the game quicker, so it's stronger. I hadn't thought of that as a quirk of computer analysis before!|
|Jan-17-18|| ||gofer: Its only <Wednesday> and I am stumped! I can't see the combination that we are looking for
and my weak back rank is bugging me. So, as a last resort, I am going for a knight trap
that doesn't work, but wins two pawns instead. This should result in the pawn majority
on the queen side giving black a winning advantage, but it's really not what I would like
on a <Wednesday>!|
23 ... Rea8
24 b4 cxb4
25 Nb3 Rxa4
26 Rxa4 Rxa4 -+
|Jan-17-18|| ||malt: Deflection <23...R:a5> |
(24.Q:a5 Re2+ 25.Kf1 Bd3!26.Qa8+ Re8+)
(25.Kg1 Q:a1+ and #)
|Jan-17-18|| ||Cheapo by the Dozen: I went with a totally different line:
23 ... Qa6, threatening both Qxa5 and Re2+
24 Qxd5 (or Qg5) Bh3, with an unstoppable pair of mate threats in ... Qg2 and ... Qf3
However, I fear that 24 R(either)e1 would quite spoil my fun. :(
|Jan-17-18|| ||patzer2: In attempting to solve today's Wednesday puzzle, I first looked at 23...Rxa5!! 24. Qxa5 Re2+ 25. Kf1 (25.Kg1 Qd4+ 26. Kf1 Qf2#) 25...Ba3! -+.|
But then I decided to look for an alternative win where I didn't have to sacrifice of the exchange.
That's when I saw the tempting but flawed 25...Qa6? which, with the dual threats of 26...Qxa5 and 26...Re7+, appeared to win a piece without having to sacrifice the exchange. So I decided to go with 25...Qa6? (diagram below) as my solution.
click for larger view
However, I was mistaken because 25...Qa6? gives White the advantage after 25...Qa6? 26. Rhe1! Raa8 (not 26...Rxe1? 27. Rxe1 +-) 27. Qxd5 ⩲ to ± (+0.68 @ 37 ply, Stockfish 8).
P.S.: White's game takes a permanent turn for the worse with 15. exf5?! Nxd5 ⩱ (-0.35 @ 31 ply, Stockfish 8). Instead, 15. 0-0 fxe4 16. Rae1 = (+0.02 @ 30 ply, Stockfish 8) holds it level.
Early in the opening, I prefer the popular move 5. Be3 as in White's win in D Andreikin vs Carlsen, 2017.
|Jan-17-18|| ||agb2002: Black has a bishop for a knight and a pawn.
The knight doesn't have free squares. This suggests 23... Rea8 (23... Qa6, threatening Re2+ and Qxa5, is met with 24.Rhe1) 24.b4 cxb4 25.Nb3 Rxa4 but this seems to spoil Black's positional advantage.
Another option is 23... Rxa5 24.Qxa5 Re2+ 25.Kf1 (25.Kg1 Qd4+ 26.Kf1 Qf2#) 25... Bd3 (defends the rook, prevents a back rank mate and threatens mate in two; 25... Qxa1+ 26.Kxe2 Qxh1 loses to 27.Qa8+ and mate next):
A) 26.cxd3 Qxf3+ 27.Kg1 Qf(g)2# (or 27... Rg2#).
B) 26.f4 Rxc2+ 27.Ke1 (27.Kg1 Qd4#) 27... Qe6+ 28.Kd1 Qe2#.
C) 26.Qa8+ Re8+ 27.cxd3 Qxf3+ 28.Kg1 Rxa8 - + [q vs R].
|Jan-17-18|| ||Carlos0012358: <agb2002> about your C) line:|
27.Kg2 Rxa8 fairs better and extends white's life by preserving two white rooks
|Jan-17-18|| ||lzromeu: easy.
Weak white play
g3? ... lose k forking R
|Jan-17-18|| ||raju17: WHAT ABOUT 26 Qa*# White wins|
|Jan-17-18|| ||lion100: to raju17 Re8 gives check with the bishop on d3 and white loses the queen|
|Jan-17-18|| ||SpamIAm: <raju17> See above comments. If 26.Qa8+ black plays 26...Re8+. Discovered check while stopping white's check.|
|Jan-17-18|| ||njchess: The initial sequence was enough. 23. ... ♖xa5 24. ♕xa5 ♖e2+ 25. ♔f1 It took me a bit to find 25. ... ♗d3 letting Black's queen attack.|
|Jan-17-18|| ||penarol: Difficult for Wednesday|
|Jan-17-18|| ||chesst: now..that poor..girl...|
|Jan-18-18|| ||agb2002: <Carlos0012358: <agb2002> about your C) line:
27.Kg2 Rxa8 fairs better and extends white's life by preserving two white rooks>|
You're right, thank you! Kg2 is the kind of move I often overlook.
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